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boot: Add bootloader

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*.o
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*.hex

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OBJECTIVE DEVELOPMENT GmbH's V-USB driver software is distributed under the
terms and conditions of the GNU GPL version 2 or the GNU GPL version 3. It is
your choice whether you apply the terms of version 2 or version 3. The full
text of GPLv2 is included below. In addition to the requirements in the GPL,
we STRONGLY ENCOURAGE you to do the following:
(1) Publish your entire project on a web site and drop us a note with the URL.
Use the form at http://www.obdev.at/vusb/feedback.html for your submission.
(2) Adhere to minimum publication standards. Please include AT LEAST:
- a circuit diagram in PDF, PNG or GIF format
- full source code for the host software
- a Readme.txt file in ASCII format which describes the purpose of the
project and what can be found in which directories and which files
- a reference to http://www.obdev.at/vusb/
(3) If you improve the driver firmware itself, please give us a free license
to your modifications for our commercial license offerings.
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
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# Name: Makefile
# Project: USBaspLoader
# Author: Christian Starkjohann
# Creation Date: 2007-12-10
# Tabsize: 4
# Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
# License: GNU GPL v2 (see License.txt)
# This Revision: $Id$
###############################################################################
# Configure the following variables according to your AVR.
# Program the device with
# make fuse # to set the clock generator, boot section size etc.
# make flash # to load the boot loader into flash
# make lock # to protect the boot loader from overwriting
F_CPU = 16000000
DEVICE = atmega8
# BOOTLOADER_ADDRESS is 1800 for 8k devices, 3800 for 16k and 7800 for 32k.
BOOTLOADER_ADDRESS = 1800
FUSEOPT = $(FUSEOPT_8)
LOCKOPT = -U lock:w:0x2f:m
PROGRAMMER = -c usbasp
# PROGRAMMER contains AVRDUDE options to address your programmer
FUSEOPT_8 = -U lfuse:w:0xbf:m -U hfuse:w:0xc0:m
FUSEOPT_88 = -U hfuse:w:0xd6:m -U lfuse:w:0xdf:m -U efuse:w:0x00:m
FUSEOPT_168 = -U hfuse:w:0xd6:m -U lfuse:w:0xdf:m -U efuse:w:0x00:m
FUSEOPT_328 = -U lfuse:w:0xf7:m -U hfuse:w:0xda:m -U efuse:w:0x03:m
# You may have to change the order of these -U commands.
#---------------------------------------------------------------------
# ATMega8
#---------------------------------------------------------------------
# Fuse high byte:
# 0xc0 = 1 1 0 0 0 0 0 0 <-- BOOTRST (boot reset vector at 0x1800)
# ^ ^ ^ ^ ^ ^ ^------ BOOTSZ0
# | | | | | +-------- BOOTSZ1
# | | | | + --------- EESAVE (preserve EEPROM over chip erase)
# | | | +-------------- CKOPT (full output swing)
# | | +---------------- SPIEN (allow serial programming)
# | +------------------ WDTON (WDT not always on)
# +-------------------- RSTDISBL (reset pin is enabled)
# Fuse low byte:
# 0x9f = 1 0 0 1 1 1 1 1
# ^ ^ \ / \--+--/
# | | | +------- CKSEL 3..0 (external >8M crystal)
# | | +--------------- SUT 1..0 (crystal osc, BOD enabled)
# | +------------------ BODEN (BrownOut Detector enabled)
# +-------------------- BODLEVEL (2.7V)
#---------------------------------------------------------------------
# ATMega88, ATMega168
#---------------------------------------------------------------------
# Fuse extended byte:
# 0x00 = 0 0 0 0 0 0 0 0 <-- BOOTRST (boot reset vector at 0x1800)
# \+/
# +------- BOOTSZ (00 = 2k bytes)
# Fuse high byte:
# 0xd6 = 1 1 0 1 0 1 1 0
# ^ ^ ^ ^ ^ \-+-/
# | | | | | +------ BODLEVEL 0..2 (110 = 1.8 V)
# | | | | + --------- EESAVE (preserve EEPROM over chip erase)
# | | | +-------------- WDTON (if 0: watchdog always on)
# | | +---------------- SPIEN (allow serial programming)
# | +------------------ DWEN (debug wire enable)
# +-------------------- RSTDISBL (reset pin is enabled)
# Fuse low byte:
# 0xdf = 1 1 0 1 1 1 1 1
# ^ ^ \ / \--+--/
# | | | +------- CKSEL 3..0 (external >8M crystal)
# | | +--------------- SUT 1..0 (crystal osc, BOD enabled)
# | +------------------ CKOUT (if 0: Clock output enabled)
# +-------------------- CKDIV8 (if 0: divide by 8)
#---------------------------------------------------------------------
# ATMega328P
#---------------------------------------------------------------------
# Fuse extended byte:
# 0x03 = - - - - - 0 1 1
# \-+-/
# +------ BODLEVEL 0..2 (011 = 4.3V)
# Fuse high byte:
# 0xda = 1 1 0 1 1 0 1 0 <-- BOOTRST (0 = jump to bootloader at start)
# ^ ^ ^ ^ ^ \+/
# | | | | | +------- BOOTSZ 0..1 (01 = 2KB starting at 0x7800)
# | | | | + --------- EESAVE (don't preserve EEPROM over chip erase)
# | | | +-------------- WDTON (1 = watchdog disabled at start)
# | | +---------------- SPIEN (0 = allow serial programming)
# | +------------------ DWEN (1 = debug wire disable)
# +-------------------- RSTDISBL (1 = reset pin is enabled)
# Fuse low byte:
# 0xf7 = 1 1 1 1 0 1 1 1
# ^ ^ \ / \--+--/
# | | | +------- CKSEL 3..0 (0111 = external full-swing crystal)
# | | +--------------- SUT 1..0 (11 = startup time 16K CK/14K + 65ms)
# | +------------------ CKOUT (1 = clock output disabled)
# +-------------------- CKDIV8 (1 = do not divide clock by 8)
###############################################################################
# Tools:
AVRDUDE = avrdude $(PROGRAMMER) -p $(DEVICE)
CC = avr-gcc
# Options:
DEFINES = #-DDEBUG_LEVEL=2
# Remove the -fno-* options when you use gcc 3, it does not understand them
CFLAGS = -Wall -Os -fno-move-loop-invariants -fno-tree-scev-cprop -fno-inline-small-functions -I. -mmcu=$(DEVICE) -DF_CPU=$(F_CPU) $(DEFINES)
LDFLAGS = -Wl,--relax,--gc-sections -Wl,--section-start=.text=$(BOOTLOADER_ADDRESS)
OBJECTS = usbdrv/usbdrvasm.o usbdrv/oddebug.o main.o
# symbolic targets:
all: main.hex
.c.o:
$(CC) $(CFLAGS) -c $< -o $@
.S.o:
$(CC) $(CFLAGS) -x assembler-with-cpp -c $< -o $@
# "-x assembler-with-cpp" should not be necessary since this is the default
# file type for the .S (with capital S) extension. However, upper case
# characters are not always preserved on Windows. To ensure WinAVR
# compatibility define the file type manually.
.c.s:
$(CC) $(CFLAGS) -S $< -o $@
flash: all
$(AVRDUDE) -U flash:w:main.hex:i
readflash:
$(AVRDUDE) -U flash:r:read.hex:i
fuse:
$(AVRDUDE) $(FUSEOPT)
lock:
$(AVRDUDE) $(LOCKOPT)
read_fuses:
$(UISP) --rd_fuses
clean:
rm -f main.hex main.bin *.o usbdrv/*.o main.s usbdrv/oddebug.s usbdrv/usbdrv.s
# file targets:
main.bin: $(OBJECTS)
$(CC) $(CFLAGS) -o main.bin $(OBJECTS) $(LDFLAGS)
main.hex: main.bin
rm -f main.hex main.eep.hex
avr-objcopy -j .text -j .data -O ihex main.bin main.hex
avr-size main.hex
disasm: main.bin
avr-objdump -d main.bin
cpp:
$(CC) $(CFLAGS) -E main.c
# Special rules for generating hex files for various devices and clock speeds
ALLHEXFILES = hexfiles/mega8_12mhz.hex hexfiles/mega8_15mhz.hex hexfiles/mega8_16mhz.hex \
hexfiles/mega88_12mhz.hex hexfiles/mega88_15mhz.hex hexfiles/mega88_16mhz.hex hexfiles/mega88_20mhz.hex\
hexfiles/mega168_12mhz.hex hexfiles/mega168_15mhz.hex hexfiles/mega168_16mhz.hex hexfiles/mega168_20mhz.hex\
hexfiles/mega328p_12mhz.hex hexfiles/mega328p_15mhz.hex hexfiles/mega328p_16mhz.hex hexfiles/mega328p_20mhz.hex
allhexfiles: $(ALLHEXFILES)
$(MAKE) clean
avr-size hexfiles/*.hex
$(ALLHEXFILES):
@[ -d hexfiles ] || mkdir hexfiles
@device=`echo $@ | sed -e 's|.*/mega||g' -e 's|_.*||g'`; \
clock=`echo $@ | sed -e 's|.*_||g' -e 's|mhz.*||g'`; \
addr=`echo $$device | sed -e 's/\([0-9]\)8/\1/g' | awk '{printf("%x", ($$1 - 2) * 1024)}'`; \
echo "### Make with F_CPU=$${clock}000000 DEVICE=atmega$$device BOOTLOADER_ADDRESS=$$addr"; \
$(MAKE) clean; \
$(MAKE) main.hex F_CPU=$${clock}000000 DEVICE=atmega$$device BOOTLOADER_ADDRESS=$$addr DEFINES=-DUSE_AUTOCONFIG=1
mv main.hex $@

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/* Name: bootloaderconfig.h
* Project: USBaspLoader
* Author: Christian Starkjohann
* Creation Date: 2007-12-08
* Tabsize: 4
* Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt)
* This Revision: $Id$
*/
#ifndef __bootloaderconfig_h_included__
#define __bootloaderconfig_h_included__
/*
General Description:
This file (together with some settings in Makefile) configures the boot loader
according to the hardware.
This file contains (besides the hardware configuration normally found in
usbconfig.h) two functions or macros: bootLoaderInit() and
bootLoaderCondition(). Whether you implement them as macros or as static
inline functions is up to you, decide based on code size and convenience.
bootLoaderInit() is called as one of the first actions after reset. It should
be a minimum initialization of the hardware so that the boot loader condition
can be read. This will usually consist of activating a pull-up resistor for an
external jumper which selects boot loader mode.
bootLoaderCondition() is called immediately after initialization and in each
main loop iteration. If it returns TRUE, the boot loader will be active. If it
returns FALSE, the boot loader jumps to address 0 (the loaded application)
immediately.
For compatibility with Thomas Fischl's avrusbboot, we also support the macro
names BOOTLOADER_INIT and BOOTLOADER_CONDITION for this functionality. If
these macros are defined, the boot loader usees them.
*/
/* ---------------------------- Hardware Config ---------------------------- */
#define USB_CFG_IOPORTNAME D
/* This is the port where the USB bus is connected. When you configure it to
* "B", the registers PORTB, PINB and DDRB will be used.
*/
#define USB_CFG_DMINUS_BIT 4
/* This is the bit number in USB_CFG_IOPORT where the USB D- line is connected.
* This may be any bit in the port.
*/
#define USB_CFG_DPLUS_BIT 2
/* This is the bit number in USB_CFG_IOPORT where the USB D+ line is connected.
* This may be any bit in the port. Please note that D+ must also be connected
* to interrupt pin INT0!
*/
#define USB_CFG_CLOCK_KHZ (F_CPU/1000)
/* Clock rate of the AVR in MHz. Legal values are 12000, 16000 or 16500.
* The 16.5 MHz version of the code requires no crystal, it tolerates +/- 1%
* deviation from the nominal frequency. All other rates require a precision
* of 2000 ppm and thus a crystal!
* Default if not specified: 12 MHz
*/
/* ----------------------- Optional Hardware Config ------------------------ */
/* #define USB_CFG_PULLUP_IOPORTNAME D */
/* If you connect the 1.5k pullup resistor from D- to a port pin instead of
* V+, you can connect and disconnect the device from firmware by calling
* the macros usbDeviceConnect() and usbDeviceDisconnect() (see usbdrv.h).
* This constant defines the port on which the pullup resistor is connected.
*/
/* #define USB_CFG_PULLUP_BIT 4 */
/* This constant defines the bit number in USB_CFG_PULLUP_IOPORT (defined
* above) where the 1.5k pullup resistor is connected. See description
* above for details.
*/
/* ------------------------------------------------------------------------- */
/* ---------------------- feature / code size options ---------------------- */
/* ------------------------------------------------------------------------- */
#define HAVE_EEPROM_PAGED_ACCESS 1
/* If HAVE_EEPROM_PAGED_ACCESS is defined to 1, page mode access to EEPROM is
* compiled in. Whether page mode or byte mode access is used by AVRDUDE
* depends on the target device. Page mode is only used if the device supports
* it, e.g. for the ATMega88, 168 etc. You can save quite a bit of memory by
* disabling page mode EEPROM access. Costs ~ 138 bytes.
*/
#define HAVE_EEPROM_BYTE_ACCESS 1
/* If HAVE_EEPROM_BYTE_ACCESS is defined to 1, byte mode access to EEPROM is
* compiled in. Byte mode is only used if the device (as identified by its
* signature) does not support page mode for EEPROM. It is required for
* accessing the EEPROM on the ATMega8. Costs ~54 bytes.
*/
#define BOOTLOADER_CAN_EXIT 1
/* If this macro is defined to 1, the boot loader will exit shortly after the
* programmer closes the connection to the device. Costs ~36 bytes.
*/
#define HAVE_CHIP_ERASE 0
/* If this macro is defined to 1, the boot loader implements the Chip Erase
* ISP command. Otherwise pages are erased on demand before they are written.
*/
//#define SIGNATURE_BYTES 0x1e, 0x93, 0x07, 0 /* ATMega8 */
/* This macro defines the signature bytes returned by the emulated USBasp to
* the programmer software. They should match the actual device at least in
* memory size and features. If you don't define this, values for ATMega8,
* ATMega88, ATMega168 and ATMega328 are guessed correctly.
*/
/* The following block guesses feature options so that the resulting code
* should fit into 2k bytes boot block with the given device and clock rate.
* Activate by passing "-DUSE_AUTOCONFIG=1" to the compiler.
* This requires gcc 3.4.6 for small enough code size!
*/
#if USE_AUTOCONFIG
# undef HAVE_EEPROM_PAGED_ACCESS
# define HAVE_EEPROM_PAGED_ACCESS (USB_CFG_CLOCK_KHZ != 15000)
# undef HAVE_EEPROM_BYTE_ACCESS
# define HAVE_EEPROM_BYTE_ACCESS 1
# undef BOOTLOADER_CAN_EXIT
# define BOOTLOADER_CAN_EXIT 1
# undef SIGNATURE_BYTES
#endif /* USE_AUTOCONFIG */
/* ------------------------------------------------------------------------- */
/* Example configuration: Port D bit 3 is connected to a jumper which ties
* this pin to GND if the boot loader is requested. Initialization allows
* several clock cycles for the input voltage to stabilize before
* bootLoaderCondition() samples the value.
* We use a function for bootLoaderInit() for convenience and a macro for
* bootLoaderCondition() for efficiency.
*/
#ifndef __ASSEMBLER__ /* assembler cannot parse function definitions */
#define JUMPER_BIT 3 /* jumper is connected to this bit in port D, active low */
#ifndef MCUCSR /* compatibility between ATMega8 and ATMega88 */
# define MCUCSR MCUSR
#endif
static inline void bootLoaderInit(void)
{
PORTD |= (1 << JUMPER_BIT); /* activate pull-up */
//if(!(MCUCSR & (1 << EXTRF))) // If this was not an external reset, ignore
// leaveBootloader();
MCUCSR = 0; /* clear all reset flags for next time */
}
static inline void bootLoaderExit(void)
{
PORTD = 0; /* undo bootLoaderInit() changes */
}
#define bootLoaderCondition() ((PIND & (1 << JUMPER_BIT)) == 0)
#endif /* __ASSEMBLER__ */
/* ------------------------------------------------------------------------- */
#endif /* __bootloader_h_included__ */

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/* Name: main.c
* Project: USBaspLoader
* Author: Christian Starkjohann
* Creation Date: 2007-12-08
* Tabsize: 4
* Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt)
* This Revision: $Id$
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <avr/wdt.h>
#include <avr/boot.h>
#include <avr/eeprom.h>
#include <util/delay.h>
#include <string.h>
static void leaveBootloader() __attribute__((__noreturn__));
#include "bootloaderconfig.h"
#include "usbdrv/usbdrv.c"
/* ------------------------------------------------------------------------ */
/* Request constants used by USBasp */
#define USBASP_FUNC_CONNECT 1
#define USBASP_FUNC_DISCONNECT 2
#define USBASP_FUNC_TRANSMIT 3
#define USBASP_FUNC_READFLASH 4
#define USBASP_FUNC_ENABLEPROG 5
#define USBASP_FUNC_WRITEFLASH 6
#define USBASP_FUNC_READEEPROM 7
#define USBASP_FUNC_WRITEEEPROM 8
#define USBASP_FUNC_SETLONGADDRESS 9
/* ------------------------------------------------------------------------ */
#ifndef ulong
# define ulong unsigned long
#endif
#ifndef uint
# define uint unsigned int
#endif
/* defaults if not in config file: */
#ifndef HAVE_EEPROM_PAGED_ACCESS
# define HAVE_EEPROM_PAGED_ACCESS 0
#endif
#ifndef HAVE_EEPROM_BYTE_ACCESS
# define HAVE_EEPROM_BYTE_ACCESS 0
#endif
#ifndef BOOTLOADER_CAN_EXIT
# define BOOTLOADER_CAN_EXIT 0
#endif
/* allow compatibility with avrusbboot's bootloaderconfig.h: */
#ifdef BOOTLOADER_INIT
# define bootLoaderInit() BOOTLOADER_INIT
# define bootLoaderExit()
#endif
#ifdef BOOTLOADER_CONDITION
# define bootLoaderCondition() BOOTLOADER_CONDITION
#endif
/* device compatibility: */
#ifndef GICR /* ATMega*8 don't have GICR, use MCUCR instead */
# define GICR MCUCR
#endif
/* ------------------------------------------------------------------------ */
#if (FLASHEND) > 0xffff /* we need long addressing */
# define CURRENT_ADDRESS currentAddress.l
# define addr_t ulong
#else
# define CURRENT_ADDRESS currentAddress.w[0]
# define addr_t uint
#endif
typedef union longConverter{
addr_t l;
uint w[sizeof(addr_t)/2];
uchar b[sizeof(addr_t)];
}longConverter_t;
static uchar requestBootLoaderExit;
static longConverter_t currentAddress; /* in bytes */
static uchar bytesRemaining;
static uchar isLastPage;
#if HAVE_EEPROM_PAGED_ACCESS
static uchar currentRequest;
#else
static const uchar currentRequest = 0;
#endif
static const uchar signatureBytes[4] = {
#ifdef SIGNATURE_BYTES
SIGNATURE_BYTES
#elif defined (__AVR_ATmega8__) || defined (__AVR_ATmega8HVA__)
0x1e, 0x93, 0x07, 0
#elif defined (__AVR_ATmega48__) || defined (__AVR_ATmega48P__)
0x1e, 0x92, 0x05, 0
#elif defined (__AVR_ATmega88__) || defined (__AVR_ATmega88P__)
0x1e, 0x93, 0x0a, 0
#elif defined (__AVR_ATmega168__) || defined (__AVR_ATmega168P__)
0x1e, 0x94, 0x06, 0
#elif defined (__AVR_ATmega328P__)
0x1e, 0x95, 0x0f, 0
#else
# error "Device signature is not known, please edit main.c!"
#endif
};
/* ------------------------------------------------------------------------ */
static void (*nullVector)(void) __attribute__((__noreturn__));
static void leaveBootloader()
{
DBG1(0x01, 0, 0);
bootLoaderExit();
cli();
USB_INTR_ENABLE = 0;
USB_INTR_CFG = 0; /* also reset config bits */
GICR = (1 << IVCE); /* enable change of interrupt vectors */
GICR = (0 << IVSEL); /* move interrupts to application flash section */
/* We must go through a global function pointer variable instead of writing
* ((void (*)(void))0)();
* because the compiler optimizes a constant 0 to "rcall 0" which is not
* handled correctly by the assembler.
*/
nullVector();
}
/* ------------------------------------------------------------------------ */
uchar usbFunctionSetup(uchar data[8])
{
usbRequest_t *rq = (void *)data;
uchar len = 0;
static uchar replyBuffer[4];
usbMsgPtr = (usbMsgPtr_t)replyBuffer;
if(rq->bRequest == USBASP_FUNC_TRANSMIT){ /* emulate parts of ISP protocol */
uchar rval = 0;
usbWord_t address;
address.bytes[1] = rq->wValue.bytes[1];
address.bytes[0] = rq->wIndex.bytes[0];
if(rq->wValue.bytes[0] == 0x30){ /* read signature */
rval = rq->wIndex.bytes[0] & 3;
rval = signatureBytes[rval];
#if HAVE_EEPROM_BYTE_ACCESS
}else if(rq->wValue.bytes[0] == 0xa0){ /* read EEPROM byte */
rval = eeprom_read_byte((void *)address.word);
}else if(rq->wValue.bytes[0] == 0xc0){ /* write EEPROM byte */
eeprom_write_byte((void *)address.word, rq->wIndex.bytes[1]);
#endif
#if HAVE_CHIP_ERASE
}else if(rq->wValue.bytes[0] == 0xac && rq->wValue.bytes[1] == 0x80){ /* chip erase */
addr_t addr;
for(addr = 0; addr < FLASHEND + 1 - 2048; addr += SPM_PAGESIZE) {
/* wait and erase page */
DBG1(0x33, 0, 0);
# ifndef NO_FLASH_WRITE
boot_spm_busy_wait();
cli();
boot_page_erase(addr);
sei();
# endif
}
#endif
}else{
/* ignore all others, return default value == 0 */
}
replyBuffer[3] = rval;
len = 4;
}else if(rq->bRequest == USBASP_FUNC_ENABLEPROG){
/* replyBuffer[0] = 0; is never touched and thus always 0 which means success */
len = 1;
}else if(rq->bRequest >= USBASP_FUNC_READFLASH && rq->bRequest <= USBASP_FUNC_SETLONGADDRESS){
currentAddress.w[0] = rq->wValue.word;
if(rq->bRequest == USBASP_FUNC_SETLONGADDRESS){
#if (FLASHEND) > 0xffff
currentAddress.w[1] = rq->wIndex.word;
#endif
}else{
bytesRemaining = rq->wLength.bytes[0];
/* if(rq->bRequest == USBASP_FUNC_WRITEFLASH) only evaluated during writeFlash anyway */
isLastPage = rq->wIndex.bytes[1] & 0x02;
#if HAVE_EEPROM_PAGED_ACCESS
currentRequest = rq->bRequest;
#endif
len = 0xff; /* hand over to usbFunctionRead() / usbFunctionWrite() */
}
#if BOOTLOADER_CAN_EXIT
}else if(rq->bRequest == USBASP_FUNC_DISCONNECT){
requestBootLoaderExit = 1; /* allow proper shutdown/close of connection */
#endif
}else{
/* ignore: USBASP_FUNC_CONNECT */
}
return len;
}
uchar usbFunctionWrite(uchar *data, uchar len)
{
uchar isLast;
DBG1(0x31, (void *)&currentAddress.l, 4);
if(len > bytesRemaining)
len = bytesRemaining;
bytesRemaining -= len;
isLast = bytesRemaining == 0;
if(currentRequest >= USBASP_FUNC_READEEPROM){
uchar i;
for(i = 0; i < len; i++){
eeprom_write_byte((void *)(currentAddress.w[0]++), *data++);
}
}else{
uchar i;
for(i = 0; i < len;){
#if !HAVE_CHIP_ERASE
if((currentAddress.w[0] & (SPM_PAGESIZE - 1)) == 0){ /* if page start: erase */
DBG1(0x33, 0, 0);
# ifndef NO_FLASH_WRITE
cli();
boot_page_erase(CURRENT_ADDRESS); /* erase page */
sei();
boot_spm_busy_wait(); /* wait until page is erased */
# endif
}
#endif
i += 2;
DBG1(0x32, 0, 0);
cli();
boot_page_fill(CURRENT_ADDRESS, *(short *)data);
sei();
CURRENT_ADDRESS += 2;
data += 2;
/* write page when we cross page boundary or we have the last partial page */
if((currentAddress.w[0] & (SPM_PAGESIZE - 1)) == 0 || (isLast && i >= len && isLastPage)){
DBG1(0x34, 0, 0);
#ifndef NO_FLASH_WRITE
cli();
boot_page_write(CURRENT_ADDRESS - 2);
sei();
boot_spm_busy_wait();
cli();
boot_rww_enable();
sei();
#endif
}
}
DBG1(0x35, (void *)&currentAddress.l, 4);
}
return isLast;
}
uchar usbFunctionRead(uchar *data, uchar len)
{
uchar i;
if(len > bytesRemaining)
len = bytesRemaining;
bytesRemaining -= len;
for(i = 0; i < len; i++){
if(currentRequest >= USBASP_FUNC_READEEPROM){
*data = eeprom_read_byte((void *)currentAddress.w[0]);
}else{
*data = pgm_read_byte((void *)CURRENT_ADDRESS);
}
data++;
CURRENT_ADDRESS++;
}
return len;
}
/* ------------------------------------------------------------------------ */
static void initForUsbConnectivity(void)
{
uchar i = 0;
usbInit();
/* enforce USB re-enumerate: */
usbDeviceDisconnect(); /* do this while interrupts are disabled */
while(--i){ /* fake USB disconnect for > 250 ms */
wdt_reset();
_delay_ms(1);
}
usbDeviceConnect();
sei();
}
int __attribute__((noreturn)) main(void)
{
/* initialize */
wdt_disable(); /* main app may have enabled watchdog */
bootLoaderInit();
odDebugInit();
DBG1(0x00, 0, 0);
#ifndef NO_FLASH_WRITE
GICR = (1 << IVCE); /* enable change of interrupt vectors */
GICR = (1 << IVSEL); /* move interrupts to boot flash section */
#endif
if(bootLoaderCondition()){
uchar i = 0, j = 0;
initForUsbConnectivity();
do{
usbPoll();
#if BOOTLOADER_CAN_EXIT
if(requestBootLoaderExit){
if(--i == 0){
if(--j == 0)
break;
}
}
#endif
}while(bootLoaderCondition()); /* main event loop */
}
leaveBootloader();
}
/* ------------------------------------------------------------------------ */

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/* Name: usbconfig.h
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Christian Starkjohann
* Creation Date: 2005-04-01
* Tabsize: 4
* Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
* This Revision: $Id$
*/
#ifndef __usbconfig_h_included__
#define __usbconfig_h_included__
/* YOU SHOULD NOT NEED TO MODIFY THIS FILE! All configurations are supposed
* to go into bootloaderconfig.h!
*/
/* ---------------------------- Hardware Config ---------------------------- */
/* All the port and pin assignments, as well as the clock speed and CRC
setting are now in bootloaderconfig.h: */
#include "bootloaderconfig.h"
/* --------------------------- Functional Range ---------------------------- */
#define USB_CFG_HAVE_INTRIN_ENDPOINT 0
/* Define this to 1 if you want to compile a version with two endpoints: The
* default control endpoint 0 and an interrupt-in endpoint (any other endpoint
* number).
*/
#define USB_CFG_HAVE_INTRIN_ENDPOINT3 0
/* Define this to 1 if you want to compile a version with three endpoints: The
* default control endpoint 0, an interrupt-in endpoint 3 (or the number
* configured below) and a catch-all default interrupt-in endpoint as above.
* You must also define USB_CFG_HAVE_INTRIN_ENDPOINT to 1 for this feature.
*/
#define USB_CFG_EP3_NUMBER 3
/* If the so-called endpoint 3 is used, it can now be configured to any other
* endpoint number (except 0) with this macro. Default if undefined is 3.
*/
/* #define USB_INITIAL_DATATOKEN USBPID_DATA1 */
/* The above macro defines the startup condition for data toggling on the
* interrupt/bulk endpoints 1 and 3. Defaults to USBPID_DATA1.
* Since the token is toggled BEFORE sending any data, the first packet is
* sent with the oposite value of this configuration!
*/
#define USB_CFG_IMPLEMENT_HALT 0
/* Define this to 1 if you also want to implement the ENDPOINT_HALT feature
* for endpoint 1 (interrupt endpoint). Although you may not need this feature,
* it is required by the standard. We have made it a config option because it
* bloats the code considerably.
*/
#define USB_CFG_SUPPRESS_INTR_CODE 0
/* Define this to 1 if you want to declare interrupt-in endpoints, but don't
* want to send any data over them. If this macro is defined to 1, functions
* usbSetInterrupt() and usbSetInterrupt3() are omitted. This is useful if
* you need the interrupt-in endpoints in order to comply to an interface
* (e.g. HID), but never want to send any data. This option saves a couple
* of bytes in flash memory and the transmit buffers in RAM.
*/
#define USB_CFG_INTR_POLL_INTERVAL 10
/* If you compile a version with endpoint 1 (interrupt-in), this is the poll
* interval. The value is in milliseconds and must not be less than 10 ms for
* low speed devices.
*/
#ifndef USB_CFG_IS_SELF_POWERED // allow bootloaderconfig.h to override
#define USB_CFG_IS_SELF_POWERED 0
#endif
/* Define this to 1 if the device has its own power supply. Set it to 0 if the
* device is powered from the USB bus.
*/
#ifndef USB_CFG_MAX_BUS_POWER // allow bootloaderconfig.h to override
#define USB_CFG_MAX_BUS_POWER 100
#endif
/* Set this variable to the maximum USB bus power consumption of your device.
* The value is in milliamperes. [It will be divided by two since USB
* communicates power requirements in units of 2 mA.]
*/
#define USB_CFG_IMPLEMENT_FN_WRITE 1
/* Set this to 1 if you want usbFunctionWrite() to be called for control-out
* transfers. Set it to 0 if you don't need it and want to save a couple of
* bytes.
*/
#define USB_CFG_IMPLEMENT_FN_READ 1
/* Set this to 1 if you need to send control replies which are generated
* "on the fly" when usbFunctionRead() is called. If you only want to send
* data from a static buffer, set it to 0 and return the data from
* usbFunctionSetup(). This saves a couple of bytes.
*/
#define USB_CFG_IMPLEMENT_FN_WRITEOUT 0
/* Define this to 1 if you want to use interrupt-out (or bulk out) endpoints.
* You must implement the function usbFunctionWriteOut() which receives all
* interrupt/bulk data sent to any endpoint other than 0. The endpoint number
* can be found in 'usbRxToken'.
*/
#define USB_CFG_HAVE_FLOWCONTROL 0
/* Define this to 1 if you want flowcontrol over USB data. See the definition
* of the macros usbDisableAllRequests() and usbEnableAllRequests() in
* usbdrv.h.
*/
#define USB_CFG_DRIVER_FLASH_PAGE 0
/* If the device has more than 64 kBytes of flash, define this to the 64 k page
* where the driver's constants (descriptors) are located. Or in other words:
* Define this to 1 for boot loaders on the ATMega128.
*/
#define USB_CFG_LONG_TRANSFERS 0
/* Define this to 1 if you want to send/receive blocks of more than 254 bytes
* in a single control-in or control-out transfer. Note that the capability
* for long transfers increases the driver size.
*/
/* #define USB_RX_USER_HOOK(data, len) if(usbRxToken == (uchar)USBPID_SETUP) blinkLED(); */
/* This macro is a hook if you want to do unconventional things. If it is
* defined, it's inserted at the beginning of received message processing.
* If you eat the received message and don't want default processing to
* proceed, do a return after doing your things. One possible application
* (besides debugging) is to flash a status LED on each packet.
*/
/* #define USB_RESET_HOOK(resetStarts) if(!resetStarts){hadUsbReset();} */
/* This macro is a hook if you need to know when an USB RESET occurs. It has
* one parameter which distinguishes between the start of RESET state and its
* end.
*/
/* #define USB_SET_ADDRESS_HOOK() hadAddressAssigned(); */
/* This macro (if defined) is executed when a USB SET_ADDRESS request was
* received.
*/
#define USB_COUNT_SOF 0
/* define this macro to 1 if you need the global variable "usbSofCount" which
* counts SOF packets. This feature requires that the hardware interrupt is
* connected to D- instead of D+.
*/
/* #ifdef __ASSEMBLER__
* macro myAssemblerMacro
* in YL, TCNT0
* sts timer0Snapshot, YL
* endm
* #endif
* #define USB_SOF_HOOK myAssemblerMacro
* This macro (if defined) is executed in the assembler module when a
* Start Of Frame condition is detected. It is recommended to define it to
* the name of an assembler macro which is defined here as well so that more
* than one assembler instruction can be used. The macro may use the register
* YL and modify SREG. If it lasts longer than a couple of cycles, USB messages
* immediately after an SOF pulse may be lost and must be retried by the host.
* What can you do with this hook? Since the SOF signal occurs exactly every
* 1 ms (unless the host is in sleep mode), you can use it to tune OSCCAL in
* designs running on the internal RC oscillator.
* Please note that Start Of Frame detection works only if D- is wired to the
* interrupt, not D+. THIS IS DIFFERENT THAN MOST EXAMPLES!
*/
#define USB_CFG_CHECK_DATA_TOGGLING 0
/* define this macro to 1 if you want to filter out duplicate data packets
* sent by the host. Duplicates occur only as a consequence of communication
* errors, when the host does not receive an ACK. Please note that you need to
* implement the filtering yourself in usbFunctionWriteOut() and
* usbFunctionWrite(). Use the global usbCurrentDataToken and a static variable
* for each control- and out-endpoint to check for duplicate packets.
*/
#define USB_CFG_HAVE_MEASURE_FRAME_LENGTH 0
/* define this macro to 1 if you want the function usbMeasureFrameLength()
* compiled in. This function can be used to calibrate the AVR's RC oscillator.
*/
#define USB_USE_FAST_CRC 0
/* The assembler module has two implementations for the CRC algorithm. One is
* faster, the other is smaller. This CRC routine is only used for transmitted
* messages where timing is not critical. The faster routine needs 31 cycles
* per byte while the smaller one needs 61 to 69 cycles. The faster routine
* may be worth the 32 bytes bigger code size if you transmit lots of data and
* run the AVR close to its limit.
*/
/* -------------------------- Device Description --------------------------- */
#define USB_CFG_VENDOR_ID 0xc0, 0x16 /* = 0x16c0 = 5824 = voti.nl */
/* USB vendor ID for the device, low byte first. If you have registered your
* own Vendor ID, define it here. Otherwise you may use one of obdev's free
* shared VID/PID pairs. Be sure to read USB-IDs-for-free.txt for rules!
*/
#define USB_CFG_DEVICE_ID 0xdc, 0x05 /* = 0x05dc = 1500 */
/* This is the ID of the product, low byte first. It is interpreted in the
* scope of the vendor ID. If you have registered your own VID with usb.org
* or if you have licensed a PID from somebody else, define it here. Otherwise
* you may use one of obdev's free shared VID/PID pairs. See the file
* USB-IDs-for-free.txt for details!
*/
#define USB_CFG_DEVICE_VERSION 0x02, 0x01
/* Version number of the device: Minor number first, then major number.
*/
#define USB_CFG_VENDOR_NAME 'w','w','w','.','f','i','s','c','h','l','.','d','e'
#define USB_CFG_VENDOR_NAME_LEN 13
/* These two values define the vendor name returned by the USB device. The name
* must be given as a list of characters under single quotes. The characters
* are interpreted as Unicode (UTF-16) entities.
* If you don't want a vendor name string, undefine these macros.
* ALWAYS define a vendor name containing your Internet domain name if you use
* obdev's free shared VID/PID pair. See the file USB-IDs-for-free.txt for
* details.
*/
#define USB_CFG_DEVICE_NAME 'U', 'S', 'B', 'a', 's', 'p'
#define USB_CFG_DEVICE_NAME_LEN 6
/* Same as above for the device name. If you don't want a device name, undefine
* the macros. See the file USB-IDs-for-free.txt before you assign a name if
* you use a shared VID/PID.
*/
/*#define USB_CFG_SERIAL_NUMBER 'N', 'o', 'n', 'e' */
/*#define USB_CFG_SERIAL_NUMBER_LEN 0 */
/* Same as above for the serial number. If you don't want a serial number,
* undefine the macros.
* It may be useful to provide the serial number through other means than at
* compile time. See the section about descriptor properties below for how
* to fine tune control over USB descriptors such as the string descriptor
* for the serial number.
*/
#define USB_CFG_DEVICE_CLASS 0xff /* set to 0 if deferred to interface */
#define USB_CFG_DEVICE_SUBCLASS 0
/* See USB specification if you want to conform to an existing device class.
* Class 0xff is "vendor specific".
*/
#define USB_CFG_INTERFACE_CLASS 0 /* define class here if not at device level */
#define USB_CFG_INTERFACE_SUBCLASS 0
#define USB_CFG_INTERFACE_PROTOCOL 0
/* See USB specification if you want to conform to an existing device class or
* protocol. The following classes must be set at interface level:
* HID class is 3, no subclass and protocol required (but may be useful!)
* CDC class is 2, use subclass 2 and protocol 1 for ACM
*/
/* #define USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH 42 */
/* Define this to the length of the HID report descriptor, if you implement
* an HID device. Otherwise don't define it or define it to 0.
* If you use this define, you must add a PROGMEM character array named
* "usbHidReportDescriptor" to your code which contains the report descriptor.
* Don't forget to keep the array and this define in sync!
*/
#define USB_PUBLIC static
/* Use the define above if you #include usbdrv.c instead of linking against it.
* This technique saves a couple of bytes in flash memory.
*/
/* ------------------- Fine Control over USB Descriptors ------------------- */
/* If you don't want to use the driver's default USB descriptors, you can
* provide our own. These can be provided as (1) fixed length static data in
* flash memory, (2) fixed length static data in RAM or (3) dynamically at
* runtime in the function usbFunctionDescriptor(). See usbdrv.h for more
* information about this function.
* Descriptor handling is configured through the descriptor's properties. If
* no properties are defined or if they are 0, the default descriptor is used.
* Possible properties are:
* + USB_PROP_IS_DYNAMIC: The data for the descriptor should be fetched
* at runtime via usbFunctionDescriptor(). If the usbMsgPtr mechanism is
* used, the data is in FLASH by default. Add property USB_PROP_IS_RAM if
* you want RAM pointers.
* + USB_PROP_IS_RAM: The data returned by usbFunctionDescriptor() or found
* in static memory is in RAM, not in flash memory.
* + USB_PROP_LENGTH(len): If the data is in static memory (RAM or flash),
* the driver must know the descriptor's length. The descriptor itself is
* found at the address of a well known identifier (see below).
* List of static descriptor names (must be declared PROGMEM if in flash):
* char usbDescriptorDevice[];
* char usbDescriptorConfiguration[];
* char usbDescriptorHidReport[];
* char usbDescriptorString0[];
* int usbDescriptorStringVendor[];
* int usbDescriptorStringDevice[];
* int usbDescriptorStringSerialNumber[];
* Other descriptors can't be provided statically, they must be provided
* dynamically at runtime.
*
* Descriptor properties are or-ed or added together, e.g.:
* #define USB_CFG_DESCR_PROPS_DEVICE (USB_PROP_IS_RAM | USB_PROP_LENGTH(18))
*
* The following descriptors are defined:
* USB_CFG_DESCR_PROPS_DEVICE
* USB_CFG_DESCR_PROPS_CONFIGURATION
* USB_CFG_DESCR_PROPS_STRINGS
* USB_CFG_DESCR_PROPS_STRING_0
* USB_CFG_DESCR_PROPS_STRING_VENDOR
* USB_CFG_DESCR_PROPS_STRING_PRODUCT
* USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER
* USB_CFG_DESCR_PROPS_HID
* USB_CFG_DESCR_PROPS_HID_REPORT
* USB_CFG_DESCR_PROPS_UNKNOWN (for all descriptors not handled by the driver)
*
* Note about string descriptors: String descriptors are not just strings, they
* are Unicode strings prefixed with a 2 byte header. Example:
* int serialNumberDescriptor[] = {
* USB_STRING_DESCRIPTOR_HEADER(6),
* 'S', 'e', 'r', 'i', 'a', 'l'
* };
*/
#define USB_CFG_DESCR_PROPS_DEVICE 0
#define USB_CFG_DESCR_PROPS_CONFIGURATION 0
#define USB_CFG_DESCR_PROPS_STRINGS 0
#define USB_CFG_DESCR_PROPS_STRING_0 0
#define USB_CFG_DESCR_PROPS_STRING_VENDOR 0
#define USB_CFG_DESCR_PROPS_STRING_PRODUCT 0
#define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER 0
#define USB_CFG_DESCR_PROPS_HID 0
#define USB_CFG_DESCR_PROPS_HID_REPORT 0
#define USB_CFG_DESCR_PROPS_UNKNOWN 0
#define usbMsgPtr_t unsigned short // scalar type yields shortest code
/* ----------------------- Optional MCU Description ------------------------ */
/* The following configurations have working defaults in usbdrv.h. You
* usually don't need to set them explicitly. Only if you want to run
* the driver on a device which is not yet supported or with a compiler
* which is not fully supported (such as IAR C) or if you use a differnt
* interrupt than INT0, you may have to define some of these.
*/
/* #define USB_INTR_CFG MCUCR */
/* #define USB_INTR_CFG_SET ((1 << ISC00) | (1 << ISC01)) */
/* #define USB_INTR_CFG_CLR 0 */
/* #define USB_INTR_ENABLE GIMSK */
/* #define USB_INTR_ENABLE_BIT INT0 */
/* #define USB_INTR_PENDING GIFR */
/* #define USB_INTR_PENDING_BIT INTF0 */
/* #define USB_INTR_VECTOR INT0_vect */
#endif /* __usbconfig_h_included__ */

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This file documents changes in the firmware-only USB driver for atmel's AVR
microcontrollers. New entries are always appended to the end of the file.
Scroll down to the bottom to see the most recent changes.
2005-04-01:
- Implemented endpoint 1 as interrupt-in endpoint.
- Moved all configuration options to usbconfig.h which is not part of the
driver.
- Changed interface for usbVendorSetup().
- Fixed compatibility with ATMega8 device.
- Various minor optimizations.
2005-04-11:
- Changed interface to application: Use usbFunctionSetup(), usbFunctionRead()
and usbFunctionWrite() now. Added configuration options to choose which
of these functions to compile in.
- Assembler module delivers receive data non-inverted now.
- Made register and bit names compatible with more AVR devices.
2005-05-03:
- Allow address of usbRxBuf on any memory page as long as the buffer does
not cross 256 byte page boundaries.
- Better device compatibility: works with Mega88 now.
- Code optimization in debugging module.
- Documentation updates.
2006-01-02:
- Added (free) default Vendor- and Product-IDs bought from voti.nl.
- Added USBID-License.txt file which defines the rules for using the free
shared VID/PID pair.
- Added Readme.txt to the usbdrv directory which clarifies administrative
issues.
2006-01-25:
- Added "configured state" to become more standards compliant.
- Added "HALT" state for interrupt endpoint.
- Driver passes the "USB Command Verifier" test from usb.org now.
- Made "serial number" a configuration option.
- Minor optimizations, we now recommend compiler option "-Os" for best
results.
- Added a version number to usbdrv.h
2006-02-03:
- New configuration variable USB_BUFFER_SECTION for the memory section where
the USB rx buffer will go. This defaults to ".bss" if not defined. Since
this buffer MUST NOT cross 256 byte pages (not even touch a page at the
end), the user may want to pass a linker option similar to
"-Wl,--section-start=.mybuffer=0x800060".
- Provide structure for usbRequest_t.
- New defines for USB constants.
- Prepared for HID implementations.
- Increased data size limit for interrupt transfers to 8 bytes.
- New macro usbInterruptIsReady() to query interrupt buffer state.
2006-02-18:
- Ensure that the data token which is sent as an ack to an OUT transfer is
always zero sized. This fixes a bug where the host reports an error after
sending an out transfer to the device, although all data arrived at the
device.
- Updated docs in usbdrv.h to reflect changed API in usbFunctionWrite().
* Release 2006-02-20
- Give a compiler warning when compiling with debugging turned on.
- Added Oleg Semyonov's changes for IAR-cc compatibility.
- Added new (optional) functions usbDeviceConnect() and usbDeviceDisconnect()
(also thanks to Oleg!).
- Rearranged tests in usbPoll() to save a couple of instructions in the most
likely case that no actions are pending.
- We need a delay between the SET ADDRESS request until the new address
becomes active. This delay was handled in usbPoll() until now. Since the
spec says that the delay must not exceed 2ms, previous versions required
aggressive polling during the enumeration phase. We have now moved the
handling of the delay into the interrupt routine.
- We must not reply with NAK to a SETUP transaction. We can only achieve this
by making sure that the rx buffer is empty when SETUP tokens are expected.
We therefore don't pass zero sized data packets from the status phase of
a transfer to usbPoll(). This change MAY cause troubles if you rely on
receiving a less than 8 bytes long packet in usbFunctionWrite() to
identify the end of a transfer. usbFunctionWrite() will NEVER be called
with a zero length.
* Release 2006-03-14
- Improved IAR C support: tiny memory model, more devices
- Added template usbconfig.h file under the name usbconfig-prototype.h
* Release 2006-03-26
- Added provision for one more interrupt-in endpoint (endpoint 3).
- Added provision for one interrupt-out endpoint (endpoint 1).
- Added flowcontrol macros for USB.
- Added provision for custom configuration descriptor.
- Allow ANY two port bits for D+ and D-.
- Merged (optional) receive endpoint number into global usbRxToken variable.
- Use USB_CFG_IOPORTNAME instead of USB_CFG_IOPORT. We now construct the
variable name from the single port letter instead of computing the address
of related ports from the output-port address.
* Release 2006-06-26
- Updated documentation in usbdrv.h and usbconfig-prototype.h to reflect the
new features.
- Removed "#warning" directives because IAR does not understand them. Use
unused static variables instead to generate a warning.
- Do not include <avr/io.h> when compiling with IAR.
- Introduced USB_CFG_DESCR_PROPS_* in usbconfig.h to configure how each
USB descriptor should be handled. It is now possible to provide descriptor
data in Flash, RAM or dynamically at runtime.
- STALL is now a status in usbTxLen* instead of a message. We can now conform
to the spec and leave the stall status pending until it is cleared.
- Made usbTxPacketCnt1 and usbTxPacketCnt3 public. This allows the
application code to reset data toggling on interrupt pipes.
* Release 2006-07-18
- Added an #if !defined __ASSEMBLER__ to the warning in usbdrv.h. This fixes
an assembler error.
- usbDeviceDisconnect() takes pull-up resistor to high impedance now.
* Release 2007-02-01
- Merged in some code size improvements from usbtiny (thanks to Dick
Streefland for these optimizations!)
- Special alignment requirement for usbRxBuf not required any more. Thanks
again to Dick Streefland for this hint!
- Reverted to "#warning" instead of unused static variables -- new versions
of IAR CC should handle this directive.
- Changed Open Source license to GNU GPL v2 in order to make linking against
other free libraries easier. We no longer require publication of the
circuit diagrams, but we STRONGLY encourage it. If you improve the driver
itself, PLEASE grant us a royalty free license to your changes for our
commercial license.
* Release 2007-03-29
- New configuration option "USB_PUBLIC" in usbconfig.h.
- Set USB version number to 1.10 instead of 1.01.
- Code used USB_CFG_DESCR_PROPS_STRING_DEVICE and
USB_CFG_DESCR_PROPS_STRING_PRODUCT inconsistently. Changed all occurrences
to USB_CFG_DESCR_PROPS_STRING_PRODUCT.
- New assembler module for 16.5 MHz RC oscillator clock with PLL in receiver
code.
- New assembler module for 16 MHz crystal.
- usbdrvasm.S contains common code only, clock-specific parts have been moved
to usbdrvasm12.S, usbdrvasm16.S and usbdrvasm165.S respectively.
* Release 2007-06-25
- 16 MHz module: Do SE0 check in stuffed bits as well.
* Release 2007-07-07
- Define hi8(x) for IAR compiler to limit result to 8 bits. This is necessary
for negative values.
- Added 15 MHz module contributed by V. Bosch.
- Interrupt vector name can now be configured. This is useful if somebody
wants to use a different hardware interrupt than INT0.
* Release 2007-08-07
- Moved handleIn3 routine in usbdrvasm16.S so that relative jump range is
not exceeded.
- More config options: USB_RX_USER_HOOK(), USB_INITIAL_DATATOKEN,
USB_COUNT_SOF
- USB_INTR_PENDING can now be a memory address, not just I/O
* Release 2007-09-19
- Split out common parts of assembler modules into separate include file
- Made endpoint numbers configurable so that given interface definitions
can be matched. See USB_CFG_EP3_NUMBER in usbconfig-prototype.h.
- Store endpoint number for interrupt/bulk-out so that usbFunctionWriteOut()
can handle any number of endpoints.
- Define usbDeviceConnect() and usbDeviceDisconnect() even if no
USB_CFG_PULLUP_IOPORTNAME is defined. Directly set D+ and D- to 0 in this
case.
* Release 2007-12-01
- Optimize usbDeviceConnect() and usbDeviceDisconnect() for less code size
when USB_CFG_PULLUP_IOPORTNAME is not defined.
* Release 2007-12-13
- Renamed all include-only assembler modules from *.S to *.inc so that
people don't add them to their project sources.
- Distribute leap bits in tx loop more evenly for 16 MHz module.
- Use "macro" and "endm" instead of ".macro" and ".endm" for IAR
- Avoid compiler warnings for constant expr range by casting some values in
USB descriptors.
* Release 2008-01-21
- Fixed bug in 15 and 16 MHz module where the new address set with
SET_ADDRESS was already accepted at the next NAK or ACK we send, not at
the next data packet we send. This caused problems when the host polled
too fast. Thanks to Alexander Neumann for his help and patience debugging
this issue!
* Release 2008-02-05
- Fixed bug in 16.5 MHz module where a register was used in the interrupt
handler before it was pushed. This bug was introduced with version
2007-09-19 when common parts were moved to a separate file.
- Optimized CRC routine (thanks to Reimar Doeffinger).
* Release 2008-02-16
- Removed outdated IAR compatibility stuff (code sections).
- Added hook macros for USB_RESET_HOOK() and USB_SET_ADDRESS_HOOK().
- Added optional routine usbMeasureFrameLength() for calibration of the
internal RC oscillator.
* Release 2008-02-28
- USB_INITIAL_DATATOKEN defaults to USBPID_DATA1 now, which means that we
start with sending USBPID_DATA0.
- Changed defaults in usbconfig-prototype.h
- Added free USB VID/PID pair for MIDI class devices
- Restructured AVR-USB as separate package, not part of PowerSwitch any more.
* Release 2008-04-18
- Restructured usbdrv.c so that it is easier to read and understand.
- Better code optimization with gcc 4.
- If a second interrupt in endpoint is enabled, also add it to config
descriptor.
- Added config option for long transfers (above 254 bytes), see
USB_CFG_LONG_TRANSFERS in usbconfig.h.
- Added 20 MHz module contributed by Jeroen Benschop.
* Release 2008-05-13
- Fixed bug in libs-host/hiddata.c function usbhidGetReport(): length
was not incremented, pointer to length was incremented instead.
- Added code to command line tool(s) which claims an interface. This code
is disabled by default, but may be necessary on newer Linux kernels.
- Added usbconfig.h option "USB_CFG_CHECK_DATA_TOGGLING".
- New header "usbportability.h" prepares ports to other development
environments.
- Long transfers (above 254 bytes) did not work when usbFunctionRead() was
used to supply the data. Fixed this bug. [Thanks to Alexander Neumann!]
- In hiddata.c (example code for sending/receiving data over HID), use
USB_RECIP_DEVICE instead of USB_RECIP_INTERFACE for control transfers so
that we need not claim the interface.
- in usbPoll() loop 20 times polling for RESET state instead of 10 times.
This accounts for the higher clock rates we now support.
- Added a module for 12.8 MHz RC oscillator with PLL in receiver loop.
- Added hook to SOF code so that oscillator can be tuned to USB frame clock.
- Added timeout to waitForJ loop. Helps preventing unexpected hangs.
- Added example code for oscillator tuning to libs-device (thanks to
Henrik Haftmann for the idea to this routine).
- Implemented option USB_CFG_SUPPRESS_INTR_CODE.
* Release 2008-10-22
- Fixed libs-device/osctune.h: OSCCAL is memory address on ATMega88 and
similar, not offset of 0x20 needs to be added.
- Allow distribution under GPLv3 for those who have to link against other
code distributed under GPLv3.
* Release 2008-11-26
- Removed libusb-win32 dependency for hid-data example in Makefile.windows.
It was never required and confused many people.
- Added extern uchar usbRxToken to usbdrv.h.
- Integrated a module with CRC checks at 18 MHz by Lukas Schrittwieser.
* Release 2009-03-23
- Hid-mouse example used settings from hid-data example, fixed that.
- Renamed project to V-USB due to a trademark issue with Atmel(r).
- Changed CommercialLicense.txt and USBID-License.txt to make the
background of USB ID registration clearer.
* Release 2009-04-15
- Changed CommercialLicense.txt to reflect the new range of PIDs from
Jason Kotzin.
- Removed USBID-License.txt in favor of USB-IDs-for-free.txt and
USB-ID-FAQ.txt
- Fixed a bug in the 12.8 MHz module: End Of Packet decection was made in
the center between bit 0 and 1 of each byte. This is where the data lines
are expected to change and the sampled data may therefore be nonsense.
We therefore check EOP ONLY if bits 0 AND 1 have both been read as 0 on D-.
- Fixed a bitstuffing problem in the 16 MHz module: If bit 6 was stuffed,
the unstuffing code in the receiver routine was 1 cycle too long. If
multiple bytes had the unstuffing in bit 6, the error summed up until the
receiver was out of sync.
- Included option for faster CRC routine.
Thanks to Slawomir Fras (BoskiDialer) for this code!
- Updated bits in Configuration Descriptor's bmAttributes according to
USB 1.1 (in particular bit 7, it is a must-be-set bit now).
* Release 2009-08-22
- Moved first DBG1() after odDebugInit() in all examples.
- Use vector INT0_vect instead of SIG_INTERRUPT0 if defined. This makes
V-USB compatible with the new "p" suffix devices (e.g. ATMega328p).
- USB_CFG_CLOCK_KHZ setting is now required in usbconfig.h (no default any
more).
- New option USB_CFG_DRIVER_FLASH_PAGE allows boot loaders on devices with
more than 64 kB flash.
- Built-in configuration descriptor allows custom definition for second
endpoint now.
* Release 2010-07-15
- Fixed bug in usbDriverSetup() which prevented descriptor sizes above 255
bytes.
- Avoid a compiler warning for unused parameter in usbHandleResetHook() when
compiler option -Wextra is enabled.
- Fixed wrong hex value for some IDs in USB-IDs-for-free.txt.
- Keep a define for USBATTR_BUSPOWER, although the flag does not exist
in USB 1.1 any more. Set it to 0. This is for backward compatibility.
* Release 2012-01-09
- Define a separate (defined) type for usbMsgPtr so that projects using a
tiny memory model can define it to an 8 bit type in usbconfig.h. This
change also saves a couple of bytes when using a scalar 16 bit type.
- Inserted "const" keyword for all PROGMEM declarations because new GCC
requires it.
- Fixed problem with dependence of usbportability.h on usbconfig.h. This
problem occurred with IAR CC only.
- Prepared repository for github.com.
* Release 2012-12-06

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V-USB Driver Software License Agreement
Version 2012-07-09
THIS LICENSE AGREEMENT GRANTS YOU CERTAIN RIGHTS IN A SOFTWARE. YOU CAN
ENTER INTO THIS AGREEMENT AND ACQUIRE THE RIGHTS OUTLINED BELOW BY PAYING
THE AMOUNT ACCORDING TO SECTION 4 ("PAYMENT") TO OBJECTIVE DEVELOPMENT.
1 DEFINITIONS
1.1 "OBJECTIVE DEVELOPMENT" shall mean OBJECTIVE DEVELOPMENT Software GmbH,
Grosse Schiffgasse 1A/7, 1020 Wien, AUSTRIA.
1.2 "You" shall mean the Licensee.
1.3 "V-USB" shall mean all files included in the package distributed under
the name "vusb" by OBJECTIVE DEVELOPMENT (http://www.obdev.at/vusb/)
unless otherwise noted. This includes the firmware-only USB device
implementation for Atmel AVR microcontrollers, some simple device examples
and host side software examples and libraries.
2 LICENSE GRANTS
2.1 Source Code. OBJECTIVE DEVELOPMENT shall furnish you with the source
code of V-USB.
2.2 Distribution and Use. OBJECTIVE DEVELOPMENT grants you the
non-exclusive right to use, copy and distribute V-USB with your hardware
product(s), restricted by the limitations in section 3 below.
2.3 Modifications. OBJECTIVE DEVELOPMENT grants you the right to modify
the source code and your copy of V-USB according to your needs.
2.4 USB IDs. OBJECTIVE DEVELOPMENT furnishes you with one or two USB
Product ID(s), sent to you in e-mail. These Product IDs are reserved
exclusively for you. OBJECTIVE DEVELOPMENT has obtained USB Product ID
ranges under the Vendor ID 5824 from Wouter van Ooijen (Van Ooijen
Technische Informatica, www.voti.nl) and under the Vendor ID 8352 from
Jason Kotzin (now flirc.tv, Inc.). Both owners of the Vendor IDs have
obtained these IDs from the USB Implementers Forum, Inc. (www.usb.org).
OBJECTIVE DEVELOPMENT disclaims all liability which might arise from the
assignment of USB IDs.
2.5 USB Certification. Although not part of this agreement, we want to make
it clear that you cannot become USB certified when you use V-USB or a USB
Product ID assigned by OBJECTIVE DEVELOPMENT. AVR microcontrollers don't
meet the electrical specifications required by the USB specification and
the USB Implementers Forum certifies only members who bought a Vendor ID of
their own.
3 LICENSE RESTRICTIONS
3.1 Number of Units. Only one of the following three definitions is
applicable. Which one is determined by the amount you pay to OBJECTIVE
DEVELOPMENT, see section 4 ("Payment") below.
Hobby License: You may use V-USB according to section 2 above in no more
than 5 hardware units. These units must not be sold for profit.
Entry Level License: You may use V-USB according to section 2 above in no
more than 150 hardware units.
Professional License: You may use V-USB according to section 2 above in
any number of hardware units, except for large scale production ("unlimited
fair use"). Quantities below 10,000 units are not considered large scale
production. If your reach quantities which are obviously large scale
production, you must pay a license fee of 0.10 EUR per unit for all units
above 10,000.
3.2 Rental. You may not rent, lease, or lend V-USB or otherwise encumber
any copy of V-USB, or any of the rights granted herein.
3.3 Transfer. You may not transfer your rights under this Agreement to
another party without OBJECTIVE DEVELOPMENT's prior written consent. If
such consent is obtained, you may permanently transfer this License to
another party. The recipient of such transfer must agree to all terms and
conditions of this Agreement.
3.4 Reservation of Rights. OBJECTIVE DEVELOPMENT retains all rights not
expressly granted.
3.5 Non-Exclusive Rights. Your license rights under this Agreement are
non-exclusive.
3.6 Third Party Rights. This Agreement cannot grant you rights controlled
by third parties. In particular, you are not allowed to use the USB logo or
other trademarks owned by the USB Implementers Forum, Inc. without their
consent. Since such consent depends on USB certification, it should be
noted that V-USB will not pass certification because it does not
implement checksum verification and the microcontroller ports do not meet
the electrical specifications.
4 PAYMENT
The payment amount depends on the variation of this agreement (according to
section 3.1) into which you want to enter. Concrete prices are listed on
OBJECTIVE DEVELOPMENT's web site, usually at
http://www.obdev.at/vusb/license.html. You agree to pay the amount listed
there to OBJECTIVE DEVELOPMENT or OBJECTIVE DEVELOPMENT's payment processor
or reseller.
5 COPYRIGHT AND OWNERSHIP
V-USB is protected by copyright laws and international copyright
treaties, as well as other intellectual property laws and treaties. V-USB
is licensed, not sold.
6 TERM AND TERMINATION
6.1 Term. This Agreement shall continue indefinitely. However, OBJECTIVE
DEVELOPMENT may terminate this Agreement and revoke the granted license and
USB-IDs if you fail to comply with any of its terms and conditions.
6.2 Survival of Terms. All provisions regarding secrecy, confidentiality
and limitation of liability shall survive termination of this agreement.
7 DISCLAIMER OF WARRANTY AND LIABILITY
LIMITED WARRANTY. V-USB IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
KIND. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, OBJECTIVE
DEVELOPMENT AND ITS SUPPLIERS HEREBY DISCLAIM ALL WARRANTIES, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND
NON-INFRINGEMENT, WITH REGARD TO V-USB, AND THE PROVISION OF OR FAILURE
TO PROVIDE SUPPORT SERVICES. THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL
RIGHTS. YOU MAY HAVE OTHERS, WHICH VARY FROM STATE/JURISDICTION TO
STATE/JURISDICTION.
LIMITATION OF LIABILITY. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW,
IN NO EVENT SHALL OBJECTIVE DEVELOPMENT OR ITS SUPPLIERS BE LIABLE FOR ANY
SPECIAL, INCIDENTAL, INDIRECT, OR CONSEQUENTIAL DAMAGES WHATSOEVER
(INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR ANY OTHER PECUNIARY
LOSS) ARISING OUT OF THE USE OF OR INABILITY TO USE V-USB OR THE
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DEVELOPMENT HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. IN ANY
CASE, OBJECTIVE DEVELOPMENT'S ENTIRE LIABILITY UNDER ANY PROVISION OF THIS
AGREEMENT SHALL BE LIMITED TO THE AMOUNT ACTUALLY PAID BY YOU FOR V-USB.
8 MISCELLANEOUS TERMS
8.1 Marketing. OBJECTIVE DEVELOPMENT has the right to mention for marketing
purposes that you entered into this agreement.
8.2 Entire Agreement. This document represents the entire agreement between
OBJECTIVE DEVELOPMENT and you. It may only be modified in writing signed by
an authorized representative of both, OBJECTIVE DEVELOPMENT and you.
8.3 Severability. In case a provision of these terms and conditions should
be or become partly or entirely invalid, ineffective, or not executable,
the validity of all other provisions shall not be affected.
8.4 Applicable Law. This agreement is governed by the laws of the Republic
of Austria.
8.5 Responsible Courts. The responsible courts in Vienna/Austria will have
exclusive jurisdiction regarding all disputes in connection with this
agreement.

361
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OBJECTIVE DEVELOPMENT GmbH's V-USB driver software is distributed under the
terms and conditions of the GNU GPL version 2 or the GNU GPL version 3. It is
your choice whether you apply the terms of version 2 or version 3. The full
text of GPLv2 is included below. In addition to the requirements in the GPL,
we STRONGLY ENCOURAGE you to do the following:
(1) Publish your entire project on a web site and drop us a note with the URL.
Use the form at http://www.obdev.at/vusb/feedback.html for your submission.
(2) Adhere to minimum publication standards. Please include AT LEAST:
- a circuit diagram in PDF, PNG or GIF format
- full source code for the host software
- a Readme.txt file in ASCII format which describes the purpose of the
project and what can be found in which directories and which files
- a reference to http://www.obdev.at/vusb/
(3) If you improve the driver firmware itself, please give us a free license
to your modifications for our commercial license offerings.
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
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The precise terms and conditions for copying, distribution and
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How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
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convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
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Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.

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This is the Readme file to Objective Development's firmware-only USB driver
for Atmel AVR microcontrollers. For more information please visit
http://www.obdev.at/vusb/
This directory contains the USB firmware only. Copy it as-is to your own
project and add all .c and .S files to your project (these files are marked
with an asterisk in the list below). Then copy usbconfig-prototype.h as
usbconfig.h to your project and edit it according to your configuration.
TECHNICAL DOCUMENTATION
=======================
The technical documentation (API) for the firmware driver is contained in the
file "usbdrv.h". Please read all of it carefully! Configuration options are
documented in "usbconfig-prototype.h".
The driver consists of the following files:
Readme.txt ............. The file you are currently reading.
Changelog.txt .......... Release notes for all versions of the driver.
usbdrv.h ............... Driver interface definitions and technical docs.
* usbdrv.c ............... High level language part of the driver. Link this
module to your code!
* usbdrvasm.S ............ Assembler part of the driver. This module is mostly
a stub and includes one of the usbdrvasm*.S files
depending on processor clock. Link this module to
your code!
usbdrvasm*.inc ......... Assembler routines for particular clock frequencies.
Included by usbdrvasm.S, don't link it directly!
asmcommon.inc .......... Common assembler routines. Included by
usbdrvasm*.inc, don't link it directly!
usbconfig-prototype.h .. Prototype for your own usbdrv.h file.
* oddebug.c .............. Debug functions. Only used when DEBUG_LEVEL is
defined to a value greater than 0. Link this module
to your code!
oddebug.h .............. Interface definitions of the debug module.
usbportability.h ....... Header with compiler-dependent stuff.
usbdrvasm.asm .......... Compatibility stub for IAR-C-compiler. Use this
module instead of usbdrvasm.S when you assembler
with IAR's tools.
License.txt ............ Open Source license for this driver.
CommercialLicense.txt .. Optional commercial license for this driver.
USB-ID-FAQ.txt ......... General infos about USB Product- and Vendor-IDs.
USB-IDs-for-free.txt ... List and terms of use for free shared PIDs.
(*) ... These files should be linked to your project.
CPU CORE CLOCK FREQUENCY
========================
We supply assembler modules for clock frequencies of 12 MHz, 12.8 MHz, 15 MHz,
16 MHz, 16.5 MHz 18 MHz and 20 MHz. Other clock rates are not supported. The
actual clock rate must be configured in usbconfig.h.
12 MHz Clock
This is the traditional clock rate of V-USB because it's the lowest clock
rate where the timing constraints of the USB spec can be met.
15 MHz Clock
Similar to 12 MHz, but some NOPs inserted. On the other hand, the higher clock
rate allows for some loops which make the resulting code size somewhat smaller
than the 12 MHz version.
16 MHz Clock
This clock rate has been added for users of the Arduino board and other
ready-made boards which come with a fixed 16 MHz crystal. It's also an option
if you need the slightly higher clock rate for performance reasons. Since
16 MHz is not divisible by the USB low speed bit clock of 1.5 MHz, the code
is somewhat tricky and has to insert a leap cycle every third byte.
12.8 MHz and 16.5 MHz Clock
The assembler modules for these clock rates differ from the other modules
because they have been built for an RC oscillator with only 1% precision. The
receiver code inserts leap cycles to compensate for clock deviations. 1% is
also the precision which can be achieved by calibrating the internal RC
oscillator of the AVR. Please note that only AVRs with internal 64 MHz PLL
oscillator can reach 16.5 MHz with the RC oscillator. This includes the very
popular ATTiny25, ATTiny45, ATTiny85 series as well as the ATTiny26. Almost
all AVRs can reach 12.8 MHz, although this is outside the specified range.
See the EasyLogger example at http://www.obdev.at/vusb/easylogger.html for
code which calibrates the RC oscillator based on the USB frame clock.
18 MHz Clock
This module is closer to the USB specification because it performs an on the
fly CRC check for incoming packets. Packets with invalid checksum are
discarded as required by the spec. If you also implement checks for data
PID toggling on application level (see option USB_CFG_CHECK_DATA_TOGGLING
in usbconfig.h for more info), this ensures data integrity. Due to the CRC
tables and alignment requirements, this code is bigger than modules for other
clock rates. To activate this module, you must define USB_CFG_CHECK_CRC to 1
and USB_CFG_CLOCK_KHZ to 18000 in usbconfig.h.
20 MHz Clock
This module is for people who won't do it with less than the maximum. Since
20 MHz is not divisible by the USB low speed bit clock of 1.5 MHz, the code
uses similar tricks as the 16 MHz module to insert leap cycles.
USB IDENTIFIERS
===============
Every USB device needs a vendor- and a product-identifier (VID and PID). VIDs
are obtained from usb.org for a price of 1,500 USD. Once you have a VID, you
can assign PIDs at will.
Since an entry level cost of 1,500 USD is too high for most small companies
and hobbyists, we provide some VID/PID pairs for free. See the file
USB-IDs-for-free.txt for details.
Objective Development also has some license offerings which include product
IDs. See http://www.obdev.at/vusb/ for details.
DEVELOPMENT SYSTEM
==================
This driver has been developed and optimized for the GNU compiler version 3
and 4. We recommend that you use the GNU compiler suite because it is freely
available. V-USB has also been ported to the IAR compiler and assembler. It
has been tested with IAR 4.10B/W32 and 4.12A/W32 on an ATmega8 with the
"small" and "tiny" memory model. Not every release is tested with IAR CC and
the driver may therefore fail to compile with IAR. Please note that gcc is
more efficient for usbdrv.c because this module has been deliberately
optimized for gcc.
Gcc version 3 produces smaller code than version 4 due to new optimizing
capabilities which don't always improve things on 8 bit CPUs. The code size
generated by gcc 4 can be reduced with the compiler options
-fno-move-loop-invariants, -fno-tree-scev-cprop and
-fno-inline-small-functions in addition to -Os. On devices with more than
8k of flash memory, we also recommend the linker option --relax (written as
-Wl,--relax for gcc) to convert absolute calls into relative where possible.
For more information about optimizing options see:
http://www.tty1.net/blog/2008-04-29-avr-gcc-optimisations_en.html
These optimizations are good for gcc 4.x. Version 3.x of gcc does not support
most of these options and produces good code anyway.
USING V-USB FOR FREE
====================
The AVR firmware driver is published under the GNU General Public License
Version 2 (GPL2) and the GNU General Public License Version 3 (GPL3). It is
your choice whether you apply the terms of version 2 or version 3.
If you decide for the free GPL2 or GPL3, we STRONGLY ENCOURAGE you to do the
following things IN ADDITION to the obligations from the GPL:
(1) Publish your entire project on a web site and drop us a note with the URL.
Use the form at http://www.obdev.at/vusb/feedback.html for your submission.
If you don't have a web site, you can publish the project in obdev's
documentation wiki at
http://www.obdev.at/goto.php?t=vusb-wiki&p=hosted-projects.
(2) Adhere to minimum publication standards. Please include AT LEAST:
- a circuit diagram in PDF, PNG or GIF format
- full source code for the host software
- a Readme.txt file in ASCII format which describes the purpose of the
project and what can be found in which directories and which files
- a reference to http://www.obdev.at/vusb/
(3) If you improve the driver firmware itself, please give us a free license
to your modifications for our commercial license offerings.
COMMERCIAL LICENSES FOR V-USB
=============================
If you don't want to publish your source code under the terms of the GPL,
you can simply pay money for V-USB. As an additional benefit you get
USB PIDs for free, reserved exclusively to you. See the file
"CommercialLicense.txt" for details.

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Version 2012-07-09
==========================
WHY DO WE NEED THESE IDs?
==========================
USB is more than a low level protocol for data transport. It also defines a
common set of requests which must be understood by all devices. And as part
of these common requests, the specification defines data structures, the
USB Descriptors, which are used to describe the properties of the device.
From the perspective of an operating system, it is therefore possible to find
out basic properties of a device (such as e.g. the manufacturer and the name
of the device) without a device-specific driver. This is essential because
the operating system can choose a driver to load based on this information
(Plug-And-Play).
Among the most important properties in the Device Descriptor are the USB
Vendor- and Product-ID. Both are 16 bit integers. The most simple form of
driver matching is based on these IDs. The driver announces the Vendor- and
Product-IDs of the devices it can handle and the operating system loads the
appropriate driver when the device is connected.
It is obvious that this technique only works if the pair Vendor- plus
Product-ID is unique: Only devices which require the same driver can have the
same pair of IDs.
=====================================================
HOW DOES THE USB STANDARD ENSURE THAT IDs ARE UNIQUE?
=====================================================
Since it is so important that USB IDs are unique, the USB Implementers Forum,
Inc. (usb.org) needs a way to enforce this legally. It is not forbidden by
law to build a device and assign it any random numbers as IDs. Usb.org
therefore needs an agreement to regulate the use of USB IDs. The agreement
binds only parties who agreed to it, of course. Everybody else is free to use
any numbers for their IDs.
So how can usb.org ensure that every manufacturer of USB devices enters into
an agreement with them? They do it via trademark licensing. Usb.org has
registered the trademark "USB", all associated logos and related terms. If
you want to put an USB logo on your product or claim that it is USB
compliant, you must license these trademarks from usb.org. And this is where
you enter into an agreement. See the "USB-IF Trademark License Agreement and
Usage Guidelines for the USB-IF Logo" at
http://www.usb.org/developers/logo_license/.
Licensing the USB trademarks requires that you buy a USB Vendor-ID from
usb.org (one-time fee of ca. 2,000 USD), that you become a member of usb.org
(yearly fee of ca. 4,000 USD) and that you meet all the technical
specifications from the USB spec.
This means that most hobbyists and small companies will never be able to
become USB compliant, just because membership is so expensive. And you can't
be compliant with a driver based on V-USB anyway, because the AVR's port pins
don't meet the electrical specifications for USB. So, in principle, all
hobbyists and small companies are free to choose any random numbers for their
IDs. They have nothing to lose...
There is one exception worth noting, though: If you use a sub-component which
implements USB, the vendor of the sub-components may guarantee USB
compliance. This might apply to some or all of FTDI's solutions.
=======================================================================
WHY SHOULD YOU OBTAIN USB IDs EVEN IF YOU DON'T LICENSE USB TRADEMARKS?
=======================================================================
You have learned in the previous section that you are free to choose any
numbers for your IDs anyway. So why not do exactly this? There is still the
technical issue. If you choose IDs which are already in use by somebody else,
operating systems will load the wrong drivers and your device won't work.
Even if you choose IDs which are not currently in use, they may be in use in
the next version of the operating system or even after an automatic update.
So what you need is a pair of Vendor- and Product-IDs for which you have the
guarantee that no USB compliant product uses them. This implies that no
operating system will ever ship with drivers responsible for these IDs.
==============================================
HOW DOES OBJECTIVE DEVELOPMENT HANDLE USB IDs?
==============================================
Objective Development gives away pairs of USB-IDs with their V-USB licenses.
In order to ensure that these IDs are unique, Objective Development has an
agreement with the company/person who has bought the USB Vendor-ID from
usb.org. This agreement ensures that a range of USB Product-IDs is reserved
for assignment by Objective Development and that the owner of the Vendor-ID
won't give it to anybody else.
This means that you have to trust three parties to ensure uniqueness of
your IDs:
- Objective Development, that they don't give the same PID to more than
one person.
- The owner of the Vendor-ID that they don't assign PIDs from the range
assigned to Objective Development to anybody else.
- Usb.org that they don't assign the same Vendor-ID a second time.
==================================
WHO IS THE OWNER OF THE VENDOR-ID?
==================================
Objective Development has obtained ranges of USB Product-IDs under two
Vendor-IDs: Under Vendor-ID 5824 from Wouter van Ooijen (Van Ooijen
Technische Informatica, www.voti.nl) and under Vendor-ID 8352 from Jason
Kotzin (now flirc.tv, Inc.). Both VID owners have received their Vendor-ID
directly from usb.org.
=========================================================================
CAN I USE USB-IDs FROM OBJECTIVE DEVELOPMENT WITH OTHER DRIVERS/HARDWARE?
=========================================================================
The short answer is: Yes. All you get is a guarantee that the IDs are never
assigned to anybody else. What more do you need?
============================
WHAT ABOUT SHARED ID PAIRS?
============================
Objective Development has reserved some PID/VID pairs for shared use. You
have no guarantee of uniqueness for them, except that no USB compliant device
uses them. In order to avoid technical problems, we must ensure that all
devices with the same pair of IDs use the same driver on kernel level. For
details, see the file USB-IDs-for-free.txt.
======================================================
I HAVE HEARD THAT SUB-LICENSING OF USB-IDs IS ILLEGAL?
======================================================
A 16 bit integer number cannot be protected by copyright laws. It is not
sufficiently complex. And since none of the parties involved entered into the
USB-IF Trademark License Agreement, we are not bound by this agreement. So
there is no reason why it should be illegal to sub-license USB-IDs.
=============================================
WHO IS LIABLE IF THERE ARE INCOMPATIBILITIES?
=============================================
Objective Development disclaims all liabilities which might arise from the
assignment of IDs. If you guarantee product features to your customers
without proper disclaimer, YOU are liable for that.

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Version 2009-08-22
===========================
FREE USB-IDs FOR SHARED USE
===========================
Objective Development has reserved a set of USB Product-IDs for use according
to the guidelines outlined below. For more information about the concept of
USB IDs please see the file USB-ID-FAQ.txt. Objective Development guarantees
that the IDs listed below are not used by any USB compliant devices.
====================
MECHANISM OF SHARING
====================
From a technical point of view, two different devices can share the same USB
Vendor- and Product-ID if they require the same driver on operating system
level. We make use of this fact by assigning separate IDs for various device
classes. On application layer, devices must be distinguished by their textual
name or serial number. We offer separate sets of IDs for discrimination by
textual name and for serial number.
Examples for shared use of USB IDs are included with V-USB in the "examples"
subdirectory.
======================================
IDs FOR DISCRIMINATION BY TEXTUAL NAME
======================================
If you use one of the IDs listed below, your device and host-side software
must conform to these rules:
(1) The USB device MUST provide a textual representation of the manufacturer
and product identification. The manufacturer identification MUST be available
at least in USB language 0x0409 (English/US).
(2) The textual manufacturer identification MUST contain either an Internet
domain name (e.g. "mycompany.com") registered and owned by you, or an e-mail
address under your control (e.g. "myname@gmx.net"). You can embed the domain
name or e-mail address in any string you like, e.g. "Objective Development
http://www.obdev.at/vusb/".
(3) You are responsible for retaining ownership of the domain or e-mail
address for as long as any of your products are in use.
(4) You may choose any string for the textual product identification, as long
as this string is unique within the scope of your textual manufacturer
identification.
(5) Application side device look-up MUST be based on the textual manufacturer
and product identification in addition to VID/PID matching. The driver
matching MUST be a comparison of the entire strings, NOT a sub-string match.
(6) For devices which implement a particular USB device class (e.g. HID), the
operating system's default class driver MUST be used. If an operating system
driver for Vendor Class devices is needed, this driver must be libusb or
libusb-win32 (see http://libusb.org/ and
http://libusb-win32.sourceforge.net/).
Table if IDs for discrimination by textual name:
PID dec (hex) | VID dec (hex) | Description of use
==============+===============+============================================
1500 (0x05dc) | 5824 (0x16c0) | For Vendor Class devices with libusb
--------------+---------------+--------------------------------------------
1503 (0x05df) | 5824 (0x16c0) | For generic HID class devices (which are
| | NOT mice, keyboards or joysticks)
--------------+---------------+--------------------------------------------
1505 (0x05e1) | 5824 (0x16c0) | For CDC-ACM class devices (modems)
--------------+---------------+--------------------------------------------
1508 (0x05e4) | 5824 (0x16c0) | For MIDI class devices
--------------+---------------+--------------------------------------------
Note that Windows caches the textual product- and vendor-description for
mice, keyboards and joysticks. Name-bsed discrimination is therefore not
recommended for these device classes.
=======================================
IDs FOR DISCRIMINATION BY SERIAL NUMBER
=======================================
If you use one of the IDs listed below, your device and host-side software
must conform to these rules:
(1) The USB device MUST provide a textual representation of the serial
number, unless ONLY the operating system's default class driver is used.
The serial number string MUST be available at least in USB language 0x0409
(English/US).
(2) The serial number MUST start with either an Internet domain name (e.g.
"mycompany.com") registered and owned by you, or an e-mail address under your
control (e.g. "myname@gmx.net"), both terminated with a colon (":") character.
You MAY append any string you like for further discrimination of your devices.
(3) You are responsible for retaining ownership of the domain or e-mail
address for as long as any of your products are in use.
(5) Application side device look-up MUST be based on the serial number string
in addition to VID/PID matching. The matching must start at the first
character of the serial number string and include the colon character
terminating your domain or e-mail address. It MAY stop anywhere after that.
(6) For devices which implement a particular USB device class (e.g. HID), the
operating system's default class driver MUST be used. If an operating system
driver for Vendor Class devices is needed, this driver must be libusb or
libusb-win32 (see http://libusb.org/ and
http://libusb-win32.sourceforge.net/).
(7) If ONLY the operating system's default class driver is used, e.g. for
mice, keyboards, joysticks, CDC or MIDI devices and no discrimination by an
application is needed, the serial number may be omitted.
Table if IDs for discrimination by serial number string:
PID dec (hex) | VID dec (hex) | Description of use
===============+===============+===========================================
10200 (0x27d8) | 5824 (0x16c0) | For Vendor Class devices with libusb
---------------+---------------+-------------------------------------------
10201 (0x27d9) | 5824 (0x16c0) | For generic HID class devices (which are
| | NOT mice, keyboards or joysticks)
---------------+---------------+-------------------------------------------
10202 (0x27da) | 5824 (0x16c0) | For USB Mice
---------------+---------------+-------------------------------------------
10203 (0x27db) | 5824 (0x16c0) | For USB Keyboards
---------------+---------------+-------------------------------------------
10204 (0x27dc) | 5824 (0x16c0) | For USB Joysticks
---------------+---------------+-------------------------------------------
10205 (0x27dd) | 5824 (0x16c0) | For CDC-ACM class devices (modems)
---------------+---------------+-------------------------------------------
10206 (0x27de) | 5824 (0x16c0) | For MIDI class devices
---------------+---------------+-------------------------------------------
=================
ORIGIN OF USB-IDs
=================
OBJECTIVE DEVELOPMENT Software GmbH has obtained all VID/PID pairs listed
here from Wouter van Ooijen (see www.voti.nl) for exclusive disposition.
Wouter van Ooijen has obtained the VID from the USB Implementers Forum, Inc.
(see www.usb.org). The VID is registered for the company name "Van Ooijen
Technische Informatica".
==========
DISCLAIMER
==========
OBJECTIVE DEVELOPMENT Software GmbH disclaims all liability for any
problems which are caused by the shared use of these VID/PID pairs.

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/* Name: asmcommon.inc
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Christian Starkjohann
* Creation Date: 2007-11-05
* Tabsize: 4
* Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
/* Do not link this file! Link usbdrvasm.S instead, which includes the
* appropriate implementation!
*/
/*
General Description:
This file contains assembler code which is shared among the USB driver
implementations for different CPU cocks. Since the code must be inserted
in the middle of the module, it's split out into this file and #included.
Jump destinations called from outside:
sofError: Called when no start sequence was found.
se0: Called when a package has been successfully received.
overflow: Called when receive buffer overflows.
doReturn: Called after sending data.
Outside jump destinations used by this module:
waitForJ: Called to receive an already arriving packet.
sendAckAndReti:
sendNakAndReti:
sendCntAndReti:
usbSendAndReti:
The following macros must be defined before this file is included:
.macro POP_STANDARD
.endm
.macro POP_RETI
.endm
*/
#define token x1
overflow:
ldi x2, 1<<USB_INTR_PENDING_BIT
USB_STORE_PENDING(x2) ; clear any pending interrupts
ignorePacket:
clr token
rjmp storeTokenAndReturn
;----------------------------------------------------------------------------
; Processing of received packet (numbers in brackets are cycles after center of SE0)
;----------------------------------------------------------------------------
;This is the only non-error exit point for the software receiver loop
;we don't check any CRCs here because there is no time left.
se0:
subi cnt, USB_BUFSIZE ;[5]
neg cnt ;[6]
sub YL, cnt ;[7]
sbci YH, 0 ;[8]
ldi x2, 1<<USB_INTR_PENDING_BIT ;[9]
USB_STORE_PENDING(x2) ;[10] clear pending intr and check flag later. SE0 should be over.
ld token, y ;[11]
cpi token, USBPID_DATA0 ;[13]
breq handleData ;[14]
cpi token, USBPID_DATA1 ;[15]
breq handleData ;[16]
lds shift, usbDeviceAddr;[17]
ldd x2, y+1 ;[19] ADDR and 1 bit endpoint number
lsl x2 ;[21] shift out 1 bit endpoint number
cpse x2, shift ;[22]
rjmp ignorePacket ;[23]
/* only compute endpoint number in x3 if required later */
#if USB_CFG_HAVE_INTRIN_ENDPOINT || USB_CFG_IMPLEMENT_FN_WRITEOUT
ldd x3, y+2 ;[24] endpoint number + crc
rol x3 ;[26] shift in LSB of endpoint
#endif
cpi token, USBPID_IN ;[27]
breq handleIn ;[28]
cpi token, USBPID_SETUP ;[29]
breq handleSetupOrOut ;[30]
cpi token, USBPID_OUT ;[31]
brne ignorePacket ;[32] must be ack, nak or whatever
; rjmp handleSetupOrOut ; fallthrough
;Setup and Out are followed by a data packet two bit times (16 cycles) after
;the end of SE0. The sync code allows up to 40 cycles delay from the start of
;the sync pattern until the first bit is sampled. That's a total of 56 cycles.
handleSetupOrOut: ;[32]
#if USB_CFG_IMPLEMENT_FN_WRITEOUT /* if we have data for endpoint != 0, set usbCurrentTok to address */
andi x3, 0xf ;[32]
breq storeTokenAndReturn ;[33]
mov token, x3 ;[34] indicate that this is endpoint x OUT
#endif
storeTokenAndReturn:
sts usbCurrentTok, token;[35]
doReturn:
POP_STANDARD ;[37] 12...16 cycles
USB_LOAD_PENDING(YL) ;[49]
sbrc YL, USB_INTR_PENDING_BIT;[50] check whether data is already arriving
rjmp waitForJ ;[51] save the pops and pushes -- a new interrupt is already pending
sofError:
POP_RETI ;macro call
reti
handleData:
#if USB_CFG_CHECK_CRC
CRC_CLEANUP_AND_CHECK ; jumps to ignorePacket if CRC error
#endif
lds shift, usbCurrentTok;[18]
tst shift ;[20]
breq doReturn ;[21]
lds x2, usbRxLen ;[22]
tst x2 ;[24]
brne sendNakAndReti ;[25]
; 2006-03-11: The following two lines fix a problem where the device was not
; recognized if usbPoll() was called less frequently than once every 4 ms.
cpi cnt, 4 ;[26] zero sized data packets are status phase only -- ignore and ack
brmi sendAckAndReti ;[27] keep rx buffer clean -- we must not NAK next SETUP
#if USB_CFG_CHECK_DATA_TOGGLING
sts usbCurrentDataToken, token ; store for checking by C code
#endif
sts usbRxLen, cnt ;[28] store received data, swap buffers
sts usbRxToken, shift ;[30]
lds x2, usbInputBufOffset;[32] swap buffers
ldi cnt, USB_BUFSIZE ;[34]
sub cnt, x2 ;[35]
sts usbInputBufOffset, cnt;[36] buffers now swapped
rjmp sendAckAndReti ;[38] 40 + 17 = 57 until SOP
handleIn:
;We don't send any data as long as the C code has not processed the current
;input data and potentially updated the output data. That's more efficient
;in terms of code size than clearing the tx buffers when a packet is received.
lds x1, usbRxLen ;[30]
cpi x1, 1 ;[32] negative values are flow control, 0 means "buffer free"
brge sendNakAndReti ;[33] unprocessed input packet?
ldi x1, USBPID_NAK ;[34] prepare value for usbTxLen
#if USB_CFG_HAVE_INTRIN_ENDPOINT
andi x3, 0xf ;[35] x3 contains endpoint
#if USB_CFG_SUPPRESS_INTR_CODE
brne sendNakAndReti ;[36]
#else
brne handleIn1 ;[36]
#endif
#endif
lds cnt, usbTxLen ;[37]
sbrc cnt, 4 ;[39] all handshake tokens have bit 4 set
rjmp sendCntAndReti ;[40] 42 + 16 = 58 until SOP
sts usbTxLen, x1 ;[41] x1 == USBPID_NAK from above
ldi YL, lo8(usbTxBuf) ;[43]
ldi YH, hi8(usbTxBuf) ;[44]
rjmp usbSendAndReti ;[45] 57 + 12 = 59 until SOP
; Comment about when to set usbTxLen to USBPID_NAK:
; We should set it back when we receive the ACK from the host. This would
; be simple to implement: One static variable which stores whether the last
; tx was for endpoint 0 or 1 and a compare in the receiver to distinguish the
; ACK. However, we set it back immediately when we send the package,
; assuming that no error occurs and the host sends an ACK. We save one byte
; RAM this way and avoid potential problems with endless retries. The rest of
; the driver assumes error-free transfers anyway.
#if !USB_CFG_SUPPRESS_INTR_CODE && USB_CFG_HAVE_INTRIN_ENDPOINT /* placed here due to relative jump range */
handleIn1: ;[38]
#if USB_CFG_HAVE_INTRIN_ENDPOINT3
; 2006-06-10 as suggested by O.Tamura: support second INTR IN / BULK IN endpoint
cpi x3, USB_CFG_EP3_NUMBER;[38]
breq handleIn3 ;[39]
#endif
lds cnt, usbTxLen1 ;[40]
sbrc cnt, 4 ;[42] all handshake tokens have bit 4 set
rjmp sendCntAndReti ;[43] 47 + 16 = 63 until SOP
sts usbTxLen1, x1 ;[44] x1 == USBPID_NAK from above
ldi YL, lo8(usbTxBuf1) ;[46]
ldi YH, hi8(usbTxBuf1) ;[47]
rjmp usbSendAndReti ;[48] 50 + 12 = 62 until SOP
#if USB_CFG_HAVE_INTRIN_ENDPOINT3
handleIn3:
lds cnt, usbTxLen3 ;[41]
sbrc cnt, 4 ;[43]
rjmp sendCntAndReti ;[44] 49 + 16 = 65 until SOP
sts usbTxLen3, x1 ;[45] x1 == USBPID_NAK from above
ldi YL, lo8(usbTxBuf3) ;[47]
ldi YH, hi8(usbTxBuf3) ;[48]
rjmp usbSendAndReti ;[49] 51 + 12 = 63 until SOP
#endif
#endif

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/* Name: oddebug.c
* Project: AVR library
* Author: Christian Starkjohann
* Creation Date: 2005-01-16
* Tabsize: 4
* Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
#include "oddebug.h"
#if DEBUG_LEVEL > 0
#warning "Never compile production devices with debugging enabled"
static void uartPutc(char c)
{
while(!(ODDBG_USR & (1 << ODDBG_UDRE))); /* wait for data register empty */
ODDBG_UDR = c;
}
static uchar hexAscii(uchar h)
{
h &= 0xf;
if(h >= 10)
h += 'a' - (uchar)10 - '0';
h += '0';
return h;
}
static void printHex(uchar c)
{
uartPutc(hexAscii(c >> 4));
uartPutc(hexAscii(c));
}
void odDebug(uchar prefix, uchar *data, uchar len)
{
printHex(prefix);
uartPutc(':');
while(len--){
uartPutc(' ');
printHex(*data++);
}
uartPutc('\r');
uartPutc('\n');
}
#endif

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/* Name: oddebug.h
* Project: AVR library
* Author: Christian Starkjohann
* Creation Date: 2005-01-16
* Tabsize: 4
* Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
#ifndef __oddebug_h_included__
#define __oddebug_h_included__
/*
General Description:
This module implements a function for debug logs on the serial line of the
AVR microcontroller. Debugging can be configured with the define
'DEBUG_LEVEL'. If this macro is not defined or defined to 0, all debugging
calls are no-ops. If it is 1, DBG1 logs will appear, but not DBG2. If it is
2, DBG1 and DBG2 logs will be printed.
A debug log consists of a label ('prefix') to indicate which debug log created
the output and a memory block to dump in hex ('data' and 'len').
*/
#ifndef F_CPU
# define F_CPU 12000000 /* 12 MHz */
#endif
/* make sure we have the UART defines: */
#include "usbportability.h"
#ifndef uchar
# define uchar unsigned char
#endif
#if DEBUG_LEVEL > 0 && !(defined TXEN || defined TXEN0) /* no UART in device */
# warning "Debugging disabled because device has no UART"
# undef DEBUG_LEVEL
#endif
#ifndef DEBUG_LEVEL
# define DEBUG_LEVEL 0
#endif
/* ------------------------------------------------------------------------- */
#if DEBUG_LEVEL > 0
# define DBG1(prefix, data, len) odDebug(prefix, data, len)
#else
# define DBG1(prefix, data, len)
#endif
#if DEBUG_LEVEL > 1
# define DBG2(prefix, data, len) odDebug(prefix, data, len)
#else
# define DBG2(prefix, data, len)
#endif
/* ------------------------------------------------------------------------- */
#if DEBUG_LEVEL > 0
extern void odDebug(uchar prefix, uchar *data, uchar len);
/* Try to find our control registers; ATMEL likes to rename these */
#if defined UBRR
# define ODDBG_UBRR UBRR
#elif defined UBRRL
# define ODDBG_UBRR UBRRL
#elif defined UBRR0
# define ODDBG_UBRR UBRR0
#elif defined UBRR0L
# define ODDBG_UBRR UBRR0L
#endif
#if defined UCR
# define ODDBG_UCR UCR
#elif defined UCSRB
# define ODDBG_UCR UCSRB
#elif defined UCSR0B
# define ODDBG_UCR UCSR0B
#endif
#if defined TXEN
# define ODDBG_TXEN TXEN
#else
# define ODDBG_TXEN TXEN0
#endif
#if defined USR
# define ODDBG_USR USR
#elif defined UCSRA
# define ODDBG_USR UCSRA
#elif defined UCSR0A
# define ODDBG_USR UCSR0A
#endif
#if defined UDRE
# define ODDBG_UDRE UDRE
#else
# define ODDBG_UDRE UDRE0
#endif
#if defined UDR
# define ODDBG_UDR UDR
#elif defined UDR0
# define ODDBG_UDR UDR0
#endif
static inline void odDebugInit(void)
{
ODDBG_UCR |= (1<<ODDBG_TXEN);
ODDBG_UBRR = F_CPU / (19200 * 16L) - 1;
}
#else
# define odDebugInit()
#endif
/* ------------------------------------------------------------------------- */
#endif /* __oddebug_h_included__ */

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/* Name: usbconfig.h
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Christian Starkjohann
* Creation Date: 2005-04-01
* Tabsize: 4
* Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
#ifndef __usbconfig_h_included__
#define __usbconfig_h_included__
/*
General Description:
This file is an example configuration (with inline documentation) for the USB
driver. It configures V-USB for USB D+ connected to Port D bit 2 (which is
also hardware interrupt 0 on many devices) and USB D- to Port D bit 4. You may
wire the lines to any other port, as long as D+ is also wired to INT0 (or any
other hardware interrupt, as long as it is the highest level interrupt, see
section at the end of this file).
+ To create your own usbconfig.h file, copy this file to your project's
+ firmware source directory) and rename it to "usbconfig.h".
+ Then edit it accordingly.
*/
/* ---------------------------- Hardware Config ---------------------------- */
#define USB_CFG_IOPORTNAME D
/* This is the port where the USB bus is connected. When you configure it to
* "B", the registers PORTB, PINB and DDRB will be used.
*/
#define USB_CFG_DMINUS_BIT 4
/* This is the bit number in USB_CFG_IOPORT where the USB D- line is connected.
* This may be any bit in the port.
*/
#define USB_CFG_DPLUS_BIT 2
/* This is the bit number in USB_CFG_IOPORT where the USB D+ line is connected.
* This may be any bit in the port. Please note that D+ must also be connected
* to interrupt pin INT0! [You can also use other interrupts, see section
* "Optional MCU Description" below, or you can connect D- to the interrupt, as
* it is required if you use the USB_COUNT_SOF feature. If you use D- for the
* interrupt, the USB interrupt will also be triggered at Start-Of-Frame
* markers every millisecond.]
*/
#define USB_CFG_CLOCK_KHZ (F_CPU/1000)
/* Clock rate of the AVR in kHz. Legal values are 12000, 12800, 15000, 16000,
* 16500, 18000 and 20000. The 12.8 MHz and 16.5 MHz versions of the code
* require no crystal, they tolerate +/- 1% deviation from the nominal
* frequency. All other rates require a precision of 2000 ppm and thus a
* crystal!
* Since F_CPU should be defined to your actual clock rate anyway, you should
* not need to modify this setting.
*/
#define USB_CFG_CHECK_CRC 0
/* Define this to 1 if you want that the driver checks integrity of incoming
* data packets (CRC checks). CRC checks cost quite a bit of code size and are
* currently only available for 18 MHz crystal clock. You must choose
* USB_CFG_CLOCK_KHZ = 18000 if you enable this option.
*/
/* ----------------------- Optional Hardware Config ------------------------ */
/* #define USB_CFG_PULLUP_IOPORTNAME D */
/* If you connect the 1.5k pullup resistor from D- to a port pin instead of
* V+, you can connect and disconnect the device from firmware by calling
* the macros usbDeviceConnect() and usbDeviceDisconnect() (see usbdrv.h).
* This constant defines the port on which the pullup resistor is connected.
*/
/* #define USB_CFG_PULLUP_BIT 4 */
/* This constant defines the bit number in USB_CFG_PULLUP_IOPORT (defined
* above) where the 1.5k pullup resistor is connected. See description
* above for details.
*/
/* --------------------------- Functional Range ---------------------------- */
#define USB_CFG_HAVE_INTRIN_ENDPOINT 0
/* Define this to 1 if you want to compile a version with two endpoints: The
* default control endpoint 0 and an interrupt-in endpoint (any other endpoint
* number).
*/
#define USB_CFG_HAVE_INTRIN_ENDPOINT3 0
/* Define this to 1 if you want to compile a version with three endpoints: The
* default control endpoint 0, an interrupt-in endpoint 3 (or the number
* configured below) and a catch-all default interrupt-in endpoint as above.
* You must also define USB_CFG_HAVE_INTRIN_ENDPOINT to 1 for this feature.
*/
#define USB_CFG_EP3_NUMBER 3
/* If the so-called endpoint 3 is used, it can now be configured to any other
* endpoint number (except 0) with this macro. Default if undefined is 3.
*/
/* #define USB_INITIAL_DATATOKEN USBPID_DATA1 */
/* The above macro defines the startup condition for data toggling on the
* interrupt/bulk endpoints 1 and 3. Defaults to USBPID_DATA1.
* Since the token is toggled BEFORE sending any data, the first packet is
* sent with the oposite value of this configuration!
*/
#define USB_CFG_IMPLEMENT_HALT 0
/* Define this to 1 if you also want to implement the ENDPOINT_HALT feature
* for endpoint 1 (interrupt endpoint). Although you may not need this feature,
* it is required by the standard. We have made it a config option because it
* bloats the code considerably.
*/
#define USB_CFG_SUPPRESS_INTR_CODE 0
/* Define this to 1 if you want to declare interrupt-in endpoints, but don't
* want to send any data over them. If this macro is defined to 1, functions
* usbSetInterrupt() and usbSetInterrupt3() are omitted. This is useful if
* you need the interrupt-in endpoints in order to comply to an interface
* (e.g. HID), but never want to send any data. This option saves a couple
* of bytes in flash memory and the transmit buffers in RAM.
*/
#define USB_CFG_INTR_POLL_INTERVAL 10
/* If you compile a version with endpoint 1 (interrupt-in), this is the poll
* interval. The value is in milliseconds and must not be less than 10 ms for
* low speed devices.
*/
#define USB_CFG_IS_SELF_POWERED 0
/* Define this to 1 if the device has its own power supply. Set it to 0 if the
* device is powered from the USB bus.
*/
#define USB_CFG_MAX_BUS_POWER 100
/* Set this variable to the maximum USB bus power consumption of your device.
* The value is in milliamperes. [It will be divided by two since USB
* communicates power requirements in units of 2 mA.]
*/
#define USB_CFG_IMPLEMENT_FN_WRITE 0
/* Set this to 1 if you want usbFunctionWrite() to be called for control-out
* transfers. Set it to 0 if you don't need it and want to save a couple of
* bytes.
*/
#define USB_CFG_IMPLEMENT_FN_READ 0
/* Set this to 1 if you need to send control replies which are generated
* "on the fly" when usbFunctionRead() is called. If you only want to send
* data from a static buffer, set it to 0 and return the data from
* usbFunctionSetup(). This saves a couple of bytes.
*/
#define USB_CFG_IMPLEMENT_FN_WRITEOUT 0
/* Define this to 1 if you want to use interrupt-out (or bulk out) endpoints.
* You must implement the function usbFunctionWriteOut() which receives all
* interrupt/bulk data sent to any endpoint other than 0. The endpoint number
* can be found in 'usbRxToken'.
*/
#define USB_CFG_HAVE_FLOWCONTROL 0
/* Define this to 1 if you want flowcontrol over USB data. See the definition
* of the macros usbDisableAllRequests() and usbEnableAllRequests() in
* usbdrv.h.
*/
#define USB_CFG_DRIVER_FLASH_PAGE 0
/* If the device has more than 64 kBytes of flash, define this to the 64 k page
* where the driver's constants (descriptors) are located. Or in other words:
* Define this to 1 for boot loaders on the ATMega128.
*/
#define USB_CFG_LONG_TRANSFERS 0
/* Define this to 1 if you want to send/receive blocks of more than 254 bytes
* in a single control-in or control-out transfer. Note that the capability
* for long transfers increases the driver size.
*/
/* #define USB_RX_USER_HOOK(data, len) if(usbRxToken == (uchar)USBPID_SETUP) blinkLED(); */
/* This macro is a hook if you want to do unconventional things. If it is
* defined, it's inserted at the beginning of received message processing.
* If you eat the received message and don't want default processing to
* proceed, do a return after doing your things. One possible application
* (besides debugging) is to flash a status LED on each packet.
*/
/* #define USB_RESET_HOOK(resetStarts) if(!resetStarts){hadUsbReset();} */
/* This macro is a hook if you need to know when an USB RESET occurs. It has
* one parameter which distinguishes between the start of RESET state and its
* end.
*/
/* #define USB_SET_ADDRESS_HOOK() hadAddressAssigned(); */
/* This macro (if defined) is executed when a USB SET_ADDRESS request was
* received.
*/
#define USB_COUNT_SOF 0
/* define this macro to 1 if you need the global variable "usbSofCount" which
* counts SOF packets. This feature requires that the hardware interrupt is
* connected to D- instead of D+.
*/
/* #ifdef __ASSEMBLER__
* macro myAssemblerMacro
* in YL, TCNT0
* sts timer0Snapshot, YL
* endm
* #endif
* #define USB_SOF_HOOK myAssemblerMacro
* This macro (if defined) is executed in the assembler module when a
* Start Of Frame condition is detected. It is recommended to define it to
* the name of an assembler macro which is defined here as well so that more
* than one assembler instruction can be used. The macro may use the register
* YL and modify SREG. If it lasts longer than a couple of cycles, USB messages
* immediately after an SOF pulse may be lost and must be retried by the host.
* What can you do with this hook? Since the SOF signal occurs exactly every
* 1 ms (unless the host is in sleep mode), you can use it to tune OSCCAL in
* designs running on the internal RC oscillator.
* Please note that Start Of Frame detection works only if D- is wired to the
* interrupt, not D+. THIS IS DIFFERENT THAN MOST EXAMPLES!
*/
#define USB_CFG_CHECK_DATA_TOGGLING 0
/* define this macro to 1 if you want to filter out duplicate data packets
* sent by the host. Duplicates occur only as a consequence of communication
* errors, when the host does not receive an ACK. Please note that you need to
* implement the filtering yourself in usbFunctionWriteOut() and
* usbFunctionWrite(). Use the global usbCurrentDataToken and a static variable
* for each control- and out-endpoint to check for duplicate packets.
*/
#define USB_CFG_HAVE_MEASURE_FRAME_LENGTH 0
/* define this macro to 1 if you want the function usbMeasureFrameLength()
* compiled in. This function can be used to calibrate the AVR's RC oscillator.
*/
#define USB_USE_FAST_CRC 0
/* The assembler module has two implementations for the CRC algorithm. One is
* faster, the other is smaller. This CRC routine is only used for transmitted
* messages where timing is not critical. The faster routine needs 31 cycles
* per byte while the smaller one needs 61 to 69 cycles. The faster routine
* may be worth the 32 bytes bigger code size if you transmit lots of data and
* run the AVR close to its limit.
*/
/* -------------------------- Device Description --------------------------- */
#define USB_CFG_VENDOR_ID 0xc0, 0x16 /* = 0x16c0 = 5824 = voti.nl */
/* USB vendor ID for the device, low byte first. If you have registered your
* own Vendor ID, define it here. Otherwise you may use one of obdev's free
* shared VID/PID pairs. Be sure to read USB-IDs-for-free.txt for rules!
* *** IMPORTANT NOTE ***
* This template uses obdev's shared VID/PID pair for Vendor Class devices
* with libusb: 0x16c0/0x5dc. Use this VID/PID pair ONLY if you understand
* the implications!
*/
#define USB_CFG_DEVICE_ID 0xdc, 0x05 /* = 0x05dc = 1500 */
/* This is the ID of the product, low byte first. It is interpreted in the
* scope of the vendor ID. If you have registered your own VID with usb.org
* or if you have licensed a PID from somebody else, define it here. Otherwise
* you may use one of obdev's free shared VID/PID pairs. See the file
* USB-IDs-for-free.txt for details!
* *** IMPORTANT NOTE ***
* This template uses obdev's shared VID/PID pair for Vendor Class devices
* with libusb: 0x16c0/0x5dc. Use this VID/PID pair ONLY if you understand
* the implications!
*/
#define USB_CFG_DEVICE_VERSION 0x00, 0x01
/* Version number of the device: Minor number first, then major number.
*/
#define USB_CFG_VENDOR_NAME 'o', 'b', 'd', 'e', 'v', '.', 'a', 't'
#define USB_CFG_VENDOR_NAME_LEN 8
/* These two values define the vendor name returned by the USB device. The name
* must be given as a list of characters under single quotes. The characters
* are interpreted as Unicode (UTF-16) entities.
* If you don't want a vendor name string, undefine these macros.
* ALWAYS define a vendor name containing your Internet domain name if you use
* obdev's free shared VID/PID pair. See the file USB-IDs-for-free.txt for
* details.
*/
#define USB_CFG_DEVICE_NAME 'T', 'e', 'm', 'p', 'l', 'a', 't', 'e'
#define USB_CFG_DEVICE_NAME_LEN 8
/* Same as above for the device name. If you don't want a device name, undefine
* the macros. See the file USB-IDs-for-free.txt before you assign a name if
* you use a shared VID/PID.
*/
/*#define USB_CFG_SERIAL_NUMBER 'N', 'o', 'n', 'e' */
/*#define USB_CFG_SERIAL_NUMBER_LEN 0 */
/* Same as above for the serial number. If you don't want a serial number,
* undefine the macros.
* It may be useful to provide the serial number through other means than at
* compile time. See the section about descriptor properties below for how
* to fine tune control over USB descriptors such as the string descriptor
* for the serial number.
*/
#define USB_CFG_DEVICE_CLASS 0xff /* set to 0 if deferred to interface */
#define USB_CFG_DEVICE_SUBCLASS 0
/* See USB specification if you want to conform to an existing device class.
* Class 0xff is "vendor specific".
*/
#define USB_CFG_INTERFACE_CLASS 0 /* define class here if not at device level */
#define USB_CFG_INTERFACE_SUBCLASS 0
#define USB_CFG_INTERFACE_PROTOCOL 0
/* See USB specification if you want to conform to an existing device class or
* protocol. The following classes must be set at interface level:
* HID class is 3, no subclass and protocol required (but may be useful!)
* CDC class is 2, use subclass 2 and protocol 1 for ACM
*/
/* #define USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH 42 */
/* Define this to the length of the HID report descriptor, if you implement
* an HID device. Otherwise don't define it or define it to 0.
* If you use this define, you must add a PROGMEM character array named
* "usbHidReportDescriptor" to your code which contains the report descriptor.
* Don't forget to keep the array and this define in sync!
*/
/* #define USB_PUBLIC static */
/* Use the define above if you #include usbdrv.c instead of linking against it.
* This technique saves a couple of bytes in flash memory.
*/
/* ------------------- Fine Control over USB Descriptors ------------------- */
/* If you don't want to use the driver's default USB descriptors, you can
* provide our own. These can be provided as (1) fixed length static data in
* flash memory, (2) fixed length static data in RAM or (3) dynamically at
* runtime in the function usbFunctionDescriptor(). See usbdrv.h for more
* information about this function.
* Descriptor handling is configured through the descriptor's properties. If
* no properties are defined or if they are 0, the default descriptor is used.
* Possible properties are:
* + USB_PROP_IS_DYNAMIC: The data for the descriptor should be fetched
* at runtime via usbFunctionDescriptor(). If the usbMsgPtr mechanism is
* used, the data is in FLASH by default. Add property USB_PROP_IS_RAM if
* you want RAM pointers.
* + USB_PROP_IS_RAM: The data returned by usbFunctionDescriptor() or found
* in static memory is in RAM, not in flash memory.
* + USB_PROP_LENGTH(len): If the data is in static memory (RAM or flash),
* the driver must know the descriptor's length. The descriptor itself is
* found at the address of a well known identifier (see below).
* List of static descriptor names (must be declared PROGMEM if in flash):
* char usbDescriptorDevice[];
* char usbDescriptorConfiguration[];
* char usbDescriptorHidReport[];
* char usbDescriptorString0[];
* int usbDescriptorStringVendor[];
* int usbDescriptorStringDevice[];
* int usbDescriptorStringSerialNumber[];
* Other descriptors can't be provided statically, they must be provided
* dynamically at runtime.
*
* Descriptor properties are or-ed or added together, e.g.:
* #define USB_CFG_DESCR_PROPS_DEVICE (USB_PROP_IS_RAM | USB_PROP_LENGTH(18))
*
* The following descriptors are defined:
* USB_CFG_DESCR_PROPS_DEVICE
* USB_CFG_DESCR_PROPS_CONFIGURATION
* USB_CFG_DESCR_PROPS_STRINGS
* USB_CFG_DESCR_PROPS_STRING_0
* USB_CFG_DESCR_PROPS_STRING_VENDOR
* USB_CFG_DESCR_PROPS_STRING_PRODUCT
* USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER
* USB_CFG_DESCR_PROPS_HID
* USB_CFG_DESCR_PROPS_HID_REPORT
* USB_CFG_DESCR_PROPS_UNKNOWN (for all descriptors not handled by the driver)
*
* Note about string descriptors: String descriptors are not just strings, they
* are Unicode strings prefixed with a 2 byte header. Example:
* int serialNumberDescriptor[] = {
* USB_STRING_DESCRIPTOR_HEADER(6),
* 'S', 'e', 'r', 'i', 'a', 'l'
* };
*/
#define USB_CFG_DESCR_PROPS_DEVICE 0
#define USB_CFG_DESCR_PROPS_CONFIGURATION 0
#define USB_CFG_DESCR_PROPS_STRINGS 0
#define USB_CFG_DESCR_PROPS_STRING_0 0
#define USB_CFG_DESCR_PROPS_STRING_VENDOR 0
#define USB_CFG_DESCR_PROPS_STRING_PRODUCT 0
#define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER 0
#define USB_CFG_DESCR_PROPS_HID 0
#define USB_CFG_DESCR_PROPS_HID_REPORT 0
#define USB_CFG_DESCR_PROPS_UNKNOWN 0
#define usbMsgPtr_t unsigned short
/* If usbMsgPtr_t is not defined, it defaults to 'uchar *'. We define it to
* a scalar type here because gcc generates slightly shorter code for scalar
* arithmetics than for pointer arithmetics. Remove this define for backward
* type compatibility or define it to an 8 bit type if you use data in RAM only
* and all RAM is below 256 bytes (tiny memory model in IAR CC).
*/
/* ----------------------- Optional MCU Description ------------------------ */
/* The following configurations have working defaults in usbdrv.h. You
* usually don't need to set them explicitly. Only if you want to run
* the driver on a device which is not yet supported or with a compiler
* which is not fully supported (such as IAR C) or if you use a differnt
* interrupt than INT0, you may have to define some of these.
*/
/* #define USB_INTR_CFG MCUCR */
/* #define USB_INTR_CFG_SET ((1 << ISC00) | (1 << ISC01)) */
/* #define USB_INTR_CFG_CLR 0 */
/* #define USB_INTR_ENABLE GIMSK */
/* #define USB_INTR_ENABLE_BIT INT0 */
/* #define USB_INTR_PENDING GIFR */
/* #define USB_INTR_PENDING_BIT INTF0 */
/* #define USB_INTR_VECTOR INT0_vect */
#endif /* __usbconfig_h_included__ */

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bootloader/usbdrv/usbdrv.c Normal file
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@ -0,0 +1,628 @@
/* Name: usbdrv.c
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Christian Starkjohann
* Creation Date: 2004-12-29
* Tabsize: 4
* Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
#include "usbdrv.h"
#include "oddebug.h"
/*
General Description:
This module implements the C-part of the USB driver. See usbdrv.h for a
documentation of the entire driver.
*/
/* ------------------------------------------------------------------------- */
/* raw USB registers / interface to assembler code: */
uchar usbRxBuf[2*USB_BUFSIZE]; /* raw RX buffer: PID, 8 bytes data, 2 bytes CRC */
uchar usbInputBufOffset; /* offset in usbRxBuf used for low level receiving */
uchar usbDeviceAddr; /* assigned during enumeration, defaults to 0 */
uchar usbNewDeviceAddr; /* device ID which should be set after status phase */
uchar usbConfiguration; /* currently selected configuration. Administered by driver, but not used */
volatile schar usbRxLen; /* = 0; number of bytes in usbRxBuf; 0 means free, -1 for flow control */
uchar usbCurrentTok; /* last token received or endpoint number for last OUT token if != 0 */
uchar usbRxToken; /* token for data we received; or endpont number for last OUT */
volatile uchar usbTxLen = USBPID_NAK; /* number of bytes to transmit with next IN token or handshake token */
uchar usbTxBuf[USB_BUFSIZE];/* data to transmit with next IN, free if usbTxLen contains handshake token */
#if USB_COUNT_SOF
volatile uchar usbSofCount; /* incremented by assembler module every SOF */
#endif
#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
usbTxStatus_t usbTxStatus1;
# if USB_CFG_HAVE_INTRIN_ENDPOINT3
usbTxStatus_t usbTxStatus3;
# endif
#endif
#if USB_CFG_CHECK_DATA_TOGGLING
uchar usbCurrentDataToken;/* when we check data toggling to ignore duplicate packets */
#endif
/* USB status registers / not shared with asm code */
usbMsgPtr_t usbMsgPtr; /* data to transmit next -- ROM or RAM address */
static usbMsgLen_t usbMsgLen = USB_NO_MSG; /* remaining number of bytes */
static uchar usbMsgFlags; /* flag values see below */
#define USB_FLG_MSGPTR_IS_ROM (1<<6)
#define USB_FLG_USE_USER_RW (1<<7)
/*
optimizing hints:
- do not post/pre inc/dec integer values in operations
- assign value of USB_READ_FLASH() to register variables and don't use side effects in arg
- use narrow scope for variables which should be in X/Y/Z register
- assign char sized expressions to variables to force 8 bit arithmetics
*/
/* -------------------------- String Descriptors --------------------------- */
#if USB_CFG_DESCR_PROPS_STRINGS == 0
#if USB_CFG_DESCR_PROPS_STRING_0 == 0
#undef USB_CFG_DESCR_PROPS_STRING_0
#define USB_CFG_DESCR_PROPS_STRING_0 sizeof(usbDescriptorString0)
PROGMEM const char usbDescriptorString0[] = { /* language descriptor */
4, /* sizeof(usbDescriptorString0): length of descriptor in bytes */
3, /* descriptor type */
0x09, 0x04, /* language index (0x0409 = US-English) */
};
#endif
#if USB_CFG_DESCR_PROPS_STRING_VENDOR == 0 && USB_CFG_VENDOR_NAME_LEN
#undef USB_CFG_DESCR_PROPS_STRING_VENDOR
#define USB_CFG_DESCR_PROPS_STRING_VENDOR sizeof(usbDescriptorStringVendor)
PROGMEM const int usbDescriptorStringVendor[] = {
USB_STRING_DESCRIPTOR_HEADER(USB_CFG_VENDOR_NAME_LEN),
USB_CFG_VENDOR_NAME
};
#endif
#if USB_CFG_DESCR_PROPS_STRING_PRODUCT == 0 && USB_CFG_DEVICE_NAME_LEN
#undef USB_CFG_DESCR_PROPS_STRING_PRODUCT
#define USB_CFG_DESCR_PROPS_STRING_PRODUCT sizeof(usbDescriptorStringDevice)
PROGMEM const int usbDescriptorStringDevice[] = {
USB_STRING_DESCRIPTOR_HEADER(USB_CFG_DEVICE_NAME_LEN),
USB_CFG_DEVICE_NAME
};
#endif
#if USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER == 0 && USB_CFG_SERIAL_NUMBER_LEN
#undef USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER
#define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER sizeof(usbDescriptorStringSerialNumber)
PROGMEM const int usbDescriptorStringSerialNumber[] = {
USB_STRING_DESCRIPTOR_HEADER(USB_CFG_SERIAL_NUMBER_LEN),
USB_CFG_SERIAL_NUMBER
};
#endif
#endif /* USB_CFG_DESCR_PROPS_STRINGS == 0 */
/* --------------------------- Device Descriptor --------------------------- */
#if USB_CFG_DESCR_PROPS_DEVICE == 0
#undef USB_CFG_DESCR_PROPS_DEVICE
#define USB_CFG_DESCR_PROPS_DEVICE sizeof(usbDescriptorDevice)
PROGMEM const char usbDescriptorDevice[] = { /* USB device descriptor */
18, /* sizeof(usbDescriptorDevice): length of descriptor in bytes */
USBDESCR_DEVICE, /* descriptor type */
0x10, 0x01, /* USB version supported */
USB_CFG_DEVICE_CLASS,
USB_CFG_DEVICE_SUBCLASS,
0, /* protocol */
8, /* max packet size */
/* the following two casts affect the first byte of the constant only, but
* that's sufficient to avoid a warning with the default values.
*/
(char)USB_CFG_VENDOR_ID,/* 2 bytes */
(char)USB_CFG_DEVICE_ID,/* 2 bytes */
USB_CFG_DEVICE_VERSION, /* 2 bytes */
USB_CFG_DESCR_PROPS_STRING_VENDOR != 0 ? 1 : 0, /* manufacturer string index */
USB_CFG_DESCR_PROPS_STRING_PRODUCT != 0 ? 2 : 0, /* product string index */
USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER != 0 ? 3 : 0, /* serial number string index */
1, /* number of configurations */
};
#endif
/* ----------------------- Configuration Descriptor ------------------------ */
#if USB_CFG_DESCR_PROPS_HID_REPORT != 0 && USB_CFG_DESCR_PROPS_HID == 0
#undef USB_CFG_DESCR_PROPS_HID
#define USB_CFG_DESCR_PROPS_HID 9 /* length of HID descriptor in config descriptor below */
#endif
#if USB_CFG_DESCR_PROPS_CONFIGURATION == 0
#undef USB_CFG_DESCR_PROPS_CONFIGURATION
#define USB_CFG_DESCR_PROPS_CONFIGURATION sizeof(usbDescriptorConfiguration)
PROGMEM const char usbDescriptorConfiguration[] = { /* USB configuration descriptor */
9, /* sizeof(usbDescriptorConfiguration): length of descriptor in bytes */
USBDESCR_CONFIG, /* descriptor type */
18 + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT3 +
(USB_CFG_DESCR_PROPS_HID & 0xff), 0,
/* total length of data returned (including inlined descriptors) */
1, /* number of interfaces in this configuration */
1, /* index of this configuration */
0, /* configuration name string index */
#if USB_CFG_IS_SELF_POWERED
(1 << 7) | USBATTR_SELFPOWER, /* attributes */
#else
(1 << 7), /* attributes */
#endif
USB_CFG_MAX_BUS_POWER/2, /* max USB current in 2mA units */
/* interface descriptor follows inline: */
9, /* sizeof(usbDescrInterface): length of descriptor in bytes */
USBDESCR_INTERFACE, /* descriptor type */
0, /* index of this interface */
0, /* alternate setting for this interface */
USB_CFG_HAVE_INTRIN_ENDPOINT + USB_CFG_HAVE_INTRIN_ENDPOINT3, /* endpoints excl 0: number of endpoint descriptors to follow */
USB_CFG_INTERFACE_CLASS,
USB_CFG_INTERFACE_SUBCLASS,
USB_CFG_INTERFACE_PROTOCOL,
0, /* string index for interface */
#if (USB_CFG_DESCR_PROPS_HID & 0xff) /* HID descriptor */
9, /* sizeof(usbDescrHID): length of descriptor in bytes */
USBDESCR_HID, /* descriptor type: HID */
0x01, 0x01, /* BCD representation of HID version */
0x00, /* target country code */
0x01, /* number of HID Report (or other HID class) Descriptor infos to follow */
0x22, /* descriptor type: report */
USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH, 0, /* total length of report descriptor */
#endif
#if USB_CFG_HAVE_INTRIN_ENDPOINT /* endpoint descriptor for endpoint 1 */
7, /* sizeof(usbDescrEndpoint) */
USBDESCR_ENDPOINT, /* descriptor type = endpoint */
(char)0x81, /* IN endpoint number 1 */
0x03, /* attrib: Interrupt endpoint */
8, 0, /* maximum packet size */
USB_CFG_INTR_POLL_INTERVAL, /* in ms */
#endif
#if USB_CFG_HAVE_INTRIN_ENDPOINT3 /* endpoint descriptor for endpoint 3 */
7, /* sizeof(usbDescrEndpoint) */
USBDESCR_ENDPOINT, /* descriptor type = endpoint */
(char)(0x80 | USB_CFG_EP3_NUMBER), /* IN endpoint number 3 */
0x03, /* attrib: Interrupt endpoint */
8, 0, /* maximum packet size */
USB_CFG_INTR_POLL_INTERVAL, /* in ms */
#endif
};
#endif
/* ------------------------------------------------------------------------- */
static inline void usbResetDataToggling(void)
{
#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
USB_SET_DATATOKEN1(USB_INITIAL_DATATOKEN); /* reset data toggling for interrupt endpoint */
# if USB_CFG_HAVE_INTRIN_ENDPOINT3
USB_SET_DATATOKEN3(USB_INITIAL_DATATOKEN); /* reset data toggling for interrupt endpoint */
# endif
#endif
}
static inline void usbResetStall(void)
{
#if USB_CFG_IMPLEMENT_HALT && USB_CFG_HAVE_INTRIN_ENDPOINT
usbTxLen1 = USBPID_NAK;
#if USB_CFG_HAVE_INTRIN_ENDPOINT3
usbTxLen3 = USBPID_NAK;
#endif
#endif
}
/* ------------------------------------------------------------------------- */
#if !USB_CFG_SUPPRESS_INTR_CODE
#if USB_CFG_HAVE_INTRIN_ENDPOINT
static void usbGenericSetInterrupt(uchar *data, uchar len, usbTxStatus_t *txStatus)
{
uchar *p;
char i;
#if USB_CFG_IMPLEMENT_HALT
if(usbTxLen1 == USBPID_STALL)
return;
#endif
if(txStatus->len & 0x10){ /* packet buffer was empty */
txStatus->buffer[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* toggle token */
}else{
txStatus->len = USBPID_NAK; /* avoid sending outdated (overwritten) interrupt data */
}
p = txStatus->buffer + 1;
i = len;
do{ /* if len == 0, we still copy 1 byte, but that's no problem */
*p++ = *data++;
}while(--i > 0); /* loop control at the end is 2 bytes shorter than at beginning */
usbCrc16Append(&txStatus->buffer[1], len);
txStatus->len = len + 4; /* len must be given including sync byte */
DBG2(0x21 + (((int)txStatus >> 3) & 3), txStatus->buffer, len + 3);
}
USB_PUBLIC void usbSetInterrupt(uchar *data, uchar len)
{
usbGenericSetInterrupt(data, len, &usbTxStatus1);
}
#endif
#if USB_CFG_HAVE_INTRIN_ENDPOINT3
USB_PUBLIC void usbSetInterrupt3(uchar *data, uchar len)
{
usbGenericSetInterrupt(data, len, &usbTxStatus3);
}
#endif
#endif /* USB_CFG_SUPPRESS_INTR_CODE */
/* ------------------ utilities for code following below ------------------- */
/* Use defines for the switch statement so that we can choose between an
* if()else if() and a switch/case based implementation. switch() is more
* efficient for a LARGE set of sequential choices, if() is better in all other
* cases.
*/
#if USB_CFG_USE_SWITCH_STATEMENT
# define SWITCH_START(cmd) switch(cmd){{
# define SWITCH_CASE(value) }break; case (value):{
# define SWITCH_CASE2(v1,v2) }break; case (v1): case(v2):{
# define SWITCH_CASE3(v1,v2,v3) }break; case (v1): case(v2): case(v3):{
# define SWITCH_DEFAULT }break; default:{
# define SWITCH_END }}
#else
# define SWITCH_START(cmd) {uchar _cmd = cmd; if(0){
# define SWITCH_CASE(value) }else if(_cmd == (value)){
# define SWITCH_CASE2(v1,v2) }else if(_cmd == (v1) || _cmd == (v2)){
# define SWITCH_CASE3(v1,v2,v3) }else if(_cmd == (v1) || _cmd == (v2) || (_cmd == v3)){
# define SWITCH_DEFAULT }else{
# define SWITCH_END }}
#endif
#ifndef USB_RX_USER_HOOK
#define USB_RX_USER_HOOK(data, len)
#endif
#ifndef USB_SET_ADDRESS_HOOK
#define USB_SET_ADDRESS_HOOK()
#endif
/* ------------------------------------------------------------------------- */
/* We use if() instead of #if in the macro below because #if can't be used
* in macros and the compiler optimizes constant conditions anyway.
* This may cause problems with undefined symbols if compiled without
* optimizing!
*/
#define GET_DESCRIPTOR(cfgProp, staticName) \
if(cfgProp){ \
if((cfgProp) & USB_PROP_IS_RAM) \
flags = 0; \
if((cfgProp) & USB_PROP_IS_DYNAMIC){ \
len = usbFunctionDescriptor(rq); \
}else{ \
len = USB_PROP_LENGTH(cfgProp); \
usbMsgPtr = (usbMsgPtr_t)(staticName); \
} \
}
/* usbDriverDescriptor() is similar to usbFunctionDescriptor(), but used
* internally for all types of descriptors.
*/
static inline usbMsgLen_t usbDriverDescriptor(usbRequest_t *rq)
{
usbMsgLen_t len = 0;
uchar flags = USB_FLG_MSGPTR_IS_ROM;
SWITCH_START(rq->wValue.bytes[1])
SWITCH_CASE(USBDESCR_DEVICE) /* 1 */
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_DEVICE, usbDescriptorDevice)
SWITCH_CASE(USBDESCR_CONFIG) /* 2 */
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_CONFIGURATION, usbDescriptorConfiguration)
SWITCH_CASE(USBDESCR_STRING) /* 3 */
#if USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC
if(USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_RAM)
flags = 0;
len = usbFunctionDescriptor(rq);
#else /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */
SWITCH_START(rq->wValue.bytes[0])
SWITCH_CASE(0)
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_0, usbDescriptorString0)
SWITCH_CASE(1)
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_VENDOR, usbDescriptorStringVendor)
SWITCH_CASE(2)
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_PRODUCT, usbDescriptorStringDevice)
SWITCH_CASE(3)
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER, usbDescriptorStringSerialNumber)
SWITCH_DEFAULT
if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){
len = usbFunctionDescriptor(rq);
}
SWITCH_END
#endif /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */
#if USB_CFG_DESCR_PROPS_HID_REPORT /* only support HID descriptors if enabled */
SWITCH_CASE(USBDESCR_HID) /* 0x21 */
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID, usbDescriptorConfiguration + 18)
SWITCH_CASE(USBDESCR_HID_REPORT)/* 0x22 */
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID_REPORT, usbDescriptorHidReport)
#endif
SWITCH_DEFAULT
if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){
len = usbFunctionDescriptor(rq);
}
SWITCH_END
usbMsgFlags = flags;
return len;
}
/* ------------------------------------------------------------------------- */
/* usbDriverSetup() is similar to usbFunctionSetup(), but it's used for
* standard requests instead of class and custom requests.
*/
static inline usbMsgLen_t usbDriverSetup(usbRequest_t *rq)
{
usbMsgLen_t len = 0;
uchar *dataPtr = usbTxBuf + 9; /* there are 2 bytes free space at the end of the buffer */
uchar value = rq->wValue.bytes[0];
#if USB_CFG_IMPLEMENT_HALT
uchar index = rq->wIndex.bytes[0];
#endif
dataPtr[0] = 0; /* default reply common to USBRQ_GET_STATUS and USBRQ_GET_INTERFACE */
SWITCH_START(rq->bRequest)
SWITCH_CASE(USBRQ_GET_STATUS) /* 0 */
uchar recipient = rq->bmRequestType & USBRQ_RCPT_MASK; /* assign arith ops to variables to enforce byte size */
if(USB_CFG_IS_SELF_POWERED && recipient == USBRQ_RCPT_DEVICE)
dataPtr[0] = USB_CFG_IS_SELF_POWERED;
#if USB_CFG_IMPLEMENT_HALT
if(recipient == USBRQ_RCPT_ENDPOINT && index == 0x81) /* request status for endpoint 1 */
dataPtr[0] = usbTxLen1 == USBPID_STALL;
#endif
dataPtr[1] = 0;
len = 2;
#if USB_CFG_IMPLEMENT_HALT
SWITCH_CASE2(USBRQ_CLEAR_FEATURE, USBRQ_SET_FEATURE) /* 1, 3 */
if(value == 0 && index == 0x81){ /* feature 0 == HALT for endpoint == 1 */
usbTxLen1 = rq->bRequest == USBRQ_CLEAR_FEATURE ? USBPID_NAK : USBPID_STALL;
usbResetDataToggling();
}
#endif
SWITCH_CASE(USBRQ_SET_ADDRESS) /* 5 */
usbNewDeviceAddr = value;
USB_SET_ADDRESS_HOOK();
SWITCH_CASE(USBRQ_GET_DESCRIPTOR) /* 6 */
len = usbDriverDescriptor(rq);
goto skipMsgPtrAssignment;
SWITCH_CASE(USBRQ_GET_CONFIGURATION) /* 8 */
dataPtr = &usbConfiguration; /* send current configuration value */
len = 1;
SWITCH_CASE(USBRQ_SET_CONFIGURATION) /* 9 */
usbConfiguration = value;
usbResetStall();
SWITCH_CASE(USBRQ_GET_INTERFACE) /* 10 */
len = 1;
#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
SWITCH_CASE(USBRQ_SET_INTERFACE) /* 11 */
usbResetDataToggling();
usbResetStall();
#endif
SWITCH_DEFAULT /* 7=SET_DESCRIPTOR, 12=SYNC_FRAME */
/* Should we add an optional hook here? */
SWITCH_END
usbMsgPtr = (usbMsgPtr_t)dataPtr;
skipMsgPtrAssignment:
return len;
}
/* ------------------------------------------------------------------------- */
/* usbProcessRx() is called for every message received by the interrupt
* routine. It distinguishes between SETUP and DATA packets and processes
* them accordingly.
*/
static inline void usbProcessRx(uchar *data, uchar len)
{
usbRequest_t *rq = (void *)data;
/* usbRxToken can be:
* 0x2d 00101101 (USBPID_SETUP for setup data)
* 0xe1 11100001 (USBPID_OUT: data phase of setup transfer)
* 0...0x0f for OUT on endpoint X
*/
DBG2(0x10 + (usbRxToken & 0xf), data, len + 2); /* SETUP=1d, SETUP-DATA=11, OUTx=1x */
USB_RX_USER_HOOK(data, len)
#if USB_CFG_IMPLEMENT_FN_WRITEOUT
if(usbRxToken < 0x10){ /* OUT to endpoint != 0: endpoint number in usbRxToken */
usbFunctionWriteOut(data, len);
return;
}
#endif
if(usbRxToken == (uchar)USBPID_SETUP){
if(len != 8) /* Setup size must be always 8 bytes. Ignore otherwise. */
return;
usbMsgLen_t replyLen;
usbTxBuf[0] = USBPID_DATA0; /* initialize data toggling */
usbTxLen = USBPID_NAK; /* abort pending transmit */
usbMsgFlags = 0;
uchar type = rq->bmRequestType & USBRQ_TYPE_MASK;
if(type != USBRQ_TYPE_STANDARD){ /* standard requests are handled by driver */
replyLen = usbFunctionSetup(data);
}else{
replyLen = usbDriverSetup(rq);
}
#if USB_CFG_IMPLEMENT_FN_READ || USB_CFG_IMPLEMENT_FN_WRITE
if(replyLen == USB_NO_MSG){ /* use user-supplied read/write function */
/* do some conditioning on replyLen, but on IN transfers only */
if((rq->bmRequestType & USBRQ_DIR_MASK) != USBRQ_DIR_HOST_TO_DEVICE){
if(sizeof(replyLen) < sizeof(rq->wLength.word)){ /* help compiler with optimizing */
replyLen = rq->wLength.bytes[0];
}else{
replyLen = rq->wLength.word;
}
}
usbMsgFlags = USB_FLG_USE_USER_RW;
}else /* The 'else' prevents that we limit a replyLen of USB_NO_MSG to the maximum transfer len. */
#endif
if(sizeof(replyLen) < sizeof(rq->wLength.word)){ /* help compiler with optimizing */
if(!rq->wLength.bytes[1] && replyLen > rq->wLength.bytes[0]) /* limit length to max */
replyLen = rq->wLength.bytes[0];
}else{
if(replyLen > rq->wLength.word) /* limit length to max */
replyLen = rq->wLength.word;
}
usbMsgLen = replyLen;
}else{ /* usbRxToken must be USBPID_OUT, which means data phase of setup (control-out) */
#if USB_CFG_IMPLEMENT_FN_WRITE
if(usbMsgFlags & USB_FLG_USE_USER_RW){
uchar rval = usbFunctionWrite(data, len);
if(rval == 0xff){ /* an error occurred */
usbTxLen = USBPID_STALL;
}else if(rval != 0){ /* This was the final package */
usbMsgLen = 0; /* answer with a zero-sized data packet */
}
}
#endif
}
}
/* ------------------------------------------------------------------------- */
/* This function is similar to usbFunctionRead(), but it's also called for
* data handled automatically by the driver (e.g. descriptor reads).
*/
static uchar usbDeviceRead(uchar *data, uchar len)
{
if(len > 0){ /* don't bother app with 0 sized reads */
#if USB_CFG_IMPLEMENT_FN_READ
if(usbMsgFlags & USB_FLG_USE_USER_RW){
len = usbFunctionRead(data, len);
}else
#endif
{
uchar i = len;
usbMsgPtr_t r = usbMsgPtr;
if(usbMsgFlags & USB_FLG_MSGPTR_IS_ROM){ /* ROM data */
do{
uchar c = USB_READ_FLASH(r); /* assign to char size variable to enforce byte ops */
*data++ = c;
r++;
}while(--i);
}else{ /* RAM data */
do{
*data++ = *((uchar *)r);
r++;
}while(--i);
}
usbMsgPtr = r;
}
}
return len;
}
/* ------------------------------------------------------------------------- */
/* usbBuildTxBlock() is called when we have data to transmit and the
* interrupt routine's transmit buffer is empty.
*/
static inline void usbBuildTxBlock(void)
{
usbMsgLen_t wantLen;
uchar len;
wantLen = usbMsgLen;
if(wantLen > 8)
wantLen = 8;
usbMsgLen -= wantLen;
usbTxBuf[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* DATA toggling */
len = usbDeviceRead(usbTxBuf + 1, wantLen);
if(len <= 8){ /* valid data packet */
usbCrc16Append(&usbTxBuf[1], len);
len += 4; /* length including sync byte */
if(len < 12) /* a partial package identifies end of message */
usbMsgLen = USB_NO_MSG;
}else{
len = USBPID_STALL; /* stall the endpoint */
usbMsgLen = USB_NO_MSG;
}
usbTxLen = len;
DBG2(0x20, usbTxBuf, len-1);
}
/* ------------------------------------------------------------------------- */
static inline void usbHandleResetHook(uchar notResetState)
{
#ifdef USB_RESET_HOOK
static uchar wasReset;
uchar isReset = !notResetState;
if(wasReset != isReset){
USB_RESET_HOOK(isReset);
wasReset = isReset;
}
#else
notResetState = notResetState; // avoid compiler warning
#endif
}
/* ------------------------------------------------------------------------- */
USB_PUBLIC void usbPoll(void)
{
schar len;
uchar i;
len = usbRxLen - 3;
if(len >= 0){
/* We could check CRC16 here -- but ACK has already been sent anyway. If you
* need data integrity checks with this driver, check the CRC in your app
* code and report errors back to the host. Since the ACK was already sent,
* retries must be handled on application level.
* unsigned crc = usbCrc16(buffer + 1, usbRxLen - 3);
*/
usbProcessRx(usbRxBuf + USB_BUFSIZE + 1 - usbInputBufOffset, len);
#if USB_CFG_HAVE_FLOWCONTROL
if(usbRxLen > 0) /* only mark as available if not inactivated */
usbRxLen = 0;
#else
usbRxLen = 0; /* mark rx buffer as available */
#endif
}
if(usbTxLen & 0x10){ /* transmit system idle */
if(usbMsgLen != USB_NO_MSG){ /* transmit data pending? */
usbBuildTxBlock();
}
}
for(i = 20; i > 0; i--){
uchar usbLineStatus = USBIN & USBMASK;
if(usbLineStatus != 0) /* SE0 has ended */
goto isNotReset;
}
/* RESET condition, called multiple times during reset */
usbNewDeviceAddr = 0;
usbDeviceAddr = 0;
usbResetStall();
DBG1(0xff, 0, 0);
isNotReset:
usbHandleResetHook(i);
}
/* ------------------------------------------------------------------------- */
USB_PUBLIC void usbInit(void)
{
#if USB_INTR_CFG_SET != 0
USB_INTR_CFG |= USB_INTR_CFG_SET;
#endif
#if USB_INTR_CFG_CLR != 0
USB_INTR_CFG &= ~(USB_INTR_CFG_CLR);
#endif
USB_INTR_ENABLE |= (1 << USB_INTR_ENABLE_BIT);
usbResetDataToggling();
#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
usbTxLen1 = USBPID_NAK;
#if USB_CFG_HAVE_INTRIN_ENDPOINT3
usbTxLen3 = USBPID_NAK;
#endif
#endif
}
/* ------------------------------------------------------------------------- */

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/* Name: usbdrv.h
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Christian Starkjohann
* Creation Date: 2004-12-29
* Tabsize: 4
* Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
#ifndef __usbdrv_h_included__
#define __usbdrv_h_included__
#include "usbconfig.h"
#include "usbportability.h"
/*
Hardware Prerequisites:
=======================
USB lines D+ and D- MUST be wired to the same I/O port. We recommend that D+
triggers the interrupt (best achieved by using INT0 for D+), but it is also
possible to trigger the interrupt from D-. If D- is used, interrupts are also
triggered by SOF packets. D- requires a pull-up of 1.5k to +3.5V (and the
device must be powered at 3.5V) to identify as low-speed USB device. A
pull-down or pull-up of 1M SHOULD be connected from D+ to +3.5V to prevent
interference when no USB master is connected. If you use Zener diodes to limit
the voltage on D+ and D-, you MUST use a pull-down resistor, not a pull-up.
We use D+ as interrupt source and not D- because it does not trigger on
keep-alive and RESET states. If you want to count keep-alive events with
USB_COUNT_SOF, you MUST use D- as an interrupt source.
As a compile time option, the 1.5k pull-up resistor on D- can be made
switchable to allow the device to disconnect at will. See the definition of
usbDeviceConnect() and usbDeviceDisconnect() further down in this file.
Please adapt the values in usbconfig.h according to your hardware!
The device MUST be clocked at exactly 12 MHz, 15 MHz, 16 MHz or 20 MHz
or at 12.8 MHz resp. 16.5 MHz +/- 1%. See usbconfig-prototype.h for details.
Limitations:
============
Robustness with respect to communication errors:
The driver assumes error-free communication. It DOES check for errors in
the PID, but does NOT check bit stuffing errors, SE0 in middle of a byte,
token CRC (5 bit) and data CRC (16 bit). CRC checks can not be performed due
to timing constraints: We must start sending a reply within 7 bit times.
Bit stuffing and misplaced SE0 would have to be checked in real-time, but CPU
performance does not permit that. The driver does not check Data0/Data1
toggling, but application software can implement the check.
Input characteristics:
Since no differential receiver circuit is used, electrical interference
robustness may suffer. The driver samples only one of the data lines with
an ordinary I/O pin's input characteristics. However, since this is only a
low speed USB implementation and the specification allows for 8 times the
bit rate over the same hardware, we should be on the safe side. Even the spec
requires detection of asymmetric states at high bit rate for SE0 detection.
Number of endpoints:
The driver supports the following endpoints:
- Endpoint 0, the default control endpoint.
- Any number of interrupt- or bulk-out endpoints. The data is sent to
usbFunctionWriteOut() and USB_CFG_IMPLEMENT_FN_WRITEOUT must be defined
to 1 to activate this feature. The endpoint number can be found in the
global variable 'usbRxToken'.
- One default interrupt- or bulk-in endpoint. This endpoint is used for
interrupt- or bulk-in transfers which are not handled by any other endpoint.
You must define USB_CFG_HAVE_INTRIN_ENDPOINT in order to activate this
feature and call usbSetInterrupt() to send interrupt/bulk data.
- One additional interrupt- or bulk-in endpoint. This was endpoint 3 in
previous versions of this driver but can now be configured to any endpoint
number. You must define USB_CFG_HAVE_INTRIN_ENDPOINT3 in order to activate
this feature and call usbSetInterrupt3() to send interrupt/bulk data. The
endpoint number can be set with USB_CFG_EP3_NUMBER.
Please note that the USB standard forbids bulk endpoints for low speed devices!
Most operating systems allow them anyway, but the AVR will spend 90% of the CPU
time in the USB interrupt polling for bulk data.
Maximum data payload:
Data payload of control in and out transfers may be up to 254 bytes. In order
to accept payload data of out transfers, you need to implement
'usbFunctionWrite()'.
USB Suspend Mode supply current:
The USB standard limits power consumption to 500uA when the bus is in suspend
mode. This is not a problem for self-powered devices since they don't need
bus power anyway. Bus-powered devices can achieve this only by putting the
CPU in sleep mode. The driver does not implement suspend handling by itself.
However, the application may implement activity monitoring and wakeup from
sleep. The host sends regular SE0 states on the bus to keep it active. These
SE0 states can be detected by using D- as the interrupt source. Define
USB_COUNT_SOF to 1 and use the global variable usbSofCount to check for bus
activity.
Operation without an USB master:
The driver behaves neutral without connection to an USB master if D- reads
as 1. To avoid spurious interrupts, we recommend a high impedance (e.g. 1M)
pull-down or pull-up resistor on D+ (interrupt). If Zener diodes are used,
use a pull-down. If D- becomes statically 0, the driver may block in the
interrupt routine.
Interrupt latency:
The application must ensure that the USB interrupt is not disabled for more
than 25 cycles (this is for 12 MHz, faster clocks allow longer latency).
This implies that all interrupt routines must either have the "ISR_NOBLOCK"
attribute set (see "avr/interrupt.h") or be written in assembler with "sei"
as the first instruction.
Maximum interrupt duration / CPU cycle consumption:
The driver handles all USB communication during the interrupt service
routine. The routine will not return before an entire USB message is received
and the reply is sent. This may be up to ca. 1200 cycles @ 12 MHz (= 100us) if
the host conforms to the standard. The driver will consume CPU cycles for all
USB messages, even if they address another (low-speed) device on the same bus.
*/
/* ------------------------------------------------------------------------- */
/* --------------------------- Module Interface ---------------------------- */
/* ------------------------------------------------------------------------- */
#define USBDRV_VERSION 20121206
/* This define uniquely identifies a driver version. It is a decimal number
* constructed from the driver's release date in the form YYYYMMDD. If the
* driver's behavior or interface changes, you can use this constant to
* distinguish versions. If it is not defined, the driver's release date is
* older than 2006-01-25.
*/
#ifndef USB_PUBLIC
#define USB_PUBLIC
#endif
/* USB_PUBLIC is used as declaration attribute for all functions exported by
* the USB driver. The default is no attribute (see above). You may define it
* to static either in usbconfig.h or from the command line if you include
* usbdrv.c instead of linking against it. Including the C module of the driver
* directly in your code saves a couple of bytes in flash memory.
*/
#ifndef __ASSEMBLER__
#ifndef uchar
#define uchar unsigned char
#endif
#ifndef schar
#define schar signed char
#endif
/* shortcuts for well defined 8 bit integer types */
#if USB_CFG_LONG_TRANSFERS /* if more than 254 bytes transfer size required */
# define usbMsgLen_t unsigned
#else
# define usbMsgLen_t uchar
#endif
/* usbMsgLen_t is the data type used for transfer lengths. By default, it is
* defined to uchar, allowing a maximum of 254 bytes (255 is reserved for
* USB_NO_MSG below). If the usbconfig.h defines USB_CFG_LONG_TRANSFERS to 1,
* a 16 bit data type is used, allowing up to 16384 bytes (the rest is used
* for flags in the descriptor configuration).
*/
#define USB_NO_MSG ((usbMsgLen_t)-1) /* constant meaning "no message" */
#ifndef usbMsgPtr_t
#define usbMsgPtr_t uchar *
#endif
/* Making usbMsgPtr_t a define allows the user of this library to define it to
* an 8 bit type on tiny devices. This reduces code size, especially if the
* compiler supports a tiny memory model.
* The type can be a pointer or scalar type, casts are made where necessary.
* Although it's paradoxical, Gcc 4 generates slightly better code for scalar
* types than for pointers.
*/
struct usbRequest; /* forward declaration */
USB_PUBLIC void usbInit(void);
/* This function must be called before interrupts are enabled and the main
* loop is entered. We exepct that the PORT and DDR bits for D+ and D- have
* not been changed from their default status (which is 0). If you have changed
* them, set both back to 0 (configure them as input with no internal pull-up).
*/
USB_PUBLIC void usbPoll(void);
/* This function must be called at regular intervals from the main loop.
* Maximum delay between calls is somewhat less than 50ms (USB timeout for
* accepting a Setup message). Otherwise the device will not be recognized.
* Please note that debug outputs through the UART take ~ 0.5ms per byte
* at 19200 bps.
*/
extern usbMsgPtr_t usbMsgPtr;
/* This variable may be used to pass transmit data to the driver from the
* implementation of usbFunctionWrite(). It is also used internally by the
* driver for standard control requests.
*/
USB_PUBLIC usbMsgLen_t usbFunctionSetup(uchar data[8]);
/* This function is called when the driver receives a SETUP transaction from
* the host which is not answered by the driver itself (in practice: class and
* vendor requests). All control transfers start with a SETUP transaction where
* the host communicates the parameters of the following (optional) data
* transfer. The SETUP data is available in the 'data' parameter which can
* (and should) be casted to 'usbRequest_t *' for a more user-friendly access
* to parameters.
*
* If the SETUP indicates a control-in transfer, you should provide the
* requested data to the driver. There are two ways to transfer this data:
* (1) Set the global pointer 'usbMsgPtr' to the base of the static RAM data
* block and return the length of the data in 'usbFunctionSetup()'. The driver
* will handle the rest. Or (2) return USB_NO_MSG in 'usbFunctionSetup()'. The
* driver will then call 'usbFunctionRead()' when data is needed. See the
* documentation for usbFunctionRead() for details.
*
* If the SETUP indicates a control-out transfer, the only way to receive the
* data from the host is through the 'usbFunctionWrite()' call. If you
* implement this function, you must return USB_NO_MSG in 'usbFunctionSetup()'
* to indicate that 'usbFunctionWrite()' should be used. See the documentation
* of this function for more information. If you just want to ignore the data
* sent by the host, return 0 in 'usbFunctionSetup()'.
*
* Note that calls to the functions usbFunctionRead() and usbFunctionWrite()
* are only done if enabled by the configuration in usbconfig.h.
*/
USB_PUBLIC usbMsgLen_t usbFunctionDescriptor(struct usbRequest *rq);
/* You need to implement this function ONLY if you provide USB descriptors at
* runtime (which is an expert feature). It is very similar to
* usbFunctionSetup() above, but it is called only to request USB descriptor
* data. See the documentation of usbFunctionSetup() above for more info.
*/
#if USB_CFG_HAVE_INTRIN_ENDPOINT
USB_PUBLIC void usbSetInterrupt(uchar *data, uchar len);
/* This function sets the message which will be sent during the next interrupt
* IN transfer. The message is copied to an internal buffer and must not exceed
* a length of 8 bytes. The message may be 0 bytes long just to indicate the
* interrupt status to the host.
* If you need to transfer more bytes, use a control read after the interrupt.
*/
#define usbInterruptIsReady() (usbTxLen1 & 0x10)
/* This macro indicates whether the last interrupt message has already been
* sent. If you set a new interrupt message before the old was sent, the
* message already buffered will be lost.
*/
#if USB_CFG_HAVE_INTRIN_ENDPOINT3
USB_PUBLIC void usbSetInterrupt3(uchar *data, uchar len);
#define usbInterruptIsReady3() (usbTxLen3 & 0x10)
/* Same as above for endpoint 3 */
#endif
#endif /* USB_CFG_HAVE_INTRIN_ENDPOINT */
#if USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH /* simplified interface for backward compatibility */
#define usbHidReportDescriptor usbDescriptorHidReport
/* should be declared as: PROGMEM char usbHidReportDescriptor[]; */
/* If you implement an HID device, you need to provide a report descriptor.
* The HID report descriptor syntax is a bit complex. If you understand how
* report descriptors are constructed, we recommend that you use the HID
* Descriptor Tool from usb.org, see http://www.usb.org/developers/hidpage/.
* Otherwise you should probably start with a working example.
*/
#endif /* USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH */
#if USB_CFG_IMPLEMENT_FN_WRITE
USB_PUBLIC uchar usbFunctionWrite(uchar *data, uchar len);
/* This function is called by the driver to provide a control transfer's
* payload data (control-out). It is called in chunks of up to 8 bytes. The
* total count provided in the current control transfer can be obtained from
* the 'length' property in the setup data. If an error occurred during
* processing, return 0xff (== -1). The driver will answer the entire transfer
* with a STALL token in this case. If you have received the entire payload
* successfully, return 1. If you expect more data, return 0. If you don't
* know whether the host will send more data (you should know, the total is
* provided in the usbFunctionSetup() call!), return 1.
* NOTE: If you return 0xff for STALL, 'usbFunctionWrite()' may still be called
* for the remaining data. You must continue to return 0xff for STALL in these
* calls.
* In order to get usbFunctionWrite() called, define USB_CFG_IMPLEMENT_FN_WRITE
* to 1 in usbconfig.h and return 0xff in usbFunctionSetup()..
*/
#endif /* USB_CFG_IMPLEMENT_FN_WRITE */
#if USB_CFG_IMPLEMENT_FN_READ
USB_PUBLIC uchar usbFunctionRead(uchar *data, uchar len);
/* This function is called by the driver to ask the application for a control
* transfer's payload data (control-in). It is called in chunks of up to 8
* bytes each. You should copy the data to the location given by 'data' and
* return the actual number of bytes copied. If you return less than requested,
* the control-in transfer is terminated. If you return 0xff, the driver aborts
* the transfer with a STALL token.
* In order to get usbFunctionRead() called, define USB_CFG_IMPLEMENT_FN_READ
* to 1 in usbconfig.h and return 0xff in usbFunctionSetup()..
*/
#endif /* USB_CFG_IMPLEMENT_FN_READ */
extern uchar usbRxToken; /* may be used in usbFunctionWriteOut() below */
#if USB_CFG_IMPLEMENT_FN_WRITEOUT
USB_PUBLIC void usbFunctionWriteOut(uchar *data, uchar len);
/* This function is called by the driver when data is received on an interrupt-
* or bulk-out endpoint. The endpoint number can be found in the global
* variable usbRxToken. You must define USB_CFG_IMPLEMENT_FN_WRITEOUT to 1 in
* usbconfig.h to get this function called.
*/
#endif /* USB_CFG_IMPLEMENT_FN_WRITEOUT */
#ifdef USB_CFG_PULLUP_IOPORTNAME
#define usbDeviceConnect() ((USB_PULLUP_DDR |= (1<<USB_CFG_PULLUP_BIT)), \
(USB_PULLUP_OUT |= (1<<USB_CFG_PULLUP_BIT)))
#define usbDeviceDisconnect() ((USB_PULLUP_DDR &= ~(1<<USB_CFG_PULLUP_BIT)), \
(USB_PULLUP_OUT &= ~(1<<USB_CFG_PULLUP_BIT)))
#else /* USB_CFG_PULLUP_IOPORTNAME */
#define usbDeviceConnect() (USBDDR &= ~(1<<USBMINUS))
#define usbDeviceDisconnect() (USBDDR |= (1<<USBMINUS))
#endif /* USB_CFG_PULLUP_IOPORTNAME */
/* The macros usbDeviceConnect() and usbDeviceDisconnect() (intended to look
* like a function) connect resp. disconnect the device from the host's USB.
* If the constants USB_CFG_PULLUP_IOPORT and USB_CFG_PULLUP_BIT are defined
* in usbconfig.h, a disconnect consists of removing the pull-up resisitor
* from D-, otherwise the disconnect is done by brute-force pulling D- to GND.
* This does not conform to the spec, but it works.
* Please note that the USB interrupt must be disabled while the device is
* in disconnected state, or the interrupt handler will hang! You can either
* turn off the USB interrupt selectively with
* USB_INTR_ENABLE &= ~(1 << USB_INTR_ENABLE_BIT)
* or use cli() to disable interrupts globally.
*/
extern unsigned usbCrc16(unsigned data, uchar len);
#define usbCrc16(data, len) usbCrc16((unsigned)(data), len)
/* This function calculates the binary complement of the data CRC used in
* USB data packets. The value is used to build raw transmit packets.
* You may want to use this function for data checksums or to verify received
* data. We enforce 16 bit calling conventions for compatibility with IAR's
* tiny memory model.
*/
extern unsigned usbCrc16Append(unsigned data, uchar len);
#define usbCrc16Append(data, len) usbCrc16Append((unsigned)(data), len)
/* This function is equivalent to usbCrc16() above, except that it appends
* the 2 bytes CRC (lowbyte first) in the 'data' buffer after reading 'len'
* bytes.
*/
#if USB_CFG_HAVE_MEASURE_FRAME_LENGTH
extern unsigned usbMeasureFrameLength(void);
/* This function MUST be called IMMEDIATELY AFTER USB reset and measures 1/7 of
* the number of CPU cycles during one USB frame minus one low speed bit
* length. In other words: return value = 1499 * (F_CPU / 10.5 MHz)
* Since this is a busy wait, you MUST disable all interrupts with cli() before
* calling this function.
* This can be used to calibrate the AVR's RC oscillator.
*/
#endif
extern uchar usbConfiguration;
/* This value contains the current configuration set by the host. The driver
* allows setting and querying of this variable with the USB SET_CONFIGURATION
* and GET_CONFIGURATION requests, but does not use it otherwise.
* You may want to reflect the "configured" status with a LED on the device or
* switch on high power parts of the circuit only if the device is configured.
*/
#if USB_COUNT_SOF
extern volatile uchar usbSofCount;
/* This variable is incremented on every SOF packet. It is only available if
* the macro USB_COUNT_SOF is defined to a value != 0.
*/
#endif
#if USB_CFG_CHECK_DATA_TOGGLING
extern uchar usbCurrentDataToken;
/* This variable can be checked in usbFunctionWrite() and usbFunctionWriteOut()
* to ignore duplicate packets.
*/
#endif
#define USB_STRING_DESCRIPTOR_HEADER(stringLength) ((2*(stringLength)+2) | (3<<8))
/* This macro builds a descriptor header for a string descriptor given the
* string's length. See usbdrv.c for an example how to use it.
*/
#if USB_CFG_HAVE_FLOWCONTROL
extern volatile schar usbRxLen;
#define usbDisableAllRequests() usbRxLen = -1
/* Must be called from usbFunctionWrite(). This macro disables all data input
* from the USB interface. Requests from the host are answered with a NAK
* while they are disabled.
*/
#define usbEnableAllRequests() usbRxLen = 0
/* May only be called if requests are disabled. This macro enables input from
* the USB interface after it has been disabled with usbDisableAllRequests().
*/
#define usbAllRequestsAreDisabled() (usbRxLen < 0)
/* Use this macro to find out whether requests are disabled. It may be needed
* to ensure that usbEnableAllRequests() is never called when requests are
* enabled.
*/
#endif
#define USB_SET_DATATOKEN1(token) usbTxBuf1[0] = token
#define USB_SET_DATATOKEN3(token) usbTxBuf3[0] = token
/* These two macros can be used by application software to reset data toggling
* for interrupt-in endpoints 1 and 3. Since the token is toggled BEFORE
* sending data, you must set the opposite value of the token which should come
* first.
*/
#endif /* __ASSEMBLER__ */
/* ------------------------------------------------------------------------- */
/* ----------------- Definitions for Descriptor Properties ----------------- */
/* ------------------------------------------------------------------------- */
/* This is advanced stuff. See usbconfig-prototype.h for more information
* about the various methods to define USB descriptors. If you do nothing,
* the default descriptors will be used.
*/
#define USB_PROP_IS_DYNAMIC (1u << 14)
/* If this property is set for a descriptor, usbFunctionDescriptor() will be
* used to obtain the particular descriptor. Data directly returned via
* usbMsgPtr are FLASH data by default, combine (OR) with USB_PROP_IS_RAM to
* return RAM data.
*/
#define USB_PROP_IS_RAM (1u << 15)
/* If this property is set for a descriptor, the data is read from RAM
* memory instead of Flash. The property is used for all methods to provide
* external descriptors.
*/
#define USB_PROP_LENGTH(len) ((len) & 0x3fff)
/* If a static external descriptor is used, this is the total length of the
* descriptor in bytes.
*/
/* all descriptors which may have properties: */
#ifndef USB_CFG_DESCR_PROPS_DEVICE
#define USB_CFG_DESCR_PROPS_DEVICE 0
#endif
#ifndef USB_CFG_DESCR_PROPS_CONFIGURATION
#define USB_CFG_DESCR_PROPS_CONFIGURATION 0
#endif
#ifndef USB_CFG_DESCR_PROPS_STRINGS
#define USB_CFG_DESCR_PROPS_STRINGS 0
#endif
#ifndef USB_CFG_DESCR_PROPS_STRING_0
#define USB_CFG_DESCR_PROPS_STRING_0 0
#endif
#ifndef USB_CFG_DESCR_PROPS_STRING_VENDOR
#define USB_CFG_DESCR_PROPS_STRING_VENDOR 0
#endif
#ifndef USB_CFG_DESCR_PROPS_STRING_PRODUCT
#define USB_CFG_DESCR_PROPS_STRING_PRODUCT 0
#endif
#ifndef USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER
#define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER 0
#endif
#ifndef USB_CFG_DESCR_PROPS_HID
#define USB_CFG_DESCR_PROPS_HID 0
#endif
#if !(USB_CFG_DESCR_PROPS_HID_REPORT)
# undef USB_CFG_DESCR_PROPS_HID_REPORT
# if USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH /* do some backward compatibility tricks */
# define USB_CFG_DESCR_PROPS_HID_REPORT USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH
# else
# define USB_CFG_DESCR_PROPS_HID_REPORT 0
# endif
#endif
#ifndef USB_CFG_DESCR_PROPS_UNKNOWN
#define USB_CFG_DESCR_PROPS_UNKNOWN 0
#endif
/* ------------------ forward declaration of descriptors ------------------- */
/* If you use external static descriptors, they must be stored in global
* arrays as declared below:
*/
#ifndef __ASSEMBLER__
extern
#if !(USB_CFG_DESCR_PROPS_DEVICE & USB_PROP_IS_RAM)
PROGMEM const
#endif
char usbDescriptorDevice[];
extern
#if !(USB_CFG_DESCR_PROPS_CONFIGURATION & USB_PROP_IS_RAM)
PROGMEM const
#endif
char usbDescriptorConfiguration[];
extern
#if !(USB_CFG_DESCR_PROPS_HID_REPORT & USB_PROP_IS_RAM)
PROGMEM const
#endif
char usbDescriptorHidReport[];
extern
#if !(USB_CFG_DESCR_PROPS_STRING_0 & USB_PROP_IS_RAM)
PROGMEM const
#endif
char usbDescriptorString0[];
extern
#if !(USB_CFG_DESCR_PROPS_STRING_VENDOR & USB_PROP_IS_RAM)
PROGMEM const
#endif
int usbDescriptorStringVendor[];
extern
#if !(USB_CFG_DESCR_PROPS_STRING_PRODUCT & USB_PROP_IS_RAM)
PROGMEM const
#endif
int usbDescriptorStringDevice[];
extern
#if !(USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER & USB_PROP_IS_RAM)
PROGMEM const
#endif
int usbDescriptorStringSerialNumber[];
#endif /* __ASSEMBLER__ */
/* ------------------------------------------------------------------------- */
/* ------------------------ General Purpose Macros ------------------------- */
/* ------------------------------------------------------------------------- */
#define USB_CONCAT(a, b) a ## b
#define USB_CONCAT_EXPANDED(a, b) USB_CONCAT(a, b)
#define USB_OUTPORT(name) USB_CONCAT(PORT, name)
#define USB_INPORT(name) USB_CONCAT(PIN, name)
#define USB_DDRPORT(name) USB_CONCAT(DDR, name)
/* The double-define trick above lets us concatenate strings which are
* defined by macros.
*/
/* ------------------------------------------------------------------------- */
/* ------------------------- Constant definitions -------------------------- */
/* ------------------------------------------------------------------------- */
#if !defined __ASSEMBLER__ && (!defined USB_CFG_VENDOR_ID || !defined USB_CFG_DEVICE_ID)
#warning "You should define USB_CFG_VENDOR_ID and USB_CFG_DEVICE_ID in usbconfig.h"
/* If the user has not defined IDs, we default to obdev's free IDs.
* See USB-IDs-for-free.txt for details.
*/
#endif
/* make sure we have a VID and PID defined, byte order is lowbyte, highbyte */
#ifndef USB_CFG_VENDOR_ID
# define USB_CFG_VENDOR_ID 0xc0, 0x16 /* = 0x16c0 = 5824 = voti.nl */
#endif
#ifndef USB_CFG_DEVICE_ID
# if USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH
# define USB_CFG_DEVICE_ID 0xdf, 0x05 /* = 0x5df = 1503, shared PID for HIDs */
# elif USB_CFG_INTERFACE_CLASS == 2
# define USB_CFG_DEVICE_ID 0xe1, 0x05 /* = 0x5e1 = 1505, shared PID for CDC Modems */
# else
# define USB_CFG_DEVICE_ID 0xdc, 0x05 /* = 0x5dc = 1500, obdev's free PID */
# endif
#endif
/* Derive Output, Input and DataDirection ports from port names */
#ifndef USB_CFG_IOPORTNAME
#error "You must define USB_CFG_IOPORTNAME in usbconfig.h, see usbconfig-prototype.h"
#endif
#define USBOUT USB_OUTPORT(USB_CFG_IOPORTNAME)
#define USB_PULLUP_OUT USB_OUTPORT(USB_CFG_PULLUP_IOPORTNAME)
#define USBIN USB_INPORT(USB_CFG_IOPORTNAME)
#define USBDDR USB_DDRPORT(USB_CFG_IOPORTNAME)
#define USB_PULLUP_DDR USB_DDRPORT(USB_CFG_PULLUP_IOPORTNAME)
#define USBMINUS USB_CFG_DMINUS_BIT
#define USBPLUS USB_CFG_DPLUS_BIT
#define USBIDLE (1<<USB_CFG_DMINUS_BIT) /* value representing J state */
#define USBMASK ((1<<USB_CFG_DPLUS_BIT) | (1<<USB_CFG_DMINUS_BIT)) /* mask for USB I/O bits */
/* defines for backward compatibility with older driver versions: */
#define USB_CFG_IOPORT USB_OUTPORT(USB_CFG_IOPORTNAME)
#ifdef USB_CFG_PULLUP_IOPORTNAME
#define USB_CFG_PULLUP_IOPORT USB_OUTPORT(USB_CFG_PULLUP_IOPORTNAME)
#endif
#ifndef USB_CFG_EP3_NUMBER /* if not defined in usbconfig.h */
#define USB_CFG_EP3_NUMBER 3
#endif
#ifndef USB_CFG_HAVE_INTRIN_ENDPOINT3
#define USB_CFG_HAVE_INTRIN_ENDPOINT3 0
#endif
#define USB_BUFSIZE 11 /* PID, 8 bytes data, 2 bytes CRC */
/* ----- Try to find registers and bits responsible for ext interrupt 0 ----- */
#ifndef USB_INTR_CFG /* allow user to override our default */
# if defined EICRA
# define USB_INTR_CFG EICRA
# else
# define USB_INTR_CFG MCUCR
# endif
#endif
#ifndef USB_INTR_CFG_SET /* allow user to override our default */
# if defined(USB_COUNT_SOF) || defined(USB_SOF_HOOK)
# define USB_INTR_CFG_SET (1 << ISC01) /* cfg for falling edge */
/* If any SOF logic is used, the interrupt must be wired to D- where
* we better trigger on falling edge
*/
# else
# define USB_INTR_CFG_SET ((1 << ISC00) | (1 << ISC01)) /* cfg for rising edge */
# endif
#endif
#ifndef USB_INTR_CFG_CLR /* allow user to override our default */
# define USB_INTR_CFG_CLR 0 /* no bits to clear */
#endif
#ifndef USB_INTR_ENABLE /* allow user to override our default */
# if defined GIMSK
# define USB_INTR_ENABLE GIMSK
# elif defined EIMSK
# define USB_INTR_ENABLE EIMSK
# else
# define USB_INTR_ENABLE GICR
# endif
#endif
#ifndef USB_INTR_ENABLE_BIT /* allow user to override our default */
# define USB_INTR_ENABLE_BIT INT0
#endif
#ifndef USB_INTR_PENDING /* allow user to override our default */
# if defined EIFR
# define USB_INTR_PENDING EIFR
# else
# define USB_INTR_PENDING GIFR
# endif
#endif
#ifndef USB_INTR_PENDING_BIT /* allow user to override our default */
# define USB_INTR_PENDING_BIT INTF0
#endif
/*
The defines above don't work for the following chips
at90c8534: no ISC0?, no PORTB, can't find a data sheet
at86rf401: no PORTB, no MCUCR etc, low clock rate
atmega103: no ISC0? (maybe omission in header, can't find data sheet)
atmega603: not defined in avr-libc
at43usb320, at43usb355, at76c711: have USB anyway
at94k: is different...
at90s1200, attiny11, attiny12, attiny15, attiny28: these have no RAM
*/
/* ------------------------------------------------------------------------- */
/* ----------------- USB Specification Constants and Types ----------------- */
/* ------------------------------------------------------------------------- */
/* USB Token values */
#define USBPID_SETUP 0x2d
#define USBPID_OUT 0xe1
#define USBPID_IN 0x69
#define USBPID_DATA0 0xc3
#define USBPID_DATA1 0x4b
#define USBPID_ACK 0xd2
#define USBPID_NAK 0x5a
#define USBPID_STALL 0x1e
#ifndef USB_INITIAL_DATATOKEN
#define USB_INITIAL_DATATOKEN USBPID_DATA1
#endif
#ifndef __ASSEMBLER__
typedef struct usbTxStatus{
volatile uchar len;
uchar buffer[USB_BUFSIZE];
}usbTxStatus_t;
extern usbTxStatus_t usbTxStatus1, usbTxStatus3;
#define usbTxLen1 usbTxStatus1.len
#define usbTxBuf1 usbTxStatus1.buffer
#define usbTxLen3 usbTxStatus3.len
#define usbTxBuf3 usbTxStatus3.buffer
typedef union usbWord{
unsigned word;
uchar bytes[2];
}usbWord_t;
typedef struct usbRequest{
uchar bmRequestType;
uchar bRequest;
usbWord_t wValue;
usbWord_t wIndex;
usbWord_t wLength;
}usbRequest_t;
/* This structure matches the 8 byte setup request */
#endif
/* bmRequestType field in USB setup:
* d t t r r r r r, where
* d ..... direction: 0=host->device, 1=device->host
* t ..... type: 0=standard, 1=class, 2=vendor, 3=reserved
* r ..... recipient: 0=device, 1=interface, 2=endpoint, 3=other
*/
/* USB setup recipient values */
#define USBRQ_RCPT_MASK 0x1f
#define USBRQ_RCPT_DEVICE 0
#define USBRQ_RCPT_INTERFACE 1
#define USBRQ_RCPT_ENDPOINT 2
/* USB request type values */
#define USBRQ_TYPE_MASK 0x60
#define USBRQ_TYPE_STANDARD (0<<5)
#define USBRQ_TYPE_CLASS (1<<5)
#define USBRQ_TYPE_VENDOR (2<<5)
/* USB direction values: */
#define USBRQ_DIR_MASK 0x80
#define USBRQ_DIR_HOST_TO_DEVICE (0<<7)
#define USBRQ_DIR_DEVICE_TO_HOST (1<<7)
/* USB Standard Requests */
#define USBRQ_GET_STATUS 0
#define USBRQ_CLEAR_FEATURE 1
#define USBRQ_SET_FEATURE 3
#define USBRQ_SET_ADDRESS 5
#define USBRQ_GET_DESCRIPTOR 6
#define USBRQ_SET_DESCRIPTOR 7
#define USBRQ_GET_CONFIGURATION 8
#define USBRQ_SET_CONFIGURATION 9
#define USBRQ_GET_INTERFACE 10
#define USBRQ_SET_INTERFACE 11
#define USBRQ_SYNCH_FRAME 12
/* USB descriptor constants */
#define USBDESCR_DEVICE 1
#define USBDESCR_CONFIG 2
#define USBDESCR_STRING 3
#define USBDESCR_INTERFACE 4
#define USBDESCR_ENDPOINT 5
#define USBDESCR_HID 0x21
#define USBDESCR_HID_REPORT 0x22
#define USBDESCR_HID_PHYS 0x23
//#define USBATTR_BUSPOWER 0x80 // USB 1.1 does not define this value any more
#define USBATTR_BUSPOWER 0
#define USBATTR_SELFPOWER 0x40
#define USBATTR_REMOTEWAKE 0x20
/* USB HID Requests */
#define USBRQ_HID_GET_REPORT 0x01
#define USBRQ_HID_GET_IDLE 0x02
#define USBRQ_HID_GET_PROTOCOL 0x03
#define USBRQ_HID_SET_REPORT 0x09
#define USBRQ_HID_SET_IDLE 0x0a
#define USBRQ_HID_SET_PROTOCOL 0x0b
/* ------------------------------------------------------------------------- */
#endif /* __usbdrv_h_included__ */

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/* Name: usbdrvasm.S
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Christian Starkjohann
* Creation Date: 2007-06-13
* Tabsize: 4
* Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
/*
General Description:
This module is the assembler part of the USB driver. This file contains
general code (preprocessor acrobatics and CRC computation) and then includes
the file appropriate for the given clock rate.
*/
#define __SFR_OFFSET 0 /* used by avr-libc's register definitions */
#include "usbportability.h"
#include "usbdrv.h" /* for common defs */
/* register names */
#define x1 r16
#define x2 r17
#define shift r18
#define cnt r19
#define x3 r20
#define x4 r21
#define x5 r22
#define bitcnt x5
#define phase x4
#define leap x4
/* Some assembler dependent definitions and declarations: */
#ifdef __IAR_SYSTEMS_ASM__
extern usbRxBuf, usbDeviceAddr, usbNewDeviceAddr, usbInputBufOffset
extern usbCurrentTok, usbRxLen, usbRxToken, usbTxLen
extern usbTxBuf, usbTxStatus1, usbTxStatus3
# if USB_COUNT_SOF
extern usbSofCount
# endif
public usbCrc16
public usbCrc16Append
COMMON INTVEC
# ifndef USB_INTR_VECTOR
ORG INT0_vect
# else /* USB_INTR_VECTOR */
ORG USB_INTR_VECTOR
# undef USB_INTR_VECTOR
# endif /* USB_INTR_VECTOR */
# define USB_INTR_VECTOR usbInterruptHandler
rjmp USB_INTR_VECTOR
RSEG CODE
#else /* __IAR_SYSTEMS_ASM__ */
# ifndef USB_INTR_VECTOR /* default to hardware interrupt INT0 */
# ifdef INT0_vect
# define USB_INTR_VECTOR INT0_vect // this is the "new" define for the vector
# else
# define USB_INTR_VECTOR SIG_INTERRUPT0 // this is the "old" vector
# endif
# endif
.text
.global USB_INTR_VECTOR
.type USB_INTR_VECTOR, @function
.global usbCrc16
.global usbCrc16Append
#endif /* __IAR_SYSTEMS_ASM__ */
#if USB_INTR_PENDING < 0x40 /* This is an I/O address, use in and out */
# define USB_LOAD_PENDING(reg) in reg, USB_INTR_PENDING
# define USB_STORE_PENDING(reg) out USB_INTR_PENDING, reg
#else /* It's a memory address, use lds and sts */
# define USB_LOAD_PENDING(reg) lds reg, USB_INTR_PENDING
# define USB_STORE_PENDING(reg) sts USB_INTR_PENDING, reg
#endif
#define usbTxLen1 usbTxStatus1
#define usbTxBuf1 (usbTxStatus1 + 1)
#define usbTxLen3 usbTxStatus3
#define usbTxBuf3 (usbTxStatus3 + 1)
;----------------------------------------------------------------------------
; Utility functions
;----------------------------------------------------------------------------
#ifdef __IAR_SYSTEMS_ASM__
/* Register assignments for usbCrc16 on IAR cc */
/* Calling conventions on IAR:
* First parameter passed in r16/r17, second in r18/r19 and so on.
* Callee must preserve r4-r15, r24-r29 (r28/r29 is frame pointer)
* Result is passed in r16/r17
* In case of the "tiny" memory model, pointers are only 8 bit with no
* padding. We therefore pass argument 1 as "16 bit unsigned".
*/
RTMODEL "__rt_version", "3"
/* The line above will generate an error if cc calling conventions change.
* The value "3" above is valid for IAR 4.10B/W32
*/
# define argLen r18 /* argument 2 */
# define argPtrL r16 /* argument 1 */
# define argPtrH r17 /* argument 1 */
# define resCrcL r16 /* result */
# define resCrcH r17 /* result */
# define ptrL ZL
# define ptrH ZH
# define ptr Z
# define byte r22
# define bitCnt r19
# define polyL r20
# define polyH r21
# define scratch r23
#else /* __IAR_SYSTEMS_ASM__ */
/* Register assignments for usbCrc16 on gcc */
/* Calling conventions on gcc:
* First parameter passed in r24/r25, second in r22/23 and so on.
* Callee must preserve r1-r17, r28/r29
* Result is passed in r24/r25
*/
# define argLen r22 /* argument 2 */
# define argPtrL r24 /* argument 1 */
# define argPtrH r25 /* argument 1 */
# define resCrcL r24 /* result */
# define resCrcH r25 /* result */
# define ptrL XL
# define ptrH XH
# define ptr x
# define byte r18
# define bitCnt r19
# define polyL r20
# define polyH r21
# define scratch r23
#endif
#if USB_USE_FAST_CRC
; This implementation is faster, but has bigger code size
; Thanks to Slawomir Fras (BoskiDialer) for this code!
; It implements the following C pseudo-code:
; unsigned table(unsigned char x)
; {
; unsigned value;
;
; value = (unsigned)x << 6;
; value ^= (unsigned)x << 7;
; if(parity(x))
; value ^= 0xc001;
; return value;
; }
; unsigned usbCrc16(unsigned char *argPtr, unsigned char argLen)
; {
; unsigned crc = 0xffff;
;
; while(argLen--)
; crc = table(lo8(crc) ^ *argPtr++) ^ hi8(crc);
; return ~crc;
; }
; extern unsigned usbCrc16(unsigned char *argPtr, unsigned char argLen);
; argPtr r24+25 / r16+r17
; argLen r22 / r18
; temp variables:
; byte r18 / r22
; scratch r23
; resCrc r24+r25 / r16+r17
; ptr X / Z
usbCrc16:
mov ptrL, argPtrL
mov ptrH, argPtrH
ldi resCrcL, 0xFF
ldi resCrcH, 0xFF
rjmp usbCrc16LoopTest
usbCrc16ByteLoop:
ld byte, ptr+
eor resCrcL, byte ; resCrcL is now 'x' in table()
mov byte, resCrcL ; compute parity of 'x'
swap byte
eor byte, resCrcL
mov scratch, byte
lsr byte
lsr byte
eor byte, scratch
inc byte
lsr byte
andi byte, 1 ; byte is now parity(x)
mov scratch, resCrcL
mov resCrcL, resCrcH
eor resCrcL, byte ; low byte of if(parity(x)) value ^= 0xc001;
neg byte
andi byte, 0xc0
mov resCrcH, byte ; high byte of if(parity(x)) value ^= 0xc001;
clr byte
lsr scratch
ror byte
eor resCrcH, scratch
eor resCrcL, byte
lsr scratch
ror byte
eor resCrcH, scratch
eor resCrcL, byte
usbCrc16LoopTest:
subi argLen, 1
brsh usbCrc16ByteLoop
com resCrcL
com resCrcH
ret
#else /* USB_USE_FAST_CRC */
; This implementation is slower, but has less code size
;
; extern unsigned usbCrc16(unsigned char *argPtr, unsigned char argLen);
; argPtr r24+25 / r16+r17
; argLen r22 / r18
; temp variables:
; byte r18 / r22
; bitCnt r19
; poly r20+r21
; scratch r23
; resCrc r24+r25 / r16+r17
; ptr X / Z
usbCrc16:
mov ptrL, argPtrL
mov ptrH, argPtrH
ldi resCrcL, 0
ldi resCrcH, 0
ldi polyL, lo8(0xa001)
ldi polyH, hi8(0xa001)
com argLen ; argLen = -argLen - 1: modified loop to ensure that carry is set
ldi bitCnt, 0 ; loop counter with starnd condition = end condition
rjmp usbCrcLoopEntry
usbCrcByteLoop:
ld byte, ptr+
eor resCrcL, byte
usbCrcBitLoop:
ror resCrcH ; carry is always set here (see brcs jumps to here)
ror resCrcL
brcs usbCrcNoXor
eor resCrcL, polyL
eor resCrcH, polyH
usbCrcNoXor:
subi bitCnt, 224 ; (8 * 224) % 256 = 0; this loop iterates 8 times
brcs usbCrcBitLoop
usbCrcLoopEntry:
subi argLen, -1
brcs usbCrcByteLoop
usbCrcReady:
ret
; Thanks to Reimar Doeffinger for optimizing this CRC routine!
#endif /* USB_USE_FAST_CRC */
; extern unsigned usbCrc16Append(unsigned char *data, unsigned char len);
usbCrc16Append:
rcall usbCrc16
st ptr+, resCrcL
st ptr+, resCrcH
ret
#undef argLen
#undef argPtrL
#undef argPtrH
#undef resCrcL
#undef resCrcH
#undef ptrL
#undef ptrH
#undef ptr
#undef byte
#undef bitCnt
#undef polyL
#undef polyH
#undef scratch
#if USB_CFG_HAVE_MEASURE_FRAME_LENGTH
#ifdef __IAR_SYSTEMS_ASM__
/* Register assignments for usbMeasureFrameLength on IAR cc */
/* Calling conventions on IAR:
* First parameter passed in r16/r17, second in r18/r19 and so on.
* Callee must preserve r4-r15, r24-r29 (r28/r29 is frame pointer)
* Result is passed in r16/r17
* In case of the "tiny" memory model, pointers are only 8 bit with no
* padding. We therefore pass argument 1 as "16 bit unsigned".
*/
# define resL r16
# define resH r17
# define cnt16L r30
# define cnt16H r31
# define cntH r18
#else /* __IAR_SYSTEMS_ASM__ */
/* Register assignments for usbMeasureFrameLength on gcc */
/* Calling conventions on gcc:
* First parameter passed in r24/r25, second in r22/23 and so on.
* Callee must preserve r1-r17, r28/r29
* Result is passed in r24/r25
*/
# define resL r24
# define resH r25
# define cnt16L r24
# define cnt16H r25
# define cntH r26
#endif
# define cnt16 cnt16L
; extern unsigned usbMeasurePacketLength(void);
; returns time between two idle strobes in multiples of 7 CPU clocks
.global usbMeasureFrameLength
usbMeasureFrameLength:
ldi cntH, 6 ; wait ~ 10 ms for D- == 0
clr cnt16L
clr cnt16H
usbMFTime16:
dec cntH
breq usbMFTimeout
usbMFWaitStrobe: ; first wait for D- == 0 (idle strobe)
sbiw cnt16, 1 ;[0] [6]
breq usbMFTime16 ;[2]
sbic USBIN, USBMINUS ;[3]
rjmp usbMFWaitStrobe ;[4]
usbMFWaitIdle: ; then wait until idle again
sbis USBIN, USBMINUS ;1 wait for D- == 1
rjmp usbMFWaitIdle ;2
ldi cnt16L, 1 ;1 represents cycles so far
clr cnt16H ;1
usbMFWaitLoop:
in cntH, USBIN ;[0] [7]
adiw cnt16, 1 ;[1]
breq usbMFTimeout ;[3]
andi cntH, USBMASK ;[4]
brne usbMFWaitLoop ;[5]
usbMFTimeout:
#if resL != cnt16L
mov resL, cnt16L
mov resH, cnt16H
#endif
ret
#undef resL
#undef resH
#undef cnt16
#undef cnt16L
#undef cnt16H
#undef cntH
#endif /* USB_CFG_HAVE_MEASURE_FRAME_LENGTH */
;----------------------------------------------------------------------------
; Now include the clock rate specific code
;----------------------------------------------------------------------------
#ifndef USB_CFG_CLOCK_KHZ
# ifdef F_CPU
# define USB_CFG_CLOCK_KHZ (F_CPU/1000)
# else
# error "USB_CFG_CLOCK_KHZ not defined in usbconfig.h and no F_CPU set!"
# endif
#endif
#if USB_CFG_CHECK_CRC /* separate dispatcher for CRC type modules */
# if USB_CFG_CLOCK_KHZ == 18000
# include "usbdrvasm18-crc.inc"
# else
# error "USB_CFG_CLOCK_KHZ is not one of the supported crc-rates!"
# endif
#else /* USB_CFG_CHECK_CRC */
# if USB_CFG_CLOCK_KHZ == 12000
# include "usbdrvasm12.inc"
# elif USB_CFG_CLOCK_KHZ == 12800
# include "usbdrvasm128.inc"
# elif USB_CFG_CLOCK_KHZ == 15000
# include "usbdrvasm15.inc"
# elif USB_CFG_CLOCK_KHZ == 16000
# include "usbdrvasm16.inc"
# elif USB_CFG_CLOCK_KHZ == 16500
# include "usbdrvasm165.inc"
# elif USB_CFG_CLOCK_KHZ == 20000
# include "usbdrvasm20.inc"
# else
# error "USB_CFG_CLOCK_KHZ is not one of the supported non-crc-rates!"
# endif
#endif /* USB_CFG_CHECK_CRC */

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/* Name: usbdrvasm.asm
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Christian Starkjohann
* Creation Date: 2006-03-01
* Tabsize: 4
* Copyright: (c) 2006 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
/*
General Description:
The IAR compiler/assembler system prefers assembler files with file extension
".asm". We simply provide this file as an alias for usbdrvasm.S.
Thanks to Oleg Semyonov for his help with the IAR tools port!
*/
#include "usbdrvasm.S"
end

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/* Name: usbdrvasm12.inc
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Christian Starkjohann
* Creation Date: 2004-12-29
* Tabsize: 4
* Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
/* Do not link this file! Link usbdrvasm.S instead, which includes the
* appropriate implementation!
*/
/*
General Description:
This file is the 12 MHz version of the asssembler part of the USB driver. It
requires a 12 MHz crystal (not a ceramic resonator and not a calibrated RC
oscillator).
See usbdrv.h for a description of the entire driver.
Since almost all of this code is timing critical, don't change unless you
really know what you are doing! Many parts require not only a maximum number
of CPU cycles, but even an exact number of cycles!
Timing constraints according to spec (in bit times):
timing subject min max CPUcycles
---------------------------------------------------------------------------
EOP of OUT/SETUP to sync pattern of DATA0 (both rx) 2 16 16-128
EOP of IN to sync pattern of DATA0 (rx, then tx) 2 7.5 16-60
DATAx (rx) to ACK/NAK/STALL (tx) 2 7.5 16-60
*/
;Software-receiver engine. Strict timing! Don't change unless you can preserve timing!
;interrupt response time: 4 cycles + insn running = 7 max if interrupts always enabled
;max allowable interrupt latency: 34 cycles -> max 25 cycles interrupt disable
;max stack usage: [ret(2), YL, SREG, YH, shift, x1, x2, x3, cnt, x4] = 11 bytes
;Numbers in brackets are maximum cycles since SOF.
USB_INTR_VECTOR:
;order of registers pushed: YL, SREG [sofError], YH, shift, x1, x2, x3, cnt
push YL ;2 [35] push only what is necessary to sync with edge ASAP
in YL, SREG ;1 [37]
push YL ;2 [39]
;----------------------------------------------------------------------------
; Synchronize with sync pattern:
;----------------------------------------------------------------------------
;sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K]
;sync up with J to K edge during sync pattern -- use fastest possible loops
;The first part waits at most 1 bit long since we must be in sync pattern.
;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to
;waitForJ, ensure that this prerequisite is met.
waitForJ:
inc YL
sbis USBIN, USBMINUS
brne waitForJ ; just make sure we have ANY timeout
waitForK:
;The following code results in a sampling window of 1/4 bit which meets the spec.
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
#if USB_COUNT_SOF
lds YL, usbSofCount
inc YL
sts usbSofCount, YL
#endif /* USB_COUNT_SOF */
#ifdef USB_SOF_HOOK
USB_SOF_HOOK
#endif
rjmp sofError
foundK:
;{3, 5} after falling D- edge, average delay: 4 cycles [we want 4 for center sampling]
;we have 1 bit time for setup purposes, then sample again. Numbers in brackets
;are cycles from center of first sync (double K) bit after the instruction
push YH ;2 [2]
lds YL, usbInputBufOffset;2 [4]
clr YH ;1 [5]
subi YL, lo8(-(usbRxBuf));1 [6]
sbci YH, hi8(-(usbRxBuf));1 [7]
sbis USBIN, USBMINUS ;1 [8] we want two bits K [sample 1 cycle too early]
rjmp haveTwoBitsK ;2 [10]
pop YH ;2 [11] undo the push from before
rjmp waitForK ;2 [13] this was not the end of sync, retry
haveTwoBitsK:
;----------------------------------------------------------------------------
; push more registers and initialize values while we sample the first bits:
;----------------------------------------------------------------------------
push shift ;2 [16]
push x1 ;2 [12]
push x2 ;2 [14]
in x1, USBIN ;1 [17] <-- sample bit 0
ldi shift, 0xff ;1 [18]
bst x1, USBMINUS ;1 [19]
bld shift, 0 ;1 [20]
push x3 ;2 [22]
push cnt ;2 [24]
in x2, USBIN ;1 [25] <-- sample bit 1
ser x3 ;1 [26] [inserted init instruction]
eor x1, x2 ;1 [27]
bst x1, USBMINUS ;1 [28]
bld shift, 1 ;1 [29]
ldi cnt, USB_BUFSIZE;1 [30] [inserted init instruction]
rjmp rxbit2 ;2 [32]
;----------------------------------------------------------------------------
; Receiver loop (numbers in brackets are cycles within byte after instr)
;----------------------------------------------------------------------------
unstuff0: ;1 (branch taken)
andi x3, ~0x01 ;1 [15]
mov x1, x2 ;1 [16] x2 contains last sampled (stuffed) bit
in x2, USBIN ;1 [17] <-- sample bit 1 again
ori shift, 0x01 ;1 [18]
rjmp didUnstuff0 ;2 [20]
unstuff1: ;1 (branch taken)
mov x2, x1 ;1 [21] x1 contains last sampled (stuffed) bit
andi x3, ~0x02 ;1 [22]
ori shift, 0x02 ;1 [23]
nop ;1 [24]
in x1, USBIN ;1 [25] <-- sample bit 2 again
rjmp didUnstuff1 ;2 [27]
unstuff2: ;1 (branch taken)
andi x3, ~0x04 ;1 [29]
ori shift, 0x04 ;1 [30]
mov x1, x2 ;1 [31] x2 contains last sampled (stuffed) bit
nop ;1 [32]
in x2, USBIN ;1 [33] <-- sample bit 3
rjmp didUnstuff2 ;2 [35]
unstuff3: ;1 (branch taken)
in x2, USBIN ;1 [34] <-- sample stuffed bit 3 [one cycle too late]
andi x3, ~0x08 ;1 [35]
ori shift, 0x08 ;1 [36]
rjmp didUnstuff3 ;2 [38]
unstuff4: ;1 (branch taken)
andi x3, ~0x10 ;1 [40]
in x1, USBIN ;1 [41] <-- sample stuffed bit 4
ori shift, 0x10 ;1 [42]
rjmp didUnstuff4 ;2 [44]
unstuff5: ;1 (branch taken)
andi x3, ~0x20 ;1 [48]
in x2, USBIN ;1 [49] <-- sample stuffed bit 5
ori shift, 0x20 ;1 [50]
rjmp didUnstuff5 ;2 [52]
unstuff6: ;1 (branch taken)
andi x3, ~0x40 ;1 [56]
in x1, USBIN ;1 [57] <-- sample stuffed bit 6
ori shift, 0x40 ;1 [58]
rjmp didUnstuff6 ;2 [60]
; extra jobs done during bit interval:
; bit 0: store, clear [SE0 is unreliable here due to bit dribbling in hubs]
; bit 1: se0 check
; bit 2: overflow check
; bit 3: recovery from delay [bit 0 tasks took too long]
; bit 4: none
; bit 5: none
; bit 6: none
; bit 7: jump, eor
rxLoop:
eor x3, shift ;1 [0] reconstruct: x3 is 0 at bit locations we changed, 1 at others
in x1, USBIN ;1 [1] <-- sample bit 0
st y+, x3 ;2 [3] store data
ser x3 ;1 [4]
nop ;1 [5]
eor x2, x1 ;1 [6]
bst x2, USBMINUS;1 [7]
bld shift, 0 ;1 [8]
in x2, USBIN ;1 [9] <-- sample bit 1 (or possibly bit 0 stuffed)
andi x2, USBMASK ;1 [10]
breq se0 ;1 [11] SE0 check for bit 1
andi shift, 0xf9 ;1 [12]
didUnstuff0:
breq unstuff0 ;1 [13]
eor x1, x2 ;1 [14]
bst x1, USBMINUS;1 [15]
bld shift, 1 ;1 [16]
rxbit2:
in x1, USBIN ;1 [17] <-- sample bit 2 (or possibly bit 1 stuffed)
andi shift, 0xf3 ;1 [18]
breq unstuff1 ;1 [19] do remaining work for bit 1
didUnstuff1:
subi cnt, 1 ;1 [20]
brcs overflow ;1 [21] loop control
eor x2, x1 ;1 [22]
bst x2, USBMINUS;1 [23]
bld shift, 2 ;1 [24]
in x2, USBIN ;1 [25] <-- sample bit 3 (or possibly bit 2 stuffed)
andi shift, 0xe7 ;1 [26]
breq unstuff2 ;1 [27]
didUnstuff2:
eor x1, x2 ;1 [28]
bst x1, USBMINUS;1 [29]
bld shift, 3 ;1 [30]
didUnstuff3:
andi shift, 0xcf ;1 [31]
breq unstuff3 ;1 [32]
in x1, USBIN ;1 [33] <-- sample bit 4
eor x2, x1 ;1 [34]
bst x2, USBMINUS;1 [35]
bld shift, 4 ;1 [36]
didUnstuff4:
andi shift, 0x9f ;1 [37]
breq unstuff4 ;1 [38]
nop2 ;2 [40]
in x2, USBIN ;1 [41] <-- sample bit 5
eor x1, x2 ;1 [42]
bst x1, USBMINUS;1 [43]
bld shift, 5 ;1 [44]
didUnstuff5:
andi shift, 0x3f ;1 [45]
breq unstuff5 ;1 [46]
nop2 ;2 [48]
in x1, USBIN ;1 [49] <-- sample bit 6
eor x2, x1 ;1 [50]
bst x2, USBMINUS;1 [51]
bld shift, 6 ;1 [52]
didUnstuff6:
cpi shift, 0x02 ;1 [53]
brlo unstuff6 ;1 [54]
nop2 ;2 [56]
in x2, USBIN ;1 [57] <-- sample bit 7
eor x1, x2 ;1 [58]
bst x1, USBMINUS;1 [59]
bld shift, 7 ;1 [60]
didUnstuff7:
cpi shift, 0x04 ;1 [61]
brsh rxLoop ;2 [63] loop control
unstuff7:
andi x3, ~0x80 ;1 [63]
ori shift, 0x80 ;1 [64]
in x2, USBIN ;1 [65] <-- sample stuffed bit 7
nop ;1 [66]
rjmp didUnstuff7 ;2 [68]
macro POP_STANDARD ; 12 cycles
pop cnt
pop x3
pop x2
pop x1
pop shift
pop YH
endm
macro POP_RETI ; 5 cycles
pop YL
out SREG, YL
pop YL
endm
#include "asmcommon.inc"
;----------------------------------------------------------------------------
; Transmitting data
;----------------------------------------------------------------------------
txByteLoop:
txBitloop:
stuffN1Delay: ; [03]
ror shift ;[-5] [11] [59]
brcc doExorN1 ;[-4] [60]
subi x4, 1 ;[-3]
brne commonN1 ;[-2]
lsl shift ;[-1] compensate ror after rjmp stuffDelay
nop ;[00] stuffing consists of just waiting 8 cycles
rjmp stuffN1Delay ;[01] after ror, C bit is reliably clear
sendNakAndReti: ;0 [-19] 19 cycles until SOP
ldi x3, USBPID_NAK ;1 [-18]
rjmp usbSendX3 ;2 [-16]
sendAckAndReti: ;0 [-19] 19 cycles until SOP
ldi x3, USBPID_ACK ;1 [-18]
rjmp usbSendX3 ;2 [-16]
sendCntAndReti: ;0 [-17] 17 cycles until SOP
mov x3, cnt ;1 [-16]
usbSendX3: ;0 [-16]
ldi YL, 20 ;1 [-15] 'x3' is R20
ldi YH, 0 ;1 [-14]
ldi cnt, 2 ;1 [-13]
; rjmp usbSendAndReti fallthrough
; USB spec says:
; idle = J
; J = (D+ = 0), (D- = 1) or USBOUT = 0x01
; K = (D+ = 1), (D- = 0) or USBOUT = 0x02
; Spec allows 7.5 bit times from EOP to SOP for replies (= 60 cycles)
;usbSend:
;pointer to data in 'Y'
;number of bytes in 'cnt' -- including sync byte
;uses: x1...x2, x4, shift, cnt, Y [x1 = mirror USBOUT, x2 = USBMASK, x4 = bitstuff cnt]
;Numbers in brackets are time since first bit of sync pattern is sent (start of instruction)
usbSendAndReti:
in x2, USBDDR ;[-12] 12 cycles until SOP
ori x2, USBMASK ;[-11]
sbi USBOUT, USBMINUS ;[-10] prepare idle state; D+ and D- must have been 0 (no pullups)
out USBDDR, x2 ;[-8] <--- acquire bus
in x1, USBOUT ;[-7] port mirror for tx loop
ldi shift, 0x40 ;[-6] sync byte is first byte sent (we enter loop after ror)
ldi x2, USBMASK ;[-5]
push x4 ;[-4]
doExorN1:
eor x1, x2 ;[-2] [06] [62]
ldi x4, 6 ;[-1] [07] [63]
commonN1:
stuffN2Delay:
out USBOUT, x1 ;[00] [08] [64] <--- set bit
ror shift ;[01]
brcc doExorN2 ;[02]
subi x4, 1 ;[03]
brne commonN2 ;[04]
lsl shift ;[05] compensate ror after rjmp stuffDelay
rjmp stuffN2Delay ;[06] after ror, C bit is reliably clear
doExorN2:
eor x1, x2 ;[04] [12]
ldi x4, 6 ;[05] [13]
commonN2:
nop ;[06] [14]
subi cnt, 171 ;[07] [15] trick: (3 * 171) & 0xff = 1
out USBOUT, x1 ;[08] [16] <--- set bit
brcs txBitloop ;[09] [25] [41]
stuff6Delay:
ror shift ;[42] [50]
brcc doExor6 ;[43]
subi x4, 1 ;[44]
brne common6 ;[45]
lsl shift ;[46] compensate ror after rjmp stuffDelay
nop ;[47] stuffing consists of just waiting 8 cycles
rjmp stuff6Delay ;[48] after ror, C bit is reliably clear
doExor6:
eor x1, x2 ;[45] [53]
ldi x4, 6 ;[46]
common6:
stuff7Delay:
ror shift ;[47] [55]
out USBOUT, x1 ;[48] <--- set bit
brcc doExor7 ;[49]
subi x4, 1 ;[50]
brne common7 ;[51]
lsl shift ;[52] compensate ror after rjmp stuffDelay
rjmp stuff7Delay ;[53] after ror, C bit is reliably clear
doExor7:
eor x1, x2 ;[51] [59]
ldi x4, 6 ;[52]
common7:
ld shift, y+ ;[53]
tst cnt ;[55]
out USBOUT, x1 ;[56] <--- set bit
brne txByteLoop ;[57]
;make SE0:
cbr x1, USBMASK ;[58] prepare SE0 [spec says EOP may be 15 to 18 cycles]
lds x2, usbNewDeviceAddr;[59]
lsl x2 ;[61] we compare with left shifted address
subi YL, 2 + 20 ;[62] Only assign address on data packets, not ACK/NAK in x3
sbci YH, 0 ;[63]
out USBOUT, x1 ;[00] <-- out SE0 -- from now 2 bits = 16 cycles until bus idle
;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm:
;set address only after data packet was sent, not after handshake
breq skipAddrAssign ;[01]
sts usbDeviceAddr, x2 ; if not skipped: SE0 is one cycle longer
skipAddrAssign:
;end of usbDeviceAddress transfer
ldi x2, 1<<USB_INTR_PENDING_BIT;[03] int0 occurred during TX -- clear pending flag
USB_STORE_PENDING(x2) ;[04]
ori x1, USBIDLE ;[05]
in x2, USBDDR ;[06]
cbr x2, USBMASK ;[07] set both pins to input
mov x3, x1 ;[08]
cbr x3, USBMASK ;[09] configure no pullup on both pins
pop x4 ;[10]
nop2 ;[12]
nop2 ;[14]
out USBOUT, x1 ;[16] <-- out J (idle) -- end of SE0 (EOP signal)
out USBDDR, x2 ;[17] <-- release bus now
out USBOUT, x3 ;[18] <-- ensure no pull-up resistors are active
rjmp doReturn

749
bootloader/usbdrv/usbdrvasm128.inc Normal file
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@ -0,0 +1,749 @@
/* Name: usbdrvasm128.inc
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Christian Starkjohann
* Creation Date: 2008-10-11
* Tabsize: 4
* Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
/* Do not link this file! Link usbdrvasm.S instead, which includes the
* appropriate implementation!
*/
/*
General Description:
This file is the 12.8 MHz version of the USB driver. It is intended for use
with the internal RC oscillator. Although 12.8 MHz is outside the guaranteed
calibration range of the oscillator, almost all AVRs can reach this frequency.
This version contains a phase locked loop in the receiver routine to cope with
slight clock rate deviations of up to +/- 1%.
See usbdrv.h for a description of the entire driver.
LIMITATIONS
===========
Although it may seem very handy to save the crystal and use the internal
RC oscillator of the CPU, this method (and this module) has some serious
limitations:
(1) The guaranteed calibration range of the oscillator is only 8.1 MHz.
They typical range is 14.5 MHz and most AVRs can actually reach this rate.
(2) Writing EEPROM and Flash may be unreliable (short data lifetime) since
the write procedure is timed from the RC oscillator.
(3) End Of Packet detection (SE0) should be in bit 1, bit it is only checked
if bits 0 and 1 both read as 0 on D- and D+ read as 0 in the middle. This may
cause problems with old hubs which delay SE0 by up to one cycle.
(4) Code size is much larger than that of the other modules.
Since almost all of this code is timing critical, don't change unless you
really know what you are doing! Many parts require not only a maximum number
of CPU cycles, but even an exact number of cycles!
Implementation notes:
======================
min frequency: 67 cycles for 8 bit -> 12.5625 MHz
max frequency: 69.286 cycles for 8 bit -> 12.99 MHz
nominal frequency: 12.77 MHz ( = sqrt(min * max))
sampling positions: (next even number in range [+/- 0.5])
cycle index range: 0 ... 66
bits:
.5, 8.875, 17.25, 25.625, 34, 42.375, 50.75, 59.125
[0/1], [9], [17], [25/+26], [34], [+42/43], [51], [59]
bit number: 0 1 2 3 4 5 6 7
spare cycles 1 2 1 2 1 1 1 0
operations to perform: duration cycle
----------------
eor fix, shift 1 -> 00
andi phase, USBMASK 1 -> 08
breq se0 1 -> 16 (moved to 11)
st y+, data 2 -> 24, 25
mov data, fix 1 -> 33
ser data 1 -> 41
subi cnt, 1 1 -> 49
brcs overflow 1 -> 50
layout of samples and operations:
[##] = sample bit
<##> = sample phase
*##* = operation
0: *00* [01] 02 03 04 <05> 06 07
1: *08* [09] 10 11 12 <13> 14 15 *16*
2: [17] 18 19 20 <21> 22 23
3: *24* *25* [26] 27 28 29 <30> 31 32
4: *33* [34] 35 36 37 <38> 39 40
5: *41* [42] 43 44 45 <46> 47 48
6: *49* *50* [51] 52 53 54 <55> 56 57 58
7: [59] 60 61 62 <63> 64 65 66
*****************************************************************************/
/* we prefer positive expressions (do if condition) instead of negative
* (skip if condition), therefore use defines for skip instructions:
*/
#define ifioclr sbis
#define ifioset sbic
#define ifrclr sbrs
#define ifrset sbrc
/* The registers "fix" and "data" swap their meaning during the loop. Use
* defines to keep their name constant.
*/
#define fix x2
#define data x1
#undef phase /* phase has a default definition to x4 */
#define phase x3
USB_INTR_VECTOR:
;order of registers pushed: YL, SREG [sofError], YH, shift, x1, x2, x3, cnt, r0
push YL ;2 push only what is necessary to sync with edge ASAP
in YL, SREG ;1
push YL ;2
;----------------------------------------------------------------------------
; Synchronize with sync pattern:
;----------------------------------------------------------------------------
;sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K]
;sync up with J to K edge during sync pattern -- use fastest possible loops
;The first part waits at most 1 bit long since we must be in sync pattern.
;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to
;waitForJ, ensure that this prerequisite is met.
waitForJ:
inc YL
sbis USBIN, USBMINUS
brne waitForJ ; just make sure we have ANY timeout
waitForK:
;The following code results in a sampling window of 1/4 bit which meets the spec.
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS ;[0]
rjmp foundK ;[1]
#if USB_COUNT_SOF
lds YL, usbSofCount
inc YL
sts usbSofCount, YL
#endif /* USB_COUNT_SOF */
#ifdef USB_SOF_HOOK
USB_SOF_HOOK
#endif
rjmp sofError
foundK:
;{3, 5} after falling D- edge, average delay: 4 cycles [we want 4 for center sampling]
;we have 1 bit time for setup purposes, then sample again. Numbers in brackets
;are cycles from center of first sync (double K) bit after the instruction
push YH ;[2]
lds YL, usbInputBufOffset;[4]
clr YH ;[6]
subi YL, lo8(-(usbRxBuf));[7]
sbci YH, hi8(-(usbRxBuf));[8]
sbis USBIN, USBMINUS ;[9] we want two bits K [we want to sample at 8 + 4 - 1.5 = 10.5]
rjmp haveTwoBitsK ;[10]
pop YH ;[11] undo the push from before
rjmp waitForK ;[13] this was not the end of sync, retry
haveTwoBitsK:
;----------------------------------------------------------------------------
; push more registers and initialize values while we sample the first bits:
;----------------------------------------------------------------------------
#define fix x2
#define data x1
push shift ;[12]
push x1 ;[14]
push x2 ;[16]
ldi shift, 0x80 ;[18] prevent bit-unstuffing but init low bits to 0
ifioset USBIN, USBMINUS ;[19] [01] <--- bit 0 [10.5 + 8 = 18.5]
ori shift, 1<<0 ;[02]
push x3 ;[03]
push cnt ;[05]
push r0 ;[07]
ifioset USBIN, USBMINUS ;[09] <--- bit 1
ori shift, 1<<1 ;[10]
ser fix ;[11]
ldi cnt, USB_BUFSIZE ;[12]
mov data, shift ;[13]
lsl shift ;[14]
nop2 ;[15]
ifioset USBIN, USBMINUS ;[17] <--- bit 2
ori data, 3<<2 ;[18] store in bit 2 AND bit 3
eor shift, data ;[19] do nrzi decoding
andi data, 1<<3 ;[20]
in phase, USBIN ;[21] <- phase
brne jumpToEntryAfterSet ;[22] if USBMINS at bit 3 was 1
nop ;[23]
rjmp entryAfterClr ;[24]
jumpToEntryAfterSet:
rjmp entryAfterSet ;[24]
;----------------------------------------------------------------------------
; Receiver loop (numbers in brackets are cycles within byte after instr)
;----------------------------------------------------------------------------
#undef fix
#define fix x1
#undef data
#define data x2
bit7IsSet:
ifrclr phase, USBMINUS ;[62] check phase only if D- changed
lpm ;[63]
in phase, USBIN ;[64] <- phase (one cycle too late)
ori shift, 1 << 7 ;[65]
nop ;[66]
;;;;rjmp bit0AfterSet ; -> [00] == [67] moved block up to save jump
bit0AfterSet:
eor fix, shift ;[00]
#undef fix
#define fix x2
#undef data
#define data x1 /* we now have result in data, fix is reset to 0xff */
ifioclr USBIN, USBMINUS ;[01] <--- sample 0
rjmp bit0IsClr ;[02]
andi shift, ~(7 << 0) ;[03]
breq unstuff0s ;[04]
in phase, USBIN ;[05] <- phase
rjmp bit1AfterSet ;[06]
unstuff0s:
in phase, USBIN ;[06] <- phase (one cycle too late)
andi fix, ~(1 << 0) ;[07]
ifioclr USBIN, USBMINUS ;[00]
ifioset USBIN, USBPLUS ;[01]
rjmp bit0IsClr ;[02] executed if first expr false or second true
se0AndStore: ; executed only if both bits 0
st y+, x1 ;[15/17] cycles after start of byte
rjmp se0 ;[17/19]
bit0IsClr:
ifrset phase, USBMINUS ;[04] check phase only if D- changed
lpm ;[05]
in phase, USBIN ;[06] <- phase (one cycle too late)
ori shift, 1 << 0 ;[07]
bit1AfterClr:
andi phase, USBMASK ;[08]
ifioset USBIN, USBMINUS ;[09] <--- sample 1
rjmp bit1IsSet ;[10]
breq se0AndStore ;[11] if D- was 0 in bits 0 AND 1 and D+ was 0 in between, we have SE0
andi shift, ~(7 << 1) ;[12]
in phase, USBIN ;[13] <- phase
breq unstuff1c ;[14]
rjmp bit2AfterClr ;[15]
unstuff1c:
andi fix, ~(1 << 1) ;[16]
nop2 ;[08]
nop2 ;[10]
bit1IsSet:
ifrclr phase, USBMINUS ;[12] check phase only if D- changed
lpm ;[13]
in phase, USBIN ;[14] <- phase (one cycle too late)
ori shift, 1 << 1 ;[15]
nop ;[16]
bit2AfterSet:
ifioclr USBIN, USBMINUS ;[17] <--- sample 2
rjmp bit2IsClr ;[18]
andi shift, ~(7 << 2) ;[19]
breq unstuff2s ;[20]
in phase, USBIN ;[21] <- phase
rjmp bit3AfterSet ;[22]
unstuff2s:
in phase, USBIN ;[22] <- phase (one cycle too late)
andi fix, ~(1 << 2) ;[23]
nop2 ;[16]
nop2 ;[18]
bit2IsClr:
ifrset phase, USBMINUS ;[20] check phase only if D- changed
lpm ;[21]
in phase, USBIN ;[22] <- phase (one cycle too late)
ori shift, 1 << 2 ;[23]
bit3AfterClr:
st y+, data ;[24]
entryAfterClr:
ifioset USBIN, USBMINUS ;[26] <--- sample 3
rjmp bit3IsSet ;[27]
andi shift, ~(7 << 3) ;[28]
breq unstuff3c ;[29]
in phase, USBIN ;[30] <- phase
rjmp bit4AfterClr ;[31]
unstuff3c:
in phase, USBIN ;[31] <- phase (one cycle too late)
andi fix, ~(1 << 3) ;[32]
nop2 ;[25]
nop2 ;[27]
bit3IsSet:
ifrclr phase, USBMINUS ;[29] check phase only if D- changed
lpm ;[30]
in phase, USBIN ;[31] <- phase (one cycle too late)
ori shift, 1 << 3 ;[32]
bit4AfterSet:
mov data, fix ;[33] undo this move by swapping defines
#undef fix
#define fix x1
#undef data
#define data x2
ifioclr USBIN, USBMINUS ;[34] <--- sample 4
rjmp bit4IsClr ;[35]
andi shift, ~(7 << 4) ;[36]
breq unstuff4s ;[37]
in phase, USBIN ;[38] <- phase
rjmp bit5AfterSet ;[39]
unstuff4s:
in phase, USBIN ;[39] <- phase (one cycle too late)
andi fix, ~(1 << 4) ;[40]
nop2 ;[33]
nop2 ;[35]
bit4IsClr:
ifrset phase, USBMINUS ;[37] check phase only if D- changed
lpm ;[38]
in phase, USBIN ;[39] <- phase (one cycle too late)
ori shift, 1 << 4 ;[40]
bit5AfterClr:
ser data ;[41]
ifioset USBIN, USBMINUS ;[42] <--- sample 5
rjmp bit5IsSet ;[43]
andi shift, ~(7 << 5) ;[44]
breq unstuff5c ;[45]
in phase, USBIN ;[46] <- phase
rjmp bit6AfterClr ;[47]
unstuff5c:
in phase, USBIN ;[47] <- phase (one cycle too late)
andi fix, ~(1 << 5) ;[48]
nop2 ;[41]
nop2 ;[43]
bit5IsSet:
ifrclr phase, USBMINUS ;[45] check phase only if D- changed
lpm ;[46]
in phase, USBIN ;[47] <- phase (one cycle too late)
ori shift, 1 << 5 ;[48]
bit6AfterSet:
subi cnt, 1 ;[49]
brcs jumpToOverflow ;[50]
ifioclr USBIN, USBMINUS ;[51] <--- sample 6
rjmp bit6IsClr ;[52]
andi shift, ~(3 << 6) ;[53]
cpi shift, 2 ;[54]
in phase, USBIN ;[55] <- phase
brlt unstuff6s ;[56]
rjmp bit7AfterSet ;[57]
jumpToOverflow:
rjmp overflow
unstuff6s:
andi fix, ~(1 << 6) ;[50]
lpm ;[51]
bit6IsClr:
ifrset phase, USBMINUS ;[54] check phase only if D- changed
lpm ;[55]
in phase, USBIN ;[56] <- phase (one cycle too late)
ori shift, 1 << 6 ;[57]
nop ;[58]
bit7AfterClr:
ifioset USBIN, USBMINUS ;[59] <--- sample 7
rjmp bit7IsSet ;[60]
andi shift, ~(1 << 7) ;[61]
cpi shift, 4 ;[62]
in phase, USBIN ;[63] <- phase
brlt unstuff7c ;[64]
rjmp bit0AfterClr ;[65] -> [00] == [67]
unstuff7c:
andi fix, ~(1 << 7) ;[58]
nop ;[59]
rjmp bit7IsSet ;[60]
bit7IsClr:
ifrset phase, USBMINUS ;[62] check phase only if D- changed
lpm ;[63]
in phase, USBIN ;[64] <- phase (one cycle too late)
ori shift, 1 << 7 ;[65]
nop ;[66]
;;;;rjmp bit0AfterClr ; -> [00] == [67] moved block up to save jump
bit0AfterClr:
eor fix, shift ;[00]
#undef fix
#define fix x2
#undef data
#define data x1 /* we now have result in data, fix is reset to 0xff */
ifioset USBIN, USBMINUS ;[01] <--- sample 0
rjmp bit0IsSet ;[02]
andi shift, ~(7 << 0) ;[03]
breq unstuff0c ;[04]
in phase, USBIN ;[05] <- phase
rjmp bit1AfterClr ;[06]
unstuff0c:
in phase, USBIN ;[06] <- phase (one cycle too late)
andi fix, ~(1 << 0) ;[07]
ifioclr USBIN, USBMINUS ;[00]
ifioset USBIN, USBPLUS ;[01]
rjmp bit0IsSet ;[02] executed if first expr false or second true
rjmp se0AndStore ;[03] executed only if both bits 0
bit0IsSet:
ifrclr phase, USBMINUS ;[04] check phase only if D- changed
lpm ;[05]
in phase, USBIN ;[06] <- phase (one cycle too late)
ori shift, 1 << 0 ;[07]
bit1AfterSet:
andi shift, ~(7 << 1) ;[08] compensated by "ori shift, 1<<1" if bit1IsClr
ifioclr USBIN, USBMINUS ;[09] <--- sample 1
rjmp bit1IsClr ;[10]
breq unstuff1s ;[11]
nop2 ;[12] do not check for SE0 if bit 0 was 1
in phase, USBIN ;[14] <- phase (one cycle too late)
rjmp bit2AfterSet ;[15]
unstuff1s:
in phase, USBIN ;[13] <- phase
andi fix, ~(1 << 1) ;[14]
lpm ;[07]
nop2 ;[10]
bit1IsClr:
ifrset phase, USBMINUS ;[12] check phase only if D- changed
lpm ;[13]
in phase, USBIN ;[14] <- phase (one cycle too late)
ori shift, 1 << 1 ;[15]
nop ;[16]
bit2AfterClr:
ifioset USBIN, USBMINUS ;[17] <--- sample 2
rjmp bit2IsSet ;[18]
andi shift, ~(7 << 2) ;[19]
breq unstuff2c ;[20]
in phase, USBIN ;[21] <- phase
rjmp bit3AfterClr ;[22]
unstuff2c:
in phase, USBIN ;[22] <- phase (one cycle too late)
andi fix, ~(1 << 2) ;[23]
nop2 ;[16]
nop2 ;[18]
bit2IsSet:
ifrclr phase, USBMINUS ;[20] check phase only if D- changed
lpm ;[21]
in phase, USBIN ;[22] <- phase (one cycle too late)
ori shift, 1 << 2 ;[23]
bit3AfterSet:
st y+, data ;[24]
entryAfterSet:
ifioclr USBIN, USBMINUS ;[26] <--- sample 3
rjmp bit3IsClr ;[27]
andi shift, ~(7 << 3) ;[28]
breq unstuff3s ;[29]
in phase, USBIN ;[30] <- phase
rjmp bit4AfterSet ;[31]
unstuff3s:
in phase, USBIN ;[31] <- phase (one cycle too late)
andi fix, ~(1 << 3) ;[32]
nop2 ;[25]
nop2 ;[27]
bit3IsClr:
ifrset phase, USBMINUS ;[29] check phase only if D- changed
lpm ;[30]
in phase, USBIN ;[31] <- phase (one cycle too late)
ori shift, 1 << 3 ;[32]
bit4AfterClr:
mov data, fix ;[33] undo this move by swapping defines
#undef fix
#define fix x1
#undef data
#define data x2
ifioset USBIN, USBMINUS ;[34] <--- sample 4
rjmp bit4IsSet ;[35]
andi shift, ~(7 << 4) ;[36]
breq unstuff4c ;[37]
in phase, USBIN ;[38] <- phase
rjmp bit5AfterClr ;[39]
unstuff4c:
in phase, USBIN ;[39] <- phase (one cycle too late)
andi fix, ~(1 << 4) ;[40]
nop2 ;[33]
nop2 ;[35]
bit4IsSet:
ifrclr phase, USBMINUS ;[37] check phase only if D- changed
lpm ;[38]
in phase, USBIN ;[39] <- phase (one cycle too late)
ori shift, 1 << 4 ;[40]
bit5AfterSet:
ser data ;[41]
ifioclr USBIN, USBMINUS ;[42] <--- sample 5
rjmp bit5IsClr ;[43]
andi shift, ~(7 << 5) ;[44]
breq unstuff5s ;[45]
in phase, USBIN ;[46] <- phase
rjmp bit6AfterSet ;[47]
unstuff5s:
in phase, USBIN ;[47] <- phase (one cycle too late)
andi fix, ~(1 << 5) ;[48]
nop2 ;[41]
nop2 ;[43]
bit5IsClr:
ifrset phase, USBMINUS ;[45] check phase only if D- changed
lpm ;[46]
in phase, USBIN ;[47] <- phase (one cycle too late)
ori shift, 1 << 5 ;[48]
bit6AfterClr:
subi cnt, 1 ;[49]
brcs overflow ;[50]
ifioset USBIN, USBMINUS ;[51] <--- sample 6
rjmp bit6IsSet ;[52]
andi shift, ~(3 << 6) ;[53]
cpi shift, 2 ;[54]
in phase, USBIN ;[55] <- phase
brlt unstuff6c ;[56]
rjmp bit7AfterClr ;[57]
unstuff6c:
andi fix, ~(1 << 6) ;[50]
lpm ;[51]
bit6IsSet:
ifrclr phase, USBMINUS ;[54] check phase only if D- changed
lpm ;[55]
in phase, USBIN ;[56] <- phase (one cycle too late)
ori shift, 1 << 6 ;[57]
bit7AfterSet:
ifioclr USBIN, USBMINUS ;[59] <--- sample 7
rjmp bit7IsClr ;[60]
andi shift, ~(1 << 7) ;[61]
cpi shift, 4 ;[62]
in phase, USBIN ;[63] <- phase
brlt unstuff7s ;[64]
rjmp bit0AfterSet ;[65] -> [00] == [67]
unstuff7s:
andi fix, ~(1 << 7) ;[58]
nop ;[59]
rjmp bit7IsClr ;[60]
macro POP_STANDARD ; 14 cycles
pop r0
pop cnt
pop x3
pop x2
pop x1
pop shift
pop YH
endm
macro POP_RETI ; 5 cycles
pop YL
out SREG, YL
pop YL
endm
#include "asmcommon.inc"
;----------------------------------------------------------------------------
; Transmitting data
;----------------------------------------------------------------------------
txByteLoop:
txBitloop:
stuffN1Delay: ; [03]
ror shift ;[-5] [11] [63]
brcc doExorN1 ;[-4] [64]
subi x3, 1 ;[-3]
brne commonN1 ;[-2]
lsl shift ;[-1] compensate ror after rjmp stuffDelay
nop ;[00] stuffing consists of just waiting 8 cycles
rjmp stuffN1Delay ;[01] after ror, C bit is reliably clear
sendNakAndReti:
ldi cnt, USBPID_NAK ;[-19]
rjmp sendCntAndReti ;[-18]
sendAckAndReti:
ldi cnt, USBPID_ACK ;[-17]
sendCntAndReti:
mov r0, cnt ;[-16]
ldi YL, 0 ;[-15] R0 address is 0
ldi YH, 0 ;[-14]
ldi cnt, 2 ;[-13]
; rjmp usbSendAndReti fallthrough
; USB spec says:
; idle = J
; J = (D+ = 0), (D- = 1) or USBOUT = 0x01
; K = (D+ = 1), (D- = 0) or USBOUT = 0x02
; Spec allows 7.5 bit times from EOP to SOP for replies (= 60 cycles)
;usbSend:
;pointer to data in 'Y'
;number of bytes in 'cnt' -- including sync byte
;uses: x1...x3, shift, cnt, Y [x1 = mirror USBOUT, x2 = USBMASK, x3 = bitstuff cnt]
;Numbers in brackets are time since first bit of sync pattern is sent (start of instruction)
usbSendAndReti:
in x2, USBDDR ;[-10] 10 cycles until SOP
ori x2, USBMASK ;[-9]
sbi USBOUT, USBMINUS ;[-8] prepare idle state; D+ and D- must have been 0 (no pullups)
out USBDDR, x2 ;[-6] <--- acquire bus
in x1, USBOUT ;[-5] port mirror for tx loop
ldi shift, 0x40 ;[-4] sync byte is first byte sent (we enter loop after ror)
ldi x2, USBMASK ;[-3]
doExorN1:
eor x1, x2 ;[-2] [06] [62]
ldi x3, 6 ;[-1] [07] [63]
commonN1:
stuffN2Delay:
out USBOUT, x1 ;[00] [08] [64] <--- set bit
ror shift ;[01]
brcc doExorN2 ;[02]
subi x3, 1 ;[03]
brne commonN2 ;[04]
lsl shift ;[05] compensate ror after rjmp stuffDelay
rjmp stuffN2Delay ;[06] after ror, C bit is reliably clear
doExorN2:
eor x1, x2 ;[04] [12]
ldi x3, 6 ;[05] [13]
commonN2:
nop2 ;[06] [14]
subi cnt, 171 ;[08] [16] trick: (3 * 171) & 0xff = 1
out USBOUT, x1 ;[09] [17] <--- set bit
brcs txBitloop ;[10] [27] [44]
stuff6Delay:
ror shift ;[45] [53]
brcc doExor6 ;[46]
subi x3, 1 ;[47]
brne common6 ;[48]
lsl shift ;[49] compensate ror after rjmp stuffDelay
nop ;[50] stuffing consists of just waiting 8 cycles
rjmp stuff6Delay ;[51] after ror, C bit is reliably clear
doExor6:
eor x1, x2 ;[48] [56]
ldi x3, 6 ;[49]
common6:
stuff7Delay:
ror shift ;[50] [58]
out USBOUT, x1 ;[51] <--- set bit
brcc doExor7 ;[52]
subi x3, 1 ;[53]
brne common7 ;[54]
lsl shift ;[55] compensate ror after rjmp stuffDelay
rjmp stuff7Delay ;[56] after ror, C bit is reliably clear
doExor7:
eor x1, x2 ;[54] [62]
ldi x3, 6 ;[55]
common7:
ld shift, y+ ;[56]
nop ;[58]
tst cnt ;[59]
out USBOUT, x1 ;[60] [00]<--- set bit
brne txByteLoop ;[61] [01]
;make SE0:
cbr x1, USBMASK ;[02] prepare SE0 [spec says EOP may be 15 to 18 cycles]
lds x2, usbNewDeviceAddr;[03]
lsl x2 ;[05] we compare with left shifted address
subi YL, 2 + 0 ;[06] Only assign address on data packets, not ACK/NAK in r0
sbci YH, 0 ;[07]
out USBOUT, x1 ;[00] <-- out SE0 -- from now 2 bits = 16 cycles until bus idle
;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm:
;set address only after data packet was sent, not after handshake
breq skipAddrAssign ;[01]
sts usbDeviceAddr, x2 ; if not skipped: SE0 is one cycle longer
skipAddrAssign:
;end of usbDeviceAddress transfer
ldi x2, 1<<USB_INTR_PENDING_BIT;[03] int0 occurred during TX -- clear pending flag
USB_STORE_PENDING(x2) ;[04]
ori x1, USBIDLE ;[05]
in x2, USBDDR ;[06]
cbr x2, USBMASK ;[07] set both pins to input
mov x3, x1 ;[08]
cbr x3, USBMASK ;[09] configure no pullup on both pins
lpm ;[10]
lpm ;[13]
out USBOUT, x1 ;[16] <-- out J (idle) -- end of SE0 (EOP signal)
out USBDDR, x2 ;[17] <-- release bus now
out USBOUT, x3 ;[18] <-- ensure no pull-up resistors are active
rjmp doReturn
/*****************************************************************************
The following PHP script generates a code skeleton for the receiver routine:
<?php
function printCmdBuffer($thisBit)
{
global $cycle;
$nextBit = ($thisBit + 1) % 8;
$s = ob_get_contents();
ob_end_clean();
$s = str_replace("#", $thisBit, $s);
$s = str_replace("@", $nextBit, $s);
$lines = explode("\n", $s);
for($i = 0; $i < count($lines); $i++){
$s = $lines[$i];
if(ereg("\\[([0-9-][0-9])\\]", $s, $regs)){
$c = $cycle + (int)$regs[1];
$s = ereg_replace("\\[[0-9-][0-9]\\]", sprintf("[%02d]", $c), $s);
}
if(strlen($s) > 0)
echo "$s\n";
}
}
function printBit($isAfterSet, $bitNum)
{
ob_start();
if($isAfterSet){
?>
ifioclr USBIN, USBMINUS ;[00] <--- sample
rjmp bit#IsClr ;[01]
andi shift, ~(7 << #) ;[02]
breq unstuff#s ;[03]
in phase, USBIN ;[04] <- phase
rjmp bit@AfterSet ;[05]
unstuff#s:
in phase, USBIN ;[05] <- phase (one cycle too late)
andi fix, ~(1 << #) ;[06]
nop2 ;[-1]
nop2 ;[01]
bit#IsClr:
ifrset phase, USBMINUS ;[03] check phase only if D- changed
lpm ;[04]
in phase, USBIN ;[05] <- phase (one cycle too late)
ori shift, 1 << # ;[06]
<?php
}else{
?>
ifioset USBIN, USBMINUS ;[00] <--- sample
rjmp bit#IsSet ;[01]
andi shift, ~(7 << #) ;[02]
breq unstuff#c ;[03]
in phase, USBIN ;[04] <- phase
rjmp bit@AfterClr ;[05]
unstuff#c:
in phase, USBIN ;[05] <- phase (one cycle too late)
andi fix, ~(1 << #) ;[06]
nop2 ;[-1]
nop2 ;[01]
bit#IsSet:
ifrclr phase, USBMINUS ;[03] check phase only if D- changed
lpm ;[04]
in phase, USBIN ;[05] <- phase (one cycle too late)
ori shift, 1 << # ;[06]
<?php
}
printCmdBuffer($bitNum);
}
$bitStartCycles = array(1, 9, 17, 26, 34, 42, 51, 59);
for($i = 0; $i < 16; $i++){
$bit = $i % 8;
$emitClrCode = ($i + (int)($i / 8)) % 2;
$cycle = $bitStartCycles[$bit];
if($emitClrCode){
printf("bit%dAfterClr:\n", $bit);
}else{
printf("bit%dAfterSet:\n", $bit);
}
ob_start();
echo " ***** ;[-1]\n";
printCmdBuffer($bit);
printBit(!$emitClrCode, $bit);
if($i == 7)
echo "\n";
}
?>
*****************************************************************************/

422
bootloader/usbdrv/usbdrvasm15.inc Normal file
View File

@ -0,0 +1,422 @@
/* Name: usbdrvasm15.inc
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: contributed by V. Bosch
* Creation Date: 2007-08-06
* Tabsize: 4
* Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
/* Do not link this file! Link usbdrvasm.S instead, which includes the
* appropriate implementation!
*/
/*
General Description:
This file is the 15 MHz version of the asssembler part of the USB driver. It
requires a 15 MHz crystal (not a ceramic resonator and not a calibrated RC
oscillator).
See usbdrv.h for a description of the entire driver.
Since almost all of this code is timing critical, don't change unless you
really know what you are doing! Many parts require not only a maximum number
of CPU cycles, but even an exact number of cycles!
*/
;max stack usage: [ret(2), YL, SREG, YH, bitcnt, shift, x1, x2, x3, x4, cnt] = 12 bytes
;nominal frequency: 15 MHz -> 10.0 cycles per bit, 80.0 cycles per byte
; Numbers in brackets are clocks counted from center of last sync bit
; when instruction starts
;----------------------------------------------------------------------------
; order of registers pushed:
; YL, SREG [sofError] YH, shift, x1, x2, x3, bitcnt, cnt, x4
;----------------------------------------------------------------------------
USB_INTR_VECTOR:
push YL ;2 push only what is necessary to sync with edge ASAP
in YL, SREG ;1
push YL ;2
;----------------------------------------------------------------------------
; Synchronize with sync pattern:
;
; sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K]
; sync up with J to K edge during sync pattern -- use fastest possible loops
;The first part waits at most 1 bit long since we must be in sync pattern.
;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to
;waitForJ, ensure that this prerequisite is met.
waitForJ:
inc YL
sbis USBIN, USBMINUS
brne waitForJ ; just make sure we have ANY timeout
;-------------------------------------------------------------------------------
; The following code results in a sampling window of < 1/4 bit
; which meets the spec.
;-------------------------------------------------------------------------------
waitForK: ;-
sbis USBIN, USBMINUS ;1 [00] <-- sample
rjmp foundK ;2 [01]
sbis USBIN, USBMINUS ; <-- sample
rjmp foundK
sbis USBIN, USBMINUS ; <-- sample
rjmp foundK
sbis USBIN, USBMINUS ; <-- sample
rjmp foundK
sbis USBIN, USBMINUS ; <-- sample
rjmp foundK
sbis USBIN, USBMINUS ; <-- sample
rjmp foundK
#if USB_COUNT_SOF
lds YL, usbSofCount
inc YL
sts usbSofCount, YL
#endif /* USB_COUNT_SOF */
#ifdef USB_SOF_HOOK
USB_SOF_HOOK
#endif
rjmp sofError
;------------------------------------------------------------------------------
; {3, 5} after falling D- edge, average delay: 4 cycles [we want 5 for
; center sampling]
; we have 1 bit time for setup purposes, then sample again.
; Numbers in brackets are cycles from center of first sync (double K)
; bit after the instruction
;------------------------------------------------------------------------------
foundK: ;- [02]
lds YL, usbInputBufOffset;2 [03+04] tx loop
push YH ;2 [05+06]
clr YH ;1 [07]
subi YL, lo8(-(usbRxBuf)) ;1 [08] [rx loop init]
sbci YH, hi8(-(usbRxBuf)) ;1 [09] [rx loop init]
push shift ;2 [10+11]
ser shift ;1 [12]
sbis USBIN, USBMINUS ;1 [-1] [13] <--sample:we want two bits K (sample 1 cycle too early)
rjmp haveTwoBitsK ;2 [00] [14]
pop shift ;2 [15+16] undo the push from before
pop YH ;2 [17+18] undo the push from before
rjmp waitForK ;2 [19+20] this was not the end of sync, retry
; The entire loop from waitForK until rjmp waitForK above must not exceed two
; bit times (= 20 cycles).
;----------------------------------------------------------------------------
; push more registers and initialize values while we sample the first bits:
;----------------------------------------------------------------------------
haveTwoBitsK: ;- [01]
push x1 ;2 [02+03]
push x2 ;2 [04+05]
push x3 ;2 [06+07]
push bitcnt ;2 [08+09]
in x1, USBIN ;1 [00] [10] <-- sample bit 0
bst x1, USBMINUS ;1 [01]
bld shift, 0 ;1 [02]
push cnt ;2 [03+04]
ldi cnt, USB_BUFSIZE ;1 [05]
push x4 ;2 [06+07] tx loop
rjmp rxLoop ;2 [08]
;----------------------------------------------------------------------------
; Receiver loop (numbers in brackets are cycles within byte after instr)
;----------------------------------------------------------------------------
unstuff0: ;- [07] (branch taken)
andi x3, ~0x01 ;1 [08]
mov x1, x2 ;1 [09] x2 contains last sampled (stuffed) bit
in x2, USBIN ;1 [00] [10] <-- sample bit 1 again
andi x2, USBMASK ;1 [01]
breq se0Hop ;1 [02] SE0 check for bit 1
ori shift, 0x01 ;1 [03] 0b00000001
nop ;1 [04]
rjmp didUnstuff0 ;2 [05]
;-----------------------------------------------------
unstuff1: ;- [05] (branch taken)
mov x2, x1 ;1 [06] x1 contains last sampled (stuffed) bit
andi x3, ~0x02 ;1 [07]
ori shift, 0x02 ;1 [08] 0b00000010
nop ;1 [09]
in x1, USBIN ;1 [00] [10] <-- sample bit 2 again
andi x1, USBMASK ;1 [01]
breq se0Hop ;1 [02] SE0 check for bit 2
rjmp didUnstuff1 ;2 [03]
;-----------------------------------------------------
unstuff2: ;- [05] (branch taken)
andi x3, ~0x04 ;1 [06]
ori shift, 0x04 ;1 [07] 0b00000100
mov x1, x2 ;1 [08] x2 contains last sampled (stuffed) bit
nop ;1 [09]
in x2, USBIN ;1 [00] [10] <-- sample bit 3
andi x2, USBMASK ;1 [01]
breq se0Hop ;1 [02] SE0 check for bit 3
rjmp didUnstuff2 ;2 [03]
;-----------------------------------------------------
unstuff3: ;- [00] [10] (branch taken)
in x2, USBIN ;1 [01] [11] <-- sample stuffed bit 3 one cycle too late
andi x2, USBMASK ;1 [02]
breq se0Hop ;1 [03] SE0 check for stuffed bit 3
andi x3, ~0x08 ;1 [04]
ori shift, 0x08 ;1 [05] 0b00001000
rjmp didUnstuff3 ;2 [06]
;----------------------------------------------------------------------------
; extra jobs done during bit interval:
;
; bit 0: store, clear [SE0 is unreliable here due to bit dribbling in hubs],
; overflow check, jump to the head of rxLoop
; bit 1: SE0 check
; bit 2: SE0 check, recovery from delay [bit 0 tasks took too long]
; bit 3: SE0 check, recovery from delay [bit 0 tasks took too long]
; bit 4: SE0 check, none
; bit 5: SE0 check, none
; bit 6: SE0 check, none
; bit 7: SE0 check, reconstruct: x3 is 0 at bit locations we changed, 1 at others
;----------------------------------------------------------------------------
rxLoop: ;- [09]
in x2, USBIN ;1 [00] [10] <-- sample bit 1 (or possibly bit 0 stuffed)
andi x2, USBMASK ;1 [01]
brne SkipSe0Hop ;1 [02]
se0Hop: ;- [02]
rjmp se0 ;2 [03] SE0 check for bit 1
SkipSe0Hop: ;- [03]
ser x3 ;1 [04]
andi shift, 0xf9 ;1 [05] 0b11111001
breq unstuff0 ;1 [06]
didUnstuff0: ;- [06]
eor x1, x2 ;1 [07]
bst x1, USBMINUS ;1 [08]
bld shift, 1 ;1 [09]
in x1, USBIN ;1 [00] [10] <-- sample bit 2 (or possibly bit 1 stuffed)
andi x1, USBMASK ;1 [01]
breq se0Hop ;1 [02] SE0 check for bit 2
andi shift, 0xf3 ;1 [03] 0b11110011
breq unstuff1 ;1 [04] do remaining work for bit 1
didUnstuff1: ;- [04]
eor x2, x1 ;1 [05]
bst x2, USBMINUS ;1 [06]
bld shift, 2 ;1 [07]
nop2 ;2 [08+09]
in x2, USBIN ;1 [00] [10] <-- sample bit 3 (or possibly bit 2 stuffed)
andi x2, USBMASK ;1 [01]
breq se0Hop ;1 [02] SE0 check for bit 3
andi shift, 0xe7 ;1 [03] 0b11100111
breq unstuff2 ;1 [04]
didUnstuff2: ;- [04]
eor x1, x2 ;1 [05]
bst x1, USBMINUS ;1 [06]
bld shift, 3 ;1 [07]
didUnstuff3: ;- [07]
andi shift, 0xcf ;1 [08] 0b11001111
breq unstuff3 ;1 [09]
in x1, USBIN ;1 [00] [10] <-- sample bit 4
andi x1, USBMASK ;1 [01]
breq se0Hop ;1 [02] SE0 check for bit 4
eor x2, x1 ;1 [03]
bst x2, USBMINUS ;1 [04]
bld shift, 4 ;1 [05]
didUnstuff4: ;- [05]
andi shift, 0x9f ;1 [06] 0b10011111
breq unstuff4 ;1 [07]
nop2 ;2 [08+09]
in x2, USBIN ;1 [00] [10] <-- sample bit 5
andi x2, USBMASK ;1 [01]
breq se0 ;1 [02] SE0 check for bit 5
eor x1, x2 ;1 [03]
bst x1, USBMINUS ;1 [04]
bld shift, 5 ;1 [05]
didUnstuff5: ;- [05]
andi shift, 0x3f ;1 [06] 0b00111111
breq unstuff5 ;1 [07]
nop2 ;2 [08+09]
in x1, USBIN ;1 [00] [10] <-- sample bit 6
andi x1, USBMASK ;1 [01]
breq se0 ;1 [02] SE0 check for bit 6
eor x2, x1 ;1 [03]
bst x2, USBMINUS ;1 [04]
bld shift, 6 ;1 [05]
didUnstuff6: ;- [05]
cpi shift, 0x02 ;1 [06] 0b00000010
brlo unstuff6 ;1 [07]
nop2 ;2 [08+09]
in x2, USBIN ;1 [00] [10] <-- sample bit 7
andi x2, USBMASK ;1 [01]
breq se0 ;1 [02] SE0 check for bit 7
eor x1, x2 ;1 [03]
bst x1, USBMINUS ;1 [04]
bld shift, 7 ;1 [05]
didUnstuff7: ;- [05]
cpi shift, 0x04 ;1 [06] 0b00000100
brlo unstuff7 ;1 [07]
eor x3, shift ;1 [08] reconstruct: x3 is 0 at bit locations we changed, 1 at others
nop ;1 [09]
in x1, USBIN ;1 [00] [10] <-- sample bit 0
st y+, x3 ;2 [01+02] store data
eor x2, x1 ;1 [03]
bst x2, USBMINUS ;1 [04]
bld shift, 0 ;1 [05]
subi cnt, 1 ;1 [06]
brcs overflow ;1 [07]
rjmp rxLoop ;2 [08]
;-----------------------------------------------------
unstuff4: ;- [08]
andi x3, ~0x10 ;1 [09]
in x1, USBIN ;1 [00] [10] <-- sample stuffed bit 4
andi x1, USBMASK ;1 [01]
breq se0 ;1 [02] SE0 check for stuffed bit 4
ori shift, 0x10 ;1 [03]
rjmp didUnstuff4 ;2 [04]
;-----------------------------------------------------
unstuff5: ;- [08]
ori shift, 0x20 ;1 [09]
in x2, USBIN ;1 [00] [10] <-- sample stuffed bit 5
andi x2, USBMASK ;1 [01]
breq se0 ;1 [02] SE0 check for stuffed bit 5
andi x3, ~0x20 ;1 [03]
rjmp didUnstuff5 ;2 [04]
;-----------------------------------------------------
unstuff6: ;- [08]
andi x3, ~0x40 ;1 [09]
in x1, USBIN ;1 [00] [10] <-- sample stuffed bit 6
andi x1, USBMASK ;1 [01]
breq se0 ;1 [02] SE0 check for stuffed bit 6
ori shift, 0x40 ;1 [03]
rjmp didUnstuff6 ;2 [04]
;-----------------------------------------------------
unstuff7: ;- [08]
andi x3, ~0x80 ;1 [09]
in x2, USBIN ;1 [00] [10] <-- sample stuffed bit 7
andi x2, USBMASK ;1 [01]
breq se0 ;1 [02] SE0 check for stuffed bit 7
ori shift, 0x80 ;1 [03]
rjmp didUnstuff7 ;2 [04]
macro POP_STANDARD ; 16 cycles
pop x4
pop cnt
pop bitcnt
pop x3
pop x2
pop x1
pop shift
pop YH
endm
macro POP_RETI ; 5 cycles
pop YL
out SREG, YL
pop YL
endm
#include "asmcommon.inc"
;---------------------------------------------------------------------------
; USB spec says:
; idle = J
; J = (D+ = 0), (D- = 1)
; K = (D+ = 1), (D- = 0)
; Spec allows 7.5 bit times from EOP to SOP for replies
;---------------------------------------------------------------------------
bitstuffN: ;- [04]
eor x1, x4 ;1 [05]
clr x2 ;1 [06]
nop ;1 [07]
rjmp didStuffN ;1 [08]
;---------------------------------------------------------------------------
bitstuff6: ;- [04]
eor x1, x4 ;1 [05]
clr x2 ;1 [06]
rjmp didStuff6 ;1 [07]
;---------------------------------------------------------------------------
bitstuff7: ;- [02]
eor x1, x4 ;1 [03]
clr x2 ;1 [06]
nop ;1 [05]
rjmp didStuff7 ;1 [06]
;---------------------------------------------------------------------------
sendNakAndReti: ;- [-19]
ldi x3, USBPID_NAK ;1 [-18]
rjmp sendX3AndReti ;1 [-17]
;---------------------------------------------------------------------------
sendAckAndReti: ;- [-17]
ldi cnt, USBPID_ACK ;1 [-16]
sendCntAndReti: ;- [-16]
mov x3, cnt ;1 [-15]
sendX3AndReti: ;- [-15]
ldi YL, 20 ;1 [-14] x3==r20 address is 20
ldi YH, 0 ;1 [-13]
ldi cnt, 2 ;1 [-12]
; rjmp usbSendAndReti fallthrough
;---------------------------------------------------------------------------
;usbSend:
;pointer to data in 'Y'
;number of bytes in 'cnt' -- including sync byte [range 2 ... 12]
;uses: x1...x4, btcnt, shift, cnt, Y
;Numbers in brackets are time since first bit of sync pattern is sent
;We need not to match the transfer rate exactly because the spec demands
;only 1.5% precision anyway.
usbSendAndReti: ;- [-13] 13 cycles until SOP
in x2, USBDDR ;1 [-12]
ori x2, USBMASK ;1 [-11]
sbi USBOUT, USBMINUS ;2 [-09-10] prepare idle state; D+ and D- must have been 0 (no pullups)
in x1, USBOUT ;1 [-08] port mirror for tx loop
out USBDDR, x2 ;1 [-07] <- acquire bus
; need not init x2 (bitstuff history) because sync starts with 0
ldi x4, USBMASK ;1 [-06] exor mask
ldi shift, 0x80 ;1 [-05] sync byte is first byte sent
ldi bitcnt, 6 ;1 [-04]
txBitLoop: ;- [-04] [06]
sbrs shift, 0 ;1 [-03] [07]
eor x1, x4 ;1 [-02] [08]
ror shift ;1 [-01] [09]
didStuffN: ;- [09]
out USBOUT, x1 ;1 [00] [10] <-- out N
ror x2 ;1 [01]
cpi x2, 0xfc ;1 [02]
brcc bitstuffN ;1 [03]
dec bitcnt ;1 [04]
brne txBitLoop ;1 [05]
sbrs shift, 0 ;1 [06]
eor x1, x4 ;1 [07]
ror shift ;1 [08]
didStuff6: ;- [08]
nop ;1 [09]
out USBOUT, x1 ;1 [00] [10] <-- out 6
ror x2 ;1 [01]
cpi x2, 0xfc ;1 [02]
brcc bitstuff6 ;1 [03]
sbrs shift, 0 ;1 [04]
eor x1, x4 ;1 [05]
ror shift ;1 [06]
ror x2 ;1 [07]
didStuff7: ;- [07]
ldi bitcnt, 6 ;1 [08]
cpi x2, 0xfc ;1 [09]
out USBOUT, x1 ;1 [00] [10] <-- out 7
brcc bitstuff7 ;1 [01]
ld shift, y+ ;2 [02+03]
dec cnt ;1 [04]
brne txBitLoop ;1 [05]
makeSE0:
cbr x1, USBMASK ;1 [06] prepare SE0 [spec says EOP may be 19 to 23 cycles]
lds x2, usbNewDeviceAddr;2 [07+08]
lsl x2 ;1 [09] we compare with left shifted address
;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm:
;set address only after data packet was sent, not after handshake
out USBOUT, x1 ;1 [00] [10] <-- out SE0-- from now 2 bits==20 cycl. until bus idle
subi YL, 20 + 2 ;1 [01] Only assign address on data packets, not ACK/NAK in x3
sbci YH, 0 ;1 [02]
breq skipAddrAssign ;1 [03]
sts usbDeviceAddr, x2 ;2 [04+05] if not skipped: SE0 is one cycle longer
;----------------------------------------------------------------------------
;end of usbDeviceAddress transfer
skipAddrAssign: ;- [03/04]
ldi x2, 1<<USB_INTR_PENDING_BIT ;1 [05] int0 occurred during TX -- clear pending flag
USB_STORE_PENDING(x2) ;1 [06]
ori x1, USBIDLE ;1 [07]
in x2, USBDDR ;1 [08]
cbr x2, USBMASK ;1 [09] set both pins to input
mov x3, x1 ;1 [10]
cbr x3, USBMASK ;1 [11] configure no pullup on both pins
ldi x4, 3 ;1 [12]
se0Delay: ;- [12] [15]
dec x4 ;1 [13] [16]
brne se0Delay ;1 [14] [17]
nop2 ;2 [18+19]
out USBOUT, x1 ;1 [20] <--out J (idle) -- end of SE0 (EOP sig.)
out USBDDR, x2 ;1 [21] <--release bus now
out USBOUT, x3 ;1 [22] <--ensure no pull-up resistors are active
rjmp doReturn ;1 [23]
;---------------------------------------------------------------------------

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/* Name: usbdrvasm16.inc
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Christian Starkjohann
* Creation Date: 2007-06-15
* Tabsize: 4
* Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
/* Do not link this file! Link usbdrvasm.S instead, which includes the
* appropriate implementation!
*/
/*
General Description:
This file is the 16 MHz version of the asssembler part of the USB driver. It
requires a 16 MHz crystal (not a ceramic resonator and not a calibrated RC
oscillator).
See usbdrv.h for a description of the entire driver.
Since almost all of this code is timing critical, don't change unless you
really know what you are doing! Many parts require not only a maximum number
of CPU cycles, but even an exact number of cycles!
*/
;max stack usage: [ret(2), YL, SREG, YH, bitcnt, shift, x1, x2, x3, x4, cnt] = 12 bytes
;nominal frequency: 16 MHz -> 10.6666666 cycles per bit, 85.333333333 cycles per byte
; Numbers in brackets are clocks counted from center of last sync bit
; when instruction starts
USB_INTR_VECTOR:
;order of registers pushed: YL, SREG YH, [sofError], bitcnt, shift, x1, x2, x3, x4, cnt
push YL ;[-25] push only what is necessary to sync with edge ASAP
in YL, SREG ;[-23]
push YL ;[-22]
push YH ;[-20]
;----------------------------------------------------------------------------
; Synchronize with sync pattern:
;----------------------------------------------------------------------------
;sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K]
;sync up with J to K edge during sync pattern -- use fastest possible loops
;The first part waits at most 1 bit long since we must be in sync pattern.
;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to
;waitForJ, ensure that this prerequisite is met.
waitForJ:
inc YL
sbis USBIN, USBMINUS
brne waitForJ ; just make sure we have ANY timeout
waitForK:
;The following code results in a sampling window of < 1/4 bit which meets the spec.
sbis USBIN, USBMINUS ;[-15]
rjmp foundK ;[-14]
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
#if USB_COUNT_SOF
lds YL, usbSofCount
inc YL
sts usbSofCount, YL
#endif /* USB_COUNT_SOF */
#ifdef USB_SOF_HOOK
USB_SOF_HOOK
#endif
rjmp sofError
foundK: ;[-12]
;{3, 5} after falling D- edge, average delay: 4 cycles [we want 5 for center sampling]
;we have 1 bit time for setup purposes, then sample again. Numbers in brackets
;are cycles from center of first sync (double K) bit after the instruction
push bitcnt ;[-12]
; [---] ;[-11]
lds YL, usbInputBufOffset;[-10]
; [---] ;[-9]
clr YH ;[-8]
subi YL, lo8(-(usbRxBuf));[-7] [rx loop init]
sbci YH, hi8(-(usbRxBuf));[-6] [rx loop init]
push shift ;[-5]
; [---] ;[-4]
ldi bitcnt, 0x55 ;[-3] [rx loop init]
sbis USBIN, USBMINUS ;[-2] we want two bits K (sample 2 cycles too early)
rjmp haveTwoBitsK ;[-1]
pop shift ;[0] undo the push from before
pop bitcnt ;[2] undo the push from before
rjmp waitForK ;[4] this was not the end of sync, retry
; The entire loop from waitForK until rjmp waitForK above must not exceed two
; bit times (= 21 cycles).
;----------------------------------------------------------------------------
; push more registers and initialize values while we sample the first bits:
;----------------------------------------------------------------------------
haveTwoBitsK:
push x1 ;[1]
push x2 ;[3]
push x3 ;[5]
ldi shift, 0 ;[7]
ldi x3, 1<<4 ;[8] [rx loop init] first sample is inverse bit, compensate that
push x4 ;[9] == leap
in x1, USBIN ;[11] <-- sample bit 0
andi x1, USBMASK ;[12]
bst x1, USBMINUS ;[13]
bld shift, 7 ;[14]
push cnt ;[15]
ldi leap, 0 ;[17] [rx loop init]
ldi cnt, USB_BUFSIZE;[18] [rx loop init]
rjmp rxbit1 ;[19] arrives at [21]
;----------------------------------------------------------------------------
; Receiver loop (numbers in brackets are cycles within byte after instr)
;----------------------------------------------------------------------------
; duration of unstuffing code should be 10.66666667 cycles. We adjust "leap"
; accordingly to approximate this value in the long run.
unstuff6:
andi x2, USBMASK ;[03]
ori x3, 1<<6 ;[04] will not be shifted any more
andi shift, ~0x80;[05]
mov x1, x2 ;[06] sampled bit 7 is actually re-sampled bit 6
subi leap, -1 ;[07] total duration = 11 bits -> subtract 1/3
rjmp didUnstuff6 ;[08]
unstuff7:
ori x3, 1<<7 ;[09] will not be shifted any more
in x2, USBIN ;[00] [10] re-sample bit 7
andi x2, USBMASK ;[01]
andi shift, ~0x80;[02]
subi leap, 2 ;[03] total duration = 10 bits -> add 1/3
rjmp didUnstuff7 ;[04]
unstuffEven:
ori x3, 1<<6 ;[09] will be shifted right 6 times for bit 0
in x1, USBIN ;[00] [10]
andi shift, ~0x80;[01]
andi x1, USBMASK ;[02]
breq se0 ;[03]
subi leap, -1 ;[04] total duration = 11 bits -> subtract 1/3
nop2 ;[05]
rjmp didUnstuffE ;[06]
unstuffOdd:
ori x3, 1<<5 ;[09] will be shifted right 4 times for bit 1
in x2, USBIN ;[00] [10]
andi shift, ~0x80;[01]
andi x2, USBMASK ;[02]
breq se0 ;[03]
subi leap, -1 ;[04] total duration = 11 bits -> subtract 1/3
nop2 ;[05]
rjmp didUnstuffO ;[06]
rxByteLoop:
andi x1, USBMASK ;[03]
eor x2, x1 ;[04]
subi leap, 1 ;[05]
brpl skipLeap ;[06]
subi leap, -3 ;1 one leap cycle every 3rd byte -> 85 + 1/3 cycles per byte
nop ;1
skipLeap:
subi x2, 1 ;[08]
ror shift ;[09]
didUnstuff6:
cpi shift, 0xfc ;[10]
in x2, USBIN ;[00] [11] <-- sample bit 7
brcc unstuff6 ;[01]
andi x2, USBMASK ;[02]
eor x1, x2 ;[03]
subi x1, 1 ;[04]
ror shift ;[05]
didUnstuff7:
cpi shift, 0xfc ;[06]
brcc unstuff7 ;[07]
eor x3, shift ;[08] reconstruct: x3 is 1 at bit locations we changed, 0 at others
st y+, x3 ;[09] store data
rxBitLoop:
in x1, USBIN ;[00] [11] <-- sample bit 0/2/4
andi x1, USBMASK ;[01]
eor x2, x1 ;[02]
andi x3, 0x3f ;[03] topmost two bits reserved for 6 and 7
subi x2, 1 ;[04]
ror shift ;[05]
cpi shift, 0xfc ;[06]
brcc unstuffEven ;[07]
didUnstuffE:
lsr x3 ;[08]
lsr x3 ;[09]
rxbit1:
in x2, USBIN ;[00] [10] <-- sample bit 1/3/5
andi x2, USBMASK ;[01]
breq se0 ;[02]
eor x1, x2 ;[03]
subi x1, 1 ;[04]
ror shift ;[05]
cpi shift, 0xfc ;[06]
brcc unstuffOdd ;[07]
didUnstuffO:
subi bitcnt, 0xab;[08] == addi 0x55, 0x55 = 0x100/3
brcs rxBitLoop ;[09]
subi cnt, 1 ;[10]
in x1, USBIN ;[00] [11] <-- sample bit 6
brcc rxByteLoop ;[01]
rjmp overflow
macro POP_STANDARD ; 14 cycles
pop cnt
pop x4
pop x3
pop x2
pop x1
pop shift
pop bitcnt
endm
macro POP_RETI ; 7 cycles
pop YH
pop YL
out SREG, YL
pop YL
endm
#include "asmcommon.inc"
; USB spec says:
; idle = J
; J = (D+ = 0), (D- = 1)
; K = (D+ = 1), (D- = 0)
; Spec allows 7.5 bit times from EOP to SOP for replies
bitstuffN:
eor x1, x4 ;[5]
ldi x2, 0 ;[6]
nop2 ;[7]
nop ;[9]
out USBOUT, x1 ;[10] <-- out
rjmp didStuffN ;[0]
bitstuff6:
eor x1, x4 ;[5]
ldi x2, 0 ;[6] Carry is zero due to brcc
rol shift ;[7] compensate for ror shift at branch destination
rjmp didStuff6 ;[8]
bitstuff7:
ldi x2, 0 ;[2] Carry is zero due to brcc
rjmp didStuff7 ;[3]
sendNakAndReti:
ldi x3, USBPID_NAK ;[-18]
rjmp sendX3AndReti ;[-17]
sendAckAndReti:
ldi cnt, USBPID_ACK ;[-17]
sendCntAndReti:
mov x3, cnt ;[-16]
sendX3AndReti:
ldi YL, 20 ;[-15] x3==r20 address is 20
ldi YH, 0 ;[-14]
ldi cnt, 2 ;[-13]
; rjmp usbSendAndReti fallthrough
;usbSend:
;pointer to data in 'Y'
;number of bytes in 'cnt' -- including sync byte [range 2 ... 12]
;uses: x1...x4, btcnt, shift, cnt, Y
;Numbers in brackets are time since first bit of sync pattern is sent
;We don't match the transfer rate exactly (don't insert leap cycles every third
;byte) because the spec demands only 1.5% precision anyway.
usbSendAndReti: ; 12 cycles until SOP
in x2, USBDDR ;[-12]
ori x2, USBMASK ;[-11]
sbi USBOUT, USBMINUS;[-10] prepare idle state; D+ and D- must have been 0 (no pullups)
in x1, USBOUT ;[-8] port mirror for tx loop
out USBDDR, x2 ;[-7] <- acquire bus
; need not init x2 (bitstuff history) because sync starts with 0
ldi x4, USBMASK ;[-6] exor mask
ldi shift, 0x80 ;[-5] sync byte is first byte sent
txByteLoop:
ldi bitcnt, 0x35 ;[-4] [6] binary 0011 0101
txBitLoop:
sbrs shift, 0 ;[-3] [7]
eor x1, x4 ;[-2] [8]
out USBOUT, x1 ;[-1] [9] <-- out N
ror shift ;[0] [10]
ror x2 ;[1]
didStuffN:
cpi x2, 0xfc ;[2]
brcc bitstuffN ;[3]
lsr bitcnt ;[4]
brcc txBitLoop ;[5]
brne txBitLoop ;[6]
sbrs shift, 0 ;[7]
eor x1, x4 ;[8]
didStuff6:
out USBOUT, x1 ;[-1] [9] <-- out 6
ror shift ;[0] [10]
ror x2 ;[1]
cpi x2, 0xfc ;[2]
brcc bitstuff6 ;[3]
ror shift ;[4]
didStuff7:
ror x2 ;[5]
sbrs x2, 7 ;[6]
eor x1, x4 ;[7]
nop ;[8]
cpi x2, 0xfc ;[9]
out USBOUT, x1 ;[-1][10] <-- out 7
brcc bitstuff7 ;[0] [11]
ld shift, y+ ;[1]
dec cnt ;[3]
brne txByteLoop ;[4]
;make SE0:
cbr x1, USBMASK ;[5] prepare SE0 [spec says EOP may be 21 to 25 cycles]
lds x2, usbNewDeviceAddr;[6]
lsl x2 ;[8] we compare with left shifted address
subi YL, 20 + 2 ;[9] Only assign address on data packets, not ACK/NAK in x3
sbci YH, 0 ;[10]
out USBOUT, x1 ;[11] <-- out SE0 -- from now 2 bits = 22 cycles until bus idle
;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm:
;set address only after data packet was sent, not after handshake
breq skipAddrAssign ;[0]
sts usbDeviceAddr, x2; if not skipped: SE0 is one cycle longer
skipAddrAssign:
;end of usbDeviceAddress transfer
ldi x2, 1<<USB_INTR_PENDING_BIT;[2] int0 occurred during TX -- clear pending flag
USB_STORE_PENDING(x2) ;[3]
ori x1, USBIDLE ;[4]
in x2, USBDDR ;[5]
cbr x2, USBMASK ;[6] set both pins to input
mov x3, x1 ;[7]
cbr x3, USBMASK ;[8] configure no pullup on both pins
ldi x4, 4 ;[9]
se0Delay:
dec x4 ;[10] [13] [16] [19]
brne se0Delay ;[11] [14] [17] [20]
out USBOUT, x1 ;[21] <-- out J (idle) -- end of SE0 (EOP signal)
out USBDDR, x2 ;[22] <-- release bus now
out USBOUT, x3 ;[23] <-- ensure no pull-up resistors are active
rjmp doReturn

452
bootloader/usbdrv/usbdrvasm165.inc Normal file
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/* Name: usbdrvasm165.inc
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Christian Starkjohann
* Creation Date: 2007-04-22
* Tabsize: 4
* Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
/* Do not link this file! Link usbdrvasm.S instead, which includes the
* appropriate implementation!
*/
/*
General Description:
This file is the 16.5 MHz version of the USB driver. It is intended for the
ATTiny45 and similar controllers running on 16.5 MHz internal RC oscillator.
This version contains a phase locked loop in the receiver routine to cope with
slight clock rate deviations of up to +/- 1%.
See usbdrv.h for a description of the entire driver.
Since almost all of this code is timing critical, don't change unless you
really know what you are doing! Many parts require not only a maximum number
of CPU cycles, but even an exact number of cycles!
*/
;Software-receiver engine. Strict timing! Don't change unless you can preserve timing!
;interrupt response time: 4 cycles + insn running = 7 max if interrupts always enabled
;max allowable interrupt latency: 59 cycles -> max 52 cycles interrupt disable
;max stack usage: [ret(2), r0, SREG, YL, YH, shift, x1, x2, x3, x4, cnt] = 12 bytes
;nominal frequency: 16.5 MHz -> 11 cycles per bit
; 16.3125 MHz < F_CPU < 16.6875 MHz (+/- 1.1%)
; Numbers in brackets are clocks counted from center of last sync bit
; when instruction starts
USB_INTR_VECTOR:
;order of registers pushed: YL, SREG [sofError], r0, YH, shift, x1, x2, x3, x4, cnt
push YL ;[-23] push only what is necessary to sync with edge ASAP
in YL, SREG ;[-21]
push YL ;[-20]
;----------------------------------------------------------------------------
; Synchronize with sync pattern:
;----------------------------------------------------------------------------
;sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K]
;sync up with J to K edge during sync pattern -- use fastest possible loops
;The first part waits at most 1 bit long since we must be in sync pattern.
;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to
;waitForJ, ensure that this prerequisite is met.
waitForJ:
inc YL
sbis USBIN, USBMINUS
brne waitForJ ; just make sure we have ANY timeout
waitForK:
;The following code results in a sampling window of < 1/4 bit which meets the spec.
sbis USBIN, USBMINUS ;[-15]
rjmp foundK ;[-14]
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
#if USB_COUNT_SOF
lds YL, usbSofCount
inc YL
sts usbSofCount, YL
#endif /* USB_COUNT_SOF */
#ifdef USB_SOF_HOOK
USB_SOF_HOOK
#endif
rjmp sofError
foundK: ;[-12]
;{3, 5} after falling D- edge, average delay: 4 cycles [we want 5 for center sampling]
;we have 1 bit time for setup purposes, then sample again. Numbers in brackets
;are cycles from center of first sync (double K) bit after the instruction
push r0 ;[-12]
; [---] ;[-11]
push YH ;[-10]
; [---] ;[-9]
lds YL, usbInputBufOffset;[-8]
; [---] ;[-7]
clr YH ;[-6]
subi YL, lo8(-(usbRxBuf));[-5] [rx loop init]
sbci YH, hi8(-(usbRxBuf));[-4] [rx loop init]
mov r0, x2 ;[-3] [rx loop init]
sbis USBIN, USBMINUS ;[-2] we want two bits K (sample 2 cycles too early)
rjmp haveTwoBitsK ;[-1]
pop YH ;[0] undo the pushes from before
pop r0 ;[2]
rjmp waitForK ;[4] this was not the end of sync, retry
; The entire loop from waitForK until rjmp waitForK above must not exceed two
; bit times (= 22 cycles).
;----------------------------------------------------------------------------
; push more registers and initialize values while we sample the first bits:
;----------------------------------------------------------------------------
haveTwoBitsK: ;[1]
push shift ;[1]
push x1 ;[3]
push x2 ;[5]
push x3 ;[7]
ldi shift, 0xff ;[9] [rx loop init]
ori x3, 0xff ;[10] [rx loop init] == ser x3, clear zero flag
in x1, USBIN ;[11] <-- sample bit 0
bst x1, USBMINUS ;[12]
bld shift, 0 ;[13]
push x4 ;[14] == phase
; [---] ;[15]
push cnt ;[16]
; [---] ;[17]
ldi phase, 0 ;[18] [rx loop init]
ldi cnt, USB_BUFSIZE;[19] [rx loop init]
rjmp rxbit1 ;[20]
; [---] ;[21]
;----------------------------------------------------------------------------
; Receiver loop (numbers in brackets are cycles within byte after instr)
;----------------------------------------------------------------------------
/*
byte oriented operations done during loop:
bit 0: store data
bit 1: SE0 check
bit 2: overflow check
bit 3: catch up
bit 4: rjmp to achieve conditional jump range
bit 5: PLL
bit 6: catch up
bit 7: jump, fixup bitstuff
; 87 [+ 2] cycles
------------------------------------------------------------------
*/
continueWithBit5:
in x2, USBIN ;[055] <-- bit 5
eor r0, x2 ;[056]
or phase, r0 ;[057]
sbrc phase, USBMINUS ;[058]
lpm ;[059] optional nop3; modifies r0
in phase, USBIN ;[060] <-- phase
eor x1, x2 ;[061]
bst x1, USBMINUS ;[062]
bld shift, 5 ;[063]
andi shift, 0x3f ;[064]
in x1, USBIN ;[065] <-- bit 6
breq unstuff5 ;[066] *** unstuff escape
eor phase, x1 ;[067]
eor x2, x1 ;[068]
bst x2, USBMINUS ;[069]
bld shift, 6 ;[070]
didUnstuff6: ;[ ]
in r0, USBIN ;[071] <-- phase
cpi shift, 0x02 ;[072]
brlo unstuff6 ;[073] *** unstuff escape
didUnstuff5: ;[ ]
nop2 ;[074]
; [---] ;[075]
in x2, USBIN ;[076] <-- bit 7
eor x1, x2 ;[077]
bst x1, USBMINUS ;[078]
bld shift, 7 ;[079]
didUnstuff7: ;[ ]
eor r0, x2 ;[080]
or phase, r0 ;[081]
in r0, USBIN ;[082] <-- phase
cpi shift, 0x04 ;[083]
brsh rxLoop ;[084]
; [---] ;[085]
unstuff7: ;[ ]
andi x3, ~0x80 ;[085]
ori shift, 0x80 ;[086]
in x2, USBIN ;[087] <-- sample stuffed bit 7
nop ;[088]
rjmp didUnstuff7 ;[089]
; [---] ;[090]
;[080]
unstuff5: ;[067]
eor phase, x1 ;[068]
andi x3, ~0x20 ;[069]
ori shift, 0x20 ;[070]
in r0, USBIN ;[071] <-- phase
mov x2, x1 ;[072]
nop ;[073]
nop2 ;[074]
; [---] ;[075]
in x1, USBIN ;[076] <-- bit 6
eor r0, x1 ;[077]
or phase, r0 ;[078]
eor x2, x1 ;[079]
bst x2, USBMINUS ;[080]
bld shift, 6 ;[081] no need to check bitstuffing, we just had one
in r0, USBIN ;[082] <-- phase
rjmp didUnstuff5 ;[083]
; [---] ;[084]
;[074]
unstuff6: ;[074]
andi x3, ~0x40 ;[075]
in x1, USBIN ;[076] <-- bit 6 again
ori shift, 0x40 ;[077]
nop2 ;[078]
; [---] ;[079]
rjmp didUnstuff6 ;[080]
; [---] ;[081]
;[071]
unstuff0: ;[013]
eor r0, x2 ;[014]
or phase, r0 ;[015]
andi x2, USBMASK ;[016] check for SE0
in r0, USBIN ;[017] <-- phase
breq didUnstuff0 ;[018] direct jump to se0 would be too long
andi x3, ~0x01 ;[019]
ori shift, 0x01 ;[020]
mov x1, x2 ;[021] mov existing sample
in x2, USBIN ;[022] <-- bit 1 again
rjmp didUnstuff0 ;[023]
; [---] ;[024]
;[014]
unstuff1: ;[024]
eor r0, x1 ;[025]
or phase, r0 ;[026]
andi x3, ~0x02 ;[027]
in r0, USBIN ;[028] <-- phase
ori shift, 0x02 ;[029]
mov x2, x1 ;[030]
rjmp didUnstuff1 ;[031]
; [---] ;[032]
;[022]
unstuff2: ;[035]
eor r0, x2 ;[036]
or phase, r0 ;[037]
andi x3, ~0x04 ;[038]
in r0, USBIN ;[039] <-- phase
ori shift, 0x04 ;[040]
mov x1, x2 ;[041]
rjmp didUnstuff2 ;[042]
; [---] ;[043]
;[033]
unstuff3: ;[043]
in x2, USBIN ;[044] <-- bit 3 again
eor r0, x2 ;[045]
or phase, r0 ;[046]
andi x3, ~0x08 ;[047]
ori shift, 0x08 ;[048]
nop ;[049]
in r0, USBIN ;[050] <-- phase
rjmp didUnstuff3 ;[051]
; [---] ;[052]
;[042]
unstuff4: ;[053]
andi x3, ~0x10 ;[054]
in x1, USBIN ;[055] <-- bit 4 again
ori shift, 0x10 ;[056]
rjmp didUnstuff4 ;[057]
; [---] ;[058]
;[048]
rxLoop: ;[085]
eor x3, shift ;[086] reconstruct: x3 is 0 at bit locations we changed, 1 at others
in x1, USBIN ;[000] <-- bit 0
st y+, x3 ;[001]
; [---] ;[002]
eor r0, x1 ;[003]
or phase, r0 ;[004]
eor x2, x1 ;[005]
in r0, USBIN ;[006] <-- phase
ser x3 ;[007]
bst x2, USBMINUS ;[008]
bld shift, 0 ;[009]
andi shift, 0xf9 ;[010]
rxbit1: ;[ ]
in x2, USBIN ;[011] <-- bit 1
breq unstuff0 ;[012] *** unstuff escape
andi x2, USBMASK ;[013] SE0 check for bit 1
didUnstuff0: ;[ ] Z only set if we detected SE0 in bitstuff
breq se0 ;[014]
eor r0, x2 ;[015]
or phase, r0 ;[016]
in r0, USBIN ;[017] <-- phase
eor x1, x2 ;[018]
bst x1, USBMINUS ;[019]
bld shift, 1 ;[020]
andi shift, 0xf3 ;[021]
didUnstuff1: ;[ ]
in x1, USBIN ;[022] <-- bit 2
breq unstuff1 ;[023] *** unstuff escape
eor r0, x1 ;[024]
or phase, r0 ;[025]
subi cnt, 1 ;[026] overflow check
brcs overflow ;[027]
in r0, USBIN ;[028] <-- phase
eor x2, x1 ;[029]
bst x2, USBMINUS ;[030]
bld shift, 2 ;[031]
andi shift, 0xe7 ;[032]
didUnstuff2: ;[ ]
in x2, USBIN ;[033] <-- bit 3
breq unstuff2 ;[034] *** unstuff escape
eor r0, x2 ;[035]
or phase, r0 ;[036]
eor x1, x2 ;[037]
bst x1, USBMINUS ;[038]
in r0, USBIN ;[039] <-- phase
bld shift, 3 ;[040]
andi shift, 0xcf ;[041]
didUnstuff3: ;[ ]
breq unstuff3 ;[042] *** unstuff escape
nop ;[043]
in x1, USBIN ;[044] <-- bit 4
eor x2, x1 ;[045]
bst x2, USBMINUS ;[046]
bld shift, 4 ;[047]
didUnstuff4: ;[ ]
eor r0, x1 ;[048]
or phase, r0 ;[049]
in r0, USBIN ;[050] <-- phase
andi shift, 0x9f ;[051]
breq unstuff4 ;[052] *** unstuff escape
rjmp continueWithBit5;[053]
; [---] ;[054]
macro POP_STANDARD ; 16 cycles
pop cnt
pop x4
pop x3
pop x2
pop x1
pop shift
pop YH
pop r0
endm
macro POP_RETI ; 5 cycles
pop YL
out SREG, YL
pop YL
endm
#include "asmcommon.inc"
; USB spec says:
; idle = J
; J = (D+ = 0), (D- = 1)
; K = (D+ = 1), (D- = 0)
; Spec allows 7.5 bit times from EOP to SOP for replies
bitstuff7:
eor x1, x4 ;[4]
ldi x2, 0 ;[5]
nop2 ;[6] C is zero (brcc)
rjmp didStuff7 ;[8]
bitstuffN:
eor x1, x4 ;[5]
ldi x2, 0 ;[6]
lpm ;[7] 3 cycle NOP, modifies r0
out USBOUT, x1 ;[10] <-- out
rjmp didStuffN ;[0]
#define bitStatus x3
sendNakAndReti:
ldi cnt, USBPID_NAK ;[-19]
rjmp sendCntAndReti ;[-18]
sendAckAndReti:
ldi cnt, USBPID_ACK ;[-17]
sendCntAndReti:
mov r0, cnt ;[-16]
ldi YL, 0 ;[-15] R0 address is 0
ldi YH, 0 ;[-14]
ldi cnt, 2 ;[-13]
; rjmp usbSendAndReti fallthrough
;usbSend:
;pointer to data in 'Y'
;number of bytes in 'cnt' -- including sync byte [range 2 ... 12]
;uses: x1...x4, shift, cnt, Y
;Numbers in brackets are time since first bit of sync pattern is sent
usbSendAndReti: ; 12 cycles until SOP
in x2, USBDDR ;[-12]
ori x2, USBMASK ;[-11]
sbi USBOUT, USBMINUS;[-10] prepare idle state; D+ and D- must have been 0 (no pullups)
in x1, USBOUT ;[-8] port mirror for tx loop
out USBDDR, x2 ;[-7] <- acquire bus
; need not init x2 (bitstuff history) because sync starts with 0
ldi x4, USBMASK ;[-6] exor mask
ldi shift, 0x80 ;[-5] sync byte is first byte sent
ldi bitStatus, 0xff ;[-4] init bit loop counter, works for up to 12 bytes
byteloop:
bitloop:
sbrs shift, 0 ;[8] [-3]
eor x1, x4 ;[9] [-2]
out USBOUT, x1 ;[10] [-1] <-- out
ror shift ;[0]
ror x2 ;[1]
didStuffN:
cpi x2, 0xfc ;[2]
brcc bitstuffN ;[3]
nop ;[4]
subi bitStatus, 37 ;[5] 256 / 7 ~=~ 37
brcc bitloop ;[6] when we leave the loop, bitStatus has almost the initial value
sbrs shift, 0 ;[7]
eor x1, x4 ;[8]
ror shift ;[9]
didStuff7:
out USBOUT, x1 ;[10] <-- out
ror x2 ;[0]
cpi x2, 0xfc ;[1]
brcc bitstuff7 ;[2]
ld shift, y+ ;[3]
dec cnt ;[5]
brne byteloop ;[6]
;make SE0:
cbr x1, USBMASK ;[7] prepare SE0 [spec says EOP may be 21 to 25 cycles]
lds x2, usbNewDeviceAddr;[8]
lsl x2 ;[10] we compare with left shifted address
out USBOUT, x1 ;[11] <-- out SE0 -- from now 2 bits = 22 cycles until bus idle
;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm:
;set address only after data packet was sent, not after handshake
subi YL, 2 ;[0] Only assign address on data packets, not ACK/NAK in r0
sbci YH, 0 ;[1]
breq skipAddrAssign ;[2]
sts usbDeviceAddr, x2; if not skipped: SE0 is one cycle longer
skipAddrAssign:
;end of usbDeviceAddress transfer
ldi x2, 1<<USB_INTR_PENDING_BIT;[4] int0 occurred during TX -- clear pending flag
USB_STORE_PENDING(x2) ;[5]
ori x1, USBIDLE ;[6]
in x2, USBDDR ;[7]
cbr x2, USBMASK ;[8] set both pins to input
mov x3, x1 ;[9]
cbr x3, USBMASK ;[10] configure no pullup on both pins
ldi x4, 4 ;[11]
se0Delay:
dec x4 ;[12] [15] [18] [21]
brne se0Delay ;[13] [16] [19] [22]
out USBOUT, x1 ;[23] <-- out J (idle) -- end of SE0 (EOP signal)
out USBDDR, x2 ;[24] <-- release bus now
out USBOUT, x3 ;[25] <-- ensure no pull-up resistors are active
rjmp doReturn

706
bootloader/usbdrv/usbdrvasm18-crc.inc Normal file
View File

@ -0,0 +1,706 @@
/* Name: usbdrvasm18.inc
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Lukas Schrittwieser (based on 20 MHz usbdrvasm20.inc by Jeroen Benschop)
* Creation Date: 2009-01-20
* Tabsize: 4
* Copyright: (c) 2008 by Lukas Schrittwieser and OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
/* Do not link this file! Link usbdrvasm.S instead, which includes the
* appropriate implementation!
*/
/*
General Description:
This file is the 18 MHz version of the asssembler part of the USB driver. It
requires a 18 MHz crystal (not a ceramic resonator and not a calibrated RC
oscillator).
See usbdrv.h for a description of the entire driver.
Since almost all of this code is timing critical, don't change unless you
really know what you are doing! Many parts require not only a maximum number
of CPU cycles, but even an exact number of cycles!
*/
;max stack usage: [ret(2), YL, SREG, YH, [sofError], bitcnt(x5), shift, x1, x2, x3, x4, cnt, ZL, ZH] = 14 bytes
;nominal frequency: 18 MHz -> 12 cycles per bit
; Numbers in brackets are clocks counted from center of last sync bit
; when instruction starts
;register use in receive loop to receive the data bytes:
; shift assembles the byte currently being received
; x1 holds the D+ and D- line state
; x2 holds the previous line state
; cnt holds the number of bytes left in the receive buffer
; x3 holds the higher crc byte (see algorithm below)
; x4 is used as temporary register for the crc algorithm
; x5 is used for unstuffing: when unstuffing the last received bit is inverted in shift (to prevent further
; unstuffing calls. In the same time the corresponding bit in x5 is cleared to mark the bit as beening iverted
; zl lower crc value and crc table index
; zh used for crc table accesses
;--------------------------------------------------------------------------------------------------------------
; CRC mods:
; table driven crc checker, Z points to table in prog space
; ZL is the lower crc byte, x3 is the higher crc byte
; x4 is used as temp register to store different results
; the initialization of the crc register is not 0xFFFF but 0xFE54. This is because during the receipt of the
; first data byte an virtual zero data byte is added to the crc register, this results in the correct initial
; value of 0xFFFF at beginning of the second data byte before the first data byte is added to the crc.
; The magic number 0xFE54 results form the crc table: At tabH[0x54] = 0xFF = crcH (required) and
; tabL[0x54] = 0x01 -> crcL = 0x01 xor 0xFE = 0xFF
; bitcnt is renamed to x5 and is used for unstuffing purposes, the unstuffing works like in the 12MHz version
;--------------------------------------------------------------------------------------------------------------
; CRC algorithm:
; The crc register is formed by x3 (higher byte) and ZL (lower byte). The algorithm uses a 'reversed' form
; i.e. that it takes the least significant bit first and shifts to the right. So in fact the highest order
; bit seen from the polynomial devision point of view is the lsb of ZL. (If this sounds strange to you i
; propose a research on CRC :-) )
; Each data byte received is xored to ZL, the lower crc byte. This byte now builds the crc
; table index. Next the new high byte is loaded from the table and stored in x4 until we have space in x3
; (its destination).
; Afterwards the lower table is loaded from the table and stored in ZL (the old index is overwritten as
; we don't need it anymore. In fact this is a right shift by 8 bits.) Now the old crc high value is xored
; to ZL, this is the second shift of the old crc value. Now x4 (the temp reg) is moved to x3 and the crc
; calculation is done.
; Prior to the first byte the two CRC register have to be initialized to 0xFFFF (as defined in usb spec)
; however the crc engine also runs during the receipt of the first byte, therefore x3 and zl are initialized
; to a magic number which results in a crc value of 0xFFFF after the first complete byte.
;
; This algorithm is split into the extra cycles of the different bits:
; bit7: XOR the received byte to ZL
; bit5: load the new high byte to x4
; bit6: load the lower xor byte from the table, xor zl and x3, store result in zl (=the new crc low value)
; move x4 (the new high byte) to x3, the crc value is ready
;
macro POP_STANDARD ; 18 cycles
pop ZH
pop ZL
pop cnt
pop x5
pop x3
pop x2
pop x1
pop shift
pop x4
endm
macro POP_RETI ; 7 cycles
pop YH
pop YL
out SREG, YL
pop YL
endm
macro CRC_CLEANUP_AND_CHECK
; the last byte has already been xored with the lower crc byte, we have to do the table lookup and xor
; x3 is the higher crc byte, zl the lower one
ldi ZH, hi8(usbCrcTableHigh);[+1] get the new high byte from the table
lpm x2, Z ;[+2][+3][+4]
ldi ZH, hi8(usbCrcTableLow);[+5] get the new low xor byte from the table
lpm ZL, Z ;[+6][+7][+8]
eor ZL, x3 ;[+7] xor the old high byte with the value from the table, x2:ZL now holds the crc value
cpi ZL, 0x01 ;[+8] if the crc is ok we have a fixed remainder value of 0xb001 in x2:ZL (see usb spec)
brne ignorePacket ;[+9] detected a crc fault -> paket is ignored and retransmitted by the host
cpi x2, 0xb0 ;[+10]
brne ignorePacket ;[+11] detected a crc fault -> paket is ignored and retransmitted by the host
endm
USB_INTR_VECTOR:
;order of registers pushed: YL, SREG, YH, [sofError], x4, shift, x1, x2, x3, x5, cnt, ZL, ZH
push YL ;[-28] push only what is necessary to sync with edge ASAP
in YL, SREG ;[-26]
push YL ;[-25]
push YH ;[-23]
;----------------------------------------------------------------------------
; Synchronize with sync pattern:
;----------------------------------------------------------------------------
;sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K]
;sync up with J to K edge during sync pattern -- use fastest possible loops
;The first part waits at most 1 bit long since we must be in sync pattern.
;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to
;waitForJ, ensure that this prerequisite is met.
waitForJ:
inc YL
sbis USBIN, USBMINUS
brne waitForJ ; just make sure we have ANY timeout
waitForK:
;The following code results in a sampling window of < 1/4 bit which meets the spec.
sbis USBIN, USBMINUS ;[-17]
rjmp foundK ;[-16]
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
#if USB_COUNT_SOF
lds YL, usbSofCount
inc YL
sts usbSofCount, YL
#endif /* USB_COUNT_SOF */
#ifdef USB_SOF_HOOK
USB_SOF_HOOK
#endif
rjmp sofError
foundK: ;[-15]
;{3, 5} after falling D- edge, average delay: 4 cycles
;bit0 should be at 30 (2.5 bits) for center sampling. Currently at 4 so 26 cylces till bit 0 sample
;use 1 bit time for setup purposes, then sample again. Numbers in brackets
;are cycles from center of first sync (double K) bit after the instruction
push x4 ;[-14]
; [---] ;[-13]
lds YL, usbInputBufOffset;[-12] used to toggle the two usb receive buffers
; [---] ;[-11]
clr YH ;[-10]
subi YL, lo8(-(usbRxBuf));[-9] [rx loop init]
sbci YH, hi8(-(usbRxBuf));[-8] [rx loop init]
push shift ;[-7]
; [---] ;[-6]
ldi shift, 0x80 ;[-5] the last bit is the end of byte marker for the pid receiver loop
clc ;[-4] the carry has to be clear for receipt of pid bit 0
sbis USBIN, USBMINUS ;[-3] we want two bits K (sample 3 cycles too early)
rjmp haveTwoBitsK ;[-2]
pop shift ;[-1] undo the push from before
pop x4 ;[1]
rjmp waitForK ;[3] this was not the end of sync, retry
; The entire loop from waitForK until rjmp waitForK above must not exceed two
; bit times (= 24 cycles).
;----------------------------------------------------------------------------
; push more registers and initialize values while we sample the first bits:
;----------------------------------------------------------------------------
haveTwoBitsK:
push x1 ;[0]
push x2 ;[2]
push x3 ;[4] crc high byte
ldi x2, 1<<USBPLUS ;[6] [rx loop init] current line state is K state. D+=="1", D-=="0"
push x5 ;[7]
push cnt ;[9]
ldi cnt, USB_BUFSIZE ;[11]
;--------------------------------------------------------------------------------------------------------------
; receives the pid byte
; there is no real unstuffing algorithm implemented here as a stuffing bit is impossible in the pid byte.
; That's because the last four bits of the byte are the inverted of the first four bits. If we detect a
; unstuffing condition something went wrong and abort
; shift has to be initialized to 0x80
;--------------------------------------------------------------------------------------------------------------
; pid bit 0 - used for even more register saving (we need the z pointer)
in x1, USBIN ;[0] sample line state
andi x1, USBMASK ;[1] filter only D+ and D- bits
eor x2, x1 ;[2] generate inverted of actual bit
sbrc x2, USBMINUS ;[3] if the bit is set we received a zero
sec ;[4]
ror shift ;[5] we perform no unstuffing check here as this is the first bit
mov x2, x1 ;[6]
push ZL ;[7]
;[8]
push ZH ;[9]
;[10]
ldi x3, 0xFE ;[11] x3 is the high order crc value
bitloopPid:
in x1, USBIN ;[0] sample line state
andi x1, USBMASK ;[1] filter only D+ and D- bits
breq nse0 ;[2] both lines are low so handle se0
eor x2, x1 ;[3] generate inverted of actual bit
sbrc x2, USBMINUS ;[4] set the carry if we received a zero
sec ;[5]
ror shift ;[6]
ldi ZL, 0x54 ;[7] ZL is the low order crc value
ser x4 ;[8] the is no bit stuffing check here as the pid bit can't be stuffed. if so
; some error occured. In this case the paket is discarded later on anyway.
mov x2, x1 ;[9] prepare for the next cycle
brcc bitloopPid ;[10] while 0s drop out of shift we get the next bit
eor x4, shift ;[11] invert all bits in shift and store result in x4
;--------------------------------------------------------------------------------------------------------------
; receives data bytes and calculates the crc
; the last USBIN state has to be in x2
; this is only the first half, due to branch distanc limitations the second half of the loop is near the end
; of this asm file
;--------------------------------------------------------------------------------------------------------------
rxDataStart:
in x1, USBIN ;[0] sample line state (note: a se0 check is not useful due to bit dribbling)
ser x5 ;[1] prepare the unstuff marker register
eor x2, x1 ;[2] generates the inverted of the actual bit
bst x2, USBMINUS ;[3] copy the bit from x2
bld shift, 0 ;[4] and store it in shift
mov x2, shift ;[5] make a copy of shift for unstuffing check
andi x2, 0xF9 ;[6] mask the last six bits, if we got six zeros (which are six ones in fact)
breq unstuff0 ;[7] then Z is set now and we branch to the unstuffing handler
didunstuff0:
subi cnt, 1 ;[8] cannot use dec because it doesn't affect the carry flag
brcs nOverflow ;[9] Too many bytes received. Ignore packet
st Y+, x4 ;[10] store the last received byte
;[11] st needs two cycles
; bit1
in x2, USBIN ;[0] sample line state
andi x1, USBMASK ;[1] check for se0 during bit 0
breq nse0 ;[2]
andi x2, USBMASK ;[3] check se0 during bit 1
breq nse0 ;[4]
eor x1, x2 ;[5]
bst x1, USBMINUS ;[6]
bld shift, 1 ;[7]
mov x1, shift ;[8]
andi x1, 0xF3 ;[9]
breq unstuff1 ;[10]
didunstuff1:
nop ;[11]
; bit2
in x1, USBIN ;[0] sample line state
andi x1, USBMASK ;[1] check for se0 (as there is nothing else to do here
breq nOverflow ;[2]
eor x2, x1 ;[3] generates the inverted of the actual bit
bst x2, USBMINUS ;[4]
bld shift, 2 ;[5] store the bit
mov x2, shift ;[6]
andi x2, 0xE7 ;[7] if we have six zeros here (which means six 1 in the stream)
breq unstuff2 ;[8] the next bit is a stuffing bit
didunstuff2:
nop2 ;[9]
;[10]
nop ;[11]
; bit3
in x2, USBIN ;[0] sample line state
andi x2, USBMASK ;[1] check for se0
breq nOverflow ;[2]
eor x1, x2 ;[3]
bst x1, USBMINUS ;[4]
bld shift, 3 ;[5]
mov x1, shift ;[6]
andi x1, 0xCF ;[7]
breq unstuff3 ;[8]
didunstuff3:
nop ;[9]
rjmp rxDataBit4 ;[10]
;[11]
; the avr branch instructions allow an offset of +63 insturction only, so we need this
; 'local copy' of se0
nse0:
rjmp se0 ;[4]
;[5]
; the same same as for se0 is needed for overflow and StuffErr
nOverflow:
stuffErr:
rjmp overflow
unstuff0: ;[8] this is the branch delay of breq unstuffX
andi x1, USBMASK ;[9] do an se0 check here (if the last crc byte ends with 5 one's we might end up here
breq didunstuff0 ;[10] event tough the message is complete -> jump back and store the byte
ori shift, 0x01 ;[11] invert the last received bit to prevent furhter unstuffing
in x2, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors
andi x5, 0xFE ;[1] mark this bit as inverted (will be corrected before storing shift)
eor x1, x2 ;[2] x1 and x2 have to be different because the stuff bit is always a zero
andi x1, USBMASK ;[3] mask the interesting bits
breq stuffErr ;[4] if the stuff bit is a 1-bit something went wrong
mov x1, x2 ;[5] the next bit expects the last state to be in x1
rjmp didunstuff0 ;[6]
;[7] jump delay of rjmp didunstuffX
unstuff1: ;[11] this is the jump delay of breq unstuffX
in x1, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors
ori shift, 0x02 ;[1] invert the last received bit to prevent furhter unstuffing
andi x5, 0xFD ;[2] mark this bit as inverted (will be corrected before storing shift)
eor x2, x1 ;[3] x1 and x2 have to be different because the stuff bit is always a zero
andi x2, USBMASK ;[4] mask the interesting bits
breq stuffErr ;[5] if the stuff bit is a 1-bit something went wrong
mov x2, x1 ;[6] the next bit expects the last state to be in x2
nop2 ;[7]
;[8]
rjmp didunstuff1 ;[9]
;[10] jump delay of rjmp didunstuffX
unstuff2: ;[9] this is the jump delay of breq unstuffX
ori shift, 0x04 ;[10] invert the last received bit to prevent furhter unstuffing
andi x5, 0xFB ;[11] mark this bit as inverted (will be corrected before storing shift)
in x2, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors
eor x1, x2 ;[1] x1 and x2 have to be different because the stuff bit is always a zero
andi x1, USBMASK ;[2] mask the interesting bits
breq stuffErr ;[3] if the stuff bit is a 1-bit something went wrong
mov x1, x2 ;[4] the next bit expects the last state to be in x1
nop2 ;[5]
;[6]
rjmp didunstuff2 ;[7]
;[8] jump delay of rjmp didunstuffX
unstuff3: ;[9] this is the jump delay of breq unstuffX
ori shift, 0x08 ;[10] invert the last received bit to prevent furhter unstuffing
andi x5, 0xF7 ;[11] mark this bit as inverted (will be corrected before storing shift)
in x1, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors
eor x2, x1 ;[1] x1 and x2 have to be different because the stuff bit is always a zero
andi x2, USBMASK ;[2] mask the interesting bits
breq stuffErr ;[3] if the stuff bit is a 1-bit something went wrong
mov x2, x1 ;[4] the next bit expects the last state to be in x2
nop2 ;[5]
;[6]
rjmp didunstuff3 ;[7]
;[8] jump delay of rjmp didunstuffX
; the include has to be here due to branch distance restirctions
#define __USE_CRC__
#include "asmcommon.inc"
; USB spec says:
; idle = J
; J = (D+ = 0), (D- = 1)
; K = (D+ = 1), (D- = 0)
; Spec allows 7.5 bit times from EOP to SOP for replies
; 7.5 bit times is 90 cycles. ...there is plenty of time
sendNakAndReti:
ldi x3, USBPID_NAK ;[-18]
rjmp sendX3AndReti ;[-17]
sendAckAndReti:
ldi cnt, USBPID_ACK ;[-17]
sendCntAndReti:
mov x3, cnt ;[-16]
sendX3AndReti:
ldi YL, 20 ;[-15] x3==r20 address is 20
ldi YH, 0 ;[-14]
ldi cnt, 2 ;[-13]
; rjmp usbSendAndReti fallthrough
;usbSend:
;pointer to data in 'Y'
;number of bytes in 'cnt' -- including sync byte [range 2 ... 12]
;uses: x1...x4, btcnt, shift, cnt, Y
;Numbers in brackets are time since first bit of sync pattern is sent
usbSendAndReti: ; 12 cycles until SOP
in x2, USBDDR ;[-12]
ori x2, USBMASK ;[-11]
sbi USBOUT, USBMINUS;[-10] prepare idle state; D+ and D- must have been 0 (no pullups)
in x1, USBOUT ;[-8] port mirror for tx loop
out USBDDR, x2 ;[-6] <- acquire bus
ldi x2, 0 ;[-6] init x2 (bitstuff history) because sync starts with 0
ldi x4, USBMASK ;[-5] exor mask
ldi shift, 0x80 ;[-4] sync byte is first byte sent
txByteLoop:
ldi bitcnt, 0x40 ;[-3]=[9] binary 01000000
txBitLoop: ; the loop sends the first 7 bits of the byte
sbrs shift, 0 ;[-2]=[10] if we have to send a 1 don't change the line state
eor x1, x4 ;[-1]=[11]
out USBOUT, x1 ;[0]
ror shift ;[1]
ror x2 ;[2] transfers the last sent bit to the stuffing history
didStuffN:
nop ;[3]
nop ;[4]
cpi x2, 0xfc ;[5] if we sent six consecutive ones
brcc bitstuffN ;[6]
lsr bitcnt ;[7]
brne txBitLoop ;[8] restart the loop while the 1 is still in the bitcount
; transmit bit 7
sbrs shift, 0 ;[9]
eor x1, x4 ;[10]
didStuff7:
ror shift ;[11]
out USBOUT, x1 ;[0] transfer bit 7 to the pins
ror x2 ;[1] move the bit into the stuffing history
cpi x2, 0xfc ;[2]
brcc bitstuff7 ;[3]
ld shift, y+ ;[4] get next byte to transmit
dec cnt ;[5] decrement byte counter
brne txByteLoop ;[7] if we have more bytes start next one
;[8] branch delay
;make SE0:
cbr x1, USBMASK ;[8] prepare SE0 [spec says EOP may be 25 to 30 cycles]
lds x2, usbNewDeviceAddr;[9]
lsl x2 ;[11] we compare with left shifted address
out USBOUT, x1 ;[0] <-- out SE0 -- from now 2 bits = 24 cycles until bus idle
subi YL, 20 + 2 ;[1] Only assign address on data packets, not ACK/NAK in x3
sbci YH, 0 ;[2]
;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm:
;set address only after data packet was sent, not after handshake
breq skipAddrAssign ;[3]
sts usbDeviceAddr, x2 ; if not skipped: SE0 is one cycle longer
skipAddrAssign:
;end of usbDeviceAddress transfer
ldi x2, 1<<USB_INTR_PENDING_BIT;[5] int0 occurred during TX -- clear pending flag
USB_STORE_PENDING(x2) ;[6]
ori x1, USBIDLE ;[7]
in x2, USBDDR ;[8]
cbr x2, USBMASK ;[9] set both pins to input
mov x3, x1 ;[10]
cbr x3, USBMASK ;[11] configure no pullup on both pins
ldi x4, 4 ;[12]
se0Delay:
dec x4 ;[13] [16] [19] [22]
brne se0Delay ;[14] [17] [20] [23]
out USBOUT, x1 ;[24] <-- out J (idle) -- end of SE0 (EOP signal)
out USBDDR, x2 ;[25] <-- release bus now
out USBOUT, x3 ;[26] <-- ensure no pull-up resistors are active
rjmp doReturn
bitstuffN:
eor x1, x4 ;[8] generate a zero
ldi x2, 0 ;[9] reset the bit stuffing history
nop2 ;[10]
out USBOUT, x1 ;[0] <-- send the stuffing bit
rjmp didStuffN ;[1]
bitstuff7:
eor x1, x4 ;[5]
ldi x2, 0 ;[6] reset bit stuffing history
clc ;[7] fill a zero into the shift register
rol shift ;[8] compensate for ror shift at branch destination
rjmp didStuff7 ;[9]
;[10] jump delay
;--------------------------------------------------------------------------------------------------------------
; receives data bytes and calculates the crc
; second half of the data byte receiver loop
; most parts of the crc algorithm are here
;--------------------------------------------------------------------------------------------------------------
nOverflow2:
rjmp overflow
rxDataBit4:
in x1, USBIN ;[0] sample line state
andi x1, USBMASK ;[1] check for se0
breq nOverflow2 ;[2]
eor x2, x1 ;[3]
bst x2, USBMINUS ;[4]
bld shift, 4 ;[5]
mov x2, shift ;[6]
andi x2, 0x9F ;[7]
breq unstuff4 ;[8]
didunstuff4:
nop2 ;[9][10]
nop ;[11]
; bit5
in x2, USBIN ;[0] sample line state
ldi ZH, hi8(usbCrcTableHigh);[1] use the table for the higher byte
eor x1, x2 ;[2]
bst x1, USBMINUS ;[3]
bld shift, 5 ;[4]
mov x1, shift ;[5]
andi x1, 0x3F ;[6]
breq unstuff5 ;[7]
didunstuff5:
lpm x4, Z ;[8] load the higher crc xor-byte and store it for later use
;[9] lpm needs 3 cycles
;[10]
ldi ZH, hi8(usbCrcTableLow);[11] load the lower crc xor byte adress
; bit6
in x1, USBIN ;[0] sample line state
eor x2, x1 ;[1]
bst x2, USBMINUS ;[2]
bld shift, 6 ;[3]
mov x2, shift ;[4]
andi x2, 0x7E ;[5]
breq unstuff6 ;[6]
didunstuff6:
lpm ZL, Z ;[7] load the lower xor crc byte
;[8] lpm needs 3 cycles
;[9]
eor ZL, x3 ;[10] xor the old high crc byte with the low xor-byte
mov x3, x4 ;[11] move the new high order crc value from temp to its destination
; bit7
in x2, USBIN ;[0] sample line state
eor x1, x2 ;[1]
bst x1, USBMINUS ;[2]
bld shift, 7 ;[3] now shift holds the complete but inverted data byte
mov x1, shift ;[4]
andi x1, 0xFC ;[5]
breq unstuff7 ;[6]
didunstuff7:
eor x5, shift ;[7] x5 marks all bits which have not been inverted by the unstuffing subs
mov x4, x5 ;[8] keep a copy of the data byte it will be stored during next bit0
eor ZL, x4 ;[9] feed the actual byte into the crc algorithm
rjmp rxDataStart ;[10] next byte
;[11] during the reception of the next byte this one will be fed int the crc algorithm
unstuff4: ;[9] this is the jump delay of rjmp unstuffX
ori shift, 0x10 ;[10] invert the last received bit to prevent furhter unstuffing
andi x5, 0xEF ;[11] mark this bit as inverted (will be corrected before storing shift)
in x2, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors
eor x1, x2 ;[1] x1 and x2 have to be different because the stuff bit is always a zero
andi x1, USBMASK ;[2] mask the interesting bits
breq stuffErr2 ;[3] if the stuff bit is a 1-bit something went wrong
mov x1, x2 ;[4] the next bit expects the last state to be in x1
nop2 ;[5]
;[6]
rjmp didunstuff4 ;[7]
;[8] jump delay of rjmp didunstuffX
unstuff5: ;[8] this is the jump delay of rjmp unstuffX
nop ;[9]
ori shift, 0x20 ;[10] invert the last received bit to prevent furhter unstuffing
andi x5, 0xDF ;[11] mark this bit as inverted (will be corrected before storing shift)
in x1, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors
eor x2, x1 ;[1] x1 and x2 have to be different because the stuff bit is always a zero
andi x2, USBMASK ;[2] mask the interesting bits
breq stuffErr2 ;[3] if the stuff bit is a 1-bit something went wrong
mov x2, x1 ;[4] the next bit expects the last state to be in x2
nop ;[5]
rjmp didunstuff5 ;[6]
;[7] jump delay of rjmp didunstuffX
unstuff6: ;[7] this is the jump delay of rjmp unstuffX
nop2 ;[8]
;[9]
ori shift, 0x40 ;[10] invert the last received bit to prevent furhter unstuffing
andi x5, 0xBF ;[11] mark this bit as inverted (will be corrected before storing shift)
in x2, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors
eor x1, x2 ;[1] x1 and x2 have to be different because the stuff bit is always a zero
andi x1, USBMASK ;[2] mask the interesting bits
breq stuffErr2 ;[3] if the stuff bit is a 1-bit something went wrong
mov x1, x2 ;[4] the next bit expects the last state to be in x1
rjmp didunstuff6 ;[5]
;[6] jump delay of rjmp didunstuffX
unstuff7: ;[7] this is the jump delay of rjmp unstuffX
nop ;[8]
nop ;[9]
ori shift, 0x80 ;[10] invert the last received bit to prevent furhter unstuffing
andi x5, 0x7F ;[11] mark this bit as inverted (will be corrected before storing shift)
in x1, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors
eor x2, x1 ;[1] x1 and x2 have to be different because the stuff bit is always a zero
andi x2, USBMASK ;[2] mask the interesting bits
breq stuffErr2 ;[3] if the stuff bit is a 1-bit something went wrong
mov x2, x1 ;[4] the next bit expects the last state to be in x2
rjmp didunstuff7 ;[5]
;[6] jump delay of rjmp didunstuff7
; local copy of the stuffErr desitnation for the second half of the receiver loop
stuffErr2:
rjmp stuffErr
;--------------------------------------------------------------------------------------------------------------
; The crc table follows. It has to be aligned to enable a fast loading of the needed bytes.
; There are two tables of 256 entries each, the low and the high byte table.
; Table values were generated with the following C code:
/*
#include <stdio.h>
int main (int argc, char **argv)
{
int i, j;
for (i=0; i<512; i++){
unsigned short crc = i & 0xff;
for(j=0; j<8; j++) crc = (crc >> 1) ^ ((crc & 1) ? 0xa001 : 0);
if((i & 7) == 0) printf("\n.byte ");
printf("0x%02x, ", (i > 0xff ? (crc >> 8) : crc) & 0xff);
if(i == 255) printf("\n");
}
return 0;
}
// Use the following algorithm to compute CRC values:
ushort computeCrc(uchar *msg, uchar msgLen)
{
uchar i;
ushort crc = 0xffff;
for(i = 0; i < msgLen; i++)
crc = usbCrcTable16[lo8(crc) ^ msg[i]] ^ hi8(crc);
return crc;
}
*/
.balign 256
usbCrcTableLow:
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41
.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
; .balign 256
usbCrcTableHigh:
.byte 0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2
.byte 0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04
.byte 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E
.byte 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8
.byte 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A
.byte 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC
.byte 0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6
.byte 0xD2, 0x12, 0x13, 0xD3, 0x11, 0xD1, 0xD0, 0x10
.byte 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32
.byte 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4
.byte 0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE
.byte 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38
.byte 0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA
.byte 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C
.byte 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26
.byte 0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0
.byte 0xA0, 0x60, 0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62
.byte 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4
.byte 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE
.byte 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68
.byte 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA
.byte 0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C
.byte 0xB4, 0x74, 0x75, 0xB5, 0x77, 0xB7, 0xB6, 0x76
.byte 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0
.byte 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92
.byte 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54
.byte 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E
.byte 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98
.byte 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A
.byte 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C
.byte 0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86
.byte 0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80, 0x40

359
bootloader/usbdrv/usbdrvasm20.inc Normal file
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/* Name: usbdrvasm20.inc
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Jeroen Benschop
* Based on usbdrvasm16.inc from Christian Starkjohann
* Creation Date: 2008-03-05
* Tabsize: 4
* Copyright: (c) 2008 by Jeroen Benschop and OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
/* Do not link this file! Link usbdrvasm.S instead, which includes the
* appropriate implementation!
*/
/*
General Description:
This file is the 20 MHz version of the asssembler part of the USB driver. It
requires a 20 MHz crystal (not a ceramic resonator and not a calibrated RC
oscillator).
See usbdrv.h for a description of the entire driver.
Since almost all of this code is timing critical, don't change unless you
really know what you are doing! Many parts require not only a maximum number
of CPU cycles, but even an exact number of cycles!
*/
#define leap2 x3
#ifdef __IAR_SYSTEMS_ASM__
#define nextInst $+2
#else
#define nextInst .+0
#endif
;max stack usage: [ret(2), YL, SREG, YH, bitcnt, shift, x1, x2, x3, x4, cnt] = 12 bytes
;nominal frequency: 20 MHz -> 13.333333 cycles per bit, 106.666667 cycles per byte
; Numbers in brackets are clocks counted from center of last sync bit
; when instruction starts
;register use in receive loop:
; shift assembles the byte currently being received
; x1 holds the D+ and D- line state
; x2 holds the previous line state
; x4 (leap) is used to add a leap cycle once every three bytes received
; X3 (leap2) is used to add a leap cycle once every three stuff bits received
; bitcnt is used to determine when a stuff bit is due
; cnt holds the number of bytes left in the receive buffer
USB_INTR_VECTOR:
;order of registers pushed: YL, SREG YH, [sofError], bitcnt, shift, x1, x2, x3, x4, cnt
push YL ;[-28] push only what is necessary to sync with edge ASAP
in YL, SREG ;[-26]
push YL ;[-25]
push YH ;[-23]
;----------------------------------------------------------------------------
; Synchronize with sync pattern:
;----------------------------------------------------------------------------
;sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K]
;sync up with J to K edge during sync pattern -- use fastest possible loops
;The first part waits at most 1 bit long since we must be in sync pattern.
;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to
;waitForJ, ensure that this prerequisite is met.
waitForJ:
inc YL
sbis USBIN, USBMINUS
brne waitForJ ; just make sure we have ANY timeout
waitForK:
;The following code results in a sampling window of < 1/4 bit which meets the spec.
sbis USBIN, USBMINUS ;[-19]
rjmp foundK ;[-18]
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
sbis USBIN, USBMINUS
rjmp foundK
#if USB_COUNT_SOF
lds YL, usbSofCount
inc YL
sts usbSofCount, YL
#endif /* USB_COUNT_SOF */
#ifdef USB_SOF_HOOK
USB_SOF_HOOK
#endif
rjmp sofError
foundK: ;[-16]
;{3, 5} after falling D- edge, average delay: 4 cycles
;bit0 should be at 34 for center sampling. Currently at 4 so 30 cylces till bit 0 sample
;use 1 bit time for setup purposes, then sample again. Numbers in brackets
;are cycles from center of first sync (double K) bit after the instruction
push bitcnt ;[-16]
; [---] ;[-15]
lds YL, usbInputBufOffset;[-14]
; [---] ;[-13]
clr YH ;[-12]
subi YL, lo8(-(usbRxBuf));[-11] [rx loop init]
sbci YH, hi8(-(usbRxBuf));[-10] [rx loop init]
push shift ;[-9]
; [---] ;[-8]
ldi shift,0x40 ;[-7] set msb to "1" so processing bit7 can be detected
nop2 ;[-6]
; [---] ;[-5]
ldi bitcnt, 5 ;[-4] [rx loop init]
sbis USBIN, USBMINUS ;[-3] we want two bits K (sample 3 cycles too early)
rjmp haveTwoBitsK ;[-2]
pop shift ;[-1] undo the push from before
pop bitcnt ;[1]
rjmp waitForK ;[3] this was not the end of sync, retry
; The entire loop from waitForK until rjmp waitForK above must not exceed two
; bit times (= 27 cycles).
;----------------------------------------------------------------------------
; push more registers and initialize values while we sample the first bits:
;----------------------------------------------------------------------------
haveTwoBitsK:
push x1 ;[0]
push x2 ;[2]
push x3 ;[4] (leap2)
ldi leap2, 0x55 ;[6] add leap cycle on 2nd,5th,8th,... stuff bit
push x4 ;[7] == leap
ldi leap, 0x55 ;[9] skip leap cycle on 2nd,5th,8th,... byte received
push cnt ;[10]
ldi cnt, USB_BUFSIZE ;[12] [rx loop init]
ldi x2, 1<<USBPLUS ;[13] current line state is K state. D+=="1", D-=="0"
bit0:
in x1, USBIN ;[0] sample line state
andi x1, USBMASK ;[1] filter only D+ and D- bits
rjmp handleBit ;[2] make bit0 14 cycles long
;----------------------------------------------------------------------------
; Process bit7. However, bit 6 still may need unstuffing.
;----------------------------------------------------------------------------
b6checkUnstuff:
dec bitcnt ;[9]
breq unstuff6 ;[10]
bit7:
subi cnt, 1 ;[11] cannot use dec becaus it does not affect the carry flag
brcs overflow ;[12] Too many bytes received. Ignore packet
in x1, USBIN ;[0] sample line state
andi x1, USBMASK ;[1] filter only D+ and D- bits
cpse x1, x2 ;[2] when previous line state equals current line state, handle "1"
rjmp b7handle0 ;[3] when line state differs, handle "0"
sec ;[4]
ror shift ;[5] shift "1" into the data
st y+, shift ;[6] store the data into the buffer
ldi shift, 0x40 ;[7] reset data for receiving the next byte
subi leap, 0x55 ;[9] trick to introduce a leap cycle every 3 bytes
brcc nextInst ;[10 or 11] it will fail after 85 bytes. However low speed can only receive 11
dec bitcnt ;[11 or 12]
brne bit0 ;[12 or 13]
ldi x1, 1 ;[13 or 14] unstuffing bit 7
in bitcnt, USBIN ;[0] sample stuff bit
rjmp unstuff ;[1]
b7handle0:
mov x2,x1 ;[5] Set x2 to current line state
ldi bitcnt, 6 ;[6]
lsr shift ;[7] shift "0" into the data
st y+, shift ;[8] store data into the buffer
ldi shift, 0x40 ;[10] reset data for receiving the next byte
subi leap, 0x55 ;[11] trick to introduce a leap cycle every 3 bytes
brcs bit0 ;[12] it will fail after 85 bytes. However low speed can only receive 11
rjmp bit0 ;[13]
;----------------------------------------------------------------------------
; Handle unstuff
; x1==0xFF indicate unstuffing bit6
;----------------------------------------------------------------------------
unstuff6:
ldi x1,0xFF ;[12] indicate unstuffing bit 6
in bitcnt, USBIN ;[0] sample stuff bit
nop ;[1] fix timing
unstuff: ;b0-5 b6 b7
mov x2,bitcnt ;[3] [2] [3] Set x2 to match line state
subi leap2, 0x55 ;[4] [3] [4] delay loop
brcs nextInst ;[5] [4] [5] add one cycle every three stuff bits
sbci leap2,0 ;[6] [5] [6]
ldi bitcnt,6 ;[7] [6] [7] reset bit stuff counter
andi x2, USBMASK ;[8] [7] [8] only keep D+ and D-
cpi x1,0 ;[9] [8] [9]
brmi bit7 ;[10] [9] [10] finished unstuffing bit6 When x1<0
breq bitloop ;[11] --- [11] finished unstuffing bit0-5 when x1=0
nop ;--- --- [12]
in x1, USBIN ;--- --- [0] sample line state for bit0
andi x1, USBMASK ;--- --- [1] filter only D+ and D- bits
rjmp handleBit ;--- --- [2] make bit0 14 cycles long
;----------------------------------------------------------------------------
; Receiver loop (numbers in brackets are cycles within byte after instr)
;----------------------------------------------------------------------------
bitloop:
in x1, USBIN ;[0] sample line state
andi x1, USBMASK ;[1] filter only D+ and D- bits
breq se0 ;[2] both lines are low so handle se0
handleBit:
cpse x1, x2 ;[3] when previous line state equals current line state, handle "1"
rjmp handle0 ;[4] when line state differs, handle "0"
sec ;[5]
ror shift ;[6] shift "1" into the data
brcs b6checkUnstuff ;[7] When after shift C is set, next bit is bit7
nop2 ;[8]
dec bitcnt ;[10]
brne bitloop ;[11]
ldi x1,0 ;[12] indicate unstuff for bit other than bit6 or bit7
in bitcnt, USBIN ;[0] sample stuff bit
rjmp unstuff ;[1]
handle0:
mov x2, x1 ;[6] Set x2 to current line state
ldi bitcnt, 6 ;[7] reset unstuff counter.
lsr shift ;[8] shift "0" into the data
brcs bit7 ;[9] When after shift C is set, next bit is bit7
nop ;[10]
rjmp bitloop ;[11]
;----------------------------------------------------------------------------
; End of receive loop. Now start handling EOP
;----------------------------------------------------------------------------
macro POP_STANDARD ; 14 cycles
pop cnt
pop x4
pop x3
pop x2
pop x1
pop shift
pop bitcnt
endm
macro POP_RETI ; 7 cycles
pop YH
pop YL
out SREG, YL
pop YL
endm
#include "asmcommon.inc"
; USB spec says:
; idle = J
; J = (D+ = 0), (D- = 1)
; K = (D+ = 1), (D- = 0)
; Spec allows 7.5 bit times from EOP to SOP for replies
; 7.5 bit times is 100 cycles. This implementation arrives a bit later at se0
; then specified in the include file but there is plenty of time
bitstuffN:
eor x1, x4 ;[8]
ldi x2, 0 ;[9]
nop2 ;[10]
out USBOUT, x1 ;[12] <-- out
rjmp didStuffN ;[0]
bitstuff7:
eor x1, x4 ;[6]
ldi x2, 0 ;[7] Carry is zero due to brcc
rol shift ;[8] compensate for ror shift at branch destination
nop2 ;[9]
rjmp didStuff7 ;[11]
sendNakAndReti:
ldi x3, USBPID_NAK ;[-18]
rjmp sendX3AndReti ;[-17]
sendAckAndReti:
ldi cnt, USBPID_ACK ;[-17]
sendCntAndReti:
mov x3, cnt ;[-16]
sendX3AndReti:
ldi YL, 20 ;[-15] x3==r20 address is 20
ldi YH, 0 ;[-14]
ldi cnt, 2 ;[-13]
; rjmp usbSendAndReti fallthrough
;usbSend:
;pointer to data in 'Y'
;number of bytes in 'cnt' -- including sync byte [range 2 ... 12]
;uses: x1...x4, btcnt, shift, cnt, Y
;Numbers in brackets are time since first bit of sync pattern is sent
;We don't match the transfer rate exactly (don't insert leap cycles every third
;byte) because the spec demands only 1.5% precision anyway.
usbSendAndReti: ; 12 cycles until SOP
in x2, USBDDR ;[-12]
ori x2, USBMASK ;[-11]
sbi USBOUT, USBMINUS;[-10] prepare idle state; D+ and D- must have been 0 (no pullups)
in x1, USBOUT ;[-8] port mirror for tx loop
out USBDDR, x2 ;[-7] <- acquire bus
; need not init x2 (bitstuff history) because sync starts with 0
ldi x4, USBMASK ;[-6] exor mask
ldi shift, 0x80 ;[-5] sync byte is first byte sent
txByteLoop:
ldi bitcnt, 0x49 ;[-4] [10] binary 01001001
txBitLoop:
sbrs shift, 0 ;[-3] [10] [11]
eor x1, x4 ;[-2] [11] [12]
out USBOUT, x1 ;[-1] [12] [13] <-- out N
ror shift ;[0] [13] [14]
ror x2 ;[1]
didStuffN:
nop2 ;[2]
nop ;[4]
cpi x2, 0xfc ;[5]
brcc bitstuffN ;[6]
lsr bitcnt ;[7]
brcc txBitLoop ;[8]
brne txBitLoop ;[9]
sbrs shift, 0 ;[10]
eor x1, x4 ;[11]
didStuff7:
out USBOUT, x1 ;[-1] [13] <-- out 7
ror shift ;[0] [14]
ror x2 ;[1]
nop ;[2]
cpi x2, 0xfc ;[3]
brcc bitstuff7 ;[4]
ld shift, y+ ;[5]
dec cnt ;[7]
brne txByteLoop ;[8]
;make SE0:
cbr x1, USBMASK ;[9] prepare SE0 [spec says EOP may be 25 to 30 cycles]
lds x2, usbNewDeviceAddr;[10]
lsl x2 ;[12] we compare with left shifted address
out USBOUT, x1 ;[13] <-- out SE0 -- from now 2 bits = 22 cycles until bus idle
subi YL, 20 + 2 ;[0] Only assign address on data packets, not ACK/NAK in x3
sbci YH, 0 ;[1]
;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm:
;set address only after data packet was sent, not after handshake
breq skipAddrAssign ;[2]
sts usbDeviceAddr, x2; if not skipped: SE0 is one cycle longer
skipAddrAssign:
;end of usbDeviceAddress transfer
ldi x2, 1<<USB_INTR_PENDING_BIT;[4] int0 occurred during TX -- clear pending flag
USB_STORE_PENDING(x2) ;[5]
ori x1, USBIDLE ;[6]
in x2, USBDDR ;[7]
cbr x2, USBMASK ;[8] set both pins to input
mov x3, x1 ;[9]
cbr x3, USBMASK ;[10] configure no pullup on both pins
ldi x4, 5 ;[11]
se0Delay:
dec x4 ;[12] [15] [18] [21] [24]
brne se0Delay ;[13] [16] [19] [22] [25]
out USBOUT, x1 ;[26] <-- out J (idle) -- end of SE0 (EOP signal)
out USBDDR, x2 ;[27] <-- release bus now
out USBOUT, x3 ;[28] <-- ensure no pull-up resistors are active
rjmp doReturn

143
bootloader/usbdrv/usbportability.h Normal file
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@ -0,0 +1,143 @@
/* Name: usbportability.h
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
* Author: Christian Starkjohann
* Creation Date: 2008-06-17
* Tabsize: 4
* Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*/
/*
General Description:
This header is intended to contain all (or at least most of) the compiler
and library dependent stuff. The C code is written for avr-gcc and avr-libc.
The API of other development environments is converted to gcc's and avr-libc's
API by means of defines.
This header also contains all system includes since they depend on the
development environment.
Thanks to Oleg Semyonov for his help with the IAR tools port!
*/
#ifndef __usbportability_h_INCLUDED__
#define __usbportability_h_INCLUDED__
/* We check explicitly for IAR and CodeVision. Default is avr-gcc/avr-libc. */
/* ------------------------------------------------------------------------- */
#if defined __IAR_SYSTEMS_ICC__ || defined __IAR_SYSTEMS_ASM__ /* check for IAR */
/* ------------------------------------------------------------------------- */
#ifndef ENABLE_BIT_DEFINITIONS
# define ENABLE_BIT_DEFINITIONS 1 /* Enable bit definitions */
#endif
/* Include IAR headers */
#include <ioavr.h>
#ifndef __IAR_SYSTEMS_ASM__
# include <inavr.h>
#endif
#define __attribute__(arg) /* not supported on IAR */
#ifdef __IAR_SYSTEMS_ASM__
# define __ASSEMBLER__ /* IAR does not define standard macro for asm */
#endif
#ifdef __HAS_ELPM__
# define PROGMEM __farflash
#else
# define PROGMEM __flash
#endif
#define USB_READ_FLASH(addr) (*(PROGMEM char *)(addr))
/* The following definitions are not needed by the driver, but may be of some
* help if you port a gcc based project to IAR.
*/
#define cli() __disable_interrupt()
#define sei() __enable_interrupt()
#define wdt_reset() __watchdog_reset()
#define _BV(x) (1 << (x))
/* assembler compatibility macros */
#define nop2 rjmp $+2 /* jump to next instruction */
#define XL r26
#define XH r27
#define YL r28
#define YH r29
#define ZL r30
#define ZH r31
#define lo8(x) LOW(x)
#define hi8(x) (((x)>>8) & 0xff) /* not HIGH to allow XLINK to make a proper range check */
/* Depending on the device you use, you may get problems with the way usbdrv.h
* handles the differences between devices. Since IAR does not use #defines
* for MCU registers, we can't check for the existence of a particular
* register with an #ifdef. If the autodetection mechanism fails, include
* definitions for the required USB_INTR_* macros in your usbconfig.h. See
* usbconfig-prototype.h and usbdrv.h for details.
*/
/* ------------------------------------------------------------------------- */
#elif __CODEVISIONAVR__ /* check for CodeVision AVR */
/* ------------------------------------------------------------------------- */
/* This port is not working (yet) */
/* #define F_CPU _MCU_CLOCK_FREQUENCY_ seems to be defined automatically */
#include <io.h>
#include <delay.h>
#define __attribute__(arg) /* not supported on IAR */
#define PROGMEM __flash
#define USB_READ_FLASH(addr) (*(PROGMEM char *)(addr))
#ifndef __ASSEMBLER__
static inline void cli(void)
{
#asm("cli");
}
static inline void sei(void)
{
#asm("sei");
}
#endif
#define _delay_ms(t) delay_ms(t)
#define _BV(x) (1 << (x))
#define USB_CFG_USE_SWITCH_STATEMENT 1 /* macro for if() cascase fails for unknown reason */
#define macro .macro
#define endm .endmacro
#define nop2 rjmp .+0 /* jump to next instruction */
/* ------------------------------------------------------------------------- */
#else /* default development environment is avr-gcc/avr-libc */
/* ------------------------------------------------------------------------- */
#include <avr/io.h>
#ifdef __ASSEMBLER__
# define _VECTOR(N) __vector_ ## N /* io.h does not define this for asm */
#else
# include <avr/pgmspace.h>
#endif
#if USB_CFG_DRIVER_FLASH_PAGE
# define USB_READ_FLASH(addr) pgm_read_byte_far(((long)USB_CFG_DRIVER_FLASH_PAGE << 16) | (long)(addr))
#else
# define USB_READ_FLASH(addr) pgm_read_byte(addr)
#endif
#define macro .macro
#define endm .endm
#define nop2 rjmp .+0 /* jump to next instruction */
#endif /* development environment */
/* for conveniecne, ensure that PRG_RDB exists */
#ifndef PRG_RDB
# define PRG_RDB(addr) USB_READ_FLASH(addr)
#endif
#endif /* __usbportability_h_INCLUDED__ */