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Author SHA1 Message Date
Markus Koch 8e25479ab5 Add rev 01 errata to README 2021-03-02 19:34:21 +01:00
Markus Koch 7b895a2561 Add jump-to-bootloader functionality 2021-03-02 19:27:50 +01:00
3 changed files with 42 additions and 1 deletions

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@ -1 +1,14 @@
# WS2812B light signal - CPU Board
Board to run [colorchord2](https://github.com/cnlohr/colorchord) on a string of WS2812B LEDs with live line-in audio.
## Errata (Rev 01)
* Opamp inverting / non-inverting inputs are swapped
* Workaround: Lift pads 2 and 3, and 5 and 6, and connect them crossed using magnet wire.
* Opamp is not rail-to-rail and does not allow to use the ADC in full range
* Workaround: Only use limited range -640 to 520.
* LED footprint is wrong.
* Workaround: Flip 180 degrees and solder shifted onto the right pads, then use magnet wire to connect the remaining two pads.
* Serial boot loader non-functional (uses incompatible UART I/Os).
* Workaround: Program via JTAG / SWD.

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@ -262,3 +262,29 @@ void ConfigureGPIO( uint8_t gpio, int parameters )
GPIO_Init(GPIOOf(gpio), &GPIO_InitStructure);
}
void JumpToBootloader(void) {
// Many thanks to https://stm32f4-discovery.net/2017/04/tutorial-jump-system-memory-software-stm32/
void (*SysMemBootJump)(void);
volatile uint32_t addr = 0x1FFF0000;
RCC_DeInit();
// Disable and reset systick
SysTick->CTRL = 0;
SysTick->LOAD = 0;
SysTick->VAL = 0;
__disable_irq();
// Remap system memory
SYSCFG->MEMRMP = 0x01;
SysMemBootJump = (void (*)(void)) (*((uint32_t *)(addr + 4)));
// Set main stack pointer
__set_MSP(*(uint32_t *)addr);
// Jump
SysMemBootJump();
}

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@ -54,8 +54,10 @@ void ConfigureGPIO( gpio gpio, int parameters );
#endif
void ConfigureUART();
void ConfigureLED();
void JumpToBootloader(void);
#define LED_TOGGLE {GPIOOf(LEDPIN)->ODR^=(1<<((LEDPIN)&0x0f));}
#define LED_ON GPIOOn(LEDPIN)
#define LED_OFF GPIOOff(LEDPIN)