lw35-upgrade/keyboard/avr/main.c

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#include <avr/io.h>
#include <util/delay.h>
#define MATRIX_X(t) t##B
#define MATRIX_Y1(t) t##C
#define MATRIX_Y2(t) t##D
#define MATRIX_Y_SPLIT 6
#define MATRIX_Y2_DELTA (-1)
#define MASK_Y1 0b00111111
#define MASK_Y2 0b11100000
#define DELAY_ROW_SWITCH() _delay_ms(1) //_delay_us(1)
#define BAUDRATE 9600
#define UBRR 51 // (F_CPU / BAUDRATE) / 32
/* Keycode from include/linux/input.h */
#define KEY_RESERVED 0
#define KEY_ESC 1
#define KEY_1 2
#define KEY_2 3
#define KEY_3 4
#define KEY_4 5
#define KEY_5 6
#define KEY_6 7
#define KEY_7 8
#define KEY_8 9
#define KEY_9 10
#define KEY_0 11
#define KEY_MINUS 12
#define KEY_EQUAL 13
#define KEY_BACKSPACE 14
#define KEY_TAB 15
#define KEY_Q 16
#define KEY_W 17
#define KEY_E 18
#define KEY_R 19
#define KEY_T 20
#define KEY_Y 21
#define KEY_U 22
#define KEY_I 23
#define KEY_O 24
#define KEY_P 25
#define KEY_LEFTBRACE 26
#define KEY_RIGHTBRACE 27
#define KEY_ENTER 28
#define KEY_LEFTCTRL 29
#define KEY_A 30
#define KEY_S 31
#define KEY_D 32
#define KEY_F 33
#define KEY_G 34
#define KEY_H 35
#define KEY_J 36
#define KEY_K 37
#define KEY_L 38
#define KEY_SEMICOLON 39
#define KEY_APOSTROPHE 40
#define KEY_GRAVE 41
#define KEY_LEFTSHIFT 42
#define KEY_BACKSLASH 43
#define KEY_Z 44
#define KEY_X 45
#define KEY_C 46
#define KEY_V 47
#define KEY_B 48
#define KEY_N 49
#define KEY_M 50
#define KEY_COMMA 51
#define KEY_DOT 52
#define KEY_SLASH 53
#define KEY_RIGHTSHIFT 54
#define KEY_KPASTERISK 55
#define KEY_LEFTALT 56
#define KEY_SPACE 57
#define KEY_CAPSLOCK 58
#define KEY_F1 59
#define KEY_F2 60
#define KEY_F3 61
#define KEY_F4 62
#define KEY_F5 63
#define KEY_F6 64
#define KEY_F7 65
#define KEY_F8 66
#define KEY_F9 67
#define KEY_F10 68
#define KEY_NUMLOCK 69
#define KEY_SCROLLLOCK 70
#define KEY_KP7 71
#define KEY_KP8 72
#define KEY_KP9 73
#define KEY_KPMINUS 74
#define KEY_KP4 75
#define KEY_KP5 76
#define KEY_KP6 77
#define KEY_KPPLUS 78
#define KEY_KP1 79
#define KEY_KP2 80
#define KEY_KP3 81
#define KEY_KP0 82
#define KEY_KPDOT 83
#define KEY_ZENKAKUHANKAKU 85
#define KEY_102ND 86
#define KEY_F11 87
#define KEY_F12 88
#define KEY_RO 89
#define KEY_KATAKANA 90
#define KEY_HIRAGANA 91
#define KEY_HENKAN 92
#define KEY_KATAKANAHIRAGANA 93
#define KEY_MUHENKAN 94
#define KEY_KPJPCOMMA 95
#define KEY_KPENTER 96
#define KEY_RIGHTCTRL 97
#define KEY_KPSLASH 98
#define KEY_SYSRQ 99
#define KEY_RIGHTALT 100
#define KEY_LINEFEED 101
#define KEY_HOME 102
#define KEY_UP 103
#define KEY_PAGEUP 104
#define KEY_LEFT 105
#define KEY_RIGHT 106
#define KEY_END 107
#define KEY_DOWN 108
#define KEY_PAGEDOWN 109
#define KEY_INSERT 110
#define KEY_DELETE 111
#define KEY_MACRO 112
#define KEY_MUTE 113
#define KEY_VOLUMEDOWN 114
#define KEY_VOLUMEUP 115
#define KEY_POWER 116 /* SC System Power Down */
#define KEY_KPEQUAL 117
#define KEY_KPPLUSMINUS 118
#define KEY_PAUSE 119
#define KEY_SCALE 120 /* AL Compiz Scale (Expose) */
#define KEY_KPCOMMA 121
#define KEY_HANGEUL 122
#define KEY_HANGUEL KEY_HANGEUL
#define KEY_HANJA 123
#define KEY_YEN 124
#define KEY_LEFTMETA 125
#define KEY_RIGHTMETA 126
#define KEY_COMPOSE 127
#define SKEY_FN 255
#define KEYCODE_FN 127
static uint8_t keycode_translation_matrix[2][9][8] = {
{ /* Standard keymap */
{KEY_4, KEY_3, 3, 4, 5, 6, 7, 8},
{KEY_5, KEY_6, 13, 14, 15, 16, 17, 18},
{KEY_8, KEY_7, 23, 24, 25, 26, 27, 28},
{KEY_1, KEY_2, 33, 34, 35, 36, 37, 38},
{KEY_9, 42, 43, 44, 45, 46, 47, 48},
{51, KEY_0, 53, 54, 55, 56, 57, 58},
{61, 62, 63, 64, 65, 66, 67, 68},
{71, 72, 73, 74, 75, SKEY_FN, 77, 78},
{81, 82, 83, 84, 85, 86, 87, 88}
},
{ /* FN keymap */
{ 1, 2, 3, 4, 5, 6, 7, 8},
{11, 12, 13, 14, 15, 16, 17, 18},
{21, 22, 23, 24, 25, 26, 27, 28},
{31, 32, 33, 34, 35, 36, 37, 38},
{41, 42, 43, 44, 45, 46, 47, 48},
{51, 52, 53, 54, 55, 56, 57, 58},
{61, 62, 63, 64, 65, 66, 67, 68},
{71, 72, 73, 74, 75, SKEY_FN, 77, 78},
{81, 82, 83, 84, 85, 86, 87, 88}
}
};
uint8_t matrix_state_last_vector[9] = {0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF,
0xFF};
uint8_t fn_active = 0;
void process_key_event(uint8_t col, uint8_t row, uint8_t state)
{
char c;
uint8_t keycode;
keycode = keycode_translation_matrix[fn_active][col][row];
if (keycode == SKEY_FN) {
fn_active = state;
#ifdef KEYCODE_FN
while (!(UCSRA & (1 << UDRE)));
UDR = KEYCODE_FN | (state << 7);
#endif
} else {
c = keycode | (state << 7);
while (!(UCSRA & (1 << UDRE)));
UDR = c;
}
}
void matrix_scan_col(uint8_t col)
{
uint8_t matrix_state;
uint8_t row;
uint8_t bit;
if (col < MATRIX_Y_SPLIT) {
MATRIX_Y2(DDR) &= ~(MASK_Y2);
MATRIX_Y1(DDR) = (MATRIX_Y1(DDR) & ~(MASK_Y1)) |
(1 << col);
} else {
MATRIX_Y2(DDR) = (MATRIX_Y2(DDR) & ~(MASK_Y2)) |
(1 << (col + MATRIX_Y2_DELTA));
MATRIX_Y1(DDR) &= ~(MASK_Y1);
}
DELAY_ROW_SWITCH();
matrix_state = MATRIX_X(PIN);
for (row = 0; row < 8; ++row) {
bit = (1 << row);
if ((matrix_state ^ matrix_state_last_vector[col]) & bit) {
process_key_event(col, row, !(matrix_state & bit));
}
}
matrix_state_last_vector[col] = matrix_state;
}
int main()
{
int col;
/* Config I/O */
MATRIX_X(DDR) = 0; /* Columns as input */
MATRIX_X(PORT) = 0xFF; /* Enable pull-ups for columns */
MATRIX_Y1(DDR) &= ~MASK_Y1; /* Disable rows */
MATRIX_Y2(DDR) &= ~MASK_Y2; /* Disable rows */
MATRIX_Y1(PORT) &= ~MASK_Y1; /* Pull row low when selected */
MATRIX_Y2(PORT) &= ~MASK_Y2; /* Pull row low when selected */
UCSRB = (1 << TXEN);
UBRRH = (UBRR >> 8) & 0xFF;
UBRRL = UBRR & 0xFF;
fn_active = 0;
/* Continuously scan matrix */
while (1) {
for (col = 0; col < 9; ++col) {
matrix_scan_col(col);
}
}
}