keyboard/infinity_chibios/matrix.c

   1 #include <stdint.h>
   2 #include <stdbool.h>
   3 #include <string.h>
   4 #include "hal.h"
   5 #include "timer.h"
   6 #include "wait.h"
   7 #include "print.h"
   8 #include "matrix.h"
   9
  10
  11 /*
  12  * Infinity Pinusage:
  13  * Column pins are input with internal pull-down. Row pins are output and strobe with high.
  14  * Key is high or 1 when it turns on.
  15  *
  16  *     col: { PTD1, PTD2, PTD3, PTD4, PTD5, PTD6, PTD7 }
  17  *     row: { PTB0, PTB1, PTB2, PTB3, PTB16, PTB17, PTC4, PTC5, PTD0 }
  18  */
  19 /* matrix state(1:on, 0:off) */
  20 static matrix_row_t matrix[MATRIX_ROWS];
  21 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  22 static bool debouncing = false;
  23 static uint16_t debouncing_time = 0;
  24
  25
  26 void matrix_init(void)
  27 {
  28     /* Column(sense) */
  29     palSetPadMode(GPIOD, 1,  PAL_MODE_INPUT_PULLDOWN);
  30     palSetPadMode(GPIOD, 2,  PAL_MODE_INPUT_PULLDOWN);
  31     palSetPadMode(GPIOD, 3,  PAL_MODE_INPUT_PULLDOWN);
  32     palSetPadMode(GPIOD, 4,  PAL_MODE_INPUT_PULLDOWN);
  33     palSetPadMode(GPIOD, 5,  PAL_MODE_INPUT_PULLDOWN);
  34     palSetPadMode(GPIOD, 6,  PAL_MODE_INPUT_PULLDOWN);
  35     palSetPadMode(GPIOD, 7,  PAL_MODE_INPUT_PULLDOWN);
  36
  37     /* Row(strobe) */
  38     palSetPadMode(GPIOB, 0,  PAL_MODE_OUTPUT_PUSHPULL);
  39     palSetPadMode(GPIOB, 1,  PAL_MODE_OUTPUT_PUSHPULL);
  40     palSetPadMode(GPIOB, 2,  PAL_MODE_OUTPUT_PUSHPULL);
  41     palSetPadMode(GPIOB, 3,  PAL_MODE_OUTPUT_PUSHPULL);
  42     palSetPadMode(GPIOB, 16, PAL_MODE_OUTPUT_PUSHPULL);
  43     palSetPadMode(GPIOB, 17, PAL_MODE_OUTPUT_PUSHPULL);
  44     palSetPadMode(GPIOC, 4,  PAL_MODE_OUTPUT_PUSHPULL);
  45     palSetPadMode(GPIOC, 5,  PAL_MODE_OUTPUT_PUSHPULL);
  46     palSetPadMode(GPIOD, 0,  PAL_MODE_OUTPUT_PUSHPULL);
  47
  48     memset(matrix, 0, MATRIX_ROWS);
  49     memset(matrix_debouncing, 0, MATRIX_ROWS);
  50 }
  51
  52 uint8_t matrix_scan(void)
  53 {
  54     for (int row = 0; row < MATRIX_ROWS; row++) {
  55         matrix_row_t data = 0;
  56
  57         // strobe row
  58         switch (row) {
  59             case 0: palSetPad(GPIOB, 0);    break;
  60             case 1: palSetPad(GPIOB, 1);    break;
  61             case 2: palSetPad(GPIOB, 2);    break;
  62             case 3: palSetPad(GPIOB, 3);    break;
  63             case 4: palSetPad(GPIOB, 16);   break;
  64             case 5: palSetPad(GPIOB, 17);   break;
  65             case 6: palSetPad(GPIOC, 4);    break;
  66             case 7: palSetPad(GPIOC, 5);    break;
  67             case 8: palSetPad(GPIOD, 0);    break;
  68         }
  69
  70         wait_us(1); // need wait to settle pin state
  71
  72         // read col data
  73         data = (palReadPort(GPIOD)>>1);
  74
  75         // un-strobe row
  76         switch (row) {
  77             case 0: palClearPad(GPIOB, 0);    break;
  78             case 1: palClearPad(GPIOB, 1);    break;
  79             case 2: palClearPad(GPIOB, 2);    break;
  80             case 3: palClearPad(GPIOB, 3);    break;
  81             case 4: palClearPad(GPIOB, 16);   break;
  82             case 5: palClearPad(GPIOB, 17);   break;
  83             case 6: palClearPad(GPIOC, 4);    break;
  84             case 7: palClearPad(GPIOC, 5);    break;
  85             case 8: palClearPad(GPIOD, 0);    break;
  86         }
  87
  88         if (matrix_debouncing[row] != data) {
  89             matrix_debouncing[row] = data;
  90             debouncing = true;
  91             debouncing_time = timer_read();
  92         }
  93     }
  94
  95     if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
  96         for (int row = 0; row < MATRIX_ROWS; row++) {
  97             matrix[row] = matrix_debouncing[row];
  98         }
  99         debouncing = false;
 100     }
 101     return 1;
 102 }
 103
 104 bool matrix_is_on(uint8_t row, uint8_t col)
 105 {
 106     return (matrix[row] & (1<<col));
 107 }
 108
 109 matrix_row_t matrix_get_row(uint8_t row)
 110 {
 111     return matrix[row];
 112 }
 113
 114 void matrix_print(void)
 115 {
 116     xprintf("\nr/c 01234567\n");
 117     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 118         xprintf("%02X: ");
 119         matrix_row_t data = matrix_get_row(row);
 120         for (int col = 0; col < MATRIX_COLS; col++) {
 121             if (data & (1<<col))
 122                 xprintf("1");
 123             else
 124                 xprintf("0");
 125         }
 126         xprintf("\n");
 127     }
 128 }