keyboard/infinity/matrix.c

   1 #include <stdint.h>
   2 #include <stdbool.h>
   3 #include "gpio_api.h"
   4 #include "timer.h"
   5 #include "wait.h"
   6 #include "matrix.h"
   7
   8
   9 #ifndef DEBOUNCE
  10 #define DEBOUNCE    5
  11 #endif
  12
  13 /*
  14  * Infinity Pinusage:
  15  * Column pins are input with internal pull-down. Row pins are output and strobe with high.
  16  * Key is high or 1 when it turns on.
  17  *
  18  *     col: { PTD1, PTD2, PTD3, PTD4, PTD5, PTD6, PTD7 }
  19  *     row: { PTB0, PTB1, PTB2, PTB3, PTB16, PTB17, PTC4, PTC5, PTD0 }
  20  */
  21 static gpio_t col[MATRIX_COLS];
  22 static gpio_t row[MATRIX_ROWS];
  23
  24 /* matrix state(1:on, 0:off) */
  25 static matrix_row_t matrix[MATRIX_ROWS];
  26 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  27 static bool debouncing = false;
  28 static uint16_t debouncing_time = 0;
  29
  30
  31 void matrix_init(void)
  32 {
  33     /* Column(sense) */
  34     gpio_init_in_ex(&col[0], PTD1, PullDown);
  35     gpio_init_in_ex(&col[1], PTD2, PullDown);
  36     gpio_init_in_ex(&col[2], PTD3, PullDown);
  37     gpio_init_in_ex(&col[3], PTD4, PullDown);
  38     gpio_init_in_ex(&col[4], PTD5, PullDown);
  39     gpio_init_in_ex(&col[5], PTD6, PullDown);
  40     gpio_init_in_ex(&col[6], PTD7, PullDown);
  41
  42     /* Row(strobe) */
  43     gpio_init_out_ex(&row[0], PTB0, 0);
  44     gpio_init_out_ex(&row[1], PTB1, 0);
  45     gpio_init_out_ex(&row[2], PTB2, 0);
  46     gpio_init_out_ex(&row[3], PTB3, 0);
  47     gpio_init_out_ex(&row[4], PTB16, 0);
  48     gpio_init_out_ex(&row[5], PTB17, 0);
  49     gpio_init_out_ex(&row[6], PTC4, 0);
  50     gpio_init_out_ex(&row[7], PTC5, 0);
  51     gpio_init_out_ex(&row[8], PTD0, 0);
  52 }
  53
  54 uint8_t matrix_scan(void)
  55 {
  56     for (int i = 0; i < MATRIX_ROWS; i++) {
  57         matrix_row_t r = 0;
  58
  59         gpio_write(&row[i], 1);
  60         wait_us(1); // need wait to settle pin state
  61         for (int j = 0; j < MATRIX_COLS; j++) {
  62             if (gpio_read(&col[j])) {
  63                 r |= (1<<j);
  64             }
  65         }
  66         gpio_write(&row[i], 0);
  67
  68         if (matrix_debouncing[i] != r) {
  69             matrix_debouncing[i] = r;
  70             debouncing = true;
  71             debouncing_time = timer_read();
  72         }
  73     }
  74
  75     if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
  76         for (int i = 0; i < MATRIX_ROWS; i++) {
  77             matrix[i] = matrix_debouncing[i];
  78         }
  79         debouncing = false;
  80     }
  81 /*
  82     if (debouncing) {
  83         if (--debouncing) {
  84             return 0;
  85         } else {
  86             for (int i = 0; i < MATRIX_ROWS; i++) {
  87                 matrix[i] = matrix_debouncing[i];
  88             }
  89         }
  90     }
  91 */
  92     return 1;
  93 }
  94
  95 bool matrix_is_on(uint8_t row, uint8_t col)
  96 {
  97     return (matrix[row] & (1<<col));
  98 }
  99
 100 matrix_row_t matrix_get_row(uint8_t row)
 101 {
 102     return matrix[row];
 103 }
 104
 105 void matrix_print(void)
 106 {
 107 }