keyboard/stm32_f072_onekey/matrix.c

   1 /*
   2 Copyright 2012 Jun Wako <wakojun@gmail.com>
   3
   4 This program is free software: you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation, either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 #include "ch.h"
  19 #include "hal.h"
  20
  21 /*
  22  * scan matrix
  23  */
  24 #include "print.h"
  25 #include "debug.h"
  26 #include "util.h"
  27 #include "matrix.h"
  28 #include "wait.h"
  29
  30 #ifndef DEBOUNCE
  31 #   define DEBOUNCE 5
  32 #endif
  33 static uint8_t debouncing = DEBOUNCE;
  34
  35 /* matrix state(1:on, 0:off) */
  36 static matrix_row_t matrix[MATRIX_ROWS];
  37 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  38
  39 static matrix_row_t read_cols(void);
  40 static void init_cols(void);
  41 static void unselect_rows(void);
  42 static void select_row(uint8_t row);
  43
  44
  45 inline
  46 uint8_t matrix_rows(void)
  47 {
  48     return MATRIX_ROWS;
  49 }
  50
  51 inline
  52 uint8_t matrix_cols(void)
  53 {
  54     return MATRIX_COLS;
  55 }
  56
  57 #define LED_ON()    do { palSetPad(GPIOC, GPIOC_LED_BLUE) ;} while (0)
  58 #define LED_OFF()   do { palClearPad(GPIOC, GPIOC_LED_BLUE); } while (0)
  59 #define LED_TGL()   do { palTogglePad(GPIOC, GPIOC_LED_BLUE); } while (0)
  60
  61 void matrix_init(void)
  62 {
  63     // initialize row and col
  64     unselect_rows();
  65     init_cols();
  66
  67     // initialize matrix state: all keys off
  68     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
  69         matrix[i] = 0;
  70         matrix_debouncing[i] = 0;
  71     }
  72
  73     //debug
  74     debug_matrix = true;
  75     LED_ON();
  76     wait_ms(500);
  77     LED_OFF();
  78 }
  79
  80 uint8_t matrix_scan(void)
  81 {
  82     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  83         select_row(i);
  84         wait_us(30);  // without this wait read unstable value.
  85         matrix_row_t cols = read_cols();
  86         if (matrix_debouncing[i] != cols) {
  87             matrix_debouncing[i] = cols;
  88             if (debouncing) {
  89                 debug("bounce!: "); debug_hex(debouncing); debug("\n");
  90             }
  91             debouncing = DEBOUNCE;
  92         }
  93         unselect_rows();
  94     }
  95
  96     if (debouncing) {
  97         if (--debouncing) {
  98             wait_ms(1);
  99         } else {
 100             for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 101                 matrix[i] = matrix_debouncing[i];
 102             }
 103         }
 104     }
 105
 106     return 1;
 107 }
 108
 109 inline
 110 bool matrix_is_on(uint8_t row, uint8_t col)
 111 {
 112     return (matrix[row] & ((matrix_row_t)1<<col));
 113 }
 114
 115 inline
 116 matrix_row_t matrix_get_row(uint8_t row)
 117 {
 118     return matrix[row];
 119 }
 120
 121 void matrix_print(void)
 122 {
 123     print("\nr/c 0123456789ABCDEF\n");
 124     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 125         phex(row); print(": ");
 126         pbin_reverse16(matrix_get_row(row));
 127         print("\n");
 128     }
 129 }
 130
 131 /* Column pin configuration
 132  */
 133 static void  init_cols(void)
 134 {
 135     // don't need pullup/down, since it's pulled down in hardware
 136     palSetPadMode(GPIOA, GPIOA_BUTTON, PAL_MODE_INPUT);
 137 }
 138
 139 /* Returns status of switches(1:on, 0:off) */
 140 static matrix_row_t read_cols(void)
 141 {
 142     return ((palReadPad(GPIOA, GPIOA_BUTTON)==PAL_LOW) ? 0 : (1<<0));
 143     // | ((palReadPad(...)==PAL_HIGH) ? 0 : (1<<1))
 144 }
 145
 146 /* Row pin configuration
 147  */
 148 static void unselect_rows(void)
 149 {
 150     // palSetPadMode(GPIOA, GPIOA_PIN10, PAL_MODE_INPUT); // hi-Z
 151 }
 152
 153 static void select_row(uint8_t row)
 154 {
 155     (void)row;
 156     // Output low to select
 157     // switch (row) {
 158     //     case 0:
 159     //         palSetPadMode(GPIOA, GPIOA_PIN10, PAL_MODE_OUTPUT_PUSHPULL);
 160     //         palSetPad(GPIOA, GPIOA_PIN10, PAL_LOW);
 161     //         break;
 162     // }
 163 }