keyboard/stm32_f103_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 /* generic STM32F103C8T6 board */
  58 #ifdef BOARD_GENERIC_STM32_F103
  59 #define LED_ON()    do { palClearPad(GPIOC, GPIOC_LED) ;} while (0)
  60 #define LED_OFF()   do { palSetPad(GPIOC, GPIOC_LED); } while (0)
  61 #define LED_TGL()   do { palTogglePad(GPIOC, GPIOC_LED); } while (0)
  62 #endif
  63
  64 /* Maple Mini */
  65 #ifdef BOARD_MAPLEMINI_STM32_F103
  66 #define LED_ON()    do { palSetPad(GPIOB, 1) ;} while (0)
  67 #define LED_OFF()   do { palClearPad(GPIOB, 1); } while (0)
  68 #define LED_TGL()   do { palTogglePad(GPIOB, 1); } while (0)
  69 #endif
  70
  71 void matrix_init(void)
  72 {
  73     // initialize row and col
  74     unselect_rows();
  75     init_cols();
  76
  77     // initialize matrix state: all keys off
  78     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
  79         matrix[i] = 0;
  80         matrix_debouncing[i] = 0;
  81     }
  82
  83     //debug
  84     debug_matrix = true;
  85     LED_ON();
  86     wait_ms(500);
  87     LED_OFF();
  88 }
  89
  90 uint8_t matrix_scan(void)
  91 {
  92     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  93         select_row(i);
  94         wait_us(30);  // without this wait read unstable value.
  95         matrix_row_t cols = read_cols();
  96         if (matrix_debouncing[i] != cols) {
  97             matrix_debouncing[i] = cols;
  98             if (debouncing) {
  99                 debug("bounce!: "); debug_hex(debouncing); debug("\n");
 100             }
 101             debouncing = DEBOUNCE;
 102         }
 103         unselect_rows();
 104     }
 105
 106     if (debouncing) {
 107         if (--debouncing) {
 108             wait_ms(1);
 109         } else {
 110             for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 111                 matrix[i] = matrix_debouncing[i];
 112             }
 113         }
 114     }
 115
 116     return 1;
 117 }
 118
 119 inline
 120 bool matrix_is_on(uint8_t row, uint8_t col)
 121 {
 122     return (matrix[row] & ((matrix_row_t)1<<col));
 123 }
 124
 125 inline
 126 matrix_row_t matrix_get_row(uint8_t row)
 127 {
 128     return matrix[row];
 129 }
 130
 131 void matrix_print(void)
 132 {
 133     print("\nr/c 0123456789ABCDEF\n");
 134     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 135         phex(row); print(": ");
 136         pbin_reverse16(matrix_get_row(row));
 137         print("\n");
 138     }
 139 }
 140
 141 /* Column pin configuration
 142  */
 143 static void  init_cols(void)
 144 {
 145 #ifdef BOARD_MAPLEMINI_STM32_F103
 146     // don't need pullup/down, since it's pulled down in hardware
 147     palSetPadMode(GPIOB, 8, PAL_MODE_INPUT);
 148 #else
 149     palSetPadMode(GPIOB, 8, PAL_MODE_INPUT_PULLDOWN);
 150 #endif
 151 }
 152
 153 /* Returns status of switches(1:on, 0:off) */
 154 static matrix_row_t read_cols(void)
 155 {
 156     return ((palReadPad(GPIOB, 8)==PAL_LOW) ? 0 : (1<<0));
 157     // | ((palReadPad(...)==PAL_HIGH) ? 0 : (1<<1))
 158 }
 159
 160 /* Row pin configuration
 161  */
 162 static void unselect_rows(void)
 163 {
 164     // palSetPadMode(GPIOA, GPIOA_PIN10, PAL_MODE_INPUT); // hi-Z
 165 }
 166
 167 static void select_row(uint8_t row)
 168 {
 169     (void)row;
 170     // Output low to select
 171     // switch (row) {
 172     //     case 0:
 173     //         palSetPadMode(GPIOA, GPIOA_PIN10, PAL_MODE_OUTPUT_PUSHPULL);
 174     //         palSetPad(GPIOA, GPIOA_PIN10, PAL_LOW);
 175     //         break;
 176     // }
 177 }