keyboard/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 /*
  19  * scan matrix
  20  */
  21 #include <stdint.h>
  22 #include <stdbool.h>
  23 #include <avr/io.h>
  24 #include <util/delay.h>
  25 #include "print.h"
  26 #include "debug.h"
  27 #include "util.h"
  28 #include "matrix.h"
  29
  30
  31 #ifndef DEBOUNCE
  32 #   define DEBOUNCE     5
  33 #endif
  34 static uint8_t debouncing = DEBOUNCE;
  35
  36 /* matrix state(1:on, 0:off) */
  37 static matrix_row_t matrix[MATRIX_ROWS];
  38 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  39
  40 static matrix_row_t read_cols(void);
  41 static void init_cols(void);
  42 static void unselect_rows(void);
  43 static void select_row(uint8_t row);
  44
  45
  46 inline
  47 uint8_t matrix_rows(void)
  48 {
  49     return MATRIX_ROWS;
  50 }
  51
  52 inline
  53 uint8_t matrix_cols(void)
  54 {
  55     return MATRIX_COLS;
  56 }
  57
  58 void matrix_init(void)
  59 {
  60     debug_enable = true;
  61     debug_matrix = true;
  62     debug_mouse = true;
  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
  74 uint8_t matrix_scan(void)
  75 {
  76     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  77         select_row(i);
  78         _delay_us(30);  // without this wait read unstable value.
  79         matrix_row_t cols = read_cols();
  80         if (matrix_debouncing[i] != cols) {
  81             matrix_debouncing[i] = cols;
  82             if (debouncing) {
  83                 debug("bounce!: "); debug_hex(debouncing); debug("\n");
  84             }
  85             debouncing = DEBOUNCE;
  86         }
  87         unselect_rows();
  88     }
  89
  90     if (debouncing) {
  91         if (--debouncing) {
  92             _delay_ms(1);
  93         } else {
  94             for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  95                 matrix[i] = matrix_debouncing[i];
  96             }
  97         }
  98     }
  99
 100     return 1;
 101 }
 102
 103 bool matrix_is_modified(void)
 104 {
 105     if (debouncing) return false;
 106     return true;
 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 uint8_t matrix_key_count(void)
 132 {
 133     uint8_t count = 0;
 134     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 135         count += bitpop16(matrix[i]);
 136     }
 137     return count;
 138 }
 139
 140 /* Column pin configuration
 141  * col: 0
 142  * pin: B0
 143  */
 144 static void  init_cols(void)
 145 {
 146     // Input with pull-up(DDR:0, PORT:1)
 147     DDRB  &= ~(1<<0);
 148     PORTB |=  (1<<0);
 149 }
 150
 151 static matrix_row_t read_cols(void)
 152 {
 153     return (PINB&(1<<0) ? 0 : (1<<0));
 154 }
 155
 156 /* Row pin configuration
 157  * row: 0
 158  * pin: B1
 159  */
 160 static void unselect_rows(void)
 161 {
 162     // Hi-Z(DDR:0, PORT:0) to unselect
 163     DDRB  &= ~0b00000010;
 164     PORTB &= ~0b00000010;
 165 }
 166
 167 static void select_row(uint8_t row)
 168 {
 169     // Output low(DDR:1, PORT:0) to select
 170     switch (row) {
 171         case 0:
 172             DDRB  |= (1<<1);
 173             PORTB &= ~(1<<1);
 174             break;
 175     }
 176 }