keyboard/gh60/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 buffer(1:on, 0:off)
  37 static uint16_t *matrix;
  38 static uint16_t *matrix_prev;
  39 static uint16_t _matrix0[MATRIX_ROWS];
  40 static uint16_t _matrix1[MATRIX_ROWS];
  41
  42 static uint16_t read_cols(void);
  43 static void init_cols(void);
  44 static void unselect_rows(void);
  45 static void select_row(uint8_t row);
  46
  47
  48 inline
  49 uint8_t matrix_rows(void)
  50 {
  51     return MATRIX_ROWS;
  52 }
  53
  54 inline
  55 uint8_t matrix_cols(void)
  56 {
  57     return MATRIX_COLS;
  58 }
  59
  60 void matrix_init(void)
  61 {
  62     // initialize row and col
  63     unselect_rows();
  64     init_cols();
  65
  66     // initialize matrix state: all keys off
  67     for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0;
  68     for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0;
  69     matrix = _matrix0;
  70     matrix_prev = _matrix1;
  71 }
  72
  73 uint8_t matrix_scan(void)
  74 {
  75     if (!debouncing) {
  76         uint16_t *tmp = matrix_prev;
  77         matrix_prev = matrix;
  78         matrix = tmp;
  79     }
  80
  81     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  82         unselect_rows();
  83         select_row(i);
  84         _delay_us(1);  // without this wait read unstable value.
  85         uint16_t cols = ~read_cols();
  86         if (matrix[i] != cols) {
  87             matrix[i] = cols;
  88             if (debouncing) {
  89                 debug("bounce!: "); debug_hex(debouncing); print("\n");
  90             }
  91             debouncing = DEBOUNCE;
  92         }
  93     }
  94     unselect_rows();
  95
  96     if (debouncing) {
  97         debouncing--;
  98         _delay_ms(1); // improved affect on bouncing
  99     }
 100
 101     return 1;
 102 }
 103
 104 bool matrix_is_modified(void)
 105 {
 106     if (debouncing) return false;
 107     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 108         if (matrix[i] != matrix_prev[i]) {
 109             return true;
 110         }
 111     }
 112     return false;
 113 }
 114
 115 inline
 116 bool matrix_has_ghost(void)
 117 {
 118     return false;
 119 }
 120
 121 inline
 122 bool matrix_is_on(uint8_t row, uint8_t col)
 123 {
 124     return (matrix[row] & (1<<col));
 125 }
 126
 127 inline
 128 uint16_t matrix_get_row(uint8_t row)
 129 {
 130     return matrix[row];
 131 }
 132
 133 void matrix_print(void)
 134 {
 135     print("\nr/c 01234567\n");
 136     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 137         phex(row); print(": ");
 138         pbin_reverse16(matrix_get_row(row));
 139         print("\n");
 140     }
 141 }
 142
 143 uint8_t matrix_key_count(void)
 144 {
 145     uint8_t count = 0;
 146     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 147         count += bitpop16(matrix[i]);
 148     }
 149     return count;
 150 }
 151
 152 /* Column pin configuration
 153  * col: 0   1   2   3   4   5   6   7   8   9   10  11  12  13
 154  * pin: F0  F1  E6  C7  C6  B6  D4  B1  B0  B5  B4  D7  D6  B3
 155  */
 156 static void  init_cols(void)
 157 {
 158     // Input with pull-up(DDR:0, PORT:1)
 159     DDRF  &= ~(1<<0 | 1<<1);
 160     PORTF |=  (1<<0 | 1<<1);
 161     DDRE  &= ~(1<<6);
 162     PORTE |=  (1<<6);
 163     DDRD  &= ~(1<<7 | 1<<6 | 1<<4);
 164     PORTD |=  (1<<7 | 1<<6 | 1<<4);
 165     DDRC  &= ~(1<<7 | 1<<6);
 166     PORTC |=  (1<<7 | 1<<6);
 167     DDRB  &= ~(1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
 168     PORTB |=  (1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
 169 }
 170
 171 static uint16_t read_cols(void)
 172 {
 173     return (PINF&(1<<0) ? (1<<0)  : 0) |
 174            (PINF&(1<<1) ? (1<<1)  : 0) |
 175            (PINE&(1<<6) ? (1<<2)  : 0) |
 176            (PINC&(1<<7) ? (1<<3)  : 0) |
 177            (PINC&(1<<6) ? (1<<4)  : 0) |
 178            (PINB&(1<<6) ? (1<<5)  : 0) |
 179            (PIND&(1<<4) ? (1<<6)  : 0) |
 180            (PINB&(1<<1) ? (1<<7)  : 0) |
 181            (PINB&(1<<0) ? (1<<8)  : 0) |
 182            (PINB&(1<<5) ? (1<<9)  : 0) |
 183            (PINB&(1<<4) ? (1<<10) : 0) |
 184            (PIND&(1<<7) ? (1<<11) : 0) |
 185            (PIND&(1<<6) ? (1<<12) : 0) |
 186            (PINB&(1<<3) ? (1<<13) : 0);
 187 }
 188
 189 /* Row pin configuration
 190  * row: 0   1   2   3   4
 191  * pin: D0  D1  D2  D3  D5
 192  */
 193 static void unselect_rows(void)
 194 {
 195     // Hi-Z(DDR:0, PORT:0) to unselect
 196     DDRD  &= ~0b00101111;
 197     PORTD &= ~0b00101111;
 198 }
 199
 200 static void select_row(uint8_t row)
 201 {
 202     // Output low(DDR:1, PORT:0) to select
 203     switch (row) {
 204         case 0:
 205             DDRD  |= (1<<0);
 206             PORTD &= ~(1<<0);
 207             break;
 208         case 1:
 209             DDRD  |= (1<<1);
 210             PORTD &= ~(1<<1);
 211             break;
 212         case 2:
 213             DDRD  |= (1<<2);
 214             PORTD &= ~(1<<2);
 215             break;
 216         case 3:
 217             DDRD  |= (1<<3);
 218             PORTD &= ~(1<<3);
 219             break;
 220         case 4:
 221             DDRD  |= (1<<5);
 222             PORTD &= ~(1<<5);
 223             break;
 224     }
 225 }