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(1:on, 0:off) */
  37 static uint16_t *matrix;
  38 static uint16_t *matrix_debouncing;
  39 static uint16_t matrix0[MATRIX_ROWS];
  40 static uint16_t matrix1[MATRIX_ROWS];
  41 static bool is_modified;
  42
  43 static uint16_t read_cols(void);
  44 static void init_cols(void);
  45 static void unselect_rows(void);
  46 static void select_row(uint8_t row);
  47
  48
  49 inline
  50 uint8_t matrix_rows(void)
  51 {
  52     return MATRIX_ROWS;
  53 }
  54
  55 inline
  56 uint8_t matrix_cols(void)
  57 {
  58     return MATRIX_COLS;
  59 }
  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     matrix = matrix0;
  69     matrix_debouncing = matrix1;
  70     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
  71         matrix[i] = 0;
  72         matrix_debouncing[i] = 0;
  73     }
  74     is_modified = false;
  75 }
  76
  77 uint8_t matrix_scan(void)
  78 {
  79     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  80         //unselect_rows();
  81         select_row(i);
  82         _delay_us(30);  // without this wait read unstable value.
  83         uint16_t cols = read_cols();
  84         if (matrix_debouncing[i] != cols) {
  85             matrix_debouncing[i] = cols;
  86             if (debouncing) {
  87                 debug("bounce!: "); debug_hex(debouncing); debug("\n");
  88             }
  89             debouncing = DEBOUNCE;
  90             is_modified = false;
  91         }
  92         unselect_rows();
  93     }
  94     //unselect_rows();
  95
  96     if (debouncing) {
  97         debouncing--;
  98         _delay_ms(1);
  99     } else {
 100         uint16_t *tmp = matrix;
 101         matrix = matrix_debouncing;
 102         matrix_debouncing = tmp;
 103         is_modified = true;
 104     }
 105
 106     return 1;
 107 }
 108
 109 bool matrix_is_modified(void)
 110 {
 111     return is_modified;
 112 }
 113
 114 inline
 115 bool matrix_has_ghost(void)
 116 {
 117     return false;
 118 }
 119
 120 inline
 121 bool matrix_is_on(uint8_t row, uint8_t col)
 122 {
 123     return (matrix[row] & (1<<col));
 124 }
 125
 126 inline
 127 uint16_t matrix_get_row(uint8_t row)
 128 {
 129     return matrix[row];
 130 }
 131
 132 void matrix_print(void)
 133 {
 134     print("\nr/c 01234567890ABCDEF\n");
 135     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 136         phex(row); print(": ");
 137         pbin_reverse16(matrix_get_row(row));
 138         print("\n");
 139     }
 140 }
 141
 142 uint8_t matrix_key_count(void)
 143 {
 144     uint8_t count = 0;
 145     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 146         count += bitpop16(matrix[i]);
 147     }
 148     return count;
 149 }
 150
 151 /* Column pin configuration
 152  * col: 0   1   2   3   4   5   6   7   8   9   10  11  12  13
 153  * pin: F0  F1  E6  C7  C6  B6  D4  B1  B0  B5  B4  D7  D6  B3
 154  */
 155 static void  init_cols(void)
 156 {
 157     // Input with pull-up(DDR:0, PORT:1)
 158     DDRF  &= ~(1<<0 | 1<<1);
 159     PORTF |=  (1<<0 | 1<<1);
 160     DDRE  &= ~(1<<6);
 161     PORTE |=  (1<<6);
 162     DDRD  &= ~(1<<7 | 1<<6 | 1<<4);
 163     PORTD |=  (1<<7 | 1<<6 | 1<<4);
 164     DDRC  &= ~(1<<7 | 1<<6);
 165     PORTC |=  (1<<7 | 1<<6);
 166     DDRB  &= ~(1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
 167     PORTB |=  (1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
 168 }
 169
 170 static uint16_t read_cols(void)
 171 {
 172     return (PINF&(1<<0) ? 0 : (1<<0)) |
 173            (PINF&(1<<1) ? 0 : (1<<1)) |
 174            (PINE&(1<<6) ? 0 : (1<<2)) |
 175            (PINC&(1<<7) ? 0 : (1<<3)) |
 176            (PINC&(1<<6) ? 0 : (1<<4)) |
 177            (PINB&(1<<6) ? 0 : (1<<5)) |
 178            (PIND&(1<<4) ? 0 : (1<<6)) |
 179            (PINB&(1<<1) ? 0 : (1<<7)) |
 180            (PINB&(1<<0) ? 0 : (1<<8)) |
 181            (PINB&(1<<5) ? 0 : (1<<9)) |
 182            (PINB&(1<<4) ? 0 : (1<<10)) |
 183            (PIND&(1<<7) ? 0 : (1<<11)) |
 184            (PIND&(1<<6) ? 0 : (1<<12)) |
 185            (PINB&(1<<3) ? 0 : (1<<13));
 186 }
 187
 188 /* Row pin configuration
 189  * row: 0   1   2   3   4
 190  * pin: D0  D1  D2  D3  D5
 191  */
 192 static void unselect_rows(void)
 193 {
 194     // Hi-Z(DDR:0, PORT:0) to unselect
 195     DDRD  &= ~0b00101111;
 196     PORTD &= ~0b00101111;
 197 }
 198
 199 static void select_row(uint8_t row)
 200 {
 201     // Output low(DDR:1, PORT:0) to select
 202     switch (row) {
 203         case 0:
 204             DDRD  |= (1<<0);
 205             PORTD &= ~(1<<0);
 206             break;
 207         case 1:
 208             DDRD  |= (1<<1);
 209             PORTD &= ~(1<<1);
 210             break;
 211         case 2:
 212             DDRD  |= (1<<2);
 213             PORTD &= ~(1<<2);
 214             break;
 215         case 3:
 216             DDRD  |= (1<<3);
 217             PORTD &= ~(1<<3);
 218             break;
 219         case 4:
 220             DDRD  |= (1<<5);
 221             PORTD &= ~(1<<5);
 222             break;
 223     }
 224 }