keyboard/ghost_squid/matrix.c

   1 /*
   2 Copyright 2014 Ralf Schmitt <ralf@bunkertor.net>
   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 <stdint.h>
  19 #include <stdbool.h>
  20 #include <avr/io.h>
  21 #include <util/delay.h>
  22 #include "print.h"
  23 #include "debug.h"
  24 #include "util.h"
  25 #include "matrix.h"
  26
  27 #ifndef DEBOUNCE
  28 #   define DEBOUNCE 0
  29 #endif
  30 static uint8_t debouncing = DEBOUNCE;
  31
  32 static matrix_row_t matrix[MATRIX_ROWS];
  33 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  34
  35 static uint8_t read_rows(void);
  36 static void init_rows(void);
  37 static void unselect_cols(void);
  38 static void select_col(uint8_t col);
  39
  40 inline uint8_t matrix_rows(void)
  41 {
  42     return MATRIX_ROWS;
  43 }
  44
  45 inline uint8_t matrix_cols(void)
  46 {
  47     return MATRIX_COLS;
  48 }
  49
  50 void matrix_init(void)
  51 {
  52     unselect_cols();
  53     init_rows();
  54     for (uint8_t i=0; i < MATRIX_ROWS; i++)  {
  55         matrix[i] = 0;
  56         matrix_debouncing[i] = 0;
  57     }
  58 }
  59
  60 uint8_t matrix_scan(void)
  61 {
  62     for (uint8_t col = 0; col < MATRIX_COLS; col++) {
  63         select_col(col);
  64         _delay_us(3);
  65         uint8_t rows = read_rows();
  66         for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
  67             bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
  68             bool curr_bit = rows & (1<<row);
  69             if (prev_bit != curr_bit) {
  70                 matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
  71                 debouncing = DEBOUNCE;
  72             }
  73         }
  74         unselect_cols();
  75     }
  76
  77     if (debouncing) {
  78         if (--debouncing) {
  79             _delay_ms(1);
  80         } else {
  81             for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  82                 matrix[i] = matrix_debouncing[i];
  83             }
  84         }
  85     }
  86
  87     return 1;
  88 }
  89
  90 bool matrix_is_modified(void)
  91 {
  92     if (debouncing) return false;
  93     return true;
  94 }
  95
  96 inline bool matrix_is_on(uint8_t row, uint8_t col)
  97 {
  98     return (matrix[row] & ((matrix_row_t)1<<col));
  99 }
 100
 101 inline matrix_row_t matrix_get_row(uint8_t row)
 102 {
 103     return matrix[row];
 104 }
 105
 106 void matrix_print(void)
 107 {
 108     print("\nr/c 0123456789ABCDEF\n");
 109     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 110         xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row)));
 111     }
 112 }
 113
 114 uint8_t matrix_key_count(void)
 115 {
 116     uint8_t count = 0;
 117     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 118         count += bitpop32(matrix[i]);
 119     }
 120     return count;
 121 }
 122
 123 /* Row pin configuration
 124  *
 125  * row: 0    1    2    3    4    5    6    7
 126  * pin: PB1  PC2  PB6  PB4  PB3  PB5  PB0  PB2
 127  *
 128  */
 129 static void init_rows(void)
 130 {
 131     DDRC &= ~0b00000100;
 132     DDRB &= ~0b01111111;
 133     PORTC |= 0b00000100;
 134     PORTB |= 0b01111111;
 135 }
 136
 137 static uint8_t read_rows(void)
 138 {
 139     return (PINB&(1<<1) ? 0 : (1<<0)) |
 140            (PINC&(1<<2) ? 0 : (1<<1)) |
 141            (PINB&(1<<6) ? 0 : (1<<2)) |
 142            (PINB&(1<<4) ? 0 : (1<<3)) |
 143            (PINB&(1<<3) ? 0 : (1<<4)) |
 144            (PINB&(1<<5) ? 0 : (1<<5)) |
 145            (PINB&(1<<0) ? 0 : (1<<6)) |
 146            (PINB&(1<<2) ? 0 : (1<<7));
 147 }
 148
 149 /*  These columns uses two 74HC42 4 to 10 bit demultiplexers (low active).
 150  *
 151  *   COL PD6 PD5 PD4 PD3 PD2 PD1
 152  *   10   1   1   0   0   0   0
 153  *   15   1   1   0   0   0   1
 154  *    8   1   1   0   0   1   0
 155  *   14   1   1   0   1   0   0
 156  *    6   1   1   0   1   0   1
 157  *   13   1   1   0   1   1   0
 158  *   12   1   1   1   0   0   0
 159  *    9   1   1   1   0   1   0
 160  *   11   1   1   1   1   0   0
 161  *    7   1   1   1   1   1   0
 162  *
 163  *   COL PD1 PD2 PD3 PD4 PD5 PD6
 164  *    3   1   1   0   0   0   1
 165  *    4   1   1   0   0   1   0
 166  *   17   1   1   0   1   0   0
 167  *   16   1   1   0   1   1   0
 168  *    0   1   1   1   0   0   1
 169  *    5   1   1   1   0   1   0
 170  *    2   1   1   1   1   0   0
 171  *    1   1   1   1   1   1   0
 172  */
 173 static void unselect_cols(void)
 174 {
 175     DDRD |= 0b01111111;
 176     PORTD &= ~0b01111111;
 177 }
 178
 179 static void select_col(uint8_t col)
 180 {
 181     switch (col) {
 182         case 0:
 183             PORTD |= (1<<6) | (1<<3) | (1<<2) | (1<<1);
 184             break;
 185         case 1:
 186             PORTD |= (1<<5) | (1<<4) | (1<<3) | (1<<2) | (1<<1);
 187             break;
 188         case 2:
 189             PORTD |= (1<<4) | (1<<3) | (1<<2) | (1<<1);
 190             break;
 191         case 3:
 192             PORTD |= (1<<6) | (1<<2) | (1<<1);
 193             break;
 194         case 4:
 195             PORTD |= (1<<5) | (1<<2) | (1<<1);
 196             break;
 197         case 5:
 198             PORTD |= (1<<5) | (1<<3) | (1<<2) | (1<<1);
 199             break;
 200         case 6:
 201             PORTD |= (1<<6) | (1<<5) | (1<<3) | (1<<1);
 202             break;
 203         case 7:
 204             PORTD |= (1<<6) | (1<<5) | (1<<4) | (1<<3) | (1<<2);
 205             break;
 206         case 8:
 207             PORTD |= (1<<6) | (1<<5) | (1<<2);
 208             break;
 209         case 9:
 210             PORTD |= (1<<6) | (1<<5) | (1<<4) | (1<<2);
 211             break;
 212         case 10:
 213             PORTD |= (1<<6) | (1<<5);
 214             break;
 215         case 11:
 216             PORTD |= (1<<6) | (1<<5) | (1<<4) | (1<<3);
 217             break;
 218         case 12:
 219             PORTD |= (1<<6) | (1<<5) | (1<<4);
 220             break;
 221         case 13:
 222             PORTD |= (1<<6) | (1<<5) | (1<<3) | (1<<2);
 223             break;
 224         case 14:
 225             PORTD |= (1<<6) | (1<<5) | (1<<3);
 226             break;
 227         case 15:
 228             PORTD |= (1<<6) | (1<<5) | (1<<1);
 229             break;
 230         case 16:
 231             PORTD |= (1<<5) | (1<<4) | (1<<2) | (1<<1);
 232             break;
 233         case 17:
 234             PORTD |= (1<<4) | (1<<2) | (1<<1);
 235             break;
 236     }
 237 }