keyboards/pegasushoof/matrix.c

   1 /*
   2 Copyright 2014 Ralf Schmitt <ralf@bunkertor.net>
   3 Copyright 2016 Daniel Svensson <dsvensson@gmail.com>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <stdint.h>
  20 #include <stdbool.h>
  21 #include <avr/io.h>
  22 #include <util/delay.h>
  23 #include "wait.h"
  24 #include "print.h"
  25 #include "debug.h"
  26 #include "util.h"
  27 #include "matrix.h"
  28
  29 static uint8_t debouncing = DEBOUNCING_DELAY;
  30 static matrix_row_t matrix[MATRIX_ROWS];
  31 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  32
  33 static matrix_row_t read_cols(void);
  34 static void select_row(uint8_t col);
  35
  36 inline uint8_t matrix_rows(void)
  37 {
  38         return MATRIX_ROWS;
  39 }
  40
  41 inline uint8_t matrix_cols(void)
  42 {
  43         return MATRIX_COLS;
  44 }
  45
  46 void matrix_init(void)
  47 {
  48         /* Column output pins */
  49         DDRD  |=  0b01111011;
  50         /* Row input pins */
  51         DDRC  &= ~0b10000000;
  52         DDRB  &= ~0b01111111;
  53         PORTC |=  0b10000000;
  54         PORTB |=  0b01111111;
  55
  56         for (uint8_t i=0; i < MATRIX_ROWS; i++)  {
  57                 matrix[i] = 0;
  58                 matrix_debouncing[i] = 0;
  59         }
  60
  61         matrix_init_quantum();
  62 }
  63
  64 uint8_t matrix_scan(void)
  65 {
  66         for (uint8_t col = 0; col < MATRIX_COLS; col++) {
  67                 select_row(col);
  68                 wait_us(30);
  69                 matrix_row_t rows = read_cols();
  70                 for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
  71                         bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
  72                         bool curr_bit = rows & (1<<row);
  73                         if (prev_bit != curr_bit) {
  74                                 matrix_debouncing[row] ^= (matrix_row_t) 1 << col;
  75                                 debouncing = DEBOUNCING_DELAY;
  76                         }
  77                 }
  78         }
  79
  80         if (debouncing) {
  81                 if (--debouncing) {
  82                         wait_ms(1);
  83                 } else {
  84                         for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  85                                 matrix[i] = matrix_debouncing[i];
  86                         }
  87                 }
  88         }
  89
  90         matrix_scan_quantum();
  91
  92         return 1;
  93 }
  94
  95 bool matrix_is_modified(void)
  96 {
  97         if (debouncing)
  98                 return false;
  99         return true;
 100 }
 101
 102 inline
 103 bool matrix_is_on(uint8_t row, uint8_t col)
 104 {
 105         return matrix[row] & 1 << col;
 106 }
 107
 108 inline
 109 matrix_row_t matrix_get_row(uint8_t row)
 110 {
 111         return matrix[row];
 112 }
 113
 114 void matrix_print(void)
 115 {
 116         print("\nr/c 0123456789ABCDEF\n");
 117         for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 118                 phex(row); print(": ");
 119                 pbin_reverse16(matrix_get_row(row));
 120                 print("\n");
 121         }
 122 }
 123
 124 uint8_t matrix_key_count(void)
 125 {
 126         uint8_t count = 0;
 127         for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 128                 count += bitpop16(matrix[i]);
 129         }
 130         return count;
 131 }
 132
 133 static matrix_row_t read_cols(void)
 134 {
 135         return
 136                 (PINB & (1 << 5) ? 0 : 1 << 0) |
 137                 (PINC & (1 << 7) ? 0 : 1 << 1) |
 138                 (PINB & (1 << 4) ? 0 : 1 << 2) |
 139                 (PINB & (1 << 6) ? 0 : 1 << 3) |
 140                 (PINB & (1 << 1) ? 0 : 1 << 4) |
 141                 (PINB & (1 << 0) ? 0 : 1 << 5) |
 142                 (PINB & (1 << 3) ? 0 : 1 << 6) |
 143                 (PINB & (1 << 2) ? 0 : 1 << 7);
 144 }
 145
 146 static void select_row(uint8_t col)
 147 {
 148         switch (col) {
 149                 case 0:
 150                         PORTD = (PORTD & ~0b01111011) | 0b00110011;
 151                         break;
 152                 case 1:
 153                         PORTD = (PORTD & ~0b01111011) | 0b01110000;
 154                         break;
 155                 case 2:
 156                         PORTD = (PORTD & ~0b01111011) | 0b00010011;
 157                         break;
 158                 case 3:
 159                         PORTD = (PORTD & ~0b01111011) | 0b01101000;
 160                         break;
 161                 case 4:
 162                         PORTD = (PORTD & ~0b01111011) | 0b00001011;
 163                         break;
 164                 case 5:
 165                         PORTD = (PORTD & ~0b01111011) | 0b00111011;
 166                         break;
 167                 case 6:
 168                         PORTD = (PORTD & ~0b01111011) | 0b01111000;
 169                         break;
 170                 case 7:
 171                         PORTD = (PORTD & ~0b01111011) | 0b01100001;
 172                         break;
 173                 case 8:
 174                         PORTD = (PORTD & ~0b01111011) | 0b01101001;
 175                         break;
 176                 case 9:
 177                         PORTD = (PORTD & ~0b01111011) | 0b01110001;
 178                         break;
 179                 case 10:
 180                         PORTD = (PORTD & ~0b01111011) | 0b01101010;
 181                         break;
 182                 case 11:
 183                         PORTD = (PORTD & ~0b01111011) | 0b01100010;
 184                         break;
 185                 case 12:
 186                         PORTD = (PORTD & ~0b01111011) | 0b01111001;
 187                         break;
 188                 case 13:
 189                         PORTD = (PORTD & ~0b01111011) | 0b01100000;
 190                         break;
 191                 case 14:
 192                         PORTD = (PORTD & ~0b01111011) | 0b01000011;
 193                         break;
 194                 case 15:
 195                         PORTD = (PORTD & ~0b01111011) | 0b00011011;
 196                         break;
 197                 case 16:
 198                         PORTD = (PORTD & ~0b01111011) | 0b00100011;
 199                         break;
 200                 case 17:
 201                         PORTD = (PORTD & ~0b01111011) | 0b00101011;
 202                         break;
 203         }
 204 }