keyboards/bpiphany/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 __attribute__ ((weak))
  37 void matrix_init_kb(void) {
  38     matrix_init_user();
  39 }
  40
  41 __attribute__ ((weak))
  42 void matrix_scan_kb(void) {
  43     matrix_scan_user();
  44 }
  45
  46 __attribute__ ((weak))
  47 void matrix_init_user(void) {
  48 }
  49
  50 __attribute__ ((weak))
  51 void matrix_scan_user(void) {
  52 }
  53
  54 inline uint8_t matrix_rows(void)
  55 {
  56         return MATRIX_ROWS;
  57 }
  58
  59 inline uint8_t matrix_cols(void)
  60 {
  61         return MATRIX_COLS;
  62 }
  63
  64 void matrix_init(void)
  65 {
  66         /* Column output pins */
  67         DDRD  |=  0b01111011;
  68         /* Row input pins */
  69         DDRC  &= ~0b10000000;
  70         DDRB  &= ~0b01111111;
  71         PORTC |=  0b10000000;
  72         PORTB |=  0b01111111;
  73
  74         for (uint8_t i=0; i < MATRIX_ROWS; i++)  {
  75                 matrix[i] = 0;
  76                 matrix_debouncing[i] = 0;
  77         }
  78
  79         matrix_init_quantum();
  80 }
  81
  82 uint8_t matrix_scan(void)
  83 {
  84         for (uint8_t col = 0; col < MATRIX_COLS; col++) {
  85                 select_row(col);
  86                 wait_us(30);
  87                 matrix_row_t rows = read_cols();
  88                 for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
  89                         bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
  90                         bool curr_bit = rows & (1<<row);
  91                         if (prev_bit != curr_bit) {
  92                                 matrix_debouncing[row] ^= (matrix_row_t) 1 << col;
  93                                 debouncing = DEBOUNCING_DELAY;
  94                         }
  95                 }
  96         }
  97
  98         if (debouncing) {
  99                 if (--debouncing) {
 100                         wait_ms(1);
 101                 } else {
 102                         for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 103                                 matrix[i] = matrix_debouncing[i];
 104                         }
 105                 }
 106         }
 107
 108         matrix_scan_quantum();
 109
 110         return 1;
 111 }
 112
 113 bool matrix_is_modified(void)
 114 {
 115         if (debouncing)
 116                 return false;
 117         return true;
 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 matrix_row_t matrix_get_row(uint8_t row)
 128 {
 129         return matrix[row];
 130 }
 131
 132 void matrix_print(void)
 133 {
 134         print("\nr/c 0123456789ABCDEF\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 static matrix_row_t read_cols(void)
 152 {
 153         return
 154                 (PINB & (1 << 5) ? 0 : 1 << 0) |
 155                 (PINC & (1 << 7) ? 0 : 1 << 1) |
 156                 (PINB & (1 << 4) ? 0 : 1 << 2) |
 157                 (PINB & (1 << 6) ? 0 : 1 << 3) |
 158                 (PINB & (1 << 1) ? 0 : 1 << 4) |
 159                 (PINB & (1 << 0) ? 0 : 1 << 5) |
 160                 (PINB & (1 << 3) ? 0 : 1 << 6) |
 161                 (PINB & (1 << 2) ? 0 : 1 << 7);
 162 }
 163
 164 static void select_row(uint8_t col)
 165 {
 166         switch (col) {
 167                 case 0:
 168                         PORTD = (PORTD & ~0b01111011) | 0b00110011;
 169                         break;
 170                 case 1:
 171                         PORTD = (PORTD & ~0b01111011) | 0b01110000;
 172                         break;
 173                 case 2:
 174                         PORTD = (PORTD & ~0b01111011) | 0b00010011;
 175                         break;
 176                 case 3:
 177                         PORTD = (PORTD & ~0b01111011) | 0b01101000;
 178                         break;
 179                 case 4:
 180                         PORTD = (PORTD & ~0b01111011) | 0b00001011;
 181                         break;
 182                 case 5:
 183                         PORTD = (PORTD & ~0b01111011) | 0b00111011;
 184                         break;
 185                 case 6:
 186                         PORTD = (PORTD & ~0b01111011) | 0b01111000;
 187                         break;
 188                 case 7:
 189                         PORTD = (PORTD & ~0b01111011) | 0b01100001;
 190                         break;
 191                 case 8:
 192                         PORTD = (PORTD & ~0b01111011) | 0b01101001;
 193                         break;
 194                 case 9:
 195                         PORTD = (PORTD & ~0b01111011) | 0b01110001;
 196                         break;
 197                 case 10:
 198                         PORTD = (PORTD & ~0b01111011) | 0b01101010;
 199                         break;
 200                 case 11:
 201                         PORTD = (PORTD & ~0b01111011) | 0b01100010;
 202                         break;
 203                 case 12:
 204                         PORTD = (PORTD & ~0b01111011) | 0b01111001;
 205                         break;
 206                 case 13:
 207                         PORTD = (PORTD & ~0b01111011) | 0b01100000;
 208                         break;
 209                 case 14:
 210                         PORTD = (PORTD & ~0b01111011) | 0b01000011;
 211                         break;
 212                 case 15:
 213                         PORTD = (PORTD & ~0b01111011) | 0b00011011;
 214                         break;
 215                 case 16:
 216                         PORTD = (PORTD & ~0b01111011) | 0b00100011;
 217                         break;
 218                 case 17:
 219                         PORTD = (PORTD & ~0b01111011) | 0b00101011;
 220                         break;
 221         }
 222 }