keyboard/bananasplit/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 matrix_row_t matrix[MATRIX_ROWS];
  38 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  39
  40 static matrix_row_t matrix_reversed[MATRIX_COLS];
  41 static matrix_row_t matrix_reversed_debouncing[MATRIX_COLS];
  42
  43 static matrix_row_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     // To use PORTF disable JTAG with writing JTD bit twice within four cycles.
  64     MCUCR |= (1<<JTD);
  65     MCUCR |= (1<<JTD);
  66
  67     // initialize row and col
  68     unselect_rows();
  69     init_cols();
  70
  71     // initialize matrix state: all keys off
  72     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
  73         matrix[i] = 0;
  74         matrix_debouncing[i] = 0;
  75     }
  76 }
  77
  78 uint8_t matrix_scan(void)
  79 {
  80     for (uint8_t i = 0; i < MATRIX_COLS; i++) {
  81         select_row(i);
  82         _delay_us(30);  // without this wait read unstable value.
  83         matrix_row_t rows = read_cols();
  84         if (matrix_reversed_debouncing[i] != rows) {
  85             matrix_reversed_debouncing[i] = rows;
  86             if (debouncing) {
  87                 debug("bounce!: "); debug_hex(debouncing); debug("\n");
  88             }
  89             debouncing = DEBOUNCE;
  90         }
  91         unselect_rows();
  92     }
  93
  94     if (debouncing) {
  95         if (--debouncing) {
  96             _delay_ms(1);
  97         } else {
  98             for (uint8_t i = 0; i < MATRIX_COLS; i++) {
  99                 matrix_reversed[i] = matrix_reversed_debouncing[i];
 100             }
 101         }
 102     }
 103
 104     for (uint8_t y = 0; y < MATRIX_ROWS; y++) {
 105         matrix_row_t row = 0;
 106         for (uint8_t x = 0; x < MATRIX_COLS; x++) {
 107             row |= ((matrix_reversed[x] & (1<<y)) >> y) << x;
 108         }
 109         matrix[y] = row;
 110     }
 111
 112     return 1;
 113 }
 114
 115 bool matrix_is_modified(void)
 116 {
 117     if (debouncing) return false;
 118     return true;
 119 }
 120
 121 inline
 122 bool matrix_is_on(uint8_t row, uint8_t col)
 123 {
 124     return (matrix[row] & ((matrix_row_t)1<<col));
 125 }
 126
 127 inline
 128 matrix_row_t matrix_get_row(uint8_t row)
 129 {
 130     return matrix[row];
 131 }
 132
 133 void matrix_print(void)
 134 {
 135     print("\nr/c 0123456789ABCDEF\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 /* Column pin configuration
 144  * col: 0   1   2   3   4   5   6   7   8   9   10  11  12  13
 145  * pin: F0  F1  E6  C7  C6  B6  D4  B1  B0  B5  B4  D7  D6  B3  (Rev.A)
 146  * pin:                                 B7                      (Rev.B)
 147  */
 148  static void  init_cols(void)
 149  {
 150      // Input with pull-up(DDR:0, PORT:1)
 151      DDRF  &= ~(1<<0 | 1<<1 | 1<<4 | 1<<5);
 152      PORTF |=  (1<<0 | 1<<1 | 1<<4 | 1<<5);
 153      DDRD  &= ~(1<<0 | 1<<1 | 1<<2 | 1<<3 | 1<<4 | 1<<5 | 1<<6 | 1<<7);
 154      PORTD |=  (1<<0 | 1<<1 | 1<<2 | 1<<3 | 1<<4 | 1<<5 | 1<<6 | 1<<7);
 155      DDRB  &= ~(1<<1 | 1<<3);
 156      PORTB |=  (1<<1 | 1<<3);
 157
 158  }
 159
 160  static matrix_row_t read_cols(void)
 161  {
 162      return (PINF&(1<<5) ? 0 : (1<<0)) |
 163             (PINB&(1<<1) ? 0 : (1<<1)) |
 164             (PINF&(1<<0) ? 0 : (1<<2)) |
 165             (PINF&(1<<1) ? 0 : (1<<3)) |
 166             (PINF&(1<<4) ? 0 : (1<<4)) |
 167             (PINB&(1<<3) ? 0 : (1<<5)) |
 168             (PIND&(1<<7) ? 0 : (1<<6)) |
 169             (PIND&(1<<6) ? 0 : (1<<7)) |
 170             (PIND&(1<<4) ? 0 : (1<<8)) |
 171             (PIND&(1<<5) ? 0 : (1<<9)) |
 172             (PIND&(1<<3) ? 0 : (1<<10)) |
 173             (PIND&(1<<2) ? 0 : (1<<11)) |
 174             (PIND&(1<<1) ? 0 : (1<<12)) |
 175             (PIND&(1<<0) ? 0 : (1<<13));
 176
 177  }
 178
 179 /* Row pin configuration
 180  * row: 0   1   2   3   4
 181  * pin: D0  D1  D2  D3  D5
 182  */
 183  static void unselect_rows(void)
 184  {
 185      // Hi-Z(DDR:0, PORT:0) to unselect
 186      DDRB  &= ~0b01110101;
 187      PORTB &= ~0b01110101;
 188
 189  }
 190
 191  static void select_row(uint8_t row)
 192  {
 193      // Output low(DDR:1, PORT:0) to select
 194      switch (row) {
 195          case 0:
 196              DDRB  |= (1<<0);
 197              PORTB &= ~(1<<0);
 198              break;
 199          case 1:
 200              DDRB  |= (1<<2);
 201              PORTB &= ~(1<<2);
 202              break;
 203          case 2:
 204              DDRB  |= (1<<4);
 205              PORTB &= ~(1<<4);
 206              break;
 207          case 3:
 208              DDRB  |= (1<<5);
 209              PORTB &= ~(1<<5);
 210              break;
 211          case 4:
 212              DDRB  |= (1<<6);
 213              PORTB &= ~(1<<6);
 214              break;
 215      }
 216  }