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 matrix_row_t matrix[MATRIX_ROWS];
  38 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  39
  40 static matrix_row_t read_cols(void);
  41 static void init_cols(void);
  42 static void unselect_rows(void);
  43 static void select_row(uint8_t row);
  44
  45
  46 void matrix_init(void)
  47 {
  48     // initialize row and col
  49     unselect_rows();
  50     init_cols();
  51
  52     // initialize matrix state: all keys off
  53     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
  54         matrix[i] = 0;
  55         matrix_debouncing[i] = 0;
  56     }
  57 }
  58
  59 uint8_t matrix_scan(void)
  60 {
  61     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  62         select_row(i);
  63         _delay_us(30);  // without this wait read unstable value.
  64         matrix_row_t cols = read_cols();
  65         if (matrix_debouncing[i] != cols) {
  66             matrix_debouncing[i] = cols;
  67             if (debouncing) {
  68                 debug("bounce!: "); debug_hex(debouncing); debug("\n");
  69             }
  70             debouncing = DEBOUNCE;
  71         }
  72         unselect_rows();
  73     }
  74
  75     if (debouncing) {
  76         if (--debouncing) {
  77             _delay_ms(1);
  78         } else {
  79             for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  80                 matrix[i] = matrix_debouncing[i];
  81             }
  82         }
  83     }
  84
  85     return 1;
  86 }
  87
  88 inline
  89 matrix_row_t matrix_get_row(uint8_t row)
  90 {
  91     return matrix[row];
  92 }
  93
  94 /* Column pin configuration
  95  * col: 0   1   2   3   4   5   6   7   8   9   10  11  12  13
  96  * pin: F0  F1  E6  C7  C6  B6  D4  B1  B0  B5  B4  D7  D6  B3  (Rev.A)
  97  * pin:                                 B7                      (Rev.B)
  98  */
  99 static void  init_cols(void)
 100 {
 101     // Input with pull-up(DDR:0, PORT:1)
 102     DDRF  &= ~(1<<0 | 1<<1);
 103     PORTF |=  (1<<0 | 1<<1);
 104     DDRE  &= ~(1<<6);
 105     PORTE |=  (1<<6);
 106     DDRD  &= ~(1<<7 | 1<<6 | 1<<4);
 107     PORTD |=  (1<<7 | 1<<6 | 1<<4);
 108     DDRC  &= ~(1<<7 | 1<<6);
 109     PORTC |=  (1<<7 | 1<<6);
 110     DDRB  &= ~(1<<7 | 1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
 111     PORTB |=  (1<<7 | 1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
 112 }
 113
 114 static matrix_row_t read_cols(void)
 115 {
 116     return (PINF&(1<<0) ? 0 : (1<<0)) |
 117            (PINF&(1<<1) ? 0 : (1<<1)) |
 118            (PINE&(1<<6) ? 0 : (1<<2)) |
 119            (PINC&(1<<7) ? 0 : (1<<3)) |
 120            (PINC&(1<<6) ? 0 : (1<<4)) |
 121            (PINB&(1<<6) ? 0 : (1<<5)) |
 122            (PIND&(1<<4) ? 0 : (1<<6)) |
 123            (PINB&(1<<1) ? 0 : (1<<7)) |
 124            ((PINB&(1<<0) && PINB&(1<<7)) ? 0 : (1<<8)) |     // Rev.A and B
 125            (PINB&(1<<5) ? 0 : (1<<9)) |
 126            (PINB&(1<<4) ? 0 : (1<<10)) |
 127            (PIND&(1<<7) ? 0 : (1<<11)) |
 128            (PIND&(1<<6) ? 0 : (1<<12)) |
 129            (PINB&(1<<3) ? 0 : (1<<13));
 130 }
 131
 132 /* Row pin configuration
 133  * row: 0   1   2   3   4
 134  * pin: D0  D1  D2  D3  D5
 135  */
 136 static void unselect_rows(void)
 137 {
 138     // Hi-Z(DDR:0, PORT:0) to unselect
 139     DDRD  &= ~0b00101111;
 140     PORTD &= ~0b00101111;
 141 }
 142
 143 static void select_row(uint8_t row)
 144 {
 145     // Output low(DDR:1, PORT:0) to select
 146     switch (row) {
 147         case 0:
 148             DDRD  |= (1<<0);
 149             PORTD &= ~(1<<0);
 150             break;
 151         case 1:
 152             DDRD  |= (1<<1);
 153             PORTD &= ~(1<<1);
 154             break;
 155         case 2:
 156             DDRD  |= (1<<2);
 157             PORTD &= ~(1<<2);
 158             break;
 159         case 3:
 160             DDRD  |= (1<<3);
 161             PORTD &= ~(1<<3);
 162             break;
 163         case 4:
 164             DDRD  |= (1<<5);
 165             PORTD &= ~(1<<5);
 166             break;
 167     }
 168 }