keyboard/hid_liber/matrix.c

   1 /*
   2 Copyright 2011 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 #include <stdint.h>
  18 #include <stdbool.h>
  19 #include <avr/io.h>
  20 #include <util/delay.h>
  21 #include "print.h"
  22 #include "debug.h"
  23 #include "util.h"
  24 #include "matrix.h"
  25
  26
  27 #ifndef DEBOUNCE
  28 #   define DEBOUNCE     5
  29 #endif
  30 static uint8_t debouncing = DEBOUNCE;
  31
  32 // bit array of key state(1:on, 0:off)
  33 static matrix_row_t *matrix;
  34 static matrix_row_t *matrix_debounced;
  35 static matrix_row_t _matrix0[MATRIX_ROWS];
  36 static matrix_row_t _matrix1[MATRIX_ROWS];
  37
  38
  39 #define NROW 18
  40 #define NCOL 8
  41 #define _DDRA (uint8_t *const)&DDRA
  42 #define _DDRB (uint8_t *const)&DDRB
  43 #define _DDRC (uint8_t *const)&DDRC
  44 #define _DDRD (uint8_t *const)&DDRD
  45 #define _DDRE (uint8_t *const)&DDRE
  46 #define _DDRF (uint8_t *const)&DDRF
  47
  48 #define _PINA (uint8_t *const)&PINA
  49 #define _PINB (uint8_t *const)&PINB
  50 #define _PINC (uint8_t *const)&PINC
  51 #define _PIND (uint8_t *const)&PIND
  52 #define _PINE (uint8_t *const)&PINE
  53 #define _PINF (uint8_t *const)&PINF
  54
  55 #define _PORTA (uint8_t *const)&PORTA
  56 #define _PORTB (uint8_t *const)&PORTB
  57 #define _PORTC (uint8_t *const)&PORTC
  58 #define _PORTD (uint8_t *const)&PORTD
  59 #define _PORTE (uint8_t *const)&PORTE
  60 #define _PORTF (uint8_t *const)&PORTF
  61
  62 #define _BIT0 0x01
  63 #define _BIT1 0x02
  64 #define _BIT2 0x04
  65 #define _BIT3 0x08
  66 #define _BIT4 0x10
  67 #define _BIT5 0x20
  68 #define _BIT6 0x40
  69 #define _BIT7 0x80
  70
  71 /* Specifies the ports and pin numbers for the rows */
  72 static
  73 uint8_t *const  row_ddr[NROW] = {                                 _DDRB,                  _DDRB,
  74                                                                                   _DDRC,  _DDRC,
  75                                   _DDRD,  _DDRD,  _DDRD,  _DDRD,  _DDRD,  _DDRD,  _DDRD,  _DDRD,
  76                                   _DDRF,  _DDRF,                  _DDRF,  _DDRF,  _DDRF,  _DDRF};
  77
  78 static
  79 uint8_t *const row_port[NROW] = {                                _PORTB,                 _PORTB,
  80                                  _PORTC, _PORTC,
  81                                  _PORTD, _PORTD, _PORTD, _PORTD, _PORTD, _PORTD, _PORTD, _PORTD,
  82                                  _PORTF, _PORTF,                 _PORTF, _PORTF, _PORTF, _PORTF};
  83
  84 static
  85 uint8_t *const  row_pin[NROW] = {                                 _PINB,                  _PINB,
  86                                   _PINC,  _PINC,
  87                                   _PIND,  _PIND,  _PIND,  _PIND,  _PIND,  _PIND,  _PIND,  _PIND,
  88                                   _PINF,  _PINF,                  _PINF,  _PINF,  _PINF,  _PINF};
  89
  90 static
  91 const uint8_t   row_bit[NROW] = {                                 _BIT4,                  _BIT7,
  92                                                                                   _BIT6,  _BIT7,
  93                                   _BIT0,  _BIT1,  _BIT2,  _BIT3,  _BIT4,  _BIT5,  _BIT6,  _BIT7,
  94                                   _BIT0,  _BIT1,                  _BIT4,  _BIT5,  _BIT6,  _BIT7};
  95
  96 static
  97 const uint8_t mask = 0x0E;
  98
  99 /* Specifies the ports and pin numbers for the columns */
 100 static
 101 const uint8_t   col_bit[NCOL] = {  0x00,   0x02,   0x04,   0x06,   0x08,   0x0A,   0x0C,   0x0E};
 102
 103 static
 104 inline void pull_column(int col) {
 105   PORTB = col_bit[col] | (PORTB & ~mask);
 106 }
 107
 108 static
 109 inline void release_column(int col) {
 110 }
 111
 112 /* PORTB is set as input with pull-up resistors
 113    PORTC,D,E,F are set to high output */
 114 static
 115 void setup_io_pins(void) {
 116   uint8_t row;
 117   DDRB  |=  0x0E;
 118   PORTB &= ~0x0E;
 119   for(row = 0; row < NROW; row++) {
 120     *row_ddr[row]  &= ~row_bit[row];
 121     *row_port[row] &= ~row_bit[row];
 122   }
 123 }
 124
 125 static
 126 void setup_leds(void) {
 127   DDRB  |=  0x60;
 128   PORTB |=  0x60;
 129 }
 130
 131
 132 inline
 133 uint8_t matrix_rows(void)
 134 {
 135     return MATRIX_ROWS;
 136 }
 137
 138 inline
 139 uint8_t matrix_cols(void)
 140 {
 141     return MATRIX_COLS;
 142 }
 143
 144 void matrix_init(void)
 145 {
 146     // initialize row and col
 147     setup_io_pins();
 148     setup_leds();
 149
 150     // initialize matrix state: all keys off
 151     for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
 152     for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
 153     matrix = _matrix0;
 154     matrix_debounced = _matrix1;
 155 }
 156
 157 uint8_t matrix_scan(void)
 158 {
 159     if (!debouncing) {
 160         uint8_t *tmp = matrix_debounced;
 161         matrix_debounced = matrix;
 162         matrix = tmp;
 163     }
 164
 165     for (uint8_t col = 0; col < NCOL; col++) {  // 0-7
 166         pull_column(col);   // output hi on theline
 167         _delay_us(1);       // without this wait it won't read stable value.
 168         for (uint8_t row = 0; row < NROW; row++) {  // 0-17
 169             bool prev_bit = matrix[row] & (1<<col);
 170             bool curr_bit = *row_pin[row] & row_bit[row];
 171             if (prev_bit != curr_bit) {
 172                 matrix[row] ^= (1<<col);
 173                 if (debouncing) {
 174                     debug("bounce!: "); debug_hex(debouncing); print("\n");
 175                 }
 176                 debouncing = DEBOUNCE;
 177             }
 178         }
 179         release_column(col);
 180     }
 181
 182     if (debouncing) {
 183         debouncing--;
 184     }
 185
 186     return 1;
 187 }
 188
 189 bool matrix_is_modified(void)
 190 {
 191     // NOTE: no longer used
 192     return true;
 193 }
 194
 195 inline
 196 bool matrix_has_ghost(void)
 197 {
 198     return false;
 199 }
 200
 201 inline
 202 bool matrix_is_on(uint8_t row, uint8_t col)
 203 {
 204     return (matrix_debounced[row] & (1<<col));
 205 }
 206
 207 inline
 208 matrix_row_t matrix_get_row(uint8_t row)
 209 {
 210     return matrix_debounced[row];
 211 }
 212
 213 void matrix_print(void)
 214 {
 215     print("\nr/c 01234567\n");
 216     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 217         phex(row); print(": ");
 218         pbin_reverse(matrix_get_row(row));
 219         print("\n");
 220     }
 221 }
 222
 223 uint8_t matrix_key_count(void)
 224 {
 225     uint8_t count = 0;
 226     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 227         for (uint8_t j = 0; j < MATRIX_COLS; j++) {
 228             if (matrix_is_on(i, j))
 229                 count++;
 230         }
 231     }
 232     return count;
 233 }