keyboard/onekey/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 inline
  47 uint8_t matrix_rows(void)
  48 {
  49     return MATRIX_ROWS;
  50 }
  51
  52 inline
  53 uint8_t matrix_cols(void)
  54 {
  55     return MATRIX_COLS;
  56 }
  57
  58 void matrix_init(void)
  59 {
  60     debug_enable = true;
  61     debug_matrix = true;
  62     // initialize row and col
  63     unselect_rows();
  64     init_cols();
  65
  66     // initialize matrix state: all keys off
  67     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
  68         matrix[i] = 0;
  69         matrix_debouncing[i] = 0;
  70     }
  71 }
  72
  73 uint8_t matrix_scan(void)
  74 {
  75     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  76         select_row(i);
  77         _delay_us(30);  // without this wait read unstable value.
  78         matrix_row_t cols = read_cols();
  79         if (matrix_debouncing[i] != cols) {
  80             matrix_debouncing[i] = cols;
  81             if (debouncing) {
  82                 debug("bounce!: "); debug_hex(debouncing); debug("\n");
  83             }
  84             debouncing = DEBOUNCE;
  85         }
  86         unselect_rows();
  87     }
  88
  89     if (debouncing) {
  90         if (--debouncing) {
  91             _delay_ms(1);
  92         } else {
  93             for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  94                 matrix[i] = matrix_debouncing[i];
  95             }
  96         }
  97     }
  98
  99     return 1;
 100 }
 101
 102 bool matrix_is_modified(void)
 103 {
 104     if (debouncing) return false;
 105     return true;
 106 }
 107
 108 inline
 109 bool matrix_is_on(uint8_t row, uint8_t col)
 110 {
 111     return (matrix[row] & ((matrix_row_t)1<<col));
 112 }
 113
 114 inline
 115 matrix_row_t matrix_get_row(uint8_t row)
 116 {
 117     return matrix[row];
 118 }
 119
 120 void matrix_print(void)
 121 {
 122     print("\nr/c 0123456789ABCDEF\n");
 123     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 124         phex(row); print(": ");
 125         pbin_reverse16(matrix_get_row(row));
 126         print("\n");
 127     }
 128 }
 129
 130 uint8_t matrix_key_count(void)
 131 {
 132     uint8_t count = 0;
 133     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 134         count += bitpop16(matrix[i]);
 135     }
 136     return count;
 137 }
 138
 139 /* Column pin configuration
 140  * col: 0
 141  * pin: D0
 142  */
 143 static void  init_cols(void)
 144 {
 145     // Input with pull-up(DDR:0, PORT:1)
 146     DDRD  &= ~(1<<0);
 147     PORTD |=  (1<<0);
 148 }
 149
 150 static matrix_row_t read_cols(void)
 151 {
 152     return (PIND&(1<<0) ? 0 : (1<<0));
 153 }
 154
 155 /* Row pin configuration
 156  * row: 0
 157  * pin: D1
 158  */
 159 static void unselect_rows(void)
 160 {
 161     // Hi-Z(DDR:0, PORT:0) to unselect
 162     DDRD  &= ~0b00000010;
 163     PORTD &= ~0b00000010;
 164 }
 165
 166 static void select_row(uint8_t row)
 167 {
 168     // Output low(DDR:1, PORT:0) to select
 169     switch (row) {
 170         case 0:
 171             DDRD  |= (1<<1);
 172             PORTD &= ~(1<<1);
 173             break;
 174     }
 175 }