keyboard/hbkb/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 #include <stdint.h>
  19 #include <stdbool.h>
  20 #include <avr/io.h>
  21 #include <util/delay.h>
  22 #include "print.h"
  23 #include "debug.h"
  24 #include "util.h"
  25 #include "matrix.h"
  26
  27
  28 /*
  29  * Happy Buckling Keyboard(IBM Model M mod)
  30  *
  31  * Pin usage:
  32  *   COL: PD0-7
  33  *   ROW: PB0-7, PF4-7
  34  */
  35 #ifndef DEBOUNCE
  36 #   define DEBOUNCE     10
  37 #endif
  38 static uint8_t debouncing = DEBOUNCE;
  39
  40 // matrix state buffer(1:on, 0:off)
  41 static uint8_t *matrix;
  42 static uint8_t *matrix_debouncing;
  43 static uint8_t matrix0[MATRIX_ROWS];
  44 static uint8_t matrix1[MATRIX_ROWS];
  45
  46 #ifdef MATRIX_HAS_GHOST
  47 static bool matrix_has_ghost_in_row(uint8_t row);
  48 #endif
  49 static uint8_t read_col(void);
  50 static void unselect_rows(void);
  51 static void select_row(uint8_t row);
  52
  53
  54 inline
  55 uint8_t matrix_rows(void)
  56 {
  57     return MATRIX_ROWS;
  58 }
  59
  60 inline
  61 uint8_t matrix_cols(void)
  62 {
  63     return MATRIX_COLS;
  64 }
  65
  66 void matrix_init(void)
  67 {
  68     print_enable = true;
  69     debug_enable = true;
  70     debug_matrix = true;
  71     debug_keyboard = false;
  72     debug_mouse = false;
  73     print("debug enabled.\n");
  74
  75     // JTAG disable for PORT F. write JTD bit twice within four cycles.
  76     MCUCR |= (1<<JTD);
  77     MCUCR |= (1<<JTD);
  78
  79     // initialize rows
  80     unselect_rows();
  81
  82     // initialize columns to input with pull-up(DDR:0, PORT:1)
  83     DDRD = 0x00;
  84     PORTD = 0xFF;
  85
  86     // initialize matrix state: all keys off
  87     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix0[i] = 0x00;
  88     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix1[i] = 0x00;
  89     matrix = matrix0;
  90     matrix_debouncing = matrix1;
  91 }
  92
  93 uint8_t matrix_scan(void)
  94 {
  95     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  96         select_row(i);
  97         _delay_us(30);  // without this wait read unstable value.
  98         if (matrix_debouncing[i] != read_col()) {
  99             matrix_debouncing[i] = read_col();
 100             if (debouncing) {
 101                 debug("bounce!: "); debug_hex(debouncing); debug("\n");
 102             }
 103             debouncing = DEBOUNCE;
 104         }
 105         unselect_rows();
 106     }
 107
 108     if (debouncing) {
 109         if (--debouncing) {
 110             _delay_ms(1);
 111         } else {
 112             uint8_t *tmp = matrix;
 113             matrix = matrix_debouncing;
 114             matrix_debouncing = tmp;
 115         }
 116     }
 117
 118     return 1;
 119 }
 120
 121 bool matrix_is_modified(void)
 122 {
 123     if (debouncing) return false;
 124     return true;
 125 }
 126
 127 inline
 128 bool matrix_is_on(uint8_t row, uint8_t col)
 129 {
 130     return (matrix[row] & (1<<col));
 131 }
 132
 133 inline
 134 #if (MATRIX_COLS <= 8)
 135 uint8_t matrix_get_row(uint8_t row)
 136 #else
 137 uint16_t matrix_get_row(uint8_t row)
 138 #endif
 139 {
 140     return matrix[row];
 141 }
 142
 143 void matrix_print(void)
 144 {
 145     print("\nr/c 01234567\n");
 146     for (uint8_t row = 0; row < matrix_rows(); row++) {
 147         phex(row); print(": ");
 148 #if (MATRIX_COLS <= 8)
 149         pbin_reverse(matrix_get_row(row));
 150 #else
 151         pbin_reverse16(matrix_get_row(row));
 152 #endif
 153 #ifdef MATRIX_HAS_GHOST
 154         if (matrix_has_ghost_in_row(row)) {
 155             print(" <ghost");
 156         }
 157 #endif
 158         print("\n");
 159     }
 160 }
 161
 162 #ifdef MATRIX_HAS_GHOST
 163 inline
 164 static bool matrix_has_ghost_in_row(uint8_t row)
 165 {
 166     // no ghost exists in case less than 2 keys on
 167     if (((matrix[row] - 1) & matrix[row]) == 0)
 168         return false;
 169
 170     // ghost exists in case same state as other row
 171     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
 172         if (i != row && (matrix[i] & matrix[row]))
 173             return true;
 174     }
 175     return false;
 176 }
 177 #endif
 178
 179 inline
 180 static uint8_t read_col(void)
 181 {
 182     return ~PIND;
 183 }
 184
 185 inline
 186 static void unselect_rows(void)
 187 {
 188     // Hi-Z(DDR:0, PORT:0) to unselect
 189     DDRB  &= ~0b11111111;
 190     PORTB &= ~0b11111111;
 191     DDRF  &= ~0b11110000;
 192     PORTF &= ~0b11110000;
 193 }
 194
 195 inline
 196 static void select_row(uint8_t row)
 197 {
 198     // Output low(DDR:1, PORT:0) to select
 199     switch (row) {
 200         case 0:
 201         case 1:
 202         case 2:
 203         case 3:
 204         case 4:
 205         case 5:
 206         case 6:
 207         case 7:
 208             DDRB  |=  (1<<row);
 209             PORTB &= ~(1<<row);
 210             break;
 211         case 8:
 212             DDRF  |=  (1<<4);
 213             PORTF &= ~(1<<4);
 214             break;
 215         case 9:
 216         case 10:
 217         case 11:
 218             DDRF  |=  (1<<(row-4));
 219             PORTF &= ~(1<<(row-4));
 220             break;
 221     }
 222 }