keyboard/lightsaber/matrix.c

   1 /*
   2 Copyright 2014 Ralf Schmitt <ralf@bunkertor.net>
   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 #ifndef DEBOUNCE
  29 #   define DEBOUNCE 0
  30 #endif
  31 static uint8_t debouncing = DEBOUNCE;
  32
  33 /* matrix state(1:on, 0:off) */
  34 static matrix_row_t matrix[MATRIX_ROWS];
  35 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  36
  37 static uint8_t read_rows(void);
  38 static uint8_t read_fwkey(void);
  39 static void init_rows(void);
  40 static void unselect_cols(void);
  41 static void select_col(uint8_t col);
  42
  43 inline
  44 uint8_t matrix_rows(void)
  45 {
  46     return MATRIX_ROWS;
  47 }
  48
  49 inline
  50 uint8_t matrix_cols(void)
  51 {
  52     return MATRIX_COLS;
  53 }
  54
  55 void matrix_init(void)
  56 {
  57     unselect_cols();
  58     init_rows();
  59     // initialize matrix state: all keys off
  60     for (uint8_t i=0; i < MATRIX_ROWS; i++)  {
  61         matrix[i] = 0;
  62         matrix_debouncing[i] = 0;
  63     }
  64 }
  65
  66 uint8_t matrix_scan(void)
  67 {
  68     for (uint8_t col = 0; col < MATRIX_COLS; col++) {  // 0-17
  69         select_col(col);
  70         _delay_us(3); // TODO: Determine the correct value needed here.
  71         uint8_t rows = read_rows();
  72         // Use the otherwise unused col: 12 row: 3 for firmware.
  73         if(col == 12) {
  74             rows |= read_fwkey();
  75         }
  76         for (uint8_t row = 0; row < MATRIX_ROWS; row++) {  // 0-5
  77             bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
  78             bool curr_bit = rows & (1<<row);
  79             if (prev_bit != curr_bit) {
  80                 matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
  81                 if (debouncing) {
  82                     dprint("bounce!: "); dprintf("%02X", debouncing); dprintln();
  83                 }
  84                 debouncing = DEBOUNCE;
  85             }
  86         }
  87         unselect_cols();
  88     }
  89
  90     if (debouncing) {
  91         if (--debouncing) {
  92             _delay_ms(1);
  93         } else {
  94             for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  95                 matrix[i] = matrix_debouncing[i];
  96             }
  97         }
  98     }
  99
 100     return 1;
 101 }
 102
 103 bool matrix_is_modified(void)
 104 {
 105     if (debouncing) return false;
 106     return true;
 107 }
 108
 109 inline
 110 bool matrix_is_on(uint8_t row, uint8_t col)
 111 {
 112     return (matrix[row] & ((matrix_row_t)1<<col));
 113 }
 114
 115 inline
 116 matrix_row_t matrix_get_row(uint8_t row)
 117 {
 118     return matrix[row];
 119 }
 120
 121 void matrix_print(void)
 122 {
 123     print("\nr/c 0123456789ABCDEF\n");
 124     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 125         xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row)));
 126     }
 127 }
 128
 129 uint8_t matrix_key_count(void)
 130 {
 131     uint8_t count = 0;
 132     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 133         count += bitpop32(matrix[i]);
 134     }
 135     return count;
 136 }
 137
 138 /* Row pin configuration
 139  * row: 0    1    2    3    4    5
 140  * pin: PD0  PD1  PD2  PD3  PD5  PB7
 141  *
 142  * Firmware uses its own pin PE2
 143  */
 144 static void init_rows(void)
 145 {
 146     // Input (DDR:0, PORT:0)
 147     DDRD  &= ~0b00101111;
 148     PORTD &= ~0b00101111;
 149     DDRB  &= ~(1<<7);
 150     PORTB &= ~(1<<7);
 151
 152     // Input with pull-up (DDR:0, PORT:1)
 153     DDRE &= ~(1<<2);
 154     PORTE |= (1<<2);
 155 }
 156
 157 static uint8_t read_rows(void)
 158 {
 159     return (PIND&(1<<0) ? (1<<0) : 0) |
 160            (PIND&(1<<1) ? (1<<1) : 0) |
 161            (PIND&(1<<2) ? (1<<2) : 0) |
 162            (PIND&(1<<3) ? (1<<3) : 0) |
 163            (PIND&(1<<5) ? (1<<4) : 0) |
 164            (PINB&(1<<7) ? (1<<5) : 0);
 165 }
 166
 167 static uint8_t read_fwkey(void)
 168 {
 169     return PINE&(1<<2) ? 0 : (1<<3);
 170 }
 171
 172 /* Columns 0 - 15
 173  * These columns uses two 74HC237D 3 to 8 bit demultiplexers.
 174  * col / pin:    PC6  PB6  PF0  PF1  PC7
 175  * 0:             1    0    0    0    0
 176  * 1:             1    0    1    0    0
 177  * 2:             1    0    0    1    0
 178  * 3:             1    0    1    1    0
 179  * 4:             1    0    0    0    1
 180  * 5:             1    0    1    0    1
 181  * 6:             1    0    0    1    1
 182  * 7:             1    0    1    1    1
 183  * 8:             0    1    0    0    0
 184  * 9:             0    1    1    0    0
 185  * 10:            0    1    0    1    0
 186  * 11:            0    1    1    1    0
 187  * 12:            0    1    0    0    1
 188  * 13:            0    1    1    0    1
 189  * 14:            0    1    0    1    1
 190  * 15:            0    1    1    1    1
 191  *
 192  * col: 16
 193  * pin: PB5
 194  *
 195  * col: 17
 196  * pin: PD4
 197  */
 198 static void unselect_cols(void)
 199 {
 200     DDRB |= (1<<5) | (1<<6);
 201     PORTB &= ~((1<<5) | (1<<6));
 202
 203     DDRC |= (1<<6) | (1<<7);
 204     PORTC &= ~((1<<6) | (1<<7));
 205
 206     DDRD |= (1<<4);
 207     PORTD &= ~(1<<4);
 208
 209     DDRF |= (1<<0) | (1<<1);
 210     PORTF &= ~((1<<0) | (1<<1));
 211 }
 212
 213 static void select_col(uint8_t col)
 214 {
 215     // Output high (DDR:1, PORT:1) to select
 216     switch (col) {
 217         case 0:
 218             PORTC |= (1<<6);
 219             break;
 220         case 1:
 221             PORTC |= (1<<6);
 222             PORTF |= (1<<0);
 223             break;
 224         case 2:
 225             PORTC |= (1<<6);
 226             PORTF |= (1<<1);
 227             break;
 228         case 3:
 229             PORTC |= (1<<6);
 230             PORTF |= (1<<0) | (1<<1);
 231             break;
 232         case 4:
 233             PORTC |= (1<<6);
 234             PORTC |= (1<<7);
 235             break;
 236         case 5:
 237             PORTC |= (1<<6);
 238             PORTF |= (1<<0);
 239             PORTC |= (1<<7);
 240             break;
 241         case 6:
 242             PORTC |= (1<<6);
 243             PORTF |= (1<<1);
 244             PORTC |= (1<<7);
 245             break;
 246         case 7:
 247             PORTC |= (1<<6);
 248             PORTF |= (1<<0) | (1<<1);
 249             PORTC |= (1<<7);
 250             break;
 251         case 8:
 252             PORTB |= (1<<6);
 253             break;
 254         case 9:
 255             PORTB |= (1<<6);
 256             PORTF |= (1<<0);
 257             break;
 258         case 10:
 259             PORTB |= (1<<6);
 260             PORTF |= (1<<1);
 261             break;
 262         case 11:
 263             PORTB |= (1<<6);
 264             PORTF |= (1<<0) | (1<<1);
 265             break;
 266         case 12:
 267             PORTB |= (1<<6);
 268             PORTC |= (1<<7);
 269             break;
 270         case 13:
 271             PORTB |= (1<<6);
 272             PORTF |= (1<<0);
 273             PORTC |= (1<<7);
 274             break;
 275         case 14:
 276             PORTB |= (1<<6);
 277             PORTF |= (1<<1);
 278             PORTC |= (1<<7);
 279             break;
 280         case 15:
 281             PORTB |= (1<<6);
 282             PORTF |= (1<<0) | (1<<1);
 283             PORTC |= (1<<7);
 284             break;
 285         case 16:
 286             PORTB |= (1<<5);
 287             break;
 288         case 17:
 289             PORTD |= (1<<4);
 290             break;
 291     }
 292 }