keyboard/nerd/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 #include "backlight.h"
  27
  28
  29 #ifndef DEBOUNCE
  30 #   define DEBOUNCE 5
  31 #endif
  32 static uint8_t debouncing = DEBOUNCE;
  33
  34 /* matrix state(1:on, 0:off) */
  35 static matrix_row_t matrix[MATRIX_ROWS];
  36 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  37
  38 static uint16_t read_inputs(void);
  39 static void init_inputs(void);
  40 static void init_outputs(void);
  41 static void reset_inputs(void);
  42 static void reset_outputs(void);
  43 static void select_output(uint8_t col);
  44
  45 inline
  46 uint8_t matrix_rows(void)
  47 {
  48     return MATRIX_ROWS;
  49 }
  50
  51 inline
  52 uint8_t matrix_cols(void)
  53 {
  54     return MATRIX_COLS;
  55 }
  56
  57 void matrix_init(void)
  58 {
  59     backlight_init_ports();
  60     init_inputs();
  61     init_outputs();
  62
  63     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
  64         matrix[i] = 0;
  65         matrix_debouncing[i] = 0;
  66     }
  67 }
  68
  69 uint8_t matrix_scan(void)
  70 {
  71     for (uint8_t col = 0; col < MATRIX_COLS; col++) {
  72         reset_inputs();
  73         reset_outputs();
  74         select_output(col);
  75         _delay_us(3);
  76         uint16_t rows = read_inputs();
  77         for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
  78             bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
  79             bool curr_bit = rows & (1<<row);
  80             if (prev_bit != curr_bit) {
  81                 matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
  82                 if (debouncing) {
  83                     dprint("bounce!: "); dprintf("%02X", debouncing); dprintln();
  84                 }
  85                 debouncing = DEBOUNCE;
  86             }
  87         }
  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         phex(row); print(": ");
 126         pbin_reverse16(matrix_get_row(row));
 127         print("\n");
 128     }
 129 }
 130
 131 uint8_t matrix_key_count(void)
 132 {
 133     uint8_t count = 0;
 134     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 135         count += bitpop16(matrix[i]);
 136     }
 137     return count;
 138 }
 139
 140 static void init_inputs(void)
 141 {
 142     DDRE &= ~0b01000000; // PE6 (Col 0)
 143     DDRB &= ~0b00001111; // PB0 (Col 1), PB1 (Col 2), PB2 (Col 3), PB3 (Col 4)
 144     DDRF &= ~0b00000001; // PF0 (Col 5)
 145     DDRD &= ~0b00100011; // PD0 (Col 6), PD1 (Col 8 TKL), PD5 (Col 7)
 146 }
 147
 148 static uint16_t read_inputs(void)
 149 {
 150     return (PINE&(1<<6) ? 0 : (1<<0)) |  // PE6 (Col 0)
 151            (PINB&(1<<0) ? 0 : (1<<1)) |  // PB0 (Col 1)
 152            (PINB&(1<<1) ? 0 : (1<<2)) |  // PB1 (Col 2)
 153            (PINB&(1<<2) ? 0 : (1<<3)) |  // PB2 (Col 3)
 154            (PINB&(1<<3) ? 0 : (1<<4)) |  // PB3 (Col 4)
 155            (PINF&(1<<0) ? 0 : (1<<5)) |  // PF0 (Col 5)
 156            (PIND&(1<<0) ? 0 : (1<<6)) |  // PD0 (Col 6)
 157            (PIND&(1<<5) ? 0 : (1<<7)) |  // PD5 (Col 7)
 158            (PIND&(1<<1) ? 0 : (1<<8));   // PD1 (Col 8 TKL)
 159 }
 160
 161 static void reset_inputs(void)
 162 {
 163     PORTE |= 0b01000000; // PE6 (Col 0)
 164     PORTB |= 0b00001111; // PB0 (Col 1), PB1 (Col 2), PB2 (Col 3), PB3 (Col 4)
 165     PORTF |= 0b00000001; // PF0 (Col 5)
 166     PORTD |= 0b00100011; // PD0 (Col 6), PD1 (Col 8 TKL), PD5 (Col 7)
 167 }
 168
 169 static void init_outputs(void)
 170 {
 171     DDRB |= 0b00010000; // PB4 (Row 0)
 172     DDRE |= 0b00000100; // PE2 (Row 1)
 173     DDRF |= 0b11110010; // PF4 (Row 2), PF7 (Row 3), PF1 (Row 4), PF6 (Row 5), PF5 (Row 7)
 174     DDRC |= 0b11000000; // PC6 (Row 6), PC7 (Row 9)
 175     DDRD |= 0b10000000; // PD7 (Row 8)
 176 }
 177
 178 static void reset_outputs(void)
 179 {
 180     PORTB |= 0b00010000; // PB4 (Row 0)
 181     PORTE |= 0b00000100; // PE2 (Row 1)
 182     PORTF |= 0b11110010; // PF4 (Row 2), PF7 (Row 3), PF1 (Row 4), PF6 (Row 5), PF5 (Row 7)
 183     PORTC |= 0b11000000; // PC6 (Row 6), PC7 (Row 9)
 184     PORTD |= 0b10000000; // PD7 (Row 8)
 185 }
 186
 187 static void select_output(uint8_t col)
 188 {
 189     switch (col) {
 190         case 0:
 191             PORTB &= ~(1<<4);
 192             break;
 193         case 1:
 194             PORTE &= ~(1<<2);
 195             break;
 196         case 2:
 197             PORTF &= ~(1<<4);
 198             break;
 199         case 3:
 200             PORTF &= ~(1<<7);
 201             break;
 202         case 4:
 203             PORTF &= ~(1<<1);
 204             break;
 205         case 5:
 206             PORTF &= ~(1<<6);
 207             break;
 208         case 6:
 209             PORTC &= ~(1<<6);
 210             break;
 211         case 7:
 212             PORTF &= ~(1<<5);
 213             break;
 214         case 8:
 215             PORTD &= ~(1<<7);
 216             break;
 217         case 9:
 218             PORTC &= ~(1<<7);
 219             break;
 220     }
 221 }