orphan/phantom/matrix.c

   1 /* Copyright 2012 Jun Wako <wakojun@gmail.com>
   2  *
   3  * This is heavily based on phantom/board.{c|h}.
   4  * https://github.com/BathroomEpiphanies/AVR-Keyboard
   5  *
   6  * Copyright (c) 2012 Fredrik Atmer, Bathroom Epiphanies Inc
   7  * http://bathroomepiphanies.com
   8  *
   9  * As for liscensing consult with the original files or its author.
  10  */
  11 #include <stdint.h>
  12 #include <stdbool.h>
  13 #include <avr/io.h>
  14 #include <util/delay.h>
  15 #include "print.h"
  16 #include "debug.h"
  17 #include "util.h"
  18 #include "matrix.h"
  19
  20
  21 #ifndef DEBOUNCE
  22 #   define DEBOUNCE     0
  23 #endif
  24 static uint8_t debouncing = DEBOUNCE;
  25
  26 // bit array of key state(1:on, 0:off)
  27 static matrix_row_t matrix[MATRIX_ROWS];
  28 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  29
  30 static uint8_t read_rows(void);
  31 static void init_rows(void);
  32 static void unselect_cols(void);
  33 static void select_col(uint8_t col);
  34
  35 #ifndef SLEEP_LED_ENABLE
  36 /* LEDs are on output compare pins OC1B OC1C
  37    This activates fast PWM mode on them.
  38    Prescaler 256 and 8-bit counter results in
  39    16000000/256/256 = 244 Hz blink frequency.
  40    LED_A: Caps Lock
  41    LED_B: Scroll Lock  */
  42 /* Output on PWM pins are turned off when the timer
  43    reaches the value in the output compare register,
  44    and are turned on when it reaches TOP (=256). */
  45 static
  46 void setup_leds(void)
  47 {
  48     TCCR1A |=      // Timer control register 1A
  49         (1<<WGM10) | // Fast PWM 8-bit
  50         (1<<COM1B1)| // Clear OC1B on match, set at TOP
  51         (1<<COM1C1); // Clear OC1C on match, set at TOP
  52     TCCR1B |=      // Timer control register 1B
  53         (1<<WGM12) | // Fast PWM 8-bit
  54         (1<<CS12);   // Prescaler 256
  55     OCR1B = LED_BRIGHTNESS;    // Output compare register 1B
  56     OCR1C = LED_BRIGHTNESS;    // Output compare register 1C
  57     // LEDs: LED_A -> PORTB6, LED_B -> PORTB7
  58     DDRB  |= (1<<6) | (1<<7);
  59     PORTB  &= ~((1<<6) | (1<<7));
  60 }
  61 #endif
  62
  63 inline
  64 uint8_t matrix_rows(void)
  65 {
  66     return MATRIX_ROWS;
  67 }
  68
  69 inline
  70 uint8_t matrix_cols(void)
  71 {
  72     return MATRIX_COLS;
  73 }
  74
  75 void matrix_init(void)
  76 {
  77     // To use PORTF disable JTAG with writing JTD bit twice within four cycles.
  78     MCUCR |= (1<<JTD);
  79     MCUCR |= (1<<JTD);
  80
  81     // initialize row and col
  82     unselect_cols();
  83     init_rows();
  84 #ifndef SLEEP_LED_ENABLE
  85     setup_leds();
  86 #endif
  87
  88     // initialize matrix state: all keys off
  89     for (uint8_t i = 0; i < MATRIX_ROWS; i++)  {
  90         matrix[i] = 0;
  91         matrix_debouncing[i] = 0;
  92     }
  93 }
  94
  95 uint8_t matrix_scan(void)
  96 {
  97     for (uint8_t col = 0; col < MATRIX_COLS; col++) {  // 0-16
  98         select_col(col);
  99         _delay_us(3);       // without this wait it won't read stable value.
 100         uint8_t rows = read_rows();
 101         for (uint8_t row = 0; row < MATRIX_ROWS; row++) {  // 0-5
 102             bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
 103             bool curr_bit = rows & (1<<row);
 104             if (prev_bit != curr_bit) {
 105                 matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
 106                 if (debouncing) {
 107                     dprint("bounce!: "); dprintf("%02X", debouncing); dprintln();
 108                 }
 109                 debouncing = DEBOUNCE;
 110             }
 111         }
 112         unselect_cols();
 113     }
 114
 115     if (debouncing) {
 116         if (--debouncing) {
 117             _delay_ms(1);
 118         } else {
 119             for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 120                 matrix[i] = matrix_debouncing[i];
 121             }
 122         }
 123     }
 124
 125     return 1;
 126 }
 127
 128 bool matrix_is_modified(void)
 129 {
 130     if (debouncing) return false;
 131     return true;
 132 }
 133
 134 inline
 135 bool matrix_is_on(uint8_t row, uint8_t col)
 136 {
 137     return (matrix[row] & ((matrix_row_t)1<<col));
 138 }
 139
 140 inline
 141 matrix_row_t matrix_get_row(uint8_t row)
 142 {
 143     return matrix[row];
 144 }
 145
 146 void matrix_print(void)
 147 {
 148     print("\nr/c 0123456789ABCDEF\n");
 149     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 150         xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row)));
 151     }
 152 }
 153
 154 uint8_t matrix_key_count(void)
 155 {
 156     uint8_t count = 0;
 157     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 158         count += bitpop32(matrix[i]);
 159     }
 160     return count;
 161 }
 162
 163 /* Row pin configuration
 164  * row: 0   1   2   3   4   5
 165  * pin: B5  B4  B3  B2  B1  B0
 166  */
 167 static void init_rows(void)
 168 {
 169     // Input with pull-up(DDR:0, PORT:1)
 170     DDRB  &= ~0b00111111;
 171     PORTB |= 0b00111111;
 172 }
 173
 174 static uint8_t read_rows(void)
 175 {
 176     return (PINB&(1<<5) ? 0 : (1<<0)) |
 177            (PINB&(1<<4) ? 0 : (1<<1)) |
 178            (PINB&(1<<3) ? 0 : (1<<2)) |
 179            (PINB&(1<<2) ? 0 : (1<<3)) |
 180            (PINB&(1<<1) ? 0 : (1<<4)) |
 181            (PINB&(1<<0) ? 0 : (1<<5));
 182 }
 183
 184 /* Column pin configuration
 185  * col: 0   1   2   3   4   5   6   7   8   9   10  11  12  13  14  15  16
 186  * pin: D5  C7  C6  D4  D0  E6  F0  F1  F4  F5  F6  F7  D7  D6  D1  D2  D3
 187  */
 188 static void unselect_cols(void)
 189 {
 190     // Hi-Z(DDR:0, PORT:0) to unselect
 191     DDRC  |= 0b11000000; // PC: 7 6
 192     PORTC |= 0b11000000;
 193     DDRD  |= 0b11111111; // PD: 7 6 5 4 3 2 1 0
 194     PORTD |= 0b11111111;
 195     DDRE  |= 0b01000000; // PE: 6
 196     PORTE |= 0b01000000;
 197     DDRF  |= 0b11110011; // PF: 7 6 5 4 1 0
 198     PORTF |= 0b11110011;
 199 }
 200
 201 static void select_col(uint8_t col)
 202 {
 203     // Output low(DDR:1, PORT:0) to select
 204     switch (col) {
 205         case 0:
 206             DDRD  |= (1<<5);
 207             PORTD &= ~(1<<5);
 208             break;
 209         case 1:
 210             DDRC  |= (1<<7);
 211             PORTC &= ~(1<<7);
 212             break;
 213         case 2:
 214             DDRC  |= (1<<6);
 215             PORTC &= ~(1<<6);
 216             break;
 217         case 3:
 218             DDRD  |= (1<<4);
 219             PORTD &= ~(1<<4);
 220             break;
 221         case 4:
 222             DDRD  |= (1<<0);
 223             PORTD &= ~(1<<0);
 224             break;
 225         case 5:
 226             DDRE  |= (1<<6);
 227             PORTE &= ~(1<<6);
 228             break;
 229         case 6:
 230             DDRF  |= (1<<0);
 231             PORTF &= ~(1<<0);
 232             break;
 233         case 7:
 234             DDRF  |= (1<<1);
 235             PORTF &= ~(1<<1);
 236             break;
 237         case 8:
 238             DDRF  |= (1<<4);
 239             PORTF &= ~(1<<4);
 240             break;
 241         case 9:
 242             DDRF  |= (1<<5);
 243             PORTF &= ~(1<<5);
 244             break;
 245         case 10:
 246             DDRF  |= (1<<6);
 247             PORTF &= ~(1<<6);
 248             break;
 249         case 11:
 250             DDRF  |= (1<<7);
 251             PORTF &= ~(1<<7);
 252             break;
 253         case 12:
 254             DDRD  |= (1<<7);
 255             PORTD &= ~(1<<7);
 256             break;
 257         case 13:
 258             DDRD  |= (1<<6);
 259             PORTD &= ~(1<<6);
 260             break;
 261         case 14:
 262             DDRD  |= (1<<1);
 263             PORTD &= ~(1<<1);
 264             break;
 265         case 15:
 266             DDRD  |= (1<<2);
 267             PORTD &= ~(1<<2);
 268             break;
 269         case 16:
 270             DDRD  |= (1<<3);
 271             PORTD &= ~(1<<3);
 272             break;
 273     }
 274 }