keyboard/hid_liber/matrix.c

   1 /* Copyright 2012 Jun Wako <wakojun@gmail.com>
   2  *
   3  * This is heavily based on hid_liber/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     5
  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;
  28 static matrix_row_t *matrix_debounced;
  29 static matrix_row_t _matrix0[MATRIX_ROWS];
  30 static matrix_row_t _matrix1[MATRIX_ROWS];
  31
  32
  33 #define NROW 18
  34 #define NCOL 8
  35 #define _DDRA (uint8_t *const)&DDRA
  36 #define _DDRB (uint8_t *const)&DDRB
  37 #define _DDRC (uint8_t *const)&DDRC
  38 #define _DDRD (uint8_t *const)&DDRD
  39 #define _DDRE (uint8_t *const)&DDRE
  40 #define _DDRF (uint8_t *const)&DDRF
  41
  42 #define _PINA (uint8_t *const)&PINA
  43 #define _PINB (uint8_t *const)&PINB
  44 #define _PINC (uint8_t *const)&PINC
  45 #define _PIND (uint8_t *const)&PIND
  46 #define _PINE (uint8_t *const)&PINE
  47 #define _PINF (uint8_t *const)&PINF
  48
  49 #define _PORTA (uint8_t *const)&PORTA
  50 #define _PORTB (uint8_t *const)&PORTB
  51 #define _PORTC (uint8_t *const)&PORTC
  52 #define _PORTD (uint8_t *const)&PORTD
  53 #define _PORTE (uint8_t *const)&PORTE
  54 #define _PORTF (uint8_t *const)&PORTF
  55
  56 #define _BIT0 0x01
  57 #define _BIT1 0x02
  58 #define _BIT2 0x04
  59 #define _BIT3 0x08
  60 #define _BIT4 0x10
  61 #define _BIT5 0x20
  62 #define _BIT6 0x40
  63 #define _BIT7 0x80
  64
  65 /* Specifies the ports and pin numbers for the rows */
  66 static
  67 uint8_t *const  row_ddr[NROW] = {                                 _DDRB,                  _DDRB,
  68                                                                                   _DDRC,  _DDRC,
  69                                   _DDRD,  _DDRD,  _DDRD,  _DDRD,  _DDRD,  _DDRD,  _DDRD,  _DDRD,
  70                                   _DDRF,  _DDRF,                  _DDRF,  _DDRF,  _DDRF,  _DDRF};
  71
  72 static
  73 uint8_t *const row_port[NROW] = {                                _PORTB,                 _PORTB,
  74                                  _PORTC, _PORTC,
  75                                  _PORTD, _PORTD, _PORTD, _PORTD, _PORTD, _PORTD, _PORTD, _PORTD,
  76                                  _PORTF, _PORTF,                 _PORTF, _PORTF, _PORTF, _PORTF};
  77
  78 static
  79 uint8_t *const  row_pin[NROW] = {                                 _PINB,                  _PINB,
  80                                   _PINC,  _PINC,
  81                                   _PIND,  _PIND,  _PIND,  _PIND,  _PIND,  _PIND,  _PIND,  _PIND,
  82                                   _PINF,  _PINF,                  _PINF,  _PINF,  _PINF,  _PINF};
  83
  84 static
  85 const uint8_t   row_bit[NROW] = {                                 _BIT4,                  _BIT7,
  86                                                                                   _BIT6,  _BIT7,
  87                                   _BIT0,  _BIT1,  _BIT2,  _BIT3,  _BIT4,  _BIT5,  _BIT6,  _BIT7,
  88                                   _BIT0,  _BIT1,                  _BIT4,  _BIT5,  _BIT6,  _BIT7};
  89
  90 static
  91 const uint8_t mask = 0x0E;
  92
  93 /* Specifies the ports and pin numbers for the columns */
  94 static
  95 const uint8_t   col_bit[NCOL] = {  0x00,   0x02,   0x04,   0x06,   0x08,   0x0A,   0x0C,   0x0E};
  96
  97 static
  98 inline void pull_column(int col) {
  99   PORTB = col_bit[col] | (PORTB & ~mask);
 100 }
 101
 102 static
 103 inline void release_column(int col) {
 104 }
 105
 106 /* PORTB is set as input with pull-up resistors
 107    PORTC,D,E,F are set to high output */
 108 static
 109 void setup_io_pins(void) {
 110   uint8_t row;
 111   DDRB  |=  0x0E;
 112   PORTB &= ~0x0E;
 113   for(row = 0; row < NROW; row++) {
 114     *row_ddr[row]  &= ~row_bit[row];
 115     *row_port[row] &= ~row_bit[row];
 116   }
 117 }
 118
 119 static
 120 void setup_leds(void) {
 121   DDRB  |=  0x60;
 122   PORTB |=  0x60;
 123 }
 124
 125
 126 inline
 127 uint8_t matrix_rows(void)
 128 {
 129     return MATRIX_ROWS;
 130 }
 131
 132 inline
 133 uint8_t matrix_cols(void)
 134 {
 135     return MATRIX_COLS;
 136 }
 137
 138 void matrix_init(void)
 139 {
 140     // To use PORTF disable JTAG with writing JTD bit twice within four cycles.
 141     MCUCR |= (1<<JTD);
 142     MCUCR |= (1<<JTD);
 143
 144     // initialize row and col
 145     setup_io_pins();
 146     setup_leds();
 147
 148     // initialize matrix state: all keys off
 149     for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
 150     for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
 151     matrix = _matrix0;
 152     matrix_debounced = _matrix1;
 153 }
 154
 155 uint8_t matrix_scan(void)
 156 {
 157     if (!debouncing) {
 158         uint8_t *tmp = matrix_debounced;
 159         matrix_debounced = matrix;
 160         matrix = tmp;
 161     }
 162
 163     for (uint8_t col = 0; col < NCOL; col++) {  // 0-7
 164         pull_column(col);   // output hi on theline
 165         _delay_us(1);       // without this wait it won't read stable value.
 166         for (uint8_t row = 0; row < NROW; row++) {  // 0-17
 167             bool prev_bit = matrix[row] & (1<<col);
 168             bool curr_bit = *row_pin[row] & row_bit[row];
 169             if (prev_bit != curr_bit) {
 170                 matrix[row] ^= (1<<col);
 171                 if (debouncing) {
 172                     debug("bounce!: "); debug_hex(debouncing); print("\n");
 173                 }
 174                 debouncing = DEBOUNCE;
 175             }
 176         }
 177         release_column(col);
 178     }
 179
 180     if (debouncing) {
 181         debouncing--;
 182     }
 183
 184     return 1;
 185 }
 186
 187 bool matrix_is_modified(void)
 188 {
 189     // NOTE: no longer used
 190     return true;
 191 }
 192
 193 inline
 194 bool matrix_has_ghost(void)
 195 {
 196     return false;
 197 }
 198
 199 inline
 200 bool matrix_is_on(uint8_t row, uint8_t col)
 201 {
 202     return (matrix_debounced[row] & (1<<col));
 203 }
 204
 205 inline
 206 matrix_row_t matrix_get_row(uint8_t row)
 207 {
 208     return matrix_debounced[row];
 209 }
 210
 211 void matrix_print(void)
 212 {
 213     print("\nr/c 01234567\n");
 214     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 215         phex(row); print(": ");
 216         pbin_reverse(matrix_get_row(row));
 217         print("\n");
 218     }
 219 }
 220
 221 uint8_t matrix_key_count(void)
 222 {
 223     uint8_t count = 0;
 224     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 225         for (uint8_t j = 0; j < MATRIX_COLS; j++) {
 226             if (matrix_is_on(i, j))
 227                 count++;
 228         }
 229     }
 230     return count;
 231 }