summaryrefslogtreecommitdiffstats
path: root/keyboard/phantom/matrix.c
blob: 07f3f428924596f9624ebc40c9f57dd442f8c5c2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
/* Copyright 2012 Jun Wako <wakojun@gmail.com>
 *
 * This is heavily based on phantom/board.{c|h}.
 * https://github.com/BathroomEpiphanies/AVR-Keyboard
 *
 * Copyright (c) 2012 Fredrik Atmer, Bathroom Epiphanies Inc
 * http://bathroomepiphanies.com
 *
 * As for liscensing consult with the original files or its author.
 */
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <util/delay.h>
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"


#ifndef DEBOUNCE
#   define DEBOUNCE	0
#endif
static uint8_t debouncing = DEBOUNCE;

// bit array of key state(1:on, 0:off)
static matrix_row_t *matrix;
static matrix_row_t *matrix_debounced;
static matrix_row_t _matrix0[MATRIX_ROWS];
static matrix_row_t _matrix1[MATRIX_ROWS];


#define _DDRA (uint8_t *const)&DDRA
#define _DDRB (uint8_t *const)&DDRB
#define _DDRC (uint8_t *const)&DDRC
#define _DDRD (uint8_t *const)&DDRD
#define _DDRE (uint8_t *const)&DDRE
#define _DDRF (uint8_t *const)&DDRF

#define _PINA (uint8_t *const)&PINA
#define _PINB (uint8_t *const)&PINB
#define _PINC (uint8_t *const)&PINC
#define _PIND (uint8_t *const)&PIND
#define _PINE (uint8_t *const)&PINE
#define _PINF (uint8_t *const)&PINF

#define _PORTA (uint8_t *const)&PORTA
#define _PORTB (uint8_t *const)&PORTB
#define _PORTC (uint8_t *const)&PORTC
#define _PORTD (uint8_t *const)&PORTD
#define _PORTE (uint8_t *const)&PORTE
#define _PORTF (uint8_t *const)&PORTF

#define _BIT0 0x01
#define _BIT1 0x02
#define _BIT2 0x04
#define _BIT3 0x08
#define _BIT4 0x10
#define _BIT5 0x20
#define _BIT6 0x40
#define _BIT7 0x80

/* Specifies the ports and pin numbers for the rows */
static
uint8_t *const row_ddr[MATRIX_ROWS] = {_DDRB,  _DDRB,  _DDRB,  _DDRB,  _DDRB,  _DDRB};

static
uint8_t *const row_port[MATRIX_ROWS] = {_PORTB, _PORTB, _PORTB, _PORTB, _PORTB, _PORTB};

static
uint8_t *const row_pin[MATRIX_ROWS] = {_PINB,  _PINB,  _PINB,  _PINB,  _PINB,  _PINB};

static
const uint8_t row_bit[MATRIX_ROWS] = { _BIT0,  _BIT1,  _BIT2,  _BIT3,  _BIT4,  _BIT5};

/* Specifies the ports and pin numbers for the columns */
static
uint8_t *const  col_ddr[MATRIX_COLS] = { _DDRD,  _DDRC,  _DDRC,  _DDRD,  _DDRD,  _DDRE,
				  _DDRF,  _DDRF,  _DDRF,  _DDRF,  _DDRF,  _DDRF,
				  _DDRD,  _DDRD,  _DDRD,  _DDRD,  _DDRD};

static
uint8_t *const col_port[MATRIX_COLS] = {_PORTD, _PORTC, _PORTC, _PORTD, _PORTD, _PORTE,
				 _PORTF, _PORTF, _PORTF, _PORTF, _PORTF, _PORTF,
				 _PORTD, _PORTD, _PORTD, _PORTD, _PORTD};

static
const uint8_t   col_bit[MATRIX_COLS] = {  _BIT5,  _BIT7,  _BIT6,  _BIT4,  _BIT0,  _BIT6,
				  _BIT0,  _BIT1,  _BIT4,  _BIT5,  _BIT6,  _BIT7,
				  _BIT7,  _BIT6,  _BIT1,  _BIT2,  _BIT3};

static
inline void pull_column(int col) {
  *col_port[col] &= ~col_bit[col];
}

static
inline void release_column(int col) {
  *col_port[col] |=  col_bit[col];
}

/* PORTB is set as input with pull-up resistors
   PORTC,D,E,F are set to high output */

static
void setup_io_pins(void) {
  uint8_t row, col;
  for(row = 0; row < MATRIX_ROWS; row++) {
    *row_ddr[row]  &= ~row_bit[row];
    *row_port[row] |=  row_bit[row];
  }
  for(col = 0; col < MATRIX_COLS; col++) {
    *col_ddr[col]  |= col_bit[col];
    *col_port[col] |= col_bit[col];
  }
}

/* LEDs are on output compare pins OC1B OC1C
   This activates fast PWM mode on them.
   Prescaler 256 and 8-bit counter results in
   16000000/256/256 = 244 Hz blink frequency.
   LED_A: Caps Lock
   LED_B: Scroll Lock  */
/* Output on PWM pins are turned off when the timer 
   reaches the value in the output compare register,
   and are turned on when it reaches TOP (=256). */
static
void setup_leds(void) {
  TCCR1A |=      // Timer control register 1A
    (1<<WGM10) | // Fast PWM 8-bit
    (1<<COM1B1)| // Clear OC1B on match, set at TOP
    (1<<COM1C1); // Clear OC1C on match, set at TOP
  TCCR1B |=      // Timer control register 1B
    (1<<WGM12) | // Fast PWM 8-bit
    (1<<CS12);   // Prescaler 256
  OCR1B = 250;    // Output compare register 1B
  OCR1C = 250;    // Output compare register 1C
  // LEDs: LED_A -> PORTB6, LED_B -> PORTB7
  DDRB  &= 0x3F;
  PORTB &= 0x3F;
}


inline
uint8_t matrix_rows(void)
{
    return MATRIX_ROWS;
}

inline
uint8_t matrix_cols(void)
{
    return MATRIX_COLS;
}

void matrix_init(void)
{
    // To use PORTF disable JTAG with writing JTD bit twice within four cycles.
    MCUCR |= (1<<JTD);
    MCUCR |= (1<<JTD);
	
    // initialize row and col
    setup_io_pins();
    setup_leds();

    // initialize matrix state: all keys off
    for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
    for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
    matrix = _matrix0;
    matrix_debounced = _matrix1;
}

uint8_t matrix_scan(void)
{
    if (!debouncing) {
        matrix_row_t *tmp = matrix_debounced;
        matrix_debounced = matrix;
        matrix = tmp;
    }

    for (uint8_t col = 0; col < MATRIX_COLS; col++) {  // 0-16
        pull_column(col);   // output hi on theline
        _delay_us(3);       // without this wait it won't read stable value.
        for (uint8_t row = 0; row < MATRIX_ROWS; row++) {  // 0-5
            bool prev_bit = matrix[row] & ((matrix_row_t)1<<col);
            bool curr_bit = !(*row_pin[row] & row_bit[row]);
            if (prev_bit != curr_bit) {
                matrix[row] ^= ((matrix_row_t)1<<col);
                if (debouncing) {
                    debug("bounce!: "); debug_hex(debouncing); print("\n");
                }
                debouncing = DEBOUNCE;
            }
        }
        release_column(col);
    }

    if (debouncing) {
        debouncing--;
    }

    return 1;
}

bool matrix_is_modified(void)
{
    // NOTE: no longer used
    return true;
}

inline
bool matrix_has_ghost(void)
{
    return false;
}

inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
    return (matrix_debounced[row] & ((matrix_row_t)1<<col));
}

inline
matrix_row_t matrix_get_row(uint8_t row)
{
    return matrix_debounced[row];
}

void matrix_print(void)
{
    print("\nr/c 01234567\n");
    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
        phex(row); print(": ");
        pbin_reverse(matrix_get_row(row));
        print("\n");
    }
}

uint8_t matrix_key_count(void)
{
    uint8_t count = 0;
    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
        for (uint8_t j = 0; j < MATRIX_COLS; j++) {
            if (matrix_is_on(i, j))
                count++;
        }
    }
    return count;
}