summaryrefslogtreecommitdiffstats
path: root/keyboards/ergodone/matrix.c
blob: 2eb8f24ba8bf12f38c1b9d82d5a034b127bd2365 (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
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include "wait.h"
#include "action_layer.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#include "ergodone.h"
#include "expander.h"
#ifdef DEBUG_MATRIX_SCAN_RATE
#include  "timer.h"
#endif

/*
 * This constant define not debouncing time in msecs, but amount of matrix
 * scan loops which should be made to get stable debounced results.
 *
 * On Ergodox matrix scan rate is relatively low, because of slow I2C.
 * Now it's only 317 scans/second, or about 3.15 msec/scan.
 * According to Cherry specs, debouncing time is 5 msec.
 *
 * And so, there is no sense to have DEBOUNCE higher than 2.
 */

#ifndef DEBOUNCE
#   define DEBOUNCE	5
#endif

/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];

// Debouncing: store for each key the number of scans until it's eligible to
// change.  When scanning the matrix, ignore any changes in keys that have
// already changed in the last DEBOUNCE scans.
static uint8_t debounce_matrix[MATRIX_ROWS * MATRIX_COLS];

static matrix_row_t read_cols(uint8_t row);
static void init_cols(void);
static void unselect_rows(void);
static void select_row(uint8_t row);

#ifdef DEBUG_MATRIX_SCAN_RATE
uint32_t matrix_timer;
uint32_t matrix_scan_count;
#endif


__attribute__ ((weak))
void matrix_init_user(void) {}

__attribute__ ((weak))
void matrix_scan_user(void) {}

__attribute__ ((weak))
void matrix_init_kb(void) {
  matrix_init_user();
}

__attribute__ ((weak))
void matrix_scan_kb(void) {
  matrix_scan_user();
}

inline
uint8_t matrix_rows(void)
{
  return MATRIX_ROWS;
}

inline
uint8_t matrix_cols(void)
{
  return MATRIX_COLS;
}

void matrix_init(void)
{
  // disable JTAG
  MCUCR = (1<<JTD);
  MCUCR = (1<<JTD);

  unselect_rows();
  init_cols();

  // initialize matrix state: all keys off
  for (uint8_t i=0; i < MATRIX_ROWS; i++) {
    matrix[i] = 0;
    for (uint8_t j=0; j < MATRIX_COLS; ++j) {
      debounce_matrix[i * MATRIX_COLS + j] = 0;
    }
  }

#ifdef DEBUG_MATRIX_SCAN_RATE
  matrix_timer = timer_read32();
  matrix_scan_count = 0;
#endif

  matrix_init_quantum();

}

void matrix_power_up(void) {
  unselect_rows();
  init_cols();

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

#ifdef DEBUG_MATRIX_SCAN_RATE
  matrix_timer = timer_read32();
  matrix_scan_count = 0;
#endif
}

// Returns a matrix_row_t whose bits are set if the corresponding key should be
// eligible to change in this scan.
matrix_row_t debounce_mask(uint8_t row) {
  matrix_row_t result = 0;
  for (uint8_t j=0; j < MATRIX_COLS; ++j) {
    if (debounce_matrix[row * MATRIX_COLS + j]) {
      --debounce_matrix[row * MATRIX_COLS + j];
    } else {
      result |= (1 << j);
    }
  }
  return result;
}

// Report changed keys in the given row.  Resets the debounce countdowns
// corresponding to each set bit in 'change' to DEBOUNCE.
void debounce_report(matrix_row_t change, uint8_t row) {
  for (uint8_t i = 0; i < MATRIX_COLS; ++i) {
    if (change & (1 << i)) {
      debounce_matrix[row * MATRIX_COLS + i] = DEBOUNCE;
    }
  }
}

uint8_t matrix_scan(void)
{
  expander_scan();

#ifdef DEBUG_MATRIX_SCAN_RATE
  matrix_scan_count++;

  uint32_t timer_now = timer_read32();
  if (TIMER_DIFF_32(timer_now, matrix_timer)>1000) {
    print("matrix scan frequency: ");
    pdec(matrix_scan_count);
    print("\n");
    matrix_print();

    matrix_timer = timer_now;
    matrix_scan_count = 0;
  }
#endif

  for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
    select_row(i);
    wait_us(30);  // without this wait read unstable value.
    matrix_row_t mask = debounce_mask(i);
    matrix_row_t cols = (read_cols(i) & mask) | (matrix[i] & ~mask);
    debounce_report(cols ^ matrix[i], i);
    matrix[i] = cols;

    unselect_rows();
  }

  matrix_scan_quantum();

  return 1;
}

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

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

void matrix_print(void)
{
  print("\nr/c 0123456789ABCDEF\n");
  for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
    phex(row); print(": ");
    pbin_reverse16(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++) {
    count += bitpop16(matrix[i]);
  }
  return count;
}

/* Column pin configuration
 *
 * Pro Micro: 6    5    4    3    2    1    0
 *            PD3  PD2  PD4  PC6  PD7  PE6  PB4
 *
 * Expander:  13   12   11   10   9    8    7
 */
static void  init_cols(void)
{
  // Pro Micro
  DDRE  &= ~(1<<PE6);
  PORTE |=  (1<<PE6);
  DDRD  &= ~(1<<PD2 | 1<<PD3 | 1<<PD4 | 1<<PD7);
  PORTD |=  (1<<PD2 | 1<<PD3 | 1<<PD4 | 1<<PD7);
  DDRC  &= ~(1<<PC6);
  PORTC |=  (1<<PC6);
  DDRB  &= ~(1<<PB4);
  PORTB |=  (1<<PB4);

  // MCP23017
  expander_init();
}

static matrix_row_t read_cols(uint8_t row)
{
  return expander_read_row() |
    (PIND&(1<<PD3) ? 0 : (1<<6)) |
    (PIND&(1<<PD2) ? 0 : (1<<5)) |
    (PIND&(1<<PD4) ? 0 : (1<<4)) |
    (PINC&(1<<PC6) ? 0 : (1<<3)) |
    (PIND&(1<<PD7) ? 0 : (1<<2)) |
    (PINE&(1<<PE6) ? 0 : (1<<1)) |
    (PINB&(1<<PB4) ? 0 : (1<<0)) ;
}

/* Row pin configuration
 *
 * Pro Micro: 0   1   2   3   4   5
 *            F4  F5  F6  F7  B1  B2
 *
 * Expander:  0   1   2   3   4   5
 */
static void unselect_rows(void)
{
  // Pro Micro
  DDRF  &= ~(1<<PF4 | 1<<PF5 | 1<<PF6 | 1<<PF7);
  PORTF &= ~(1<<PF4 | 1<<PF5 | 1<<PF6 | 1<<PF7);
  DDRB  &= ~(1<<PB1 | 1<<PB2);
  PORTB &= ~(1<<PB1 | 1<<PB2);

  // Expander
  expander_unselect_rows();
}

static void select_row(uint8_t row)
{
  // Pro Micro
  switch (row) {
  case 0:
    DDRF  |=  (1<<PF4);
    PORTF &= ~(1<<PF4);
    break;
  case 1:
    DDRF  |=  (1<<PF5);
    PORTF &= ~(1<<PF5);
    break;
  case 2:
    DDRF  |=  (1<<PF6);
    PORTF &= ~(1<<PF6);
    break;
  case 3:
    DDRF  |=  (1<<PF7);
    PORTF &= ~(1<<PF7);
    break;
  case 4:
    DDRB  |=  (1<<PB1);
    PORTB &= ~(1<<PB1);
    break;
  case 5:
    DDRB  |=  (1<<PB2);
    PORTB &= ~(1<<PB2);
    break;
  }

  expander_select_row(row);
}