summaryrefslogtreecommitdiff
path: root/keyboards/ergodox_ez/matrix.c
blob: e1017113343feedd3e9daff0b2d744e5adaaea23 (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
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
/*

Note for ErgoDox EZ customizers: Here be dragons!
This is not a file you want to be messing with.
All of the interesting stuff for you is under keymaps/ :)
Love, Erez

Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/*
 * scan matrix
 */
#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 QMK_KEYBOARD_H
#include "i2cmaster.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.
 *
 * However, some switches seem to have higher debouncing requirements, or
 * something else might be wrong. (Also, the scan speed has improved since
 * that comment was written.)
 */

#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);

static uint8_t mcp23018_reset_loop;

#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)
{
    // initialize row and col

    mcp23018_status = init_mcp23018();


    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) {
    mcp23018_status = init_mcp23018();

    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)
{
    if (mcp23018_status) { // if there was an error
        if (++mcp23018_reset_loop == 0) {
            // since mcp23018_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
            // this will be approx bit more frequent than once per second
            print("trying to reset mcp23018\n");
            mcp23018_status = init_mcp23018();
            if (mcp23018_status) {
                print("left side not responding\n");
            } else {
                print("left side attached\n");
                ergodox_blink_all_leds();
            }
        }
    }

#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_timer = timer_now;
        matrix_scan_count = 0;
    }
#endif

#ifdef LEFT_LEDS
    mcp23018_status = ergodox_left_leds_update();
#endif // LEFT_LEDS
    for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
        select_row(i);
        // and select on left hand
        select_row(i + MATRIX_ROWS_PER_SIDE);
        // we don't need a 30us delay anymore, because selecting a
        // left-hand row requires more than 30us for i2c.
        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;
        // grab cols from right hand
        mask = debounce_mask(i + MATRIX_ROWS_PER_SIDE);
        cols = (read_cols(i + MATRIX_ROWS_PER_SIDE) & mask) | (matrix[i + MATRIX_ROWS_PER_SIDE] & ~mask);
        debounce_report(cols ^ matrix[i + MATRIX_ROWS_PER_SIDE], i + MATRIX_ROWS_PER_SIDE);
        matrix[i + MATRIX_ROWS_PER_SIDE] = cols;
        unselect_rows();
    }

    matrix_scan_quantum();

    return 1;
}

bool matrix_is_modified(void) // deprecated and evidently not called.
{
    return true;
}

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
 *
 * Teensy
 * col: 0   1   2   3   4   5
 * pin: F0  F1  F4  F5  F6  F7
 *
 * MCP23018
 * col: 0   1   2   3   4   5
 * pin: B5  B4  B3  B2  B1  B0
 */
static void  init_cols(void)
{
    // init on mcp23018
    // not needed, already done as part of init_mcp23018()

    // init on teensy
    // Input with pull-up(DDR:0, PORT:1)
    DDRF  &= ~(1<<7 | 1<<6 | 1<<5 | 1<<4 | 1<<1 | 1<<0);
    PORTF |=  (1<<7 | 1<<6 | 1<<5 | 1<<4 | 1<<1 | 1<<0);
}

static matrix_row_t read_cols(uint8_t row)
{
    if (row < 7) {
        if (mcp23018_status) { // if there was an error
            return 0;
        } else {
            uint8_t data = 0;
            mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
            mcp23018_status = i2c_write(GPIOB);             if (mcp23018_status) goto out;
            mcp23018_status = i2c_start(I2C_ADDR_READ);     if (mcp23018_status) goto out;
            data = i2c_readNak();
            data = ~data;
        out:
            i2c_stop();
            return data;
        }
    } else {
        /* read from teensy
	 * bitmask is 0b11110011, but we want those all
	 * in the lower six bits.
	 * we'll return 1s for the top two, but that's harmless.
	 */

        return ~((PINF & 0x03) | ((PINF & 0xF0) >> 2));
    }
}

/* Row pin configuration
 *
 * Teensy
 * row: 7   8   9   10  11  12  13
 * pin: B0  B1  B2  B3  D2  D3  C6
 *
 * MCP23018
 * row: 0   1   2   3   4   5   6
 * pin: A0  A1  A2  A3  A4  A5  A6
 */
static void unselect_rows(void)
{
    // no need to unselect on mcp23018, because the select step sets all
    // the other row bits high, and it's not changing to a different
    // direction

    // unselect on teensy
    // Hi-Z(DDR:0, PORT:0) to unselect
    DDRB  &= ~(1<<0 | 1<<1 | 1<<2 | 1<<3);
    PORTB &= ~(1<<0 | 1<<1 | 1<<2 | 1<<3);
    DDRD  &= ~(1<<2 | 1<<3);
    PORTD &= ~(1<<2 | 1<<3);
    DDRC  &= ~(1<<6);
    PORTC &= ~(1<<6);
}

static void select_row(uint8_t row)
{
    if (row < 7) {
        // select on mcp23018
        if (mcp23018_status) { // if there was an error
            // do nothing
        } else {
            // set active row low  : 0
            // set other rows hi-Z : 1
            mcp23018_status = i2c_start(I2C_ADDR_WRITE);        if (mcp23018_status) goto out;
            mcp23018_status = i2c_write(GPIOA);                 if (mcp23018_status) goto out;
            mcp23018_status = i2c_write(0xFF & ~(1<<row));      if (mcp23018_status) goto out;
        out:
            i2c_stop();
        }
    } else {
        // select on teensy
        // Output low(DDR:1, PORT:0) to select
        switch (row) {
            case 7:
                DDRB  |= (1<<0);
                PORTB &= ~(1<<0);
                break;
            case 8:
                DDRB  |= (1<<1);
                PORTB &= ~(1<<1);
                break;
            case 9:
                DDRB  |= (1<<2);
                PORTB &= ~(1<<2);
                break;
            case 10:
                DDRB  |= (1<<3);
                PORTB &= ~(1<<3);
                break;
            case 11:
                DDRD  |= (1<<2);
                PORTD &= ~(1<<3);
                break;
            case 12:
                DDRD  |= (1<<3);
                PORTD &= ~(1<<3);
                break;
            case 13:
                DDRC  |= (1<<6);
                PORTC &= ~(1<<6);
                break;
        }
    }
}