summaryrefslogtreecommitdiff
path: root/keyboards/moon/matrix.c
blob: 24b4d49560fd3c12cfcb13d2eddfe06e3f1ae0c7 (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
/*
Copyright 2012-2019 Jun Wako, Jack Humbert, Yiancar, Mathias Andersson <wraul@dbox.se>

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/>.
*/
#include <stdint.h>
#include <stdbool.h>
#include "wait.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#include "debounce.h"
#include "quantum.h"
#include "pca9555.h"

/*
 *       IC1 (PCA9555)                  IC2 (PCA9555)
 *       ,----------.                   ,----------.
 * SDA --| SDA  P00 |-- P1        SDA --| SDA  P00 |-- P17
 * SCL --| SCL  P01 |-- P2        SCL --| SCL  P01 |-- P18
 * INT --| INT  P02 |-- P3        INT --| INT  P02 |-- P19
 *       |      P03 |-- P4              |      P03 |-- P20
 * GND --| A0   P04 |-- P5        VCC --| A0   P04 |-- P21
 * SJ1 --| A1   P05 |-- P6        SJ1 --| A1   P05 |-- P22
 * GND --| A2   P06 |-- P7        GND --| A2   P06 |-- P23
 *       |      P07 |-- P8              |      P07 |-- P24
 *       |          |                   |          |
 *       |      P10 |-- P9              |      P10 |-- P25
 *       |      P11 |-- P10             |      P11 |-- P26
 *       |      P12 |-- P11             |      P12 |-- P27
 *       |      P13 |-- P12             |      P13 |-- P28
 *       |      P14 |-- P13             |      P14 |-- P29
 *       |      P15 |-- P14             |      P15 |-- P30
 *       |      P16 |-- P15             |      P16 |-- P31
 *       |      P17 |-- P16             |      P17 |-- P32
 *       `----------'                   `----------'
 */

/*
 * | Row | Pin |   | Col | Pin |
 * | --- | --- |   | --- | --- |
 * | 0   | P1  |   | 0   | P25 |
 * | 1   | P2  |   | 1   | P26 |
 * | 2   | P3  |   | 2   | P27 |
 * | 3   | P4  |   | 3   | P28 |
 * | 4   | P5  |   | 4   | P29 |
 * | 5   | P6  |   | 5   | P30 |
 * | 6   | P7  |   | 6   | P20 |
 * | 7   | P8  |   | 7   | P21 |
 *                 | 8   | P22 |
 *                 | 9   | P23 |
 *                 | A   | P24 |
 */

// PCA9555 slave addresses
#define IC1 0x20
#define IC2 0x21

// PCA9555 column pin masks
#define PORT0_COLS_MASK 0b11111000
#define PORT1_COLS_MASK 0b00111111
#define COLS_MASK 0b0000011111111111

#if (MATRIX_COLS <= 8)
#  define print_matrix_header() print("\nr/c 01234567\n")
#  define print_matrix_row(row) print_bin_reverse8(matrix_get_row(row))
#  define matrix_bitpop(i) bitpop(matrix[i])
#  define ROW_SHIFTER ((uint8_t)1)
#elif (MATRIX_COLS <= 16)
#  define print_matrix_header() print("\nr/c 0123456789ABCDEF\n")
#  define print_matrix_row(row) print_bin_reverse16(matrix_get_row(row))
#  define matrix_bitpop(i) bitpop16(matrix[i])
#  define ROW_SHIFTER ((uint16_t)1)
#elif (MATRIX_COLS <= 32)
#  define print_matrix_header() print("\nr/c 0123456789ABCDEF0123456789ABCDEF\n")
#  define print_matrix_row(row) print_bin_reverse32(matrix_get_row(row))
#  define matrix_bitpop(i) bitpop32(matrix[i])
#  define ROW_SHIFTER ((uint32_t)1)
#endif

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

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

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

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

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

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

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

inline uint8_t matrix_rows(void) { return MATRIX_ROWS; }

inline uint8_t matrix_cols(void) { return MATRIX_COLS; }

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_matrix_header();

  for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
    print_hex8(row);
    print(": ");
    print_matrix_row(row);
    print("\n");
  }
}

uint8_t matrix_key_count(void) {
  uint8_t count = 0;
  for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
    count += matrix_bitpop(i);
  }
  return count;
}

static void init_i2c(void) {
  pca9555_init(IC1);
  pca9555_init(IC2);
}

static void init_pins(void) {
  // init cols - IC2 port0 & IC2 port1 input
  pca9555_set_config(IC2, PCA9555_PORT0, ALL_INPUT);
  pca9555_set_config(IC2, PCA9555_PORT1, ALL_INPUT);

  // init rows - IC1 port0 output
  pca9555_set_config(IC1, PCA9555_PORT0, ALL_OUTPUT);
  pca9555_set_output(IC1, PCA9555_PORT0, ALL_HIGH);
}

static void select_row(uint8_t row) {
  // All rows are on the same IC and port
  uint8_t mask = 1 << row;

  // set active row low  : 0
  // set other rows hi-Z : 1
  pca9555_set_output(IC1, PCA9555_PORT0, ALL_HIGH & (~mask));
}

static uint16_t read_cols(void) {
  uint16_t state_1 = pca9555_readPins(IC2, PCA9555_PORT0);
  uint16_t state_2 = pca9555_readPins(IC2, PCA9555_PORT1);

  uint16_t state = ((state_1 & PORT0_COLS_MASK) << 3) | ((state_2 & PORT1_COLS_MASK));

  // A low pin indicates an active column
  return (~state) & COLS_MASK;
}

static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
  // Store last value of row prior to reading
  matrix_row_t last_row_value = current_matrix[current_row];

  // Clear data in matrix row
  current_matrix[current_row] = 0;

  // Select row and wait for row selecton to stabilize
  select_row(current_row);
  wait_us(30);

  current_matrix[current_row] |= read_cols();

  // No need to unselect as `select_row` sets all the pins.

  return (last_row_value != current_matrix[current_row]);
}

void matrix_init(void) {
  // initialize i2c
  init_i2c();

  // initialize key pins
  init_pins();

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

  debounce_init(MATRIX_ROWS);

  matrix_init_quantum();
}

uint8_t matrix_scan(void) {
  bool changed = false;

  for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
    changed |= read_cols_on_row(raw_matrix, current_row);
  }

  debounce(raw_matrix, matrix, MATRIX_ROWS, changed);

  matrix_scan_quantum();

  return (uint8_t)changed;
}