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
|
/*
* Copyright 2020 Richard Titmuss (richard.titmuss@gmail.com)
* Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
*
* 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 QMK_KEYBOARD_H
#include "mcp23018.h"
#define SPLIT_MATRIX_COLS (MATRIX_COLS / 2)
#define SECONDARY_ROW_OFFSET (MATRIX_ROWS / 2)
typedef uint16_t mcp23018_pin_t;
static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
static const pin_t col_pins[SPLIT_MATRIX_COLS] = MATRIX_COL_PINS;
static const mcp23018_pin_t secondary_row_pins[MATRIX_ROWS] = SECONDARY_ROW_PINS;
static const mcp23018_pin_t secondary_col_pins[SPLIT_MATRIX_COLS] = SECONDARY_COL_PINS;
static void select_row(uint8_t row) {
setPinOutput(row_pins[row]);
writePinLow(row_pins[row]);
}
static void unselect_row(uint8_t row) { setPinInputHigh(row_pins[row]); }
static void unselect_rows(void) {
for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
setPinInputHigh(row_pins[x]);
}
}
static void select_secondary_row(uint8_t row) {
uint8_t gpioa = 0xFF & ~secondary_row_pins[row];
mcp23018_writeReg(GPIOA, &gpioa, 1);
}
static void init_pins(void) {
unselect_rows();
for (uint8_t x = 0; x < SPLIT_MATRIX_COLS; x++) {
setPinInputHigh(col_pins[x]);
}
}
static matrix_row_t read_cols(void) {
matrix_row_t state = 0;
// For each col...
for (uint8_t col_index = 0; col_index < SPLIT_MATRIX_COLS; col_index++) {
// Select the col pin to read (active low)
uint8_t pin_state = readPin(col_pins[col_index]);
// Populate the matrix row with the state of the col pin
state |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
}
return state;
}
static matrix_row_t read_secondary_cols(void) {
matrix_row_t state = 0;
uint8_t mcp23018_pin_state[2];
if (mcp23018_readReg(GPIOA, mcp23018_pin_state, 2)) {
return 0;
}
uint16_t pins = mcp23018_pin_state[0] | (mcp23018_pin_state[1] << 8);
for (uint8_t col_index = 0; col_index < SPLIT_MATRIX_COLS; col_index++) {
uint16_t pin_state = pins & (secondary_col_pins[col_index]);
state |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
}
return state;
}
static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
matrix_row_t last_row_value = current_matrix[current_row];
select_row(current_row);
select_secondary_row(current_row);
current_matrix[current_row] = read_cols() | (read_secondary_cols() << 6);
unselect_row(current_row);
return (last_row_value != current_matrix[current_row]);
}
void matrix_init_custom(void) { init_pins(); }
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
bool changed = false;
for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
changed |= read_cols_on_row(current_matrix, current_row);
}
return changed;
}
|
