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
|
/*
Copyright 2012-2020 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 "atomic_util.h"
#include "wait.h"
#include "matrix.h"
#include "i2c_master.h"
#define PORT_EXPANDER_ADDRESS 0x20
static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
static inline void setPinOutput_writeLow(pin_t pin) {
ATOMIC_BLOCK_FORCEON {
setPinOutput(pin);
writePinLow(pin);
}
}
static inline void setPinOutput_writeHigh(pin_t pin) {
ATOMIC_BLOCK_FORCEON {
setPinOutput(pin);
writePinHigh(pin);
}
}
static inline void setPinInputHigh_atomic(pin_t pin) {
ATOMIC_BLOCK_FORCEON {
setPinInputHigh(pin);
}
}
static inline uint8_t readMatrixPin(pin_t pin) {
if (pin != NO_PIN) {
return (readPin(pin) == 0) ? 0 : 1;
} else {
return 1;
}
}
static bool select_row(uint8_t row) {
pin_t pin = row_pins[row];
if (pin != NO_PIN) {
setPinOutput_writeLow(pin);
return true;
}
return false;
}
static void unselect_row(uint8_t row) {
pin_t pin = row_pins[row];
if (pin != NO_PIN) {
setPinInputHigh_atomic(pin);
}
}
static void unselect_rows(void) {
for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
unselect_row(x);
}
}
static void init_pins(void) {
unselect_rows();
// Set I/O
uint8_t send_data = 0xFF;
i2c_write_register((PORT_EXPANDER_ADDRESS << 1), 0x00, &send_data, 1, 20);
// Set Pull-up
i2c_write_register((PORT_EXPANDER_ADDRESS << 1), 0x06, &send_data, 1, 20);
for (uint8_t x = 0; x < MATRIX_COLS; x++) {
if (col_pins[x] != NO_PIN) {
setPinInputHigh_atomic(col_pins[x]);
}
}
}
void matrix_init_custom(void) {
// TODO: initialize hardware here
// Initialize I2C
i2c_init();
// initialize key pins
init_pins();
wait_ms(50);
}
static bool matrix_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);
matrix_output_select_delay();
uint8_t port_expander_buffer;
i2c_read_register((PORT_EXPANDER_ADDRESS << 1), 0x09, &port_expander_buffer, 1, 20);
// For each col...
// matrix_row_t row_shifter = MATRIX_ROW_SHIFTER;
for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
uint8_t pin_state;
// Select the col pin to read (active low)
switch (col_index) {
case 6 :
pin_state = port_expander_buffer & (1 << 0);
break;
case 7 :
pin_state = port_expander_buffer & (1 << 1);
break;
case 8 :
pin_state = port_expander_buffer & (1 << 2);
break;
case 9 :
pin_state = port_expander_buffer & (1 << 3);
break;
case 10 :
pin_state = port_expander_buffer & (1 << 4);
break;
case 11 :
pin_state = port_expander_buffer & (1 << 5);
break;
case 12 :
pin_state = port_expander_buffer & (1 << 6);
break;
case 13 :
pin_state = port_expander_buffer & (1 << 7);
break;
default :
pin_state = readMatrixPin(col_pins[col_index]);
}
// Populate the matrix row with the state of the col pin
current_matrix[current_row] |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
}
// Unselect row
unselect_row(current_row);
return (last_row_value != current_matrix[current_row]);
}
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
bool matrix_has_changed = false;
// Set row, read cols
for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
matrix_has_changed |= matrix_read_cols_on_row(current_matrix, current_row);
}
return matrix_has_changed;
}
|
