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
|
#include <stdbool.h>
#include "action.h"
#include "i2cmaster.h"
#include "expander.h"
#include "debug.h"
static uint8_t expander_status = 0;
static uint8_t expander_input = 0;
void expander_config(void);
uint8_t expander_write(uint8_t reg, uint8_t data);
uint8_t expander_read(uint8_t reg, uint8_t *data);
void expander_init(void)
{
i2c_init();
expander_scan();
}
void expander_scan(void)
{
dprintf("expander status: %d ... ", expander_status);
uint8_t ret = i2c_start(EXPANDER_ADDR | I2C_WRITE);
if (ret == 0) {
i2c_stop();
if (expander_status == 0) {
dprintf("attached\n");
expander_status = 1;
expander_config();
clear_keyboard();
}
}
else {
if (expander_status == 1) {
dprintf("detached\n");
expander_status = 0;
clear_keyboard();
}
}
dprintf("%d\n", expander_status);
}
void expander_read_cols(void)
{
expander_read(EXPANDER_REG_GPIOA, &expander_input);
}
uint8_t expander_get_col(uint8_t col)
{
if (col > 4) {
col++;
}
return expander_input & (1<<col) ? 1 : 0;
}
matrix_row_t expander_read_row(void)
{
expander_read_cols();
/* make cols */
matrix_row_t cols = 0;
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
if (expander_get_col(col)) {
cols |= (1UL << (MATRIX_COLS - 1 - col));
}
}
return cols;
}
void expander_unselect_rows(void)
{
expander_write(EXPANDER_REG_IODIRB, 0xFF);
}
void expander_select_row(uint8_t row)
{
expander_write(EXPANDER_REG_IODIRB, ~(1<<(row+1)));
}
void expander_config(void)
{
expander_write(EXPANDER_REG_IPOLA, 0xFF);
expander_write(EXPANDER_REG_GPPUA, 0xFF);
expander_write(EXPANDER_REG_IODIRB, 0xFF);
}
uint8_t expander_write(uint8_t reg, uint8_t data)
{
if (expander_status == 0) {
return 0;
}
uint8_t ret;
ret = i2c_start(EXPANDER_ADDR | I2C_WRITE);
if (ret) goto stop;
ret = i2c_write(reg);
if (ret) goto stop;
ret = i2c_write(data);
stop:
i2c_stop();
return ret;
}
uint8_t expander_read(uint8_t reg, uint8_t *data)
{
if (expander_status == 0) {
return 0;
}
uint8_t ret;
ret = i2c_start(EXPANDER_ADDR | I2C_WRITE);
if (ret) goto stop;
ret = i2c_write(reg);
if (ret) goto stop;
ret = i2c_rep_start(EXPANDER_ADDR | I2C_READ);
if (ret) goto stop;
*data = i2c_readNak();
stop:
i2c_stop();
return ret;
}
|
