blob: beaa54c400af53d020d382b665a0ddaa8d9a5678 (
plain) (
blame)
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
|
/*
Copyright 2017 Luiz Ribeiro <luizribeiro@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/>.
*/
#include <avr/io.h>
#include <util/delay.h>
#include "matrix.h"
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
static uint8_t debouncing = DEBOUNCE;
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
void matrix_init(void) {
// all outputs for rows high
DDRB = 0xFF;
PORTB = 0xFF;
// all inputs for columns
DDRA = 0x00;
DDRC &= ~(0x111111<<2);
DDRD &= ~(1<<PIND7);
// all columns are pulled-up
PORTA = 0xFF;
PORTC |= (0b111111<<2);
PORTD |= (1<<PIND7);
// initialize matrix state: all keys off
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
matrix[row] = 0x00;
matrix_debouncing[row] = 0x00;
}
}
void matrix_set_row_status(uint8_t row) {
DDRB = (1 << row);
PORTB = ~(1 << row);
}
uint8_t bit_reverse(uint8_t x) {
x = ((x >> 1) & 0x55) | ((x << 1) & 0xaa);
x = ((x >> 2) & 0x33) | ((x << 2) & 0xcc);
x = ((x >> 4) & 0x0f) | ((x << 4) & 0xf0);
return x;
}
uint8_t matrix_scan(void) {
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
matrix_set_row_status(row);
_delay_us(5);
matrix_row_t cols = (
// cols 0..7, PORTA 0 -> 7
(~PINA) & 0xFF
) | (
// cols 8..13, PORTC 7 -> 0
bit_reverse((~PINC) & 0xFF) << 8
) | (
// col 14, PORTD 7
((~PIND) & (1 << PIND7)) << 7
);
if (matrix_debouncing[row] != cols) {
matrix_debouncing[row] = cols;
debouncing = DEBOUNCE;
}
}
if (debouncing) {
if (--debouncing) {
_delay_ms(1);
} else {
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = matrix_debouncing[i];
}
}
}
return 1;
}
inline matrix_row_t matrix_get_row(uint8_t row) {
return matrix[row];
}
void matrix_print(void) {
}
|
