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-rw-r--r--keyboards/mehkee96/matrix.c130
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diff --git a/keyboards/mehkee96/matrix.c b/keyboards/mehkee96/matrix.c
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1/*
2Copyright 2017 Luiz Ribeiro <luizribeiro@gmail.com>
3
4This program is free software: you can redistribute it and/or modify
5it under the terms of the GNU General Public License as published by
6the Free Software Foundation, either version 2 of the License, or
7(at your option) any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12GNU General Public License for more details.
13
14You should have received a copy of the GNU General Public License
15along with this program. If not, see <http://www.gnu.org/licenses/>.
16*/
17
18#include <avr/io.h>
19#include <util/delay.h>
20
21#include "matrix.h"
22
23#ifndef DEBOUNCE
24# define DEBOUNCE 5
25#endif
26
27static uint8_t debouncing = DEBOUNCE;
28
29static matrix_row_t matrix[MATRIX_ROWS];
30static matrix_row_t matrix_debouncing[MATRIX_ROWS];
31
32void matrix_set_row_status(uint8_t row);
33uint8_t bit_reverse(uint8_t x);
34
35__attribute__ ((weak))
36void matrix_init_kb(void) {
37 matrix_init_user();
38}
39
40__attribute__ ((weak))
41void matrix_scan_kb(void) {
42 matrix_scan_user();
43}
44
45__attribute__ ((weak))
46void matrix_init_user(void) {
47}
48
49__attribute__ ((weak))
50void matrix_scan_user(void) {
51}
52
53void matrix_init(void) {
54 // all outputs for rows high
55 DDRB = 0xFF;
56 PORTB = 0xFF;
57 // all inputs for columns
58 DDRA = 0x00;
59 DDRC &= ~(0x111111<<2);
60 DDRD &= ~(1<<PIND7);
61 // all columns are pulled-up
62 PORTA = 0xFF;
63 PORTC |= (0b111111<<2);
64 PORTD |= (1<<PIND7);
65
66 // initialize matrix state: all keys off
67 for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
68 matrix[row] = 0x00;
69 matrix_debouncing[row] = 0x00;
70 }
71
72 matrix_init_quantum();
73}
74
75uint8_t matrix_scan(void) {
76 for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
77 matrix_set_row_status(row);
78 _delay_us(5);
79
80 matrix_row_t cols = (
81 // cols 0..7, PORTA 0 -> 7
82 (~PINA) & 0xFF
83 ) | (
84 // cols 8..13, PORTC 7 -> 0
85 bit_reverse((~PINC) & 0xFF) << 8
86 ) | (
87 // col 14, PORTD 7
88 ((~PIND) & (1 << PIND7)) << 7
89 );
90
91 if (matrix_debouncing[row] != cols) {
92 matrix_debouncing[row] = cols;
93 debouncing = DEBOUNCE;
94 }
95 }
96
97 if (debouncing) {
98 if (--debouncing) {
99 _delay_ms(1);
100 } else {
101 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
102 matrix[i] = matrix_debouncing[i];
103 }
104 }
105 }
106
107 matrix_scan_quantum();
108
109 return 1;
110}
111
112// declarations
113void matrix_set_row_status(uint8_t row) {
114 DDRB = (1 << row);
115 PORTB = ~(1 << row);
116}
117
118uint8_t bit_reverse(uint8_t x) {
119 x = ((x >> 1) & 0x55) | ((x << 1) & 0xaa);
120 x = ((x >> 2) & 0x33) | ((x << 2) & 0xcc);
121 x = ((x >> 4) & 0x0f) | ((x << 4) & 0xf0);
122 return x;
123}
124
125inline matrix_row_t matrix_get_row(uint8_t row) {
126 return matrix[row];
127}
128
129void matrix_print(void) {
130}