29df868321955daf5327eef9f61855011c35d05e
[tmk_keyboard.git] / keyboard / onekey / matrix.c
1 /*
2 Copyright 2012 Jun Wako <wakojun@gmail.com>
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 2 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 /*
19 * scan matrix
20 */
21 #include <stdint.h>
22 #include <stdbool.h>
23 #include <avr/io.h>
24 #include <util/delay.h>
25 #include "print.h"
26 #include "debug.h"
27 #include "util.h"
28 #include "matrix.h"
29
30
31 #ifndef DEBOUNCE
32 # define DEBOUNCE 5
33 #endif
34 static uint8_t debouncing = DEBOUNCE;
35
36 /* matrix state(1:on, 0:off) */
37 static matrix_row_t matrix[MATRIX_ROWS];
38 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
39
40 static matrix_row_t read_cols(void);
41 static void init_cols(void);
42 static void unselect_rows(void);
43 static void select_row(uint8_t row);
44
45
46 inline
47 uint8_t matrix_rows(void)
48 {
49 return MATRIX_ROWS;
50 }
51
52 inline
53 uint8_t matrix_cols(void)
54 {
55 return MATRIX_COLS;
56 }
57
58 void matrix_init(void)
59 {
60 debug_enable = true;
61 debug_matrix = true;
62 debug_mouse = true;
63 // initialize row and col
64 unselect_rows();
65 init_cols();
66
67 // initialize matrix state: all keys off
68 for (uint8_t i=0; i < MATRIX_ROWS; i++) {
69 matrix[i] = 0;
70 matrix_debouncing[i] = 0;
71 }
72 }
73
74 uint8_t matrix_scan(void)
75 {
76 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
77 select_row(i);
78 _delay_us(30); // without this wait read unstable value.
79 matrix_row_t cols = read_cols();
80 if (matrix_debouncing[i] != cols) {
81 matrix_debouncing[i] = cols;
82 if (debouncing) {
83 debug("bounce!: "); debug_hex(debouncing); debug("\n");
84 }
85 debouncing = DEBOUNCE;
86 }
87 unselect_rows();
88 }
89
90 if (debouncing) {
91 if (--debouncing) {
92 _delay_ms(1);
93 } else {
94 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
95 matrix[i] = matrix_debouncing[i];
96 }
97 }
98 }
99
100 return 1;
101 }
102
103 bool matrix_is_modified(void)
104 {
105 if (debouncing) return false;
106 return true;
107 }
108
109 inline
110 bool matrix_is_on(uint8_t row, uint8_t col)
111 {
112 return (matrix[row] & ((matrix_row_t)1<<col));
113 }
114
115 inline
116 matrix_row_t matrix_get_row(uint8_t row)
117 {
118 return matrix[row];
119 }
120
121 void matrix_print(void)
122 {
123 print("\nr/c 0123456789ABCDEF\n");
124 for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
125 phex(row); print(": ");
126 pbin_reverse16(matrix_get_row(row));
127 print("\n");
128 }
129 }
130
131 uint8_t matrix_key_count(void)
132 {
133 uint8_t count = 0;
134 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
135 count += bitpop16(matrix[i]);
136 }
137 return count;
138 }
139
140 /* Column pin configuration
141 * col: 0
142 * pin: B0
143 */
144 static void init_cols(void)
145 {
146 // Input with pull-up(DDR:0, PORT:1)
147 DDRB &= ~(1<<0);
148 PORTB |= (1<<0);
149 }
150
151 static matrix_row_t read_cols(void)
152 {
153 return (PINB&(1<<0) ? 0 : (1<<0));
154 }
155
156 /* Row pin configuration
157 * row: 0
158 * pin: B1
159 */
160 static void unselect_rows(void)
161 {
162 // Hi-Z(DDR:0, PORT:0) to unselect
163 DDRB &= ~0b00000010;
164 PORTB &= ~0b00000010;
165 }
166
167 static void select_row(uint8_t row)
168 {
169 // Output low(DDR:1, PORT:0) to select
170 switch (row) {
171 case 0:
172 DDRB |= (1<<1);
173 PORTB &= ~(1<<1);
174 break;
175 }
176 }
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