2 Copyright 2012 Jun Wako <wakojun@gmail.com>
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.
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.
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/>.
24 #include <util/delay.h>
35 static bool debouncing = false;
36 static uint16_t debouncing_time = 0;
39 /* matrix state(1:on, 0:off) */
40 static matrix_row_t matrix[MATRIX_ROWS];
41 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
43 static matrix_row_t read_cols(void);
44 static void init_cols(void);
45 static void unselect_rows(void);
46 static void select_row(uint8_t row);
49 void matrix_init(void)
51 // initialize row and col
55 // initialize matrix state: all keys off
56 for (uint8_t i=0; i < MATRIX_ROWS; i++) {
58 matrix_debouncing[i] = 0;
62 uint8_t matrix_scan(void)
64 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
66 _delay_us(1); // delay for settling
67 matrix_row_t cols = read_cols();
68 if (matrix_debouncing[i] != cols) {
70 dprintf("bounce: %d %d@%02X\n", timer_elapsed(debouncing_time), i, matrix_debouncing[i]^cols);
72 matrix_debouncing[i] = cols;
74 debouncing_time = timer_read();
79 if (debouncing && timer_elapsed(debouncing_time) >= DEBOUNCE) {
80 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
81 matrix[i] = matrix_debouncing[i];
90 matrix_row_t matrix_get_row(uint8_t row)
95 /* Column pin configuration
96 * col: 0 1 2 3 4 5 6 7 8 9 10 11 12 13
97 * pin: F0 F1 E6 C7 C6 B6 D4 B1 B0 B5 B4 D7 D6 B3 (Rev.A)
100 static void init_cols(void)
102 // Input with pull-up(DDR:0, PORT:1)
103 DDRF &= ~(1<<0 | 1<<1);
104 PORTF |= (1<<0 | 1<<1);
107 DDRD &= ~(1<<7 | 1<<6 | 1<<4);
108 PORTD |= (1<<7 | 1<<6 | 1<<4);
109 DDRC &= ~(1<<7 | 1<<6);
110 PORTC |= (1<<7 | 1<<6);
111 DDRB &= ~(1<<7 | 1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
112 PORTB |= (1<<7 | 1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
115 static matrix_row_t read_cols(void)
117 return (PINF&(1<<0) ? 0 : (1<<0)) |
118 (PINF&(1<<1) ? 0 : (1<<1)) |
119 (PINE&(1<<6) ? 0 : (1<<2)) |
120 (PINC&(1<<7) ? 0 : (1<<3)) |
121 (PINC&(1<<6) ? 0 : (1<<4)) |
122 (PINB&(1<<6) ? 0 : (1<<5)) |
123 (PIND&(1<<4) ? 0 : (1<<6)) |
124 (PINB&(1<<1) ? 0 : (1<<7)) |
125 ((PINB&(1<<0) && PINB&(1<<7)) ? 0 : (1<<8)) | // Rev.A and B
126 (PINB&(1<<5) ? 0 : (1<<9)) |
127 (PINB&(1<<4) ? 0 : (1<<10)) |
128 (PIND&(1<<7) ? 0 : (1<<11)) |
129 (PIND&(1<<6) ? 0 : (1<<12)) |
130 (PINB&(1<<3) ? 0 : (1<<13));
133 /* Row pin configuration
135 * pin: D0 D1 D2 D3 D5
137 static void unselect_rows(void)
139 // Hi-Z(DDR:0, PORT:0) to unselect
141 PORTD &= ~0b00101111;
144 static void select_row(uint8_t row)
146 // Output low(DDR:1, PORT:0) to select