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>
34 static uint8_t debouncing = DEBOUNCE;
36 /* matrix state(1:on, 0:off) */
37 static matrix_row_t matrix[MATRIX_ROWS];
38 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
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);
46 void matrix_init(void)
48 // initialize row and col
52 // initialize matrix state: all keys off
53 for (uint8_t i=0; i < MATRIX_ROWS; i++) {
55 matrix_debouncing[i] = 0;
59 uint8_t matrix_scan(void)
61 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
63 _delay_us(30); // without this wait read unstable value.
64 matrix_row_t cols = read_cols();
65 if (matrix_debouncing[i] != cols) {
66 matrix_debouncing[i] = cols;
68 debug("bounce!: "); debug_hex(debouncing); debug("\n");
70 debouncing = DEBOUNCE;
79 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
80 matrix[i] = matrix_debouncing[i];
89 matrix_row_t matrix_get_row(uint8_t row)
94 /* Column pin configuration
95 * col: 0 1 2 3 4 5 6 7 8 9 10 11 12 13
96 * pin: F0 F1 E6 C7 C6 B6 D4 B1 B0 B5 B4 D7 D6 B3 (Rev.A)
99 static void init_cols(void)
101 // Input with pull-up(DDR:0, PORT:1)
102 DDRF &= ~(1<<0 | 1<<1);
103 PORTF |= (1<<0 | 1<<1);
106 DDRD &= ~(1<<7 | 1<<6 | 1<<4);
107 PORTD |= (1<<7 | 1<<6 | 1<<4);
108 DDRC &= ~(1<<7 | 1<<6);
109 PORTC |= (1<<7 | 1<<6);
110 DDRB &= ~(1<<7 | 1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
111 PORTB |= (1<<7 | 1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
114 static matrix_row_t read_cols(void)
116 return (PINF&(1<<0) ? 0 : (1<<0)) |
117 (PINF&(1<<1) ? 0 : (1<<1)) |
118 (PINE&(1<<6) ? 0 : (1<<2)) |
119 (PINC&(1<<7) ? 0 : (1<<3)) |
120 (PINC&(1<<6) ? 0 : (1<<4)) |
121 (PINB&(1<<6) ? 0 : (1<<5)) |
122 (PIND&(1<<4) ? 0 : (1<<6)) |
123 (PINB&(1<<1) ? 0 : (1<<7)) |
124 ((PINB&(1<<0) && PINB&(1<<7)) ? 0 : (1<<8)) | // Rev.A and B
125 (PINB&(1<<5) ? 0 : (1<<9)) |
126 (PINB&(1<<4) ? 0 : (1<<10)) |
127 (PIND&(1<<7) ? 0 : (1<<11)) |
128 (PIND&(1<<6) ? 0 : (1<<12)) |
129 (PINB&(1<<3) ? 0 : (1<<13));
132 /* Row pin configuration
134 * pin: D0 D1 D2 D3 D5
136 static void unselect_rows(void)
138 // Hi-Z(DDR:0, PORT:0) to unselect
140 PORTD &= ~0b00101111;
143 static void select_row(uint8_t row)
145 // Output low(DDR:1, PORT:0) to select