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);
47 uint8_t matrix_rows(void)
53 uint8_t matrix_cols(void)
58 void matrix_init(void)
63 // initialize row and col
67 // initialize matrix state: all keys off
68 for (uint8_t i=0; i < MATRIX_ROWS; i++) {
70 matrix_debouncing[i] = 0;
74 uint8_t matrix_scan(void)
76 for (uint8_t i = 0; i < MATRIX_ROWS; 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;
83 debug("bounce!: "); debug_hex(debouncing); debug("\n");
85 debouncing = DEBOUNCE;
94 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
95 matrix[i] = matrix_debouncing[i];
103 bool matrix_is_modified(void)
105 if (debouncing) return false;
110 bool matrix_is_on(uint8_t row, uint8_t col)
112 return (matrix[row] & ((matrix_row_t)1<<col));
116 matrix_row_t matrix_get_row(uint8_t row)
121 void matrix_print(void)
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));
131 uint8_t matrix_key_count(void)
134 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
135 count += bitpop16(matrix[i]);
140 /* Column pin configuration
144 static void init_cols(void)
146 // Input with pull-up(DDR:0, PORT:1)
151 static matrix_row_t read_cols(void)
153 return (PINB&(1<<0) ? 0 : (1<<0));
156 /* Row pin configuration
160 static void unselect_rows(void)
162 // Hi-Z(DDR:0, PORT:0) to unselect
164 PORTB &= ~0b00000010;
167 static void select_row(uint8_t row)
169 // Output low(DDR:1, PORT:0) to select