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)
62 // initialize row and col
66 // initialize matrix state: all keys off
67 for (uint8_t i
=0; i
< MATRIX_ROWS
; i
++) {
69 matrix_debouncing
[i
] = 0;
73 uint8_t matrix_scan(void)
75 for (uint8_t i
= 0; i
< MATRIX_ROWS
; i
++) {
77 _delay_us(30); // without this wait read unstable value.
78 matrix_row_t cols
= read_cols();
79 if (matrix_debouncing
[i
] != cols
) {
80 matrix_debouncing
[i
] = cols
;
82 debug("bounce!: "); debug_hex(debouncing
); debug("\n");
84 debouncing
= DEBOUNCE
;
93 for (uint8_t i
= 0; i
< MATRIX_ROWS
; i
++) {
94 matrix
[i
] = matrix_debouncing
[i
];
102 bool matrix_is_modified(void)
104 if (debouncing
) return false;
109 bool matrix_is_on(uint8_t row
, uint8_t col
)
111 return (matrix
[row
] & ((matrix_row_t
)1<<col
));
115 matrix_row_t
matrix_get_row(uint8_t row
)
120 void matrix_print(void)
122 print("\nr/c 0123456789ABCDEF\n");
123 for (uint8_t row
= 0; row
< MATRIX_ROWS
; row
++) {
124 phex(row
); print(": ");
125 pbin_reverse16(matrix_get_row(row
));
130 uint8_t matrix_key_count(void)
133 for (uint8_t i
= 0; i
< MATRIX_ROWS
; i
++) {
134 count
+= bitpop16(matrix
[i
]);
139 /* Column pin configuration
143 static void init_cols(void)
145 // Input with pull-up(DDR:0, PORT:1)
150 static matrix_row_t
read_cols(void)
152 return (PIND
&(1<<0) ? 0 : (1<<0));
155 /* Row pin configuration
159 static void unselect_rows(void)
161 // Hi-Z(DDR:0, PORT:0) to unselect
163 PORTD
&= ~0b00000010;
166 static void select_row(uint8_t row
)
168 // Output low(DDR:1, PORT:0) to select