2 Copyright 2011 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 #ifdef MATRIX_HAS_GHOST
41 static bool matrix_has_ghost_in_row(uint8_t row
);
43 static matrix_row_t
read_cols(void);
44 static void unselect_rows(void);
45 static void select_row(uint8_t row
);
49 uint8_t matrix_rows(void)
55 uint8_t matrix_cols(void)
60 void matrix_init(void)
62 // initialize row and col
64 // Input with pull-up(DDR:0, PORT:1)
68 // initialize matrix state: all keys off
69 for (uint8_t i
=0; i
< MATRIX_ROWS
; i
++) {
71 matrix_debouncing
[i
] = 0;
75 uint8_t matrix_scan(void)
77 for (uint8_t i
= 0; i
< MATRIX_ROWS
; i
++) {
79 _delay_us(30); // without this wait read unstable value.
80 matrix_row_t cols
= read_cols();
81 if (matrix_debouncing
[i
] != cols
) {
82 matrix_debouncing
[i
] = cols
;
84 debug("bounce!: "); debug_hex(debouncing
); debug("\n");
86 debouncing
= DEBOUNCE
;
95 for (uint8_t i
= 0; i
< MATRIX_ROWS
; i
++) {
96 matrix
[i
] = matrix_debouncing
[i
];
105 bool matrix_is_modified(void)
107 if (debouncing
) return false;
112 bool matrix_is_on(uint8_t row
, uint8_t col
)
114 return (matrix
[row
] & ((matrix_row_t
)1<<col
));
118 matrix_row_t
matrix_get_row(uint8_t row
)
123 void matrix_print(void)
125 print("\nr/c 01234567\n");
126 for (uint8_t row
= 0; row
< matrix_rows(); row
++) {
127 phex(row
); print(": ");
128 pbin_reverse(matrix_get_row(row
));
129 #ifdef MATRIX_HAS_GHOST
130 if (matrix_has_ghost_in_row(row
)) {
138 #ifdef MATRIX_HAS_GHOST
140 static bool matrix_has_ghost_in_row(uint8_t row
)
142 // no ghost exists in case less than 2 keys on
143 if (((matrix
[row
] - 1) & matrix
[row
]) == 0)
146 // ghost exists in case same state as other row
147 for (uint8_t i
=0; i
< MATRIX_ROWS
; i
++) {
148 if (i
!= row
&& (matrix
[i
] & matrix
[row
]))
156 static matrix_row_t
read_cols(void)
162 static void unselect_rows(void)
164 // Hi-Z(DDR:0, PORT:0) to unselect
165 DDRC
&= ~0b01000000; // PC: 6
166 PORTC
&= ~0b01000000;
167 DDRD
&= ~0b11100111; // PD: 7,6,5,2,1,0
168 PORTD
&= ~0b11100111;
169 DDRF
&= ~0b11000000; // PF: 7,6
170 PORTF
&= ~0b11000000;
174 static void select_row(uint8_t row
)
176 // Output low(DDR:1, PORT:0) to select
177 // row: 0 1 2 3 4 5 6 7 8
178 // pin: PD0, PD5, PD7, PF6, PD6, PD1, PD2, PC6, PF7