+/*
+Copyright 2011 Jun Wako <wakojun@gmail.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
/*
* scan matrix
*/
#include <avr/io.h>
#include <util/delay.h>
#include "print.h"
+#include "debug.h"
#include "util.h"
#include "matrix.h"
#endif
+#ifndef DEBOUNCE
+# define DEBOUNCE 0
+#endif
+static uint8_t debouncing = DEBOUNCE;
+
// matrix state buffer(1:on, 0:off)
#if (MATRIX_COLS <= 8)
static uint8_t *matrix;
uint8_t matrix_scan(void)
{
- uint8_t *tmp;
-
- tmp = matrix_prev;
- matrix_prev = matrix;
- matrix = tmp;
+ if (!debouncing) {
+ uint8_t *tmp = matrix_prev;
+ matrix_prev = matrix;
+ matrix = tmp;
+ }
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
unselect_rows();
select_row(i);
_delay_us(30); // without this wait read unstable value.
- matrix[i] = ~read_col();
+ if (matrix[i] != (uint8_t)~read_col()) {
+ matrix[i] = (uint8_t)~read_col();
+ if (debouncing) {
+ debug("bounce!: "); debug_hex(debouncing); print("\n");
+ }
+ debouncing = DEBOUNCE;
+ }
}
unselect_rows();
+
+ if (debouncing) {
+ debouncing--;
+ }
+
return 1;
}
bool matrix_is_modified(void)
{
+ if (debouncing) return false;
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
- if (matrix[i] != matrix_prev[i])
+ if (matrix[i] != matrix_prev[i]) {
return true;
+ }
}
return false;
}