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/*
Copyright 2017 Alex Ong<the.onga@gmail.com>
Copyright 2021 Simon Arlott
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/>.
*/
/*
Basic global debounce algorithm. Used in 99% of keyboards at time of implementation
When no state changes have occured for DEBOUNCE milliseconds, we push the state.
*/
#include "debounce.h"
#include "timer.h"
#include <string.h>
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
// Maximum debounce: 255ms
#if DEBOUNCE > UINT8_MAX
# undef DEBOUNCE
# define DEBOUNCE UINT8_MAX
#endif
#if DEBOUNCE > 0
static bool debouncing = false;
static fast_timer_t debouncing_time;
void debounce_init(uint8_t num_rows) {}
bool debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
bool cooked_changed = false;
if (changed) {
debouncing = true;
debouncing_time = timer_read_fast();
} else if (debouncing && timer_elapsed_fast(debouncing_time) >= DEBOUNCE) {
size_t matrix_size = num_rows * sizeof(matrix_row_t);
if (memcmp(cooked, raw, matrix_size) != 0) {
memcpy(cooked, raw, matrix_size);
cooked_changed = true;
}
debouncing = false;
}
return cooked_changed;
}
void debounce_free(void) {}
#else // no debouncing.
# include "none.c"
#endif
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