61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/*
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Copyright 2017 Alex Ong<the.onga@gmail.com>
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Copyright 2021 Simon Arlott
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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Basic global debounce algorithm. Used in 99% of keyboards at time of implementation
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When no state changes have occured for DEBOUNCE milliseconds, we push the state.
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*/
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#include "debounce.h"
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#include "timer.h"
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#include <string.h>
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#ifndef DEBOUNCE
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# define DEBOUNCE 5
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#endif
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// Maximum debounce: 255ms
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#if DEBOUNCE > UINT8_MAX
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# undef DEBOUNCE
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# define DEBOUNCE UINT8_MAX
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#endif
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#if DEBOUNCE > 0
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static bool debouncing = false;
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static fast_timer_t debouncing_time;
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void debounce_init(uint8_t num_rows) {}
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bool debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
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bool cooked_changed = false;
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if (changed) {
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debouncing = true;
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debouncing_time = timer_read_fast();
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} else if (debouncing && timer_elapsed_fast(debouncing_time) >= DEBOUNCE) {
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size_t matrix_size = num_rows * sizeof(matrix_row_t);
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if (memcmp(cooked, raw, matrix_size) != 0) {
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memcpy(cooked, raw, matrix_size);
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cooked_changed = true;
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}
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debouncing = false;
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}
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return cooked_changed;
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}
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void debounce_free(void) {}
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#else // no debouncing.
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# include "none.c"
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#endif
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