4bd5c033c3
* Refactor debounce counters with direct indexing * Refactor code to use array indexing for debounce_counters * Use global MATRIX_ROW_SHIFTER macro * Refactor debounce algorithm with static allocation * Converted arrays to static allocation * Standardised use of MATRIX_ROWS_PER_HAND for array sizing * Added Doxygen comments for primary debounce functions * Removed debounce_free() * Rewrite sym_defer_pr * Modernise code using sym_defer_pk as template * Format consistency with other current algorithms * Use shorter SPDX-License-Identifier * Remove ChibiOS core memory manager guard * Keep type definition within DEBOUNCE guard * Add change log * Minor optimisation refactor * Pre-calculate row_offset in per-key matrix loops * Add inline compiler hints * Improve readability with blank lines * Limit elapsed time to the maximum debounce value * Apply suggestions from code review Declare counters with "DEBOUNCE_ELAPSED" Co-authored-by: Joel Challis <git@zvecr.com> * Update change log to new breaking change date --------- Co-authored-by: Joel Challis <git@zvecr.com>
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
// Copyright 2017 Alex Ong<the.onga@gmail.com>
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// Copyright 2021 Simon Arlott
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// SPDX-License-Identifier: GPL-2.0-or-later
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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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#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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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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static fast_timer_t debouncing_time;
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static bool debouncing = false;
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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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#else // no debouncing.
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# include "none.c"
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#endif
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