142 lines
4.5 KiB
C
142 lines
4.5 KiB
C
/*
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Copyright 2019 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 per-row algorithm. Uses an 8-bit counter per row.
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After pressing a key, it immediately changes state, and sets a counter.
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No further inputs are accepted until DEBOUNCE milliseconds have occurred.
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*/
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#include "debounce.h"
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#include "timer.h"
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#include <stdlib.h>
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#ifdef PROTOCOL_CHIBIOS
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# if CH_CFG_USE_MEMCORE == FALSE
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# error ChibiOS is configured without a memory allocator. Your keyboard may have set `#define CH_CFG_USE_MEMCORE FALSE`, which is incompatible with this debounce algorithm.
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# endif
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#endif
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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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typedef uint8_t debounce_counter_t;
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#if DEBOUNCE > 0
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static bool matrix_need_update;
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static debounce_counter_t *debounce_counters;
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static fast_timer_t last_time;
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static bool counters_need_update;
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static bool cooked_changed;
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# define DEBOUNCE_ELAPSED 0
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static void update_debounce_counters(uint8_t num_rows, uint8_t elapsed_time);
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static void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows);
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// we use num_rows rather than MATRIX_ROWS to support split keyboards
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void debounce_init(uint8_t num_rows) {
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debounce_counters = (debounce_counter_t *)malloc(num_rows * sizeof(debounce_counter_t));
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for (uint8_t r = 0; r < num_rows; r++) {
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debounce_counters[r] = DEBOUNCE_ELAPSED;
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}
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}
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void debounce_free(void) {
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free(debounce_counters);
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debounce_counters = NULL;
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}
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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 updated_last = false;
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cooked_changed = false;
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if (counters_need_update) {
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fast_timer_t now = timer_read_fast();
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fast_timer_t elapsed_time = TIMER_DIFF_FAST(now, last_time);
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last_time = now;
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updated_last = true;
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if (elapsed_time > UINT8_MAX) {
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elapsed_time = UINT8_MAX;
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}
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if (elapsed_time > 0) {
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update_debounce_counters(num_rows, elapsed_time);
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}
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}
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if (changed || matrix_need_update) {
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if (!updated_last) {
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last_time = timer_read_fast();
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}
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transfer_matrix_values(raw, cooked, num_rows);
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}
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return cooked_changed;
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}
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// If the current time is > debounce counter, set the counter to enable input.
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static void update_debounce_counters(uint8_t num_rows, uint8_t elapsed_time) {
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counters_need_update = false;
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matrix_need_update = false;
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debounce_counter_t *debounce_pointer = debounce_counters;
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for (uint8_t row = 0; row < num_rows; row++) {
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if (*debounce_pointer != DEBOUNCE_ELAPSED) {
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if (*debounce_pointer <= elapsed_time) {
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*debounce_pointer = DEBOUNCE_ELAPSED;
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matrix_need_update = true;
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} else {
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*debounce_pointer -= elapsed_time;
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counters_need_update = true;
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}
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}
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debounce_pointer++;
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}
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}
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// upload from raw_matrix to final matrix;
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static void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows) {
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matrix_need_update = false;
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debounce_counter_t *debounce_pointer = debounce_counters;
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for (uint8_t row = 0; row < num_rows; row++) {
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matrix_row_t existing_row = cooked[row];
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matrix_row_t raw_row = raw[row];
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// determine new value basd on debounce pointer + raw value
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if (existing_row != raw_row) {
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if (*debounce_pointer == DEBOUNCE_ELAPSED) {
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*debounce_pointer = DEBOUNCE;
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cooked_changed |= cooked[row] ^ raw_row;
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cooked[row] = raw_row;
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counters_need_update = true;
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}
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}
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debounce_pointer++;
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}
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}
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#else
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# include "none.c"
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#endif
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