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/*
* Copyright 2017 Alex Ong <the.onga@gmail.com>
* Copyright 2020 Andrei Purdea <andrei@purdea.ro>
* 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 symmetric per-key algorithm. Uses an 8-bit counter per key.
When no state changes have occured for DEBOUNCE milliseconds, we push the state.
*/
#include "debounce.h"
#include "timer.h"
#include <stdlib.h>
#ifdef PROTOCOL_CHIBIOS
# if CH_CFG_USE_MEMCORE == FALSE
# 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.
# endif
#endif
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
// Maximum debounce: 127ms
#if DEBOUNCE > 127
# undef DEBOUNCE
# define DEBOUNCE 127
#endif
#define ROW_SHIFTER ((matrix_row_t)1)
typedef struct {
bool pressed : 1;
uint8_t time : 7;
} debounce_counter_t;
#if DEBOUNCE > 0
static debounce_counter_t *debounce_counters;
static fast_timer_t last_time;
static bool counters_need_update;
static bool matrix_need_update;
static bool cooked_changed;
# define DEBOUNCE_ELAPSED 0
static void update_debounce_counters_and_transfer_if_expired(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t elapsed_time);
static void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows);
// we use num_rows rather than MATRIX_ROWS to support split keyboards
void debounce_init(uint8_t num_rows) {
debounce_counters = malloc(num_rows * MATRIX_COLS * sizeof(debounce_counter_t));
int i = 0;
for (uint8_t r = 0; r < num_rows; r++) {
for (uint8_t c = 0; c < MATRIX_COLS; c++) {
debounce_counters[i++].time = DEBOUNCE_ELAPSED;
}
}
}
void debounce_free(void) {
free(debounce_counters);
debounce_counters = NULL;
}
bool debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
bool updated_last = false;
cooked_changed = false;
if (counters_need_update) {
fast_timer_t now = timer_read_fast();
fast_timer_t elapsed_time = TIMER_DIFF_FAST(now, last_time);
last_time = now;
updated_last = true;
if (elapsed_time > UINT8_MAX) {
elapsed_time = UINT8_MAX;
}
if (elapsed_time > 0) {
update_debounce_counters_and_transfer_if_expired(raw, cooked, num_rows, elapsed_time);
}
}
if (changed || matrix_need_update) {
if (!updated_last) {
last_time = timer_read_fast();
}
transfer_matrix_values(raw, cooked, num_rows);
}
return cooked_changed;
}
static void update_debounce_counters_and_transfer_if_expired(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t elapsed_time) {
debounce_counter_t *debounce_pointer = debounce_counters;
counters_need_update = false;
matrix_need_update = false;
for (uint8_t row = 0; row < num_rows; row++) {
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
matrix_row_t col_mask = (ROW_SHIFTER << col);
if (debounce_pointer->time != DEBOUNCE_ELAPSED) {
if (debounce_pointer->time <= elapsed_time) {
debounce_pointer->time = DEBOUNCE_ELAPSED;
if (debounce_pointer->pressed) {
// key-down: eager
matrix_need_update = true;
} else {
// key-up: defer
matrix_row_t cooked_next = (cooked[row] & ~col_mask) | (raw[row] & col_mask);
cooked_changed |= cooked_next ^ cooked[row];
cooked[row] = cooked_next;
}
} else {
debounce_pointer->time -= elapsed_time;
counters_need_update = true;
}
}
debounce_pointer++;
}
}
}
static void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows) {
debounce_counter_t *debounce_pointer = debounce_counters;
matrix_need_update = false;
for (uint8_t row = 0; row < num_rows; row++) {
matrix_row_t delta = raw[row] ^ cooked[row];
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
matrix_row_t col_mask = (ROW_SHIFTER << col);
if (delta & col_mask) {
if (debounce_pointer->time == DEBOUNCE_ELAPSED) {
debounce_pointer->pressed = (raw[row] & col_mask);
debounce_pointer->time = DEBOUNCE;
counters_need_update = true;
if (debounce_pointer->pressed) {
// key-down: eager
cooked[row] ^= col_mask;
cooked_changed = true;
}
}
} else if (debounce_pointer->time != DEBOUNCE_ELAPSED) {
if (!debounce_pointer->pressed) {
// key-up: defer
debounce_pointer->time = DEBOUNCE_ELAPSED;
}
}
debounce_pointer++;
}
}
}
#else
# include "none.c"
#endif
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