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/*
Copyright 2019 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 per-row algorithm. Uses an 8-bit counter per row.
After pressing a key, it immediately changes state, and sets a counter.
No further inputs are accepted until DEBOUNCE milliseconds have occurred.
*/
#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: 255ms
#if DEBOUNCE > UINT8_MAX
# undef DEBOUNCE
# define DEBOUNCE UINT8_MAX
#endif
typedef uint8_t debounce_counter_t;
#if DEBOUNCE > 0
static bool matrix_need_update;
static debounce_counter_t *debounce_counters;
static fast_timer_t last_time;
static bool counters_need_update;
static bool cooked_changed;
# define DEBOUNCE_ELAPSED 0
static void update_debounce_counters(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 = (debounce_counter_t *)malloc(num_rows * sizeof(debounce_counter_t));
for (uint8_t r = 0; r < num_rows; r++) {
debounce_counters[r] = 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(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;
}
// If the current time is > debounce counter, set the counter to enable input.
static void update_debounce_counters(uint8_t num_rows, uint8_t elapsed_time) {
counters_need_update = false;
matrix_need_update = false;
debounce_counter_t *debounce_pointer = debounce_counters;
for (uint8_t row = 0; row < num_rows; row++) {
if (*debounce_pointer != DEBOUNCE_ELAPSED) {
if (*debounce_pointer <= elapsed_time) {
*debounce_pointer = DEBOUNCE_ELAPSED;
matrix_need_update = true;
} else {
*debounce_pointer -= elapsed_time;
counters_need_update = true;
}
}
debounce_pointer++;
}
}
// upload from raw_matrix to final matrix;
static void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows) {
matrix_need_update = false;
debounce_counter_t *debounce_pointer = debounce_counters;
for (uint8_t row = 0; row < num_rows; row++) {
matrix_row_t existing_row = cooked[row];
matrix_row_t raw_row = raw[row];
// determine new value basd on debounce pointer + raw value
if (existing_row != raw_row) {
if (*debounce_pointer == DEBOUNCE_ELAPSED) {
*debounce_pointer = DEBOUNCE;
cooked_changed |= cooked[row] ^ raw_row;
cooked[row] = raw_row;
counters_need_update = true;
}
}
debounce_pointer++;
}
}
#else
# include "none.c"
#endif
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