mirror of
https://github.com/Keychron/qmk_firmware.git
synced 2024-11-23 08:56:47 +06:00
f7ccbfcea8
* quantum/debounce: rename debouncing algorithms according to Issue 8763 This is the second attempt at implementation, with no ts_ and cy_ prefixes, since those will be implemented with macros. * Debouncing documentation: Refactor, add some generic info, and merge into a single document
112 lines
4.1 KiB
C
112 lines
4.1 KiB
C
/*
|
|
Copyright 2017 Alex Ong<the.onga@gmail.com>
|
|
Copyright 2020 Andrei Purdea<andrei@purdea.ro>
|
|
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 "matrix.h"
|
|
#include "timer.h"
|
|
#include "quantum.h"
|
|
#include <stdlib.h>
|
|
|
|
#ifndef DEBOUNCE
|
|
# define DEBOUNCE 5
|
|
#endif
|
|
|
|
#define ROW_SHIFTER ((matrix_row_t)1)
|
|
|
|
#define debounce_counter_t uint8_t
|
|
|
|
static debounce_counter_t *debounce_counters;
|
|
static bool counters_need_update;
|
|
|
|
#define DEBOUNCE_ELAPSED 251
|
|
#define MAX_DEBOUNCE (DEBOUNCE_ELAPSED - 1)
|
|
|
|
static uint8_t wrapping_timer_read(void) {
|
|
static uint16_t time = 0;
|
|
static uint8_t last_result = 0;
|
|
uint16_t new_time = timer_read();
|
|
uint16_t diff = new_time - time;
|
|
time = new_time;
|
|
last_result = (last_result + diff) % (MAX_DEBOUNCE + 1);
|
|
return last_result;
|
|
}
|
|
|
|
void update_debounce_counters_and_transfer_if_expired(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time);
|
|
void start_debounce_counters(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time);
|
|
|
|
// 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 * 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++] = DEBOUNCE_ELAPSED;
|
|
}
|
|
}
|
|
}
|
|
|
|
void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
|
|
uint8_t current_time = wrapping_timer_read();
|
|
if (counters_need_update) {
|
|
update_debounce_counters_and_transfer_if_expired(raw, cooked, num_rows, current_time);
|
|
}
|
|
|
|
if (changed) {
|
|
start_debounce_counters(raw, cooked, num_rows, current_time);
|
|
}
|
|
}
|
|
|
|
void update_debounce_counters_and_transfer_if_expired(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time) {
|
|
counters_need_update = false;
|
|
debounce_counter_t *debounce_pointer = debounce_counters;
|
|
for (uint8_t row = 0; row < num_rows; row++) {
|
|
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
|
|
if (*debounce_pointer != DEBOUNCE_ELAPSED) {
|
|
if (TIMER_DIFF(current_time, *debounce_pointer, MAX_DEBOUNCE) >= DEBOUNCE) {
|
|
*debounce_pointer = DEBOUNCE_ELAPSED;
|
|
cooked[row] = (cooked[row] & ~(ROW_SHIFTER << col)) | (raw[row] & (ROW_SHIFTER << col));
|
|
} else {
|
|
counters_need_update = true;
|
|
}
|
|
}
|
|
debounce_pointer++;
|
|
}
|
|
}
|
|
}
|
|
|
|
void start_debounce_counters(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time) {
|
|
debounce_counter_t *debounce_pointer = debounce_counters;
|
|
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++) {
|
|
if (delta & (ROW_SHIFTER << col)) {
|
|
if (*debounce_pointer == DEBOUNCE_ELAPSED) {
|
|
*debounce_pointer = current_time;
|
|
counters_need_update = true;
|
|
}
|
|
} else {
|
|
*debounce_pointer = DEBOUNCE_ELAPSED;
|
|
}
|
|
debounce_pointer++;
|
|
}
|
|
}
|
|
}
|
|
|
|
bool debounce_active(void) { return true; }
|