111 lines
4 KiB
C
111 lines
4 KiB
C
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/*
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Copyright 2019 Alex Ong<the.onga@gmail.com>
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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 "matrix.h"
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#include "timer.h"
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#include "quantum.h"
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#include <stdlib.h>
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#ifndef DEBOUNCE
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# define DEBOUNCE 5
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#endif
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#define debounce_counter_t uint8_t
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static bool matrix_need_update;
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static debounce_counter_t *debounce_counters;
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static bool counters_need_update;
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#define DEBOUNCE_ELAPSED 251
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#define MAX_DEBOUNCE (DEBOUNCE_ELAPSED - 1)
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static uint8_t wrapping_timer_read(void) {
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static uint16_t time = 0;
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static uint8_t last_result = 0;
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uint16_t new_time = timer_read();
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uint16_t diff = new_time - time;
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time = new_time;
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last_result = (last_result + diff) % (MAX_DEBOUNCE + 1);
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return last_result;
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}
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void update_debounce_counters(uint8_t num_rows, uint8_t current_time);
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void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time);
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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(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
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uint8_t current_time = wrapping_timer_read();
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bool needed_update = counters_need_update;
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if (counters_need_update) {
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update_debounce_counters(num_rows, current_time);
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}
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if (changed || (needed_update && !counters_need_update) || matrix_need_update) {
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transfer_matrix_values(raw, cooked, num_rows, current_time);
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}
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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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void update_debounce_counters(uint8_t num_rows, uint8_t current_time) {
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counters_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 (TIMER_DIFF(current_time, *debounce_pointer, MAX_DEBOUNCE) >= DEBOUNCE) {
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*debounce_pointer = DEBOUNCE_ELAPSED;
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} else {
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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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void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time) {
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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 = current_time;
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cooked[row] = raw_row;
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counters_need_update = true;
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} else {
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matrix_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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bool debounce_active(void) { return true; }
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