2 Copyright 2019 Alex Ong<the.onga@gmail.com>
3 This program is free software: you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation, either version 2 of the License, or
6 (at your option) any later version.
7 This program is distributed in the hope that it will be useful,
8 but WITHOUT ANY WARRANTY; without even the implied warranty of
9 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 GNU General Public License for more details.
11 You should have received a copy of the GNU General Public License
12 along with this program. If not, see <http://www.gnu.org/licenses/>.
16 Basic per-row algorithm. Uses an 8-bit counter per row.
17 After pressing a key, it immediately changes state, and sets a counter.
18 No further inputs are accepted until DEBOUNCE milliseconds have occurred.
31 #define debounce_counter_t uint8_t
33 static debounce_counter_t *debounce_counters;
35 #define DEBOUNCE_ELAPSED 251
36 #define MAX_DEBOUNCE (DEBOUNCE_ELAPSED - 1)
38 void update_debounce_counters(uint8_t num_rows, uint8_t current_time);
39 void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time);
41 //we use num_rows rather than MATRIX_ROWS to support split keyboards
42 void debounce_init(uint8_t num_rows)
44 debounce_counters = (debounce_counter_t*)malloc(num_rows*sizeof(debounce_counter_t));
45 for (uint8_t r = 0; r < num_rows; r++)
47 debounce_counters[r] = DEBOUNCE_ELAPSED;
51 void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed)
53 uint8_t current_time = timer_read() % MAX_DEBOUNCE;
54 update_debounce_counters(num_rows, current_time);
55 transfer_matrix_values(raw, cooked, num_rows, current_time);
58 //If the current time is > debounce counter, set the counter to enable input.
59 void update_debounce_counters(uint8_t num_rows, uint8_t current_time)
61 debounce_counter_t *debounce_pointer = debounce_counters;
62 for (uint8_t row = 0; row < num_rows; row++)
64 if (*debounce_pointer != DEBOUNCE_ELAPSED)
66 if (TIMER_DIFF(current_time, *debounce_pointer, MAX_DEBOUNCE) >= DEBOUNCE) {
67 *debounce_pointer = DEBOUNCE_ELAPSED;
74 // upload from raw_matrix to final matrix;
75 void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time)
77 debounce_counter_t *debounce_pointer = debounce_counters;
78 for (uint8_t row = 0; row < num_rows; row++)
80 matrix_row_t existing_row = cooked[row];
81 matrix_row_t raw_row = raw[row];
83 //determine new value basd on debounce pointer + raw value
84 if (*debounce_pointer == DEBOUNCE_ELAPSED &&
85 (existing_row != raw_row))
87 *debounce_pointer = current_time;
88 existing_row = raw_row;
90 cooked[row] = existing_row;
96 bool debounce_active(void)