quantum/debounce/sym_g.c

   1 /*
   2 Copyright 2017 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/>.
  13 */
  14
  15 /*
  16 Basic global debounce algorithm. Used in 99% of keyboards at time of implementation
  17 When no state changes have occured for DEBOUNCE milliseconds, we push the state.
  18 */
  19 #include "matrix.h"
  20 #include "timer.h"
  21 #include "quantum.h"
  22 #ifndef DEBOUNCE
  23 #    define DEBOUNCE 5
  24 #endif
  25
  26 void        debounce_init(uint8_t num_rows) {}
  27 static bool debouncing = false;
  28
  29 #if DEBOUNCE > 0
  30 static uint16_t debouncing_time;
  31 void            debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
  32     if (changed) {
  33         debouncing      = true;
  34         debouncing_time = timer_read();
  35     }
  36
  37     if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
  38         for (int i = 0; i < num_rows; i++) {
  39             cooked[i] = raw[i];
  40         }
  41         debouncing = false;
  42     }
  43 }
  44 #else  // no debouncing.
  45 void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
  46     for (int i = 0; i < num_rows; i++) {
  47         cooked[i] = raw[i];
  48     }
  49 }
  50 #endif
  51
  52 bool debounce_active(void) { return debouncing; }