/* 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> #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 #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; }