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Diffstat (limited to 'quantum/debounce/sym_pk.c')
| -rw-r--r-- | quantum/debounce/sym_pk.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/quantum/debounce/sym_pk.c b/quantum/debounce/sym_pk.c new file mode 100644 index 0000000000..f404cf9c44 --- /dev/null +++ b/quantum/debounce/sym_pk.c @@ -0,0 +1,111 @@ +/* +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; } |