diff options
Diffstat (limited to 'quantum/debounce/asym_eager_defer_pk.c')
| -rw-r--r-- | quantum/debounce/asym_eager_defer_pk.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/quantum/debounce/asym_eager_defer_pk.c b/quantum/debounce/asym_eager_defer_pk.c new file mode 100644 index 0000000000..24380dc5e5 --- /dev/null +++ b/quantum/debounce/asym_eager_defer_pk.c @@ -0,0 +1,171 @@ +/* + * Copyright 2017 Alex Ong <the.onga@gmail.com> + * Copyright 2020 Andrei Purdea <andrei@purdea.ro> + * Copyright 2021 Simon Arlott + * + * 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 + +// Maximum debounce: 127ms +#if DEBOUNCE > 127 +# undef DEBOUNCE +# define DEBOUNCE 127 +#endif + +#define ROW_SHIFTER ((matrix_row_t)1) + +typedef struct { + bool pressed : 1; + uint8_t time : 7; +} debounce_counter_t; + +#if DEBOUNCE > 0 +static debounce_counter_t *debounce_counters; +static fast_timer_t last_time; +static bool counters_need_update; +static bool matrix_need_update; + +#define DEBOUNCE_ELAPSED 0 + +static void update_debounce_counters_and_transfer_if_expired(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t elapsed_time); +static void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows); + +// we use num_rows rather than MATRIX_ROWS to support split keyboards +void debounce_init(uint8_t num_rows) { + debounce_counters = 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++].time = DEBOUNCE_ELAPSED; + } + } +} + +void debounce_free(void) { + free(debounce_counters); + debounce_counters = NULL; +} + +void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) { + bool updated_last = false; + + if (counters_need_update) { + fast_timer_t now = timer_read_fast(); + fast_timer_t elapsed_time = TIMER_DIFF_FAST(now, last_time); + + last_time = now; + updated_last = true; + if (elapsed_time > UINT8_MAX) { + elapsed_time = UINT8_MAX; + } + + if (elapsed_time > 0) { + update_debounce_counters_and_transfer_if_expired(raw, cooked, num_rows, elapsed_time); + } + } + + if (changed || matrix_need_update) { + if (!updated_last) { + last_time = timer_read_fast(); + } + + transfer_matrix_values(raw, cooked, num_rows); + } +} + +static void update_debounce_counters_and_transfer_if_expired(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t elapsed_time) { + debounce_counter_t *debounce_pointer = debounce_counters; + + counters_need_update = false; + matrix_need_update = false; + + for (uint8_t row = 0; row < num_rows; row++) { + for (uint8_t col = 0; col < MATRIX_COLS; col++) { + matrix_row_t col_mask = (ROW_SHIFTER << col); + + if (debounce_pointer->time != DEBOUNCE_ELAPSED) { + if (debounce_pointer->time <= elapsed_time) { + debounce_pointer->time = DEBOUNCE_ELAPSED; + + if (debounce_pointer->pressed) { + // key-down: eager + matrix_need_update = true; + } else { + // key-up: defer + cooked[row] = (cooked[row] & ~col_mask) | (raw[row] & col_mask); + } + } else { + debounce_pointer->time -= elapsed_time; + counters_need_update = true; + } + } + debounce_pointer++; + } + } +} + +static void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows) { + 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++) { + matrix_row_t col_mask = (ROW_SHIFTER << col); + + if (delta & col_mask) { + if (debounce_pointer->time == DEBOUNCE_ELAPSED) { + debounce_pointer->pressed = (raw[row] & col_mask); + debounce_pointer->time = DEBOUNCE; + counters_need_update = true; + + if (debounce_pointer->pressed) { + // key-down: eager + cooked[row] ^= col_mask; + } + } + } else if (debounce_pointer->time != DEBOUNCE_ELAPSED) { + if (!debounce_pointer->pressed) { + // key-up: defer + debounce_pointer->time = DEBOUNCE_ELAPSED; + } + } + debounce_pointer++; + } + } +} + +bool debounce_active(void) { return true; } +#else +# include "none.c" +#endif |