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Avoid 8-bit timer overflows in debounce algorithms (#12240)

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* Add fast_timer_t that is 16-bit or 32-bit based on architecture

A 16-bit timer will overflow sooner but be faster to compare on AVR.

* Avoid 8-bit timer overflows in debounce algorithms

Count down remaining elapsed time instead of trying to do 8-bit timer
comparisons.

Add a "none" implementation that is automatically used if DEBOUNCE is
0 otherwise it will break the _pk/_pr count down.

* Avoid unnecessary polling of the entire matrix in sym_eager_pk

The matrix only needs to be updated when a debounce timer expires.

* Avoid unnecessary polling of the entire matrix in sym_eager_pr

The matrix only needs to be updated when a debounce timer expires.

The use of the "needed_update" variable is trying to do what
"matrix_need_update" was added to fix but didn't work because it only
applied when all keys finished debouncing.

* Fix sym_defer_g timing inconsistency compared to other debounce algorithms

DEBOUNCE=5 should process the key after 5ms, not 6ms

* Add debounce tests
This commit is contained in:
Simon Arlott 2021-06-09 08:23:21 +01:00 • committed by GitHub
parent f287597c19
commit b829a1d264
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20 changed files with 1588 additions and 92 deletions
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28
quantum/debounce/sym_defer_g.c
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@ -1,5 +1,6 @@
/*
Copyright 2017 Alex Ong<the.onga@gmail.com>
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
@ -23,30 +24,29 @@ When no state changes have occured for DEBOUNCE milliseconds, we push the state.
# define DEBOUNCE 5
#endif
void debounce_init(uint8_t num_rows) {}
static bool debouncing = false;
#if DEBOUNCE > 0
static uint16_t debouncing_time;
void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
static bool debouncing = false;
static fast_timer_t debouncing_time;
void debounce_init(uint8_t num_rows) {}
void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
if (changed) {
debouncing = true;
debouncing_time = timer_read();
debouncing_time = timer_read_fast();
}
if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
if (debouncing && timer_elapsed_fast(debouncing_time) >= DEBOUNCE) {
for (int i = 0; i < num_rows; i++) {
cooked[i] = raw[i];
}
debouncing = false;
}
}
#else // no debouncing.
void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
for (int i = 0; i < num_rows; i++) {
cooked[i] = raw[i];
}
}
#endif
bool debounce_active(void) { return debouncing; }
void debounce_free(void) {}
#else // no debouncing.
# include "none.c"
#endif