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kbscan: Return early if debouncing

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A single timer is used for debouncing all keys, so there is no reason to
perform any operations if the matrix is being debounced. Just return
early and remove some of the convoluted logic.

Signed-off-by: Tim Crawford <tcrawford@system76.com>
This commit is contained in:
Tim Crawford
2023-07-24 17:17:49 -06:00
committed by Jeremy Soller
parent 8a1adc2bdc
commit 546458e368
1 changed files with 37 additions and 44 deletions
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23
src/board/system76/common/kbscan.c
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@ -328,8 +328,11 @@ void kbscan_event(void) {
if (debounce) {
uint32_t time = time_get();
if ((time - debounce_time) >= DEBOUNCE_DELAY) {
// Finish debounce
// Debounce time elapsed: Read new state
debounce = false;
} else {
// If still debouncing, don't do anything.
return;
}
}
@ -338,11 +341,11 @@ void kbscan_event(void) {
uint8_t last = kbscan_matrix[i];
if (new != last) {
if (kbscan_has_ghost_in_row(i, new)) {
kbscan_ghost[i] = true;
continue;
} else if (kbscan_ghost[i]) {
kbscan_ghost[i] = false;
// Debounce to allow remaining ghosts to settle.
}
// Some key has changed state: Start debounce
if (!debounce) {
debounce = true;
debounce_time = time_get();
}
@ -356,15 +359,6 @@ void kbscan_event(void) {
if (new_b != last_b) {
bool reset = false;
// If debouncing
if (debounce) {
// Debounce presses and releases
reset = true;
} else {
// Begin debounce
debounce = true;
debounce_time = time_get();
// Check keys used for config reset
if (matrix_position_is_esc(i, j))
kbscan_esc_held = new_b;
@ -399,7 +393,6 @@ void kbscan_event(void) {
} else {
WARN("KB %d, %d, %d missing\n", i, j, kbscan_layer);
}
}
// Reset bit to last state
if (reset) {