sravan/system76-embedded-controller
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Debounce key releases (needs testing)

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This commit is contained in:
Jeremy Soller 2019-12-07 11:02:02 -07:00
parent ae52109b13
commit e85611736c
No known key found for this signature in database
GPG Key ID: E988B49EE78A7FB1
1 changed files with 33 additions and 0 deletions
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33
src/board/system76/galp3-c/kbscan.c
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@ -1,3 +1,5 @@
#include <mcs51/8052.h>
#include <arch/delay.h>
#include <board/kbc.h>
#include <board/kbscan.h>
@ -18,6 +20,9 @@ void kbscan_init(void) {
KSOLGOEN = 0;
KSOHGCTRL = 0xFF;
KSOHGOEN = 0;
// Make sure timer 2 is stopped
T2CON = 0;
}
void kbscan_event(void) {
@ -25,6 +30,14 @@ void kbscan_event(void) {
uint8_t layer = kbscan_layer;
static uint8_t kbscan_last[KM_OUT] = { 0 };
// If timer 2 is finished
if (TF2) {
// Stop timer 2 running
TR2 = 0;
// Clear timer 2 finished flag
TF2 = 0;
}
int i;
for (i = 0; i < KM_OUT; i++) {
// Set current line as output
@ -47,6 +60,26 @@ void kbscan_event(void) {
bool new_b = new & (1 << j);
bool last_b = last & (1 << j);
if (new_b != last_b) {
// If timer 2 is running
if (TR2) {
// Debounce releases
if (!new_b) {
// Restore bit, so that this release can be handled later
new |= (1 << j);
// Skip processing of release
continue;
}
} else {
// Begin debouncing on press
if (new_b) {
// Run timer 2 for 20 ms
// 65536-(20000 * 69 + 89)/90 = 0xC419
TH2 = 0xC4;
TL2 = 0x19;
TR2 = 1;
}
}
uint16_t key = keymap(i, j, kbscan_layer);
DEBUG("KB %d, %d, %d = 0x%04X, %d\n", i, j, kbscan_layer, key, new_b);
switch (key & KT_MASK) {