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#include "button.h"
#define DEBOUNCE_HIGH_THRES (200) // 0-255
#define DEBOUNCE_LOW_THRES (55) // 0-255
#define LONGPRESS_THRES (25) // Hz
#define BUTTON_SCAN_FREQ (50) // Hz
static volatile void (*onePressHandler[KEY_INDEX])(void) = { NULL };
static volatile void (*longPressHandler[KEY_INDEX])(void) = { NULL };
void btn_init()
{
GPIOA_ModeCfg(KEY1_PIN, GPIO_ModeIN_PD);
GPIOB_ModeCfg(KEY2_PIN, GPIO_ModeIN_PU);
TMR3_TimerInit(FREQ_SYS/BUTTON_SCAN_FREQ);
TMR3_ITCfg(ENABLE, TMR0_3_IT_CYC_END);
PFIC_EnableIRQ(TMR3_IRQn);
}
void btn_onOnePress(int key, void (*handler)(void))
{
if (key >= KEY_INDEX) return;
onePressHandler[key] = handler;
}
void btn_onLongPress(int key, void (*handler)(void))
{
if (key >= KEY_INDEX) return;
longPressHandler[key] = handler;
}
__HIGH_CODE
static int debounce(int key, int is_press)
{
static int y[KEY_INDEX], flag[KEY_INDEX];
if (key >= KEY_INDEX) return 0;
// RC filter
y[key] -= y[key] >> 2;
y[key] += is_press ? 0x3F : 0;
// Schmitt trigger
if ((y[key] > DEBOUNCE_HIGH_THRES) && (flag[key] == 0))
flag[key] = 1;
if ((y[key] < DEBOUNCE_LOW_THRES) && (flag[key] == 1))
flag[key] = 0;
return flag[key];
}
__HIGH_CODE
static void check(int k)
{
static int hold[KEY_INDEX], is_longpress[KEY_INDEX];
if (k >= KEY_INDEX) return; // TODO: assert instead
if (debounce(k, isPressed(k))) {
hold[k]++;
if (hold[k] >= LONGPRESS_THRES && is_longpress[k] == 0) {
is_longpress[k] = 1;
if (longPressHandler[k]) longPressHandler[k]();
}
} else {
if (hold[k] > 0 && hold[k] < LONGPRESS_THRES) {
if (onePressHandler[k]) onePressHandler[k]();
}
is_longpress[k] = 0;
hold[k] = 0;
}
}
__HIGH_CODE
static void check_keys()
{
for (int k=0; k<KEY_INDEX; k++) {
check(k);
}
}
__INTERRUPT
__HIGH_CODE
void TMR3_IRQHandler(void)
{
if (TMR3_GetITFlag(TMR0_3_IT_CYC_END)) {
check_keys();
TMR3_ClearITFlag(TMR0_3_IT_CYC_END);
}
}
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