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lp ticker - fix until methods - time is in period addition #60

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lp ticker - fix until methods - time is in period addition #60

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29 changes: 27 additions & 2 deletions source/lp_ticker.c
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Original file line number Diff line number Diff line change
Expand Up @@ -150,7 +150,18 @@ uint32_t lp_ticker_get_compare_match(void)
return lp_compare_value;
}

void lp_ticker_set_interrupt(uint32_t now, uint32_t time) {
static bool time_is_in_period(uint32_t start, uint32_t time, uint32_t end)
{
if((time >= start && (time < end || start >= end)) ||
(time < start && end < start && end > time)) {
return true;
}
return false;
}

// now is the checked-current counter value, which we use to calculate delta
static void lp_ticker_set_interrupt_internal(uint32_t now, uint32_t time)
{
// On K64F, the compare value can be only set when the LPTMR is disabled
// However, disabling the LPTMR will automatically clear the LPTMR counter
// So we need to compensate for the time that already passed
Expand Down Expand Up @@ -180,9 +191,23 @@ void lp_ticker_set_interrupt(uint32_t now, uint32_t time) {
RTC_HAL_EnableCounter(RTC_BASE, true);
}

void lp_ticker_set_interrupt(uint32_t now, uint32_t time) {
// use the latest real time
uint32_t real_now = lp_ticker_read();
if (!time_is_in_period(now, real_now, time)) {
return;
}
lp_ticker_set_interrupt_internal(real_now, time);
}

void lp_ticker_sleep_until(uint32_t now, uint32_t time)
{
lp_ticker_set_interrupt(now, time);
// use the latest real time
uint32_t real_now = lp_ticker_read();
if (!time_is_in_period(now, real_now, time)) {
return;
}
lp_ticker_set_interrupt_internal(real_now, time);
sleep_t sleep_obj;
mbed_enter_sleep(&sleep_obj);
// if LPTMR is running and we scheduled it, we know that RTC was fired while
Expand Down