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Safely initialize RTC on kinetis devices #4453

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Merged
merged 1 commit into from
Jun 7, 2017
Merged

Safely initialize RTC on kinetis devices #4453

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31 changes: 21 additions & 10 deletions targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/api/lp_ticker.c
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Original file line number Diff line number Diff line change
Expand Up @@ -33,16 +33,26 @@ static int lptmr_schedule = 0;

static void rtc_isr(void)
{
RTC_DisableInterrupts(RTC, kRTC_AlarmInterruptEnable);
RTC->TAR = 0; /* Write clears the IRQ flag */

/* Wait subsecond remainder if any */
if (lptmr_schedule) {
LPTMR_SetTimerPeriod(LPTMR0, lptmr_schedule);
LPTMR_EnableInterrupts(LPTMR0, kLPTMR_TimerInterruptEnable);
LPTMR_StartTimer(LPTMR0);
} else {
lp_ticker_irq_handler();
uint32_t sr = RTC->SR;
if (sr & RTC_SR_TOF_MASK) {
// Reset RTC to 0 so it keeps counting
RTC_StopTimer(RTC);
RTC->TSR = 0;
RTC_StartTimer(RTC);
} else if (sr & RTC_SR_TAF_MASK) {
RTC_DisableInterrupts(RTC, kRTC_AlarmInterruptEnable);
RTC->TAR = 0; /* Write clears the IRQ flag */

/* Wait subsecond remainder if any */
if (lptmr_schedule) {
LPTMR_SetTimerPeriod(LPTMR0, lptmr_schedule);
LPTMR_EnableInterrupts(LPTMR0, kLPTMR_TimerInterruptEnable);
LPTMR_StartTimer(LPTMR0);
} else {
lp_ticker_irq_handler();
}
} else if (sr & RTC_SR_TIF_MASK) {
RTC_DisableInterrupts(RTC, kRTC_TimeOverflowInterruptEnable);
}
}

Expand Down Expand Up @@ -73,6 +83,7 @@ void lp_ticker_init(void)
RTC_StartTimer(RTC);
}

RTC->TAR = 0; /* Write clears the IRQ flag */
NVIC_ClearPendingIRQ(RTC_IRQn);
NVIC_SetVector(RTC_IRQn, (uint32_t)rtc_isr);
NVIC_EnableIRQ(RTC_IRQn);
Expand Down