ARMmbed
/
mbed-os
mirror of https://github.com/ARMmbed/mbed-os.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Merge pull request #4453 from c1728p9/lp_ticker_fix 

Safely initialize RTC on kinetis devices
pull/3506/merge
Sam Grove 2017-06-07 09:58:49 -05:00 committed by GitHub
parent 8232afa53e f749a2990b
commit 01e4520548
1 changed files with 20 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/api/lp_ticker.c
View File

@ -33,6 +33,13 @@ static int lptmr_schedule = 0;
static void rtc_isr(void) static void rtc_isr(void)
{ {
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_DisableInterrupts(RTC, kRTC_AlarmInterruptEnable);
RTC->TAR = 0; /* Write clears the IRQ flag */ RTC->TAR = 0; /* Write clears the IRQ flag */
@ -44,6 +51,9 @@ static void rtc_isr(void)
} else { } else {
lp_ticker_irq_handler(); lp_ticker_irq_handler();
} }
} else if (sr & RTC_SR_TIF_MASK) {
RTC_DisableInterrupts(RTC, kRTC_TimeOverflowInterruptEnable);
}
} }
static void lptmr_isr(void) static void lptmr_isr(void)
@ -73,6 +83,7 @@ void lp_ticker_init(void)
RTC_StartTimer(RTC); RTC_StartTimer(RTC);
} }
RTC->TAR = 0; /* Write clears the IRQ flag */
NVIC_ClearPendingIRQ(RTC_IRQn); NVIC_ClearPendingIRQ(RTC_IRQn);
NVIC_SetVector(RTC_IRQn, (uint32_t)rtc_isr); NVIC_SetVector(RTC_IRQn, (uint32_t)rtc_isr);
NVIC_EnableIRQ(RTC_IRQn); NVIC_EnableIRQ(RTC_IRQn);