Kinetis MicrocontrollersのトピックRe: RTC time counter doesn't work on K64

RTC time counter doesn't work on K64

Mota — Mon, 06 Dec 2021 11:24:04 GMT

Hi guys,

I'm working with a RTC peripheral on K64 with external 32,768Khz clock and the time counter doesn't seem to work. In other words, the RTC->TSR content stay the same. I verified on the XTAL output and the oscillator is working correctly.

There is my init :

rtc_config_t RTC_config = { .wakeupSelect = false, .updateMode = false, .supervisorAccess = false, .compensationInterval = 0x0U, .compensationTime = 0x0U }; dateTime_st.u16Year = 2021; dateTime_st.u8Month = 11; dateTime_st.u8Day = 24; dateTime_st.u8Hour = 8; dateTime_st.u8Min = 54; dateTime_st.u8Sec = 00; /* RTC initialization */ RTC_Init(RTC, &RTC_config); /* Select RTC clock source */ RTC_SetClockSource(RTC); // Same as : RTC->CR |= RTC_CR_OSCE_MASK; /* Stop RTC timer */ RTC_StopTimer(RTC); // Same as : RTC->SR |= ~RTC_SR_TCE_MASK; /* Date and time initialization */ RTC_SetDatetime(RTC, (rtc_datetime_t *) &dateTime_st); /* Start RTC timer */ RTC_StartTimer(RTC); // Same as : RTC->SR |= RTC_SR_TCE_MASK;

My clock sources and diagram configuration :

Any idea ?

Thank you by advance.

Best regards.

Mota

Re: RTC time counter doesn't work on K64

nxf77486 — Tue, 07 Dec 2021 19:20:13 GMT

Hello @Mota ,

Thank you for your information I understand that your HW 32kHZ crystal is fine. Can you please check the RTC oscillator initialization that something has not been missing like the RTC_CR_OSCE bit (check if this is being set 1).

I also due recommend to try one of the SDK examples for the RTC.

Re: RTC time counter doesn't work on K64

Mota — Wed, 08 Dec 2021 13:44:21 GMT

Hi @nxf77486,

Thank you for your answer. RTC_CR_OSCE is well set to "1". I verified SR[TOF] and SR[TIF] bits and they are set to "0". Then the time counter should increment this value but it's not the case. The RTC_TSR counter stay always at the same value which is set at the beginning by RTC_SetDatetime().

There is the setup of my oscillator (It’s automaticaly genereted when I setup the clock sources) :

{ /* RTC clock gate enable */ CLOCK_EnableClock(kCLOCK_Rtc0); if ((RTC->CR & RTC_CR_OSCE_MASK) == 0u) { /* Only if the Rtc oscillator is not already enabled */ /* Set the specified capacitor configuration for the RTC oscillator */ RTC_SetOscCapLoad(RTC, capLoad); /* Enable the RTC 32KHz oscillator */ RTC->CR |= RTC_CR_OSCE_MASK; } /* Output to other peripherals */ if (enableOutPeriph) { RTC->CR &= ~RTC_CR_CLKO_MASK; } else { RTC->CR |= RTC_CR_CLKO_MASK; } /* Set the XTAL32/RTC_CLKIN frequency based on board setting. */ CLOCK_SetXtal32Freq(BOARD_XTAL32K_CLK_HZ); /* Set RTC_TSR if there is fault value in RTC */ if (RTC->SR & RTC_SR_TIF_MASK) { RTC -> TSR = RTC -> TSR; } /* RTC clock gate disable */ CLOCK_DisableClock(kCLOCK_Rtc0); }

And it’s call in my main() by :

BOARD_InitBootClocks();

You will find below my RTC hardware configuration, I use VBAT too :

I don’t have FRDM-K64 board to test these kind of examples and I’m working with a MK64FX512xxx12 instead of MK64FN1M0xxx12..

Thank you.

Regards,

Mota

Re: RTC time counter doesn't work on K64

nxf77486 — Wed, 08 Dec 2021 19:24:19 GMT

Hello @Mota ,

I believe this could still be related with the RTC configuration.

I understand you are using a MK64FX512xxx12, but the RTC examples for the FRDM-K64 still a good reference for your project they still the same module.

SDK FRDM-K64

FRDM-K64F

Re: RTC time counter doesn't work on K64

Mota — Thu, 09 Dec 2021 08:46:28 GMT

Hi @nxf77486,

Ok I'll research in the RTC configuration first. Thank you for these examples. I let you know.

Thank you.

Regards,

Mota