topic Re: RTC clock get time and date from LPC54618 in LPC Microcontrollers

RTC clock get time and date from LPC54618

gmk1 — Sat, 23 Feb 2019 09:18:19 GMT

I'm trying to use the internal RTC clock module as per configuration below. Initialization seems okay.

But variable "date" does not increment seconds and so is the variable "mydate".

What could be wrong?

Here is my RTC config -

rtc_datetime_t date;

rtc_datetime_t mydate;

In Main

{

RTC_Config();

while(1)

{

RTC_GetDatetime(RTC,&date); // seconds should be incrementing at 1 sec rate but it doesn't

mydate = date;

}

void RTC_Config(void)
{

/* Enable the external RTC 32K Oscillator */
SYSCON->RTCOSCCTRL |= SYSCON_RTCOSCCTRL_EN_MASK;
/* Init RTC */
RTC_Init(RTC);
/* Set a start date & time */
date.year = 2019U;
date.month = 2U;
date.day = 9U;
date.hour = 9U;
date.minute = 0;
date.second = 0;
/* RTC time counter has to be stopped before setting the date & time in the TSR register */
RTC_StopTimer(RTC);
/* Set RTC time to default */
RTC_SetDatetime(RTC, &date);
/* Start the RTC time counter */
RTC_StartTimer(RTC);
}

-Gmk

Re: RTC clock get time and date from LPC54618

gmk1 — Mon, 25 Feb 2019 08:32:02 GMT

No worries. Its working. My mistake. I forgot to mount capacitors between crystal and ground.

Re: RTC clock get time and date from LPC54618

ZhangJennie — Mon, 25 Feb 2019 08:43:38 GMT

I don't have exact your board, but I just tested your issue with my LPC54608 board.

I use mcuxpresso demo code under ..\LPC54608\SDK_2.5.0_LPCXpresso54608\boards\lpcxpresso54608\driver_examples\rtc

I commented

// RTC_EnableInterrupts(RTC, kRTC_AlarmInterruptEnable);

// EnableIRQ(RTC_IRQn);

Thus my code should be same as yours.

when I step over code, I can see RTC->COUNT value changed after "RTC_StartTimer()". So I can't reproduce your issue.

I would suggest you test the same demo code on your side, comparing the register setting of the demo with your working project to shoot trouble.

Have a great day,
Jun Zhang

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Re: RTC clock get time and date from LPC54618

gmk1 — Mon, 25 Feb 2019 08:51:31 GMT

Actually I forgot to mount capacitors near crystal section and thus not providing ground to it.

Now its working. I've already replied myself to the question about this and it is under moderation when I'm writing this.

Thanks anyway.

Re: RTC clock get time and date from LPC54618

ZhangJennie — Mon, 25 Feb 2019 09:54:34 GMT

That's ok. Thanks for your sharing. :-)

Re: RTC clock get time and date from LPC54618

gmk1 — Mon, 25 Feb 2019 09:58:33 GMT

Hi ZhangJennie,

Can you help me with this one - https://community.nxp.com/thread/496377

Re: RTC clock get time and date from LPC54618

ZhangJennie — Mon, 25 Feb 2019 14:23:34 GMT

Hi Manikata,

I checked internally that my colleague has taken your CAN transmission thread and is working on it. Don't worry.

Have a nice day,

Jennie Zhang