topic Re: lpc4088 RTC stucked in LPC Microcontrollers

lpc4088 RTC stucked

alesandro_piazza — Wed, 20 Jan 2021 14:13:51 GMT

Does anyone know the meaning of bit 0x00000020 fo CCR register? sometimes CCR goes to 0x31 (instead of 0x11) and RTC gets stucked... ther is no way to reset it (battery disconnection, power supply reset, uc reprogramming). Thanks!

Re: lpc4088 RTC stucked

Alice_Yang — Fri, 22 Jan 2021 06:40:03 GMT

Hello ,

The bit 5 of CCR is no meaning, ignore it .

And pay attention all NC bits in this register CCR should be initialized when the RTC is first turned on.

Also there is RTC demo under LPCopen, recommend you have a look, download from:

https://www.nxp.com/design/microcontrollers-developer-resources/lpcopen-libraries-and-examples/lpcopen-software-development-platform-lpc40xx:LPCOPEN-SOFTWARE-FOR-LPC40XX

Regards,

Alice

Re: lpc4088 RTC stucked

alesandro_piazza — Thu, 21 Jan 2021 13:49:15 GMT

Hi, I'm using this sequence:

Chip_RTC_Init(LPC_RTC);
//
FullTime.time[RTC_TIMETYPE_SECOND] = 0;
FullTime.time[RTC_TIMETYPE_MINUTE] = 0;
FullTime.time[RTC_TIMETYPE_HOUR] = 0;
FullTime.time[RTC_TIMETYPE_DAYOFMONTH] = 20;
FullTime.time[RTC_TIMETYPE_DAYOFWEEK] = 3;
FullTime.time[RTC_TIMETYPE_DAYOFYEAR] = 20;
FullTime.time[RTC_TIMETYPE_MONTH] = 01;
FullTime.time[RTC_TIMETYPE_YEAR] = 2021;
Chip_RTC_SetFullTime(LPC_RTC, &FullTime);

/* Enable rtc (starts increase the tick counter and second counter register) */
Chip_RTC_Enable(LPC_RTC, ENABLE);

void Chip_RTC_Init(LPC_RTC_T *pRTC)
{
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_RTC);

/* Disable RTC */
Chip_RTC_Enable(pRTC, DISABLE);

/* Disable Calibration */
Chip_RTC_CalibCounterCmd(pRTC, DISABLE);

/* Reset RTC Clock */
Chip_RTC_ResetClockTickCounter(pRTC);

/* Clear counter increment and alarm interrupt */
pRTC->ILR = RTC_IRL_RTCCIF | RTC_IRL_RTCALF;
while (pRTC->ILR != 0) {}

/* Clear all register to be default */
pRTC->CIIR = 0x00;
pRTC->AMR = 0xFF;
pRTC->CALIBRATION = 0x00;
}

I have ten boards working properly, this same card worked fine before it was reprogrammed. Even if I uploaded old FW (using built in UART bootloader) there is no way to make RTC to count again.

Re: lpc4088 RTC stucked

alesandro_piazza — Thu, 21 Jan 2021 13:57:56 GMT

I cannot find any support for LPC4088 under SDK

Re: lpc4088 RTC stucked

Alice_Yang — Fri, 22 Jan 2021 06:30:48 GMT

Hello ,

Sorry, under LPCopen, there is RTC demo for LPC4088:

https://www.nxp.com/design/microcontrollers-developer-resources/lpcopen-libraries-and-examples/lpcopen-software-development-platform-lpc40xx:LPCOPEN-SOFTWARE-FOR-LPC40XX

Regards,

Alice

Re: lpc4088 RTC stucked

alesandro_piazza — Fri, 22 Jan 2021 07:55:37 GMT

Hello!

I've just tried the demo code... same behaviour, rtc stucked.

Re: lpc4088 RTC stucked

Alice_Yang — Mon, 25 Jan 2021 06:19:48 GMT

Hello,

What about the detail appearance of stuck?

Re: lpc4088 RTC stucked

alesandro_piazza — Thu, 28 Jan 2021 10:09:30 GMT

Hi, just solved thanks.

bad rtc crystal, I think something goes wrong when we fix them to the board (we fold the crystal).