MSP430F5510: MSP430F5510 RTC doesn't work.

Yumi Li

Prodigy 50 points

Part Number: MSP430F5510

Dear All,

I have designed a PCB that has a XT1 external 32.768KHz crystal attached across XIN & XOUT.

I am trying to configure the RTC_A and to toggle P1.1 and P1.2 output every minute in software.

But RTC doesn't work. What's wrong?

Here is my code;

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·#include <msp430f5510.h>
·#pragma vector = RTC_VECTOR· · · //RTC interrupt service
·__interrupt void TOG_min(void)
·{··
· · if(RTCTEVIFG == 1)·
· · {
· · · ·P1OUT ^= 0x06;
· · }
·}
int main(void)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

 #include <msp430f5510.h>

 #pragma vector = RTC_VECTOR      //RTC interrupt service

 __interrupt void TOG_min(void)

 {  

    if(RTCTEVIFG == 1) 

    {

       P1OUT ^= 0x06;

    }

 }



int main(void)

{

  WDTCTL = WDTPW | WDTHOLD;



  P1SEL &=~(0x06);

  P1DIR |= (BIT1 + BIT2);

  P1OUT |= 0x06;

  P5SEL = 0x30;

  P5DIR |= 0x20;



  RTCCTL0 |= (RTCTEVIE + RTCRDYIFG);

  RTCCTL1 |= (RTCBCD + RTCHOLD +RTCMODE + RTCSSEL_ACLK + RTCTEV_0);



  RTCYEARH = 0x20;

  RTCYEARL = 0x22;

  RTCMON = 0x12;

  RTCDAY = 0x05;

  RTCDOW = 0x00;

  RTCHOUR = 0x10;

  RTCMIN = 0x01;

  RTCSEC = 0x01;



  RTCCTL1 &= ~RTCHOLD;

  __bis_SR_register(LPM3_bits + GIE);



 while(1);

}

over 2 years ago

0 Bruce McKenney over 2 years ago

Guru 96305 points

> if(RTCTEVIFG == 1)

This test is always False since RTCTEVIFG == 4. I suspect you meant:

> if(RTCCTL0 & RTCTEVIFG)

Don't forget to clear it afterwards with "RTCCTL0 &= ~RTCTEVIFG;", or use the RTCIV register.

-----

Perhaps the simplest way to see whether the RTC is running is to wait a few seconds, pause the debugger, and see if RTCSEC/RTCMIN are different from what you set them to.

0 Jace H over 2 years ago

TI__Guru 56685 points

Hello Yumi,

When posting code to the forum, please utilize the code insert button for formatting menu of Insert , </> Code. I've edited your post to reflect this.

In addition to Bruce's comment, also double check your external crystal is oeprating correctly with thsi code example: https://dev.ti.com/tirex/explore/node?node=A__AAbdlkLHGBFsUC9B8poxrA__msp430ware__IOGqZri__LATEST

For additional crystal debug please see the following application note: www.ti.com/lit/slaa322

0 Yumi Li over 2 years ago in reply to Bruce McKenney

Prodigy 50 points

Thank you for your advice.

I modified the code as you suggested but RTC still doesn't work.

Is there any more code I need to add?

0 Yumi Li over 2 years ago in reply to Jace H

Prodigy 50 points

Thank you for your kind and comment.

0 Bruce McKenney over 2 years ago in reply to Yumi Li

Guru 96305 points

How do you tell that the RTC isn't working?

Did you try the program Jace H suggested?

0 Yumi Li over 2 years ago in reply to Bruce McKenney

Prodigy 50 points

I created a new code as suggested by Jace H but it didn't work.

There seems to be a problem with the test board.

I will recreated the test board and ask for help again if there are any problems.

Thank you.

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MSP430F5510: MSP430F5510 RTC doesn't work.