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johankrug
Visitor II
March 9, 2009
Question

No RTC Interrupt (??)

  • March 9, 2009
  • 2 replies
  • 934 views
Posted on March 09, 2009 at 11:01

No RTC Interrupt (??)

    This topic has been closed for replies.

    2 replies

    J
    johankrugAuthor
    Visitor II
    March 9, 2009
    Posted on March 09, 2009 at 11:01

    Hi,

    I'm a bit.. desperate.. I have a STR 715 (ofcourse with built-in RTC) with 32.768Khz crystal. So... It should work.. But, it doesn't.

    I'm using the following code to initalize the RTC for every second an interrupt (ripped from the ST-example-code. =) ).

    Code:

    /* Configure RTC prescaler */

    RTC_PrescalerConfig ( 0x8000 );

    /* Clear Pending Flags */

    RTC_FlagClear ( RTC_OWIR );

    RTC_FlagClear ( RTC_AIR );

    RTC_FlagClear ( RTC_SIR );

    RTC_FlagClear ( RTC_GIR );

    /* Enable RTC IRQ channel */

    EIC_IRQChannelConfig( RTC_IRQChannel, ENABLE );

    EIC_IRQChannelPriorityConfig( RTC_IRQChannel, 1);

    EIC_IRQConfig( ENABLE );

    /* Enable Second Interrupt */

    RTC_ITConfig( RTC_SIT, ENABLE );

    RTC_ITConfig( RTC_GIT, ENABLE );

    The problem is; no interrupt will be generated.. Not one.. Not for a second, or ten seconds.. It just never goes into the RTC-ISR..

    I've copied everything from the ST code examples. Checked and double-checked everything.. And I don't know why it refuses to handle the ISR. :S. And it drives me crazy.. :S

    I'm using Keil uVision3 with keil compiler V2.41

    Any ideas?

    Thnx

    Jay Kay.

    K
    Kaouther BELHADJ
    ST Employee
    May 17, 2010
    Posted on May 17, 2010 at 22:17

    Make sure the  RTC clock is at least 4 times slower than PCLK2.   

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