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fatemehjml
fatemehjml
Associate II
January 21, 2014
Question

STM32f10x WWDG ''Window WatchDog Timer''

  • January 21, 2014
  • 2 replies
  • 694 views
Posted on January 21, 2014 at 13:46

Hello

   I am using STM32f103RET6 in my project. This project is very important and device should never stop working. Also device is remote and it is not possible to reset it easily.

I try to use WWDG for unforeseen cpu faults. The problem is that I use 1sec delay loop in my project and the MAX timeout time for WWDG is about 58ms. When I use it in my project device reset before one loop running. Any suggestion to solve this problem in my project?

Regards,

Thanks,
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    2 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    January 21, 2014
    Posted on January 21, 2014 at 15:32

    Any suggestion to solve this problem in my project?

    Rethink your delay loop
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    chen
    chen
    Associate II
    January 21, 2014
    Posted on January 21, 2014 at 15:49

    ''Rethink your delay loop ''

    LOL - Harsh but true ;)

    Try a delay of 10ms and in your main loop count 100 of these delays.

    On the 100th count - execute what you have now.

    In the main loop - kick the WDT ie it get kicked every 10ms.

    Also be sure to check the execution time of what ever is being executed - make sure it is shorter than the WDT period.

    If it is longer - you will have to add some mode 'kick the WDT' in the code at regular time intervals.

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