STM32f10x WWDG ''Window WatchDog Timer''

fatemehjml · ‎2014-01-21

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,

Tesla DeLorean · ‎2014-01-21

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 · ‎2014-01-21

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.