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Need help with watchdog

bose

Hello,

 

I have a question regarding the watchdog timer in PSoC 4.

As per the documentation there are three counters:

  • Counter 0 & Counter 1 = 16bit driven by ILO 32Khz and can be cascaded
  • Counter 2 = 32bit driven by ILO 32KHz

I wish to use the Counter 2 to generate a 2Second wake-up Interrupt from deep sleep for the PSoC4.

And Counter 1 + Counter 0 for the WDT Reset at 5Seconds.which would reset the microcontroller in case it fails to clear the counter 1 & counter 0.

 

However no where I could find any information on the cascade scheme of the counters.

 

Kindly help me out on this.

 

Warm Regards,

Abhijit

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  • You need the CySysWdtWriteMode() call. It configures the counters to either interrupt or reset mode.  CySysWdtWriteCascade() is used to cascade the counters together. Use  CySysWdtWriteToggleBit() to define the period for counter2 (can only be a power of 2).  CySysWdtWriteMatch(() is not supported for counter 2! Look at the function description in the System reference manual...

     

    On the interrupt of counter 2, you need to reset counters 0 and 1. (Maybe also toggle a LED in the ISR, to see whether it gets called at all - you should try to get that working properly first...)

  • in reply to hlipka

    Hendrik,

    Yes it is right CySysWdtWriteMatch(() is not supported for counter 2.

    but can you roughly give an algo for cascading two timers to get >= 5 sec watchdog interrupt interval, Because I also want to cascade two timers to achieve >= 5 seconds of watchdog interrupt interval.

    I agree with Abhijit that it is not described at any of document that in which sequence we use watchdog API to cascade two timers.

    Can we achieve this by using counter 2 (As counter 2 has a 32-bit period)?

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  • in reply to hlipka

    Hendrik,

    Yes it is right CySysWdtWriteMatch(() is not supported for counter 2.

    but can you roughly give an algo for cascading two timers to get >= 5 sec watchdog interrupt interval, Because I also want to cascade two timers to achieve >= 5 seconds of watchdog interrupt interval.

    I agree with Abhijit that it is not described at any of document that in which sequence we use watchdog API to cascade two timers.

    Can we achieve this by using counter 2 (As counter 2 has a 32-bit period)?

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