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how to use watchdog ？

The Seven
Guru 11440 points
Other Parts Discussed in Thread: Z-STACK

Hi all

         if i enable WDT_IN_PM1 in the zstack，  how could i feed the dog ？ and  how long could  i cfg the feed dog duty？

BR!

  • 0
    Expert 1620 points
    Hi Seven,

    Which device are you using?, are you running on a certain version of the Z-Stack?
  • 0
    Genius 3415 points

    Hi The Seven,

    The maximum ruining time is obtained  with WDTIMX. Do you want to have the watchdog timer only after the application is running? in that case you need to implement a timer in the application that refresh the timer:

    // In the app_event_loop

     if ( events & SAMPLEAPP_WD_REFRESH_EVT )

     {

       WatchDogEnable( WDTIMX );

       osal_start_timerEx(YourApp_TaskID, SAMPLEAPP_WD_REFRESH_EVT , 1000);

       return ( events ^ SAMPLEAPP_END_DEVICE_REJOIN_EVT );

     }

    Then just trigger the event at the end of the App_Init() with osal_set_event( YourApp_TaskID, SAMPLEAPP_WD_REFRESH_EVT  ). The WatchDogEnable() will give you a time equal to clock period × 32,768 (~1 s) when running the 32-kHz with WDTIMX so, the timer will refresh the watchdog just before it expires.

     

    I hope this helps.

     

    Regards,

  • 0 in reply to Jose Maria Alvarez
    Guru 11440 points

    Hi  Jose Maria Alvarez

         thanks  for your reply !

         if  my device power support by battery, should  i stop SAMPLEAPP_WD_REFRESH_EVT  when it go into sleep ?

    BR! 

  • 0 in reply to The Seven
    Genius 3415 points

    Hi The Seven,

    The source clock for the watchdog is enabled in the sleep mode so the SAMPLEAPP_WD_REFRESH_EVT must be runing in order to feed the dog wich means that the microcontroller will be waking up on each SAMPLEAPP_WD_REFRESH_EVT  timeot. Remember to enable the ISR_KEYINTERRUPT compilation flag in order to avoid the key polling event.

    Regards,