CC2530: WDT in END device not cleared

Aviral Gupta

Part Number: CC2530

Hi,

We are trying to implement the Watchdog timer in the end device code (ZStack 3.0.1).

We are using

WatchDogEnable( WDTIMX );

to enable the watchdog timer in main function

and for clearing the counter we are doing the following:

in Osal_run_system() after every task.

    activeTaskID = idx;
    events = (tasksArr[idx])( idx, events );
    activeTaskID = TASK_NO_TASK;
    
    WDCTL |= (0xA0); <--------added
    WDCTL ^= (0xF0);<--------added

Problem: It is getting reset because of watchdog timer.

Questions:

1) Is this the correct way and place to clear the WD counter?

2) Where can we see the WDT counter value (Which register)?

3) Does Operating the device in debug mode with breakpoints cause the WDT to expire?

over 7 years ago

0 YiKai Chen over 7 years ago

Guru 735695 points

You have to start a periodic timer event to wakeup CC2530 to kick watchdog.

0 Aviral Gupta over 7 years ago in reply to YiKai Chen

Expert 1385 points

so do you mean watch dog timer is running even in sleep mode(Power mode 3)?

0 YiKai Chen over 7 years ago in reply to Aviral Gupta

Guru 735695 points

No but it's running in PM2.

0 Aviral Gupta over 7 years ago in reply to YiKai Chen

Expert 1385 points

So are you suggesting to do:

WatchDogEnable( WDTIMX );
osal_start_reload_timer( zclSampleLight_TaskID, WDT_CLEAR_EVENT, 500000);

in main

and then

  if(events & WDT_CLEAR_EVENT)
  {
    WDCTL |= (0xA0);
    WDCTL ^= (0xF0);
    return (events ^ WDT_CLEAR_EVENT);
  }

in Sample light event loop?

Can you confirm the answers to the questions in the first post?

0 YiKai Chen over 7 years ago in reply to Aviral Gupta

Guru 735695 points

Yes, you can do that in Sample light event loop.

0 Aviral Gupta over 7 years ago in reply to YiKai Chen

Expert 1385 points

it doesn't work. Is the code correct for resetting the WD counter?

0 YiKai Chen over 7 years ago in reply to Aviral Gupta

Guru 735695 points

You should use the following code to clear watchdog.
if(events & WDT_CLEAR_EVENT)
{
WDCTL = 0xa0;
WDCTL = 0x50;
return (events ^ WDT_CLEAR_EVENT);
}

0 Aviral Gupta over 7 years ago in reply to YiKai Chen

Expert 1385 points

Hi Yikai,

that worked, we were not resetting the WDT counter correctly.

we have placed this WDT clear sequence in the osal_run_system(), thanks.

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CC2530: WDT in END device not cleared