CC2652R: watchdog callback

Walter Macamos

Part Number: CC2652R

Hi TI Team,

In the example above, when is watchdog callback called? What is the purpose of setting to while(1).

void watchdogCallback(uintptr_t watchdogHandle)
{
/*
* If the Watchdog Non-Maskable Interrupt (NMI) is called,
* loop until the device resets. Some devices will invoke
* this callback upon watchdog expiration while others will
* reset. See the device specific watchdog driver documentation
* for your device.
*/
while (1) {}
}

Regards,

Walter

over 5 years ago

0 IUsedToBeARealPerson (M-W) over 5 years ago

TI__Guru 58425 points

Hi,

The callback would be called when the Watchdog expire. In this case, it would block the device until the watchdog expires for the second time, at that point the hardware will reset. i would assume they simply want to make sure the device reset following a watchdog timeout.

0 Walter Macamos over 5 years ago in reply to IUsedToBeARealPerson (M-W)

Genius 5345 points

Hi Marlyn,

Thanks.

So, this is correct watchdog expiration call to make sure device hangs.

Is watchdog timer will work if ZED with poll rate =0 (standby mode). The cc2652 data sheet says WDT paused during standby mode.

Regards,

Walter

0 Ryan Brown1 over 5 years ago in reply to Walter Macamos

TI__Guru**** 218697 points

The WDT is sourced by INFRASTRUCTURE clock, which also sources the wake-up interrupt controller and would be active in sleep mode. I'm not certain what the comment from the CC2652R Datasheet is meant to say.

Regards,
Ryan

0 IUsedToBeARealPerson (M-W) over 5 years ago in reply to Ryan Brown1

TI__Guru 58425 points

Hi Walter,

The datasheet is correct in this regard. The watchdog is driven by the peripheral clock and will as a result "pause" when the device is put into standby as these clocks are turned off.

If this "hang in callback" is the right call or not for your application, i cannot answer. What you want to do in the callback depends very much on what you are trying to achieve.

0 Walter Macamos over 5 years ago in reply to IUsedToBeARealPerson (M-W)

Genius 5345 points

Hi Ryan,

OK, so the WDT interrupt will be active when poll rate is zero.

Hi Marlyn,

Our worry is when watchdog interrupt callback is called it will hang instead of calling system reset.

Regards,

Walter

0 IUsedToBeARealPerson (M-W) over 5 years ago in reply to Walter Macamos

TI__Guru 58425 points

Hi Walter

M-W <- Not a Marlyn :)

The callback being stalled should not prevent your application from resetting. The way the watchdog operates is that on the first timeout, you get the interrupt. You can choose to take action, or not. When the second timeout comes, and the watchdog still remained unattended, a system reset will be forced.

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CC2652R: watchdog callback