Does the WDT TIMEOUT event cause NVIC_SystemReset?

[ibrahim upright]

Hi ,

I am using NRF52832 ,SDK15 my code is based on the HR_FreeRtos project , I am using the nrfx_wdt API to implement WDT in my code .

I am using a LDO for the voltage regulation in the circuit ,when the TIMEOUT event happens the device crashes instead of restarting ,( I know that NVIC_SystemReset can cause this crash and we don't use it in our code).

As part of debugging it , i added a delay (500ms) in the event handler function and caused TIMEOUT event by inserting while(1) without feeding the WDT , the event handler function doesn't continue to do the rest of the function and a crash after the delay.

Does the TIMEOUT event also cause a NVIC_SystemReset ?

Do you have any idea what cause this kind of behavior ?

Thanks a lot 

Ibrahim

[Jared]

Hi,

Could you share code that reproduces the error? I would like to reproduce it myself.

regards

Jared 

[ibrahim upright]

Thank you ,

I think i found the problem 

40.3 Watchdog reset Datasheet: -https://infocenter.nordicsemi.com/pdf/nRF52832_PS_v1.4.pdf

"the watchdog reset will be postponed with two 32.768 kHz clock cycles after the TIMEOUT event has been generated"

Is there any way to delay the reset more than Two 32.768 kHz ?

Thanks a lot

Ibrahim

[Jared]

Hi Ibrahim,

Unfortunately, it's not possible to delay the reset with more than two 32.768 kHz clock cycles once the TIMEOUT event has been generated and interrupt is enabled. 

regards

Jared