Facing hang in Zephyr wifi library and watchdog reset not occurred that instances

[Shanmugam]

Hi,

We have enabled the watchdog feature in our application running on the nRF5340 and nRF7002. In rare cases, we’ve observed that the nRF5340 hangs during Wi-Fi library operations, and in such instances, the watchdog reset does not trigger. However, if a hang occurs within our application code, the watchdog reset works as expected.

[Håkon Alseth]

Hi,

 

In rare cases, we’ve observed that the nRF5340 hangs during Wi-Fi library operations, and in such instances, the watchdog reset does not trigger.

This indicates that the scenario is yielding to the thread where you reload the watchdog.

Could you share a bit more information about your application?

Q1: What NCS version are you using?

Q2: Do you have "RPU Recovery" enabled? This is a feature that resets the nRF7002 in case it does not respond over (Q)SPI.

To enable the RPU recovery (available from v2.5-branch/v2.6.2 and forward), you need to enable this kconfig:

https://docs.nordicsemi.com/bundle/ncs-2.6.2/page/nrf/drivers/wifi/nrf700x/nrf700x.html#cmdoption-arg-CONFIG_NRF_WIFI_RPU_RECOVERY

 

And implement the Wi-Fi Ready library + handle the events in the application itself:

https://docs.nordicsemi.com/bundle/ncs-2.6.2/page/nrf/libraries/networking/wifi_ready.html

 

An example of such an handling is implemented in the wifi/sta sample:

https://docs.nordicsemi.com/bundle/ncs-2.6.2/page/nrf/samples/wifi/sta/README.html#rpu_recovery

See the implementations guarded with "CONFIG_WIFI_READY_LIB" here:

https://github.com/nrfconnect/sdk-nrf/blob/v2.5-branch/samples/wifi/sta/src/main.c#L56

  

Kind regards,

Håkon