GPIO accessibility during OTA DFU

[Adarsh_1]

Hello Team,

I would like to know if the GPIO will be affected during an OTA DFU proceedure. I am using NCS V2.2.0. 

We have designed a custom board for nrf5340 audio application. For the power supply to function correctly, we need a GPIO to be pulled high. If the state of the GPIO changes during any time of the application, the regulated power supply connected to the nrf5340 SoC fails and resarts and repeat the same until the GPIO is pulled high. 

I would like to test the OTA DFU feature of the application. We have an external flash memory for this. Will not the application core be completely erased and reflashed during the DFU process? 

How can we make sure that the GPIO stays put in the high state for the entire duration of the application?

Thanks you in advance.

Best regards,

Adarsh 

[Menon]

Hello,

When you check the reset behavior of 5340(see the below image), the GPIO reset won't happen in wake up from system OFF.

So there is an option....  instead of doing softreset, you can prepare a GPIO pin so that it wakes up immediately from a System OFF. 

See product specification page No:67-69.

Kind Regards,

Abhijith