nrf5340: Production programming DFU

[Harsh Jain`]

Hi, I am working on the nRF5340, We will be using the nRF5340 for the device that we are designing. 

How to do the very first production DFU/First firmware upload,.

I am not sure how to do the production based nrF5340(which is bare metal, not having any development kit sort of hw) update. I want to do firmware upgrade from another MCU/SoC using the UART interface.

There is nothing I am able to find from the datasheets or any other blogs, where it is mentioned that how to flash first firmware for production in bare metal nRF5340? 

  

[Kazi Afroza Sultana]

Hello,

Initial programming of the IC must be done through the debug interface as there is no pre-programmed bootloader on the device. If you want to add UART DFU capabilities, you need to create an application which supports this, and flash that program(.hex) to the nrf5340 with a programmer/debugger, e.g Jlink.

Here is a guide you can look at how to add DFU support to an application: https://devzone.nordicsemi.com/guides/nrf-connect-sdk-guides/b/software/posts/ncs-dfu.

Thanks.

BR

Kazi