DFU over UART serial recovery

[thang47]

I need to work on single bank DFU from esp32 to nrf52833. I found a website with instructions on single bank configuration here: academy.nordicsemi.com/.../topic /exercise-1-dfu-over-uart/. I have configured the nrf52833 in serial recovery mode.
In that site use "mcumgr" to dfu down DK nrf52833. But I want to use my esp32 to DFU down to nrf52833, is there any way?

[AHaug]

Hi,

We have this sample showcasing how to perform FOTA from one MCU to another external MCU nRF Connect SDK FOTA External MCU Sample. 

Additionally, to get a deeper understanding of how this works and to use it in your application, you should explore the smp client source code within the nRF Connect SDK. This code provides valuable insights into the SMP client implementation and can guide you in integrating this functionality into your own projects.

Kind regards,
Andreas

[thang47]

Thanks for your answer.

I have a porblem with DFU over USB or DFU over UART. Can I use USB or UART to both communicate and DFU? Or just 1 of 2.

[AHaug]

Hi, 

You can use either of them interchangeable, but not simultaneously, meaning that you can change between what you use the UART for depending on the mode of operation you're within.

So for instance you can use UART as "regular communication" when you're using it in the app for communication, and you can use it for DFU Image transport when you're in DFU mode.

https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-8-bootloaders-and-dfu-fota/ explains this to some extent

Kind regards,
Andreas

[thang47]

Hi Andreas, thanks for your answer.

But as for DFU via USB, I don't see any soft configuration so the program can enter DFU.
I want my program to communicate via USB and when I use a command or function it will enter DFU mode.

[AHaug]

Hi,

You can have a look at https://github.com/nrfconnect/sdk-mcuboot/blob/v2.0.99-ncs1/boot/zephyr/Kconfig.serial_recovery#L133. 

Kind regards,
Andreas