Automated nRF5284 DFU via USB using python

[Robin D.]

Hello,

I am trying to write a python script that performs a DFU on a nRF52840 so I can change its firmware without pressing any button. I think I have to use the pyusb module to be able to communicate with my nRF52840 and trigger its bootloader mode (I also heard about the DFU trigger library but I don't know if I can use it in python). Am I on the right way ?

My issue is an error I encounter and I am not able to resolve : "usb.core.NoBackendError: No backend available". I installed libusb (with pip) and my nRF52840 is connected to my computer. I work on WSL (Ubuntu). Do anyone know what's wrong here ?

Thanks,

Robin

[Turbo J]

Try running Linux host somehow (e.g. via boot from USB stick). Windows and Linux have VERY different ideas about USB drivers, and mixing them will be a nightmare.

There is documentation that describes how to connect USB devices to WSL, but that stuff seems off topic here.

[Robin D.]

small precision : I use WSL1 (it seems that it is easier to manage USB connection with it than with WSL2)

And I tried executing my script directly on Windows and had the same result.

[Hieu]

Hi Robin,

If you have the same issue on native Window, then you might have the same issue discussed in the first half of this case:  RE: custom nRF5340 board no bluetooth signal .

Could you please refer to the answer I link and see if that is the case?

Hieu

[PjGlasso]

Hi there,

The trigger library is meant for the dongle, you can Build/compile with it in your program to do some DFU ,bootloader tricks.

exactly what you want, your python automation would handshake with the dongle to set DFU mode , Upload the new code and it would reset on completion, other options can make it stop and wait on reboot for a do over or boot the app.

HTH

GL :-) PJ :v: