DFU using USB mass storage on nrf52840

[Jason]

My product has nrf52840 with usb mass storage configured using 8MB QSPI flash (same chip as the nrf52840dk - MX25R64)

I would like to allow users to upgrade firmware by dropping files onto the usb mass storage flash disk. 

Is there an example for nrf52840? I can't find it.

I read this conversation which looks relevant, but it relates to the nrf5340 -  DFU using USB file system (not serial emulation)?  

I believe there is an nrf52840 UF2 bootloader from adafruit, I've not tried to use it yet. I would prefer to use the nordic recommended approach.

I found this guide to using external flash for DFU, but it doesn't update using USB mass storage. https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-9-bootloaders-and-dfu-fota/topic/exercise-3-dfu-with-external-flash/

Any advice is greatly appreciated.

I'm currently NCS 2.6.0, but could update if required.

Kind regards,

-Jason

ps. how do I get a project Id?

[Menon]

Hello,

Is there an example for nrf52840? I can't find it.

There is no official sample showcasing USB Mass Storage DFU. However, there are some examples using USB CDC ACM, which provides a serial port over USB, similar to a USB-to-serial adapter, but not like a USB flash drive. See the USB Device Support section for more details.

I believe there is an nrf52840 UF2 bootloader from adafruit, I've not tried to use it yet. I would prefer to use the nordic recommended approach.

This is true and an approachable method. UF2 is a USB Mass Storage-based bootloader, where you can simply drop .uf2 files onto a drive that appears as a USB mass storage device. I have not personally tried this, and it is not officially supported, as it is not based on MCUboot. You can find more information about this here.

Kind Regards,

Abhijith

[Jason]

thank you!

Sometimes it's not easy to find the right example, so it's best to ask.

I will work on a solution based on the code from the devzone post and I will try to remember to update this page with the nrf52840 solution (in case it's useful to anyone)

Kind regards

-Jason