nRF52840 dongle USB mass storage config for internal partitions

[Alex_MeT]

HI.

I am trying to implement the mass storage example (zephyr/samples/subsys/usb/mass in the 2.2.99 SDK) on the nRF52840 dongle for windows 10 but using an internal RAM partition as the storage location instead of an external QSPI flash device, is the possible and if so how would i go about doing this?



Thanks, Regards, Alex.

[Edvin]

Hello Alex,

Please check the sample description:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.5.2/zephyr/samples/subsys/usb/mass/README.html

I tested this using the build command:

west build -b nrf52840dongle_nrf52840 -d build -- -DCONFIG_APP_MSC_STORAGE_RAM=y

(or you can build in VS Code with CONFIG_APP_MSC_STORAGE_RAM=y added to prj.conf)

I flashed it using the nRF Connect for Desktop -> Programmer app, and then it popped up as a mass storage device. 

The CONFIG_APP_MSC_STORAGE_RAM config seems to do pretty much what you are trying to do. Give it a go, and let me know if it doesn't work.

Best regards,

Edvin

[Alex_MeT]

Thanks Edvin, works great.

Was even able to use internal flash with some modifications.

Regards, Alex.

[Jason]

Hello Alex, I need the same.

Would you mind sharing how you did this?

Did you modify the RAM driver to read/write Flash? Any problems that I should know about?

Thanks in advance,

-Jason