promicro blinky

[BvdPdebilt]

Hi, I created a blinky sample for the ProMicro board. Entered the flash mode as mentioned in https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/boards/others/promicro_nrf52840/doc/index.html But when dragging the uf2 file into the NICENANO drive, the red led will blink fast, no matter what I used as a SLEEP_TIME_MS. It looks like the application is crashing. What could be wrong?
I tried both with and without ONFIG_BOOTLOADER_MCUBOOT=n

Regards,
Bob

[sasith_ind]

Hi I have the same problem but unfortunately changing to No sysbuild doesn't fix it for me it seems. Do you have any suggestions?

[BvdPdebilt]

Hi, I took the blinky example from Zephyr, selected board promicro_nrf52840_nrf52840_uf2, created an overlay file with the led definition. I use nRF Connect SDK v3.0.1 and toolchain v3.0.2. In the buildconfiguration, I selected No sysbuild. Then pristine build.

Now a file 'build/zephyr/zephyr.uf2' is created. Get the Promicro in programming mode (activate 'reset' twice or use a new board). In Windows, you should see a drive called NICENANO. Drag and drop the zephyr.uf2 to that drive and the red led should blink (at least, at my board…)
Hope this helps.

[sasith_ind]

Okay I'll try, thank you