RE: Unable to run Zephyr programs on nRF52840DK.

chrisswinchatt — Thu, 03 Jun 2021 11:31:38 GMT

Hi Simon,

I am using upstream Zephyr. The above commands do work. I was evidently using the wrong board spec in the build. A pristine build with the correct spec & JLink firmware fixes the issue. Thanks.

RE: Unable to run Zephyr programs on nRF52840DK.

Simon — Thu, 03 Jun 2021 10:56:37 GMT

Are you using NCS (which contains a downstream Zephyr version) or upstream Zephyr?

Can you try the following and report if it works or not?

'west flash' command
- cd <ncs location>/zephyr/samples/basic/blinky
- Connect nrf52840 DK to computer and turn on iton
- west build -b nrf52840dk_nrf52840 && west flash
  - Now LED1 should blink
- 'nrfjprog --program' command
  - cd <ncs location>/zephyr/samples/basic/blinky/build/zephyr
  - nrfjprog --eraseall
    - Make sure LED1 stops blinking
  - nrfjprog --program zephyr.hex --sectorerase
  - nrfjprog --reset
    - Now LED1 should blink

Best regards,

Simon