nrf52840 on custom board won't run without jlink debugger

[nikola]

I am trying to run nrf52840 chip without debugger.

I want to run peripheral_uart example just to show advertising of bluetooth.

And when I use west debug --runner=jlink , it works, and just by applying power on chip, it doesn't advertise bluetooth.

There is no 32kHz oscillator on board so I use CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y.

I don't have any pins available to probe whether is chip working or not without debugger.

Also chip programs only with 4kHz clock via JLink, it just doesn't work on 4000kHz, it is weird issue.

Also chip is acting weird and resets on k_sleep instruction.

[Jared]

Hi,

Do you have an external DC-DC filter? The examples by default uses the external DC-DC filter. I would expect the application to stall if the filter isn't present. Could you try what is purposed in this similar thread.

regards

Jared 

[nikola]

Thank you so much, that worked, it is advertising now without debugger.

[Jared]

Good!