New PCB with BT840 is stuck in k_cpu_atomic_idle(). Suggestions?

[abvio]

Hi Folks,

I am bringing up a new printed circuit board with a Fanstel BT840 (nRF52840). When I install any firmware, even Blinky, it simply gets stuck in k_cpu_atomic_idle. It never reaches a breakpoint set at main().

Both Blinky and my application run fine on a nRF52840 DK, and on the nRF52840 Dongle.

I have confirmed that my JTAG probe is able to install the firmware on the BT840 successfully. I've built two different boards to help assure it isn't a soldering issue. I've included the external crystal.

My questions:
- Any eureka comments that would explain why this is happening?
- Would this more likely be a hardware issue or a Zephyr configuration issue?
- If you were debugging this issue, what would be the next steps you would take?

Thanks for your help,

Steve

[Priyanka]

Hi Steve,

I've built two different boards to help assure it isn't a soldering issue.

Does this issue happen on both boards? 

Which SDK version are you working on?

Regards,

Priyanka

[abvio]

Hi Priyanka,

Yes, the issue happened with both boards.  I am using the v1.9.1 SDK.  

Thanks,

Steve

[Priyanka]

Hi Steve,

When you try the same sample (say, blinky) on the boards that you have build, it gets stuck but when you try this on the DKs or Dongle it works, right? Then it sounds like there might be some anomaly in the pcb you have build. Could you attach the schematic and layout of your pcb board?

-Priyanka