NRF52832 won't start

RE: NRF52832 won't start

nick_bike — Fri, 08 Jul 2022 08:22:01 GMT

As an extra answer; it appears that having the J-Link connected in any capacity disables the DCDC, or at least doesn't need it. Hence why it was working when connected.

RE: NRF52832 won't start

nick_bike — Fri, 08 Jul 2022 08:20:49 GMT

Thanks Jonathan. NRF 1.9.1. Your comments got me thinking about the DCDC and I've now fixed this problem by specifically disabling the DCDC. Excellent!

CONFIG_BOARD_ENABLE_DCDC is y by default and but needs one of a number of Nordic boards including NRF52DK_52832. The thing52 is not on the list; so the DCDC gets disabled on the Thingy52 (despite the Thingy52 having DCDC components.)

I checked my boards .config files and found CONFIG_BOARD_ENABLE_DCDC was disabled on the Thingy52 based build , hence why it worked.

Interesting gotcha for anyone making customer boards and not using the DCDC.

RE: NRF52832 won't start

JONATHAN LL — Fri, 08 Jul 2022 07:26:33 GMT

Hi,

Are you able to get the custom board to work with a simple example, like the blinky example with alle configs disabled, what SDK are you using?

Does the device have to be in debug-mode to work or is just having a powered J-Link connector enough to get det device working.

Can you share det schematic, it will be a quick way for me to see if there is anything that seems off.

See if your Software has both DCDC and the external LFXO disabled. If not then that will cause issues.

Regards,
Jonathan