Cannot use SWD to communicate with nRF52832 BK board

[cdugue]

Hi everyone,

I recently acquired a nRF52832 Breakout Board from Sparkfun. I have been using it for a few weeks now and everything was fine. I was programming it using the SWD interface through a Nordic Semiconductor Preview Development Kit (nRF52840). However, without any apparent reason, I cannot communicate with the BK board through SWD anymore. This happened since the blue LED (pin 27 low) stays on whenever I power up the board and stays on after that. I have an LED assigned to pin 30 and it stays on also, meaning that pin 30 stays high for an unknown reason as the software I flashed previously did not do that. Am I stuck in a special mode like bootloader or DFU?

Any idea what could be the problem?

Thanks!

[Matt]

Can you try with another breakout board?

[Nguyen Hoan Hoang]

Can you try to erase all to see if you can recover from it.

[cdugue]

Matt, I do not have another breakout board just now, should have another one soon.

Nguyen, I tried to erase all but I cannot. Here is the log:

FUNCTION: read_device_version.

JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -1.

JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -102.

FUNCTION: close_dll.

[Nguyen Hoan Hoang]

It might be protected. I don't use nrfjprog but I know there is a command parameter for unlocking. You may try that.

[Bjørn Kvaale]

@cdugue This devzone case seems quite similar. This case might also be helpful. Seems like it could be a HW error in your breakout board or it might be that the battery level is too low if you are powering your board via batteries. Also seems that the JLinkARM.dll errors -1 & -102 are generic error codes & Segger documentation does not offer any specific explanation to why these errors have occurred. Might also be an idea to talk to sparkfun support & see if they have any tips.