Can't flash nRF52840. Unable to connect to a debugger.

RE: Can't flash nRF52840. Unable to connect to a debugger.

Simonr — Thu, 06 Jun 2024 06:16:20 GMT

Hi, check out the circuit board guidelines or the QFN soldering reflow guidelines whitepapers available here.

Best regards,

Simon

RE: Can't flash nRF52840. Unable to connect to a debugger.

AlexanderOhm — Tue, 04 Jun 2024 11:07:44 GMT

We just got an x-ray of the board and can confirm there were soldering issues. Thanks!

Perhaps it's an Ezurio/Laird question, but are there any tips and tricks re. soldering the BL654 module? This is the second board house we've used that has issues. I can't find anything in the datasheet besides the reflow heat profile.

RE: Can't flash nRF52840. Unable to connect to a debugger.

Simonr — Tue, 04 Jun 2024 10:02:45 GMT

So now it is only one nRF52840 custom board that is having this issue, correct? The log file only shows generic "unknown" errors unfortunately which usually points to the target not being powered correctly, so my initial guess would be that either the nRF52840 is incorrectly soldered on or that it is a faulty device. What J-Link device exactly are you using for programming these boards, and what voltage are the boards powered with here?

Best regards,

Simon

RE: Can't flash nRF52840. Unable to connect to a debugger.

AlexanderOhm — Tue, 04 Jun 2024 05:18:56 GMT

Edited to add the actual log file.