nrfjprog error 33 with Adafruit Feather

RE: nrfjprog error 33 with Adafruit Feather

Simonr — Mon, 10 May 2021 07:20:39 GMT

Can you try erasing this older J-Link version (v620i) from the computer? I'm guessing there are some conflicts between these two J-Link versions. If that doesn't help, I think you'll have to try uninstalling J-Link and nrfjprog entirely before reinstalling both if you haven't tried that already.

Best regards,

Simon

RE: nrfjprog error 33 with Adafruit Feather

epower — Fri, 07 May 2021 16:29:21 GMT

Oh, and this problem is specific to this computer. I successfully programmed the same feather board with the same dev board on a different computer.

RE: nrfjprog error 33 with Adafruit Feather

epower — Fri, 07 May 2021 16:10:59 GMT

I made sure all IDEs and other things that might be talking to the debugger were closed and I got the same error.

If I go to the windows control panel, select "Apps & features" and search for "j-link" it shows that "J-Link V620i" and "J-Link V688a" are both installed. That seems a little suspicious. I currently have nrfjprog v9.7.2 installed, but I've also tried v10.12.1.

RE: nrfjprog error 33 with Adafruit Feather

Simonr — Fri, 07 May 2021 12:28:28 GMT

Thank you for clarifying. As there was no mention of it I just assumed that might be it, as it is an astonishingly common issue. When error 33 has been seen in the past it's been due to different reasons, what JLink version do you have installed on your computer, do you only see this issue on this specific computer? Can you make sure that an active debug session in I.E. SES is not active while you're using nrfjprog or that a J-Link Viewer is running. Try making sure that SES or any other IDE is closed when running these commands.

Best regards,

Simon

RE: nrfjprog error 33 with Adafruit Feather

epower — Thu, 06 May 2021 18:57:35 GMT

I guess I should clarify. I am seeing this problem when the target board is powered.

RE: nrfjprog error 33 with Adafruit Feather

epower — Thu, 06 May 2021 15:48:32 GMT

Thanks Simon. I am powering the feather board through USB. It has an internal regulator to derive 3V from USB power.

RE: nrfjprog error 33 with Adafruit Feather

Simonr — Thu, 06 May 2021 11:38:26 GMT

Please note that the debug pin header (2x5) P19 is not able to power the external board, so you will have to power these Adafruit Feather boards somehow, how are you doing this? When an external board is powered, the interface MCU will detect the supply voltage of the board and program the taget chip instead of the onboard one. Please note that the voltage supported by external debugging/programming is 3.0V. See section 6.10 in the DK User guide for reference.

Best regards,

Simon