Unable to Flash nRF52832 Using nRF52840DK using nRF Programmer: Error Code -1 (Failed to Write DebugPort Register)

RE: Unable to Flash nRF52832 Using nRF52840DK using nRF Programmer: Error Code -1 (Failed to Write DebugPort Register)

Vidar Berg — Tue, 18 Mar 2025 13:08:22 GMT

Thank you for providing the log. Not surprisingly, the log shows that communication between the debugger and the nrf is failing. This is often an indication of a connection issue or mismatched IO voltages between the debugger and the target. Or that he target may not be properly powered.

Do you have a voltmeter you can use to measure the VDD voltage on the nRF52840 DK and voltage on the SWDIO line from the 52832 target (when *not* connected to the debugger)?

RE: Unable to Flash nRF52832 Using nRF52840DK using nRF Programmer: Error Code -1 (Failed to Write DebugPort Register)

xutengl — Thu, 13 Mar 2025 21:11:00 GMT

devzone.nordicsemi.com/.../1104.log.log

RE: Unable to Flash nRF52832 Using nRF52840DK using nRF Programmer: Error Code -1 (Failed to Write DebugPort Register)

Vidar Berg — Thu, 13 Mar 2025 16:08:18 GMT

This command should have created a file name log.log in your current directory (C:\Users\xl). Can you please post that file here?

RE: Unable to Flash nRF52832 Using nRF52840DK using nRF Programmer: Error Code -1 (Failed to Write DebugPort Register)

xutengl — Thu, 13 Mar 2025 10:57:10 GMT

C:\Users\xl>nrfjprog --recover --log
[error] [ Worker] - An unknown error.
[error] [ Client] - Encountered error -102: Command connect_to_emu_with_snr executed for 218 milliseconds with result -102
ERROR: Unable to connect to a debugger.
ERROR: JLinkARM DLL reported an error. Try again. If error condition
ERROR: persists, run the same command again with argument --log, contact Nordic
ERROR: Semiconductor and provide the generated log.log file to them.

RE: Unable to Flash nRF52832 Using nRF52840DK using nRF Programmer: Error Code -1 (Failed to Write DebugPort Register)

Vidar Berg — Mon, 10 Mar 2025 14:07:55 GMT

Hi,

Thanks for confirming that SWO_SEL is tied to ground.

[quote user=""]nrfjprog --recover -f NRF52 --snr 1050264751 resulted in error -21.[/quote]

This looks like an uncommon error code to be returned from nrfjprog.

(https://docs.nordicsemi.com/bundle/ug_nrf_cltools/page/UG/cltools/nrf_nrfjprogexe_return_codes.html)

Please run "nrfjprog --recover --log" and post the log file here.

Best regards,

Vidar

RE: Unable to Flash nRF52832 Using nRF52840DK using nRF Programmer: Error Code -1 (Failed to Write DebugPort Register)

xutengl — Mon, 10 Mar 2025 05:11:27 GMT

Hi Vidar

In case 339001, I realised that the SWO_SEL pin must be tied to GND, which is still tied to GND. The solder bridge SB19 is still connected, proving voltage reference to the DK.

I also verified the power supply to the custom board is 3.3V, and all SWD pins are securely connected.

Is there anywhere else I should look into?

RE: Unable to Flash nRF52832 Using nRF52840DK using nRF Programmer: Error Code -1 (Failed to Write DebugPort Register)

xutengl — Mon, 10 Mar 2025 05:04:49 GMT

Hi, Thanks for your response, but I cannot find a current measurement header on my nrf52840DK: https://www.nordicsemi.com/Products/Development-hardware/nRF52840-DK/Download

RE: Unable to Flash nRF52832 Using nRF52840DK using nRF Programmer: Error Code -1 (Failed to Write DebugPort Register)

Vidar Berg — Fri, 07 Mar 2025 15:01:35 GMT

Hello,

The errors indicate that there may be some connectivity issue between the DK and your custom board preventing the debug probe from communicating with the target . There could also be mismatching IO voltages that causes the communication to fail. Is the SWD0_SEL pin still tied to GND?

Best regards,

Vidar

RE: Unable to Flash nRF52832 Using nRF52840DK using nRF Programmer: Error Code -1 (Failed to Write DebugPort Register)

RaymondMango — Fri, 07 Mar 2025 09:18:16 GMT

Hi, make sure the jumper on the nRF Current Measurement header is in place. I had the same issue thats what I did