Unable to Program Custom nRF52840 Board Using SWD with nRF52840 DK v2.0.1

RE: Unable to Program Custom nRF52840 Board Using SWD with nRF52840 DK v2.0.1

sdfksdfhfs — Tue, 08 Apr 2025 15:05:51 GMT

I have tried "nrfjprog --recover" before but that didn't help, after adding "-f nrf52" to that command, now everything is good. Thanks a lot for help!

Best regards

RE: Unable to Program Custom nRF52840 Board Using SWD with nRF52840 DK v2.0.1

Håkon Alseth — Tue, 08 Apr 2025 06:31:01 GMT

Hi,

Can you please run "nrfjprog --recover -f nrf52 --log" and attach the .log file if this operation fails?

Kind regards,

Håkon

RE: Unable to Program Custom nRF52840 Board Using SWD with nRF52840 DK v2.0.1

sdfksdfhfs — Mon, 07 Apr 2025 15:21:53 GMT

Hi,

when I disconnected VTG pin, you can see that nrf52840dk is shown:

After I connect VTG pin to VDDnrf on DK, this is what I get(revision number not shown) :

Btw, when connecting with external board, this is what is shown on nrf programmer:

Does this help you? What else do you want me to check? Thanks.

Kind regards

RE: Unable to Program Custom nRF52840 Board Using SWD with nRF52840 DK v2.0.1

Håkon Alseth — Mon, 07 Apr 2025 14:16:29 GMT

Hi,

[quote user=""]

VDD : I have connected the DK’s VDD to the custom board’s VDD.
VTG: I have connected the DK’s VTG pin to the DK's VDD.
SWDIO: Connected DK’s SWDIO to the custom board’s SWDIO pin.
SWCLK: Connected DK’s SWCLK to the custom board’s SWCLK pin.
GND: Connected DK’s GND to the custom board’s GND.
GND Detect: Connected the DK’s GND_DETECT pin to GND on the custom board.

[/quote]

When VTG on the DK is shorted to NRF_VDD, the on-board-debugger (ODB) will switch to the header in question for programming.

Ie. if you only connect VTG -> VDD, the communication should fail.

This will then be a test to see that the interface has been switched.

Could you share any logs or similar when using nrfjprog? This can be done by appending --log to the operation.

Kind regards,

Håkon