nRF52840 Preview DK program custom board issue

RE: nRF52840 Preview DK program custom board issue

kobyfr — Sat, 04 Mar 2023 18:09:50 GMT

that's it.

RE: nRF52840 Preview DK program custom board issue

Håkon Alseth — Thu, 26 Apr 2018 10:30:25 GMT

The SW9 when in position "USB", tells the system that the nRF shall be powered from the USB port ("nRF USB" J3), as described here.

If you want to debug and have USB connected on your external board, I recommend doing it like you're doing now, and connect an additional USB cable to your custom board.

Best regards,

Håkon

RE: nRF52840 Preview DK program custom board issue

adragocelestica — Wed, 25 Apr 2018 06:19:11 GMT

Hi,

That was it, now I am finally able to download my code to my board. I wonder if now I can do this while powering my board from the USB connector on my board. I see the interruptor SW9, with the USB option, and I would like to try to put it to USB and then connect my board to the USB, while connected to the evaluation board, and debug the functionality of my code. Would that be correct, or it would break something? If not, how can i do that? Thank you very much.

RE: nRF52840 Preview DK program custom board issue

Håkon Alseth — Tue, 24 Apr 2018 12:31:19 GMT

Hi,

By shorting SB47, you are permanently applying power to header P19, not header P20.

In order to use P20, you need to revert this short on SB47.

The logical switch on P20 is the "VTG" pin. If you short this with the neighboring pin "VDD_NRF", you will enable P20 (but first; revert the above mention SB).

Best regards,

Håkon