nRF52 reports two JLink CDC UART Ports

[PederOlav]

Hi

For some reasons my Windows 10 laptop reports two JLink CDC UART Ports when I connect one of my nRF52SDK boards.My plan is to use this board with nrf Sniffer / Wirshark, but that does not work when I have two ports for my nrf52DK.

Does anyone know how to fix this issue?

KInd regards

Peder Olav

[Michal]

Hello Peder Olav,

Thank you for all the information. Unfortunately the nRF52DK version 3.0.0 has an nRF chip as a debugger chip, which does not support the sniffer yet.

I will try to find out if there is any way or workaround to make the sniffer work, but for now the only solution is to use an older DK with the big debugger chip.

Best regards,

Michal

[Michal]

Hello again,

I have another solution, but it needs a DK with a chip that supports USB, so either nRF52833 or nRF52840 DK, but unfortunately not the nRF52 DK (with nRF52832). Another, cheaper option is to use the nRF52840 Dongle.

The solution is that you can use the nRF USB port. This is actually the recommended way to use the sniffer, as mentioned in the documentation. This way you can also get more data throughput.

The way you do this is by flashing the firmware normally first and then connecting the USB to the other USB port (nRF USB). You don't have to change the position of any switches for that.
nRF power source swtich is kept at VDD and nRF only switch at DEFAULT.

This way it should be possible to use a board in the sniffer even with the new J-Link chip.

Best regards,

Michal