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,

Does this happen only on that single machine?

Just to make sure, it is the old nRF52 DK, not for example nRF52840 DK? Please also provide me with the DK version number.

What kind of errors do you get? Any screenshots?

What you could try doing is reflashing the J-Link Interface MCU firmware (as it is documented here) and see if that solves the issue.

Best regards,

Michal

[olgo]

I have the exact same problem. Jlink CDC UART Ports on both COM6 and COM7.

Tried on two different windows machines.

HW used is nRF52840 DK, version 3.0.3, serial 1050210048

Interestingly, I can still flash using segger embedded studio but nRF Sniffer does not work.

I can also not flash using the normal programmer nor rfGo Studio.

I downloaded j-link-ob-sam3u128-v2-nordicsemi-170724.bin and dropped it in the mounted drive but it does not update.

FAIL.TXT tells me that "The currently active SWD interface does not support MSD drag and drop"

[Michal]

Hi,

Please make a new ticket in the future.

Unfortunately, there are some issues with the nRF52840 v3.0.x, because of the new interface MCU chip. They use nRF5340, while the old DKs used a Microchip IC (sam3u128).

Which is also why you cannot flash the firmware made for the old interface MCU on the new one. The firmware for the new interface MCU is not available for download at the time.

I will ask the developers about the current status, but I know that there is an issue with nRF Sniffer and a few other things not working properly on the new DKs.

Best regards,

Michal

[olgo]

Sorry for stealing the ticket, just wanted to inform you all that it is a general problem.

Thanks for your input. Looking forward to hearing from you again in the matter.

/Ola