JLink USB is suddenly not detected in nRF52833/nRF9160 DK

[choehyunho]

Hi teams,

Recently, I upgraded JLink driver to 7.5x and suddenly all of my nRF DK boards are not detected via USB.

All of my 4 DKs shows the same symptom. LED5 near JLink FPGA chip is fast blinking continuously.

But, in device manager in Windows 10, there is no USB device is shown (even the yellow banged mis-detected/mis-configured device is not exist).

But still, my other SEGGER Jlink Base is working.

How can I fix this?

[Albrecht Markus Schellenberger]

Thanks a lot for the feedback!

choehyunho said:

And, with further testing, this only happens when I connect DK on external USB hub.

I’m honestly a little bit unsure if this has something to do with the J-Link driver. Because when powering on your DK’s, you should at least get a COM-port in the Device Manager (which then probably wouldn’t be recognised as such when no J-Link drivers are installed).

choehyunho said:

Strange thing is that in the previous JLink version, there was no problem even it was connected via hub.

Should I ask question to Segger company?

The DK’s I’m using myself are as well connected to an USB hub, but this one has external power supply. Switching that off, I lose connection to my board(s). So my wage guess here would be that this might be a problem with the USB hub itself.

Regards,

Markus

[choehyunho]

Mostly agree to you.

The JLink device driver installed to PC is not related to this problem.

DK board just blinks LED fast only, as if it is not connected to USB port at all.

I think even the USB device enumeration is not progress at all.

The strange point is that I use several USB-serial ports and JLink devices at the same USB hub, including 2 JLink Base debuggers and even the similar DK from other H/W vendor (Dialog).

All these boards are work fine, only my several 52833 DKs, and 9160 DK is not working on this hub.

Any idea or suggestion?