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]

Hello,

choehyunho said:

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

Are you using several devices connected to the USB hub at the same time or does this also happen if only one of the nRF52833/nRF9160 DKs is powered-up?

choehyunho said:

Any idea or suggestion?

I wonder if this has anything to do with voltage drops that our DKs can’t handle? Do you have the possibility to test this with another USB hub?

By the way: I will be on vacation for the next couple of weeks. If you need any more support concerning this issue, I recommend you to create a new case referring to this one. One of my colleagues will help you then.

Regards,

Markus

[choehyunho]

To verify USB hub problem, I removed all connected devices and clean up enumerations from my desktop.

After re-enumerating devices one by one, I confirmed nRF DKs are detected properly.

I will try to monitor whether similar problem happens again, but for now, the problem is caused by hub, not DK board.

I'll leave results if further issue exists.

Thank you.