Dongles getting bricked after PC restart

[Mike Mazowski]

Hi,

I use dongles with custom application that combines Thread and CDC ACM. The application works fine, but after restarting PC several dongles with this application stopped working.

I can still enter bootloader mode by pressing reset button and can still successfully flash default nRF Connect BLE software.

With my application, when dongle is plugged in, it is no longer detected as CDC ACM port, all LEDs seem to blink periodically for a fraction of a second, but are very dim.

Is there a way to revive these dongles?

Awaiting Yours.

[Jørgen Holmefjord]

Hi,

If you are able to flash the dongle, it's not "bricked". Sounds like there is some issue with enumerating the device on the PC. Have you tested it on multiple PCs?

Which OS are you running?

The application might detect an error and put the device in error handler (which again would reset the device if DEBUG flag is not set).

Best regards,
Jørgen

[Mike Mazowski]

Hi,

Yes, I tried it on multiple PCs, it is not working on multiple PCs in a similar manner. I am running windows 10.

Could this be caused by PC application not having closed the COM port before plugging out/restarting?

[Jørgen Holmefjord]

It could be related. Are you able to get the application working again by plugging the dongle out and in again?

Can you provide the application that you are running for us to try to reproduce the issue?

[Mike Mazowski]

No, after the issue occurs for the first time I was not able to get it to successfully run the application again.

The application for Dongle is attached as archive.

Project located under "examples\thread\cli\usb_bootloader - OG\pca10056\blank\ses".

[Jørgen Holmefjord]

I'm not able to reproduce this issue. Can you upload a precompiled hex-file that I can test with?