nRF52840 SDK v15 - usbd_ble_uart debug mode issue

[Atlas]

Hi

I tried SDK v15 sample code - "usbd_ble_uart" on nRF52840-DK.

After programming & plug-in USB cable on J3, I can see there are two com port on the device manager.

One is J-Link Com Port (ex : COM1) and another is NRF52 USB CDC BLE Demo (ex :COM2).

But when I run debug mode on Keil C & nRF52840-DK, NRF52 USB CDC BLE Demo (ex :COM2) will disappear.

Why?  

Please advise.

Thanks.

Atlas

[Joakim Jakobsen]

Hi!

Maybe you could tell me which nRF52840 IC revision or PDK version you are testing this on?

IC revisions compability with development HW

Best regards,
Joakim.

[Atlas]

Hi Joakim

nRF52840-DK and nRF52840 C0

Thanks.

BR

Atlas

[Joakim Jakobsen]

Thanks!

What is most likely happening, is that the link breaks as you start the debug session.

Could you try starting debug mode, and then connect the usb after the debug session is started and see the NRF52 USB CDC BLE Demo will appear?

 

Cheers,
Joakim.

[Atlas]

Hi Joakim

I followed your suggestion to test then it works.

Thanks.

BR

Atlas

[Joakim Jakobsen]

I'm glad to hear that!

Be sure to let us know if you face any other issues.

Best regards,
Joakim.