RE: Unable to Debug nRF52840 USB CDC ACM example.

matteo-0101 — Tue, 20 Mar 2018 20:38:25 GMT

Thanks Håkon for your fast response, yes I am using Engineering revision B.

I missed this in the errata but have implemented the suggested fix now and it gets past waiting for ready state and runs.

Thanks so much for the help!

RE: Unable to Debug nRF52840 USB CDC ACM example.

Håkon Alseth — Tue, 20 Mar 2018 08:40:40 GMT

Hi,

It sounds like you are using engineering revision B or C of the silicon.

One of the unfortunate issues with SDK v14.2 is that it does not include workarounds for revision B and C of the nRF52840 engineering samples, so you will have to add them manually.

I suspect that you are running into this errata:

USB cannot be enabled

You can add the above errata workaround to the components/drivers_nrf/hal/nrf_usbd.h::nrf_usbd_enable()

Could you try this and see if that works?

Best regards,

Håkon