app_usbd working on nrf52-dongle, not on nrf52840-dk

[Andrew Kohlsmith]

I have a small app_usbd demo which works fine on the nrf52 dongle, but not on the larger nrf52840-dk.

I am running SDK 15.0 with the errata fix mentioned on several other posts here. The code does not hang or crash, but the USB device does not enumerate. Using the onboard J-Link I can see that the USBD driver gets a couple of startup events but nothing afterward. No enumerations, it just seems to sit idle.

Is there anything special I need to do either with cutting traces or moving my I/O around in order to get this to function on the nRF52840-dk? The only I/O I'm using right now is p0.09 and p0.10, but as mentioned this same firmware works fine on the dongle.

[Sigurd]

Hi,

1) Do you see the same issue with the USB examples in the SDK? e.g. the usbd_hid_generic ?

2) Have you tried a different USB cable? Make sure that you are not using a "charge" only USB cable.

3) Are you using the nRF USB (J3) connector?