I use nRF5_SDK_16.0.0_98a08e2\examples\peripheral\usbd_ble_uart_freertos.Error:Unknown USB device (device descriptor request failed).
I use nRF5_SDK_15.2.0_9412b96\examples\peripheral\usbd_ble_uart_freertos.nRF52 USB CDC BLE Demo This is OK.
So I continue to test sdk15.3.The result is also Unknown USB device (device descriptor request failed).
Why is that? It's a strange question.
Use PC windows10.
Maybe I can't use a PC that has registered nRF52 USB CDC BLE again.Because I used it before nRF5_SDK_15.2.0_9412b96\examples\peripheral\usbd_ble_uart_freertos.