1# nRF5340 (Audio) DK Board as USB HCI Dongle Guide 2 3This will turn the Nordic nRF5340 DK and Audio DK boards into an USB CDC HCI dongle. 4 5If using the NRF Connect SDK ( sdk-nrf ) it is important to follow the order in this document, as 'west flash' 6will also program the NetCore with zephyr-ll which needs to be replaced afterwards with the Packetcraft Link Layer. 7 8## Preconditions 9Copy the included files to '${ZEPHYR_ROOT}/zephyr/examples/bluetooth/hci_uart/' 10 11## Build/Flash HCI Bridge on AppCore 12 13You need to specify the board with the '-b' param in the west call. 14 15For nRF5340 DK: 16 17```sh 18cd ${ZEPHYR_ROOT}/zephyr/samples/bluetooth/hci_uart/ 19west build --pristine -b nrf5340dk_nrf5340_cpuapp -- -DDTC_OVERLAY_FILE=usb.overlay -DOVERLAY_CONFIG=overlay-usb.conf 20west flash 21``` 22 23For nRF5340 Audio DK (ADK) 24 25```sh 26cd ${ZEPHYR_ROOT}/zephyr/samples/bluetooth/hci_uart/ 27west build --pristine -b nrf5340_audio_dk_nrf5340_cpuapp -- -DDTC_OVERLAY_FILE=usb.overlay -DOVERLAY_CONFIG=overlay-usb.conf 28west flash 29``` 30 31## Flash Packetcraft Link Layer on NetCore 32 33```sh 34nrfjprog --program ble5-ctr-rpmsg_3424.hex --chiperase --coprocessor CP_NETWORK -r --verify 35``` 36 37the corresponding hex file is in the [nrfConnectSDK](https://github.com/nrfconnect/sdk-nrf/blob/main/lib/bin/bt_ll_acs_nrf53/bin) 38 39## Usage / Find Serial Port 40 41On macOS, the nRF5340 with the HCI bridge show up as 5 /dev/tty. To find the HCI one, list all /dev/tty.* devices, 42then press and hold the RESET button and list all devices again. The missing one is the one provided by the HCI bridge. 43 44## HCI log 45 46```sh 47btmon -J nrf5340_xxaa_app -w <logfile> 48``` 49