Bluetooth: Direction Finding Peripheral
Overview
A simple application demonstrating the BLE Direction Finding CTE transmission in connected mode by response to a request received from connected peer device.
Requirements
Nordic nRF SoC based board with Direction Finding support (example boards: nRF52833 DK, nRF52820 emulation on nRF52833 DK, nRF5340 DK)
Antenna matrix for AoA (optional)
Check your SoC’s product specification for Direction Finding support if you are unsure.
Building and Running
By default the application supports Angle of Arrival and Angle of Departure mode.
To use Angle of Arrival mode only, build this application as follows,
changing nrf52833dk/nrf52833 as needed for your board:
west build -b nrf52833dk/nrf52833 samples/bluetooth/direction_finding_peripheral -- -DEXTRA_CONF_FILE=overlay-aoa.conf
west flash
To run the application on nRF5340DK, a Bluetooth controller application must also run on the network core. The Bluetooth: HCI IPC sample application may be used. To build this sample with direction finding support enabled:
Copy samples/bluetooth/direction_finding_peripheral/boards/nrf52833dk_nrf52833.overlay to a new file,
samples/bluetooth/hci_ipc/boards/nrf5340dk_nrf5340_cpunet.overlay.Make sure the same GPIO pins are assigned to Direction Finding Extension in file samples/bluetooth/direction_finding_peripheral/boards/nrf5340dk_nrf5340_cpuapp.overlay. as those in the created file
samples/bluetooth/hci_ipc/boards/nrf5340dk_nrf5340_cpunet.overlay.Copy samples/bluetooth/direction_finding_peripheral/boards/nrf52833dk_nrf52833.conf to a new file,
samples/bluetooth/hci_ipc/boards/nrf5340dk_nrf5340_cpunet.conf.
Antenna matrix configuration
To use this sample with Angle of Departure enabled on Nordic SoCs, additional configuration must be provided via devicetree to enable control of the antenna array.
An example devicetree overlay is in
samples/bluetooth/direction_finding_peripheral/boards/nrf52833dk_nrf52833.overlay.
You can customize this overlay when building for the same board, or create your
own board-specific overlay in the same directory for a different board. See
nordic,nrf-radio for documentation on the properties used in
this overlay. See Set devicetree overlays for information on setting up
and using overlays.
Note that antenna matrix configuration for the nRF5340 SoC is part of the
network core application. When Bluetooth: HCI IPC is used as the
network core application, the antenna matrix configuration should be stored in
the file
samples/bluetooth/hci_ipc/boards/nrf5340dk_nrf5340_cpunet.overlay
instead.