.. _bluetooth_direction_finding_connectionless_tx:
Bluetooth: Direction Finding Periodic Advertising Beacon
########################################################
Overview
********
A simple application demonstrating the BLE Direction Finding CTE Broadcaster
functionality by sending Constant Tone Extension with periodic advertising PDUs.
Requirements
************
* Nordic nRF SoC based board with Direction Finding support (example boards:
:ref:`nrf52833dk_nrf52833`, :ref:`nrf5340dk_nrf5340`)
* Antenna matrix for AoD (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 (AoA) and Angle of
Departure (AoD) mode.
To use Angle of Arrival mode only, build this application as follows, changing
``nrf52833dk_nrf52833`` as needed for your board:
.. zephyr-app-commands::
:zephyr-app: samples/bluetooth/direction_finding_connectionless_tx
:host-os: unix
:board: nrf52833dk_nrf52833
:gen-args: -DOVERLAY_CONFIG=overlay-aoa.conf
:goals: build flash
:compact:
To run the application on nRF5340DK, a Bluetooth controller application must
also run on the network core. The :zephyr_file:`samples/bluetooth/hci_rpmsg`
sample application may be used. To build this sample with direction finding
support enabled:
* Copy
:zephyr_file:`samples/bluetooth/direction_finding_connectionless_tx/boards/nrf52833dk_nrf52833.overlay`
to a new file,
:file:`samples/bluetooth/hci_rpmsg/boards/nrf5340dk_nrf5340_cpunet.overlay`.
* Make sure the same GPIO pins are assigned to Direction Finding Extension in file
:zephyr_file:`samples/bluetooth/direction_finding_connectionless_tx/boards/nrf5340dk_nrf5340_cpuapp.overlay`.
as those in the created file :file:`samples/bluetooth/hci_rpmsg/boards/nrf5340dk_nrf5340_cpunet.overlay`.
* Copy
:zephyr_file:`samples/bluetooth/direction_finding_connectionless_tx/boards/nrf52833dk_nrf52833.conf`
to a new file,
:file:`samples/bluetooth/hci_rpmsg/boards/nrf5340dk_nrf5340_cpunet.conf`. Add
the line ``CONFIG_BT_EXT_ADV=y`` to enable extended size of
:kconfig:option:`CONFIG_BT_BUF_CMD_TX_SIZE` to support the LE Set Extended
Advertising Data command.
Antenna matrix configuration
****************************
To use this sample with Angle of Departure enabled on Nordic SoCs, additional
configuration must be provided via :ref:`devicetree <dt-guide>` to enable
control of the antenna array, as well as via the ``ant_patterns`` array in the
source code.
An example devicetree overlay is in
:zephyr_file:`samples/bluetooth/direction_finding_connectionless_tx/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
:dtcompatible:`nordic,nrf-radio` for documentation on the properties used in
this overlay. See :ref:`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 :ref:`bluetooth-hci-rpmsg-sample` is used as
network core application, the antenna matrix configuration should be stored in
the file
:file:`samples/bluetooth/hci_rpmsg/boards/nrf5340dk_nrf5340_cpunet.overlay`
instead.
In addition to the devicetree configuration, to successfully use the Direction
Finding locator when the AoA mode is enabled, also update the antenna patterns
in the :cpp:var:`ant_patterns` array in
:zephyr_file:`samples/bluetooth/direction_finding_connectionless_tx/src/main.c`.
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