| .. zephyr:code-sample:: bluetooth_hci_spi |
| :name: HCI SPI |
| :relevant-api: hci_raw bluetooth spi_interface |
| |
| Expose a Bluetooth controller to another device or CPU over SPI. |
| |
| Overview |
| ******** |
| |
| Expose Bluetooth Controller support over SPI to another device/CPU using |
| the Zephyr SPI HCI transport protocol (similar to BlueNRG). |
| |
| Requirements |
| ************ |
| |
| A board with SPI slave, GPIO and Bluetooth Low Energy support. |
| |
| Building and Running |
| ******************** |
| |
| You then need to ensure that your :ref:`devicetree <dt-guide>` defines a node |
| for the HCI SPI slave device with compatible |
| :dtcompatible:`zephyr,bt-hci-spi-slave`. This node sets an interrupt line to |
| the host and associates the application with a SPI bus to use. |
| |
| See :zephyr_file:`boards/nrf51dk_nrf51822.overlay |
| <samples/bluetooth/hci_spi/boards/nrf51dk_nrf51822.overlay>` in this sample |
| directory for an example overlay for the :zephyr:board:`nrf51dk` board. |
| |
| You can then build this application and flash it onto your board in |
| the usual way; see :ref:`boards` for board-specific building and |
| flashing information. |
| |
| You will also need a separate chip acting as BT HCI SPI master. This |
| application is compatible with the HCI SPI master driver provided by |
| Zephyr's Bluetooth HCI driver core; see the help associated with the |
| :kconfig:option:`CONFIG_BT_SPI` configuration option for more information. |
| |
| Refer to :zephyr:code-sample-category:`bluetooth` for general Bluetooth information, and |
| to :ref:`96b_carbon_nrf51_bluetooth` for instructions specific to the |
| 96Boards Carbon board. |
