The latest development version of this page may be more current than this released 2.2.1 version.

Bluetooth: HCI SPI


Expose Zephyr Bluetooth Controller support over SPI to another device/CPU using the Zephyr SPI HCI transport protocol (similar to BlueNRG).


  • A board with SPI slave, GPIO and BLE support.

Building and Running

In order to use this application, you need a board with a Bluetooth controller and SPI slave drivers, and a spare GPIO to use as an interrupt line to the SPI master.

You then need to ensure that your Devicetree settings provide a definition for the slave HCI SPI device:

bt-hci@0 {
        compatible = "zephyr,bt-hci-spi-slave";

You can then build this application and flash it onto your board in the usual way; see Supported 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 BT_SPI configuration option for more information.

Refer to Bluetooth samples for general Bluetooth information, and to Providing Bluetooth to 96b_carbon for instructions specific to the 96Boards Carbon board.