.. zephyr:code-sample:: spi-bitbang
:name: SPI bitbang
:relevant-api: spi_interface
Use the bitbang SPI driver for communicating with a slave.
Overview
********
This sample demonstrates using the bitbang SPI driver. The bitbang driver can
be useful for devices which use a non multiple of 8 word size, for example some
LCDs which have an extra cmd/data bit.
This sample loops through some different spi transfer configurations.
Building and Running
********************
The application will build only for a target that has a :ref:`devicetree
<dt-guide>` entry with :dtcompatible:`zephyr,spi-bitbang` as a compatible.
You can connect the MISO and MOSI pins with a wire to provide a basic loopback
test for receive data.
.. zephyr-app-commands::
:zephyr-app: samples/drivers/spi_bitbang
:board: nrf52840dk/nrf52840
:goals: build flash
:compact:
Sample Output
=============
.. code-block:: console
*** Booting Zephyr OS build zephyr-v2.6.0-2939-g1882b95b42e2 ***
basic_write_9bit_words; ret: 0
wrote 0101 00ff 00a5 0000 0102
9bit_loopback_partial; ret: 0
tx (i) : 0101 0102
tx (ii) : 0003 0004 0105
rx (ii) : 0003 0004 0105
basic_write_9bit_words; ret: 0
wrote 0101 00ff 00a5 0000 0102
9bit_loopback_partial; ret: 0
tx (i) : 0101 0102
tx (ii) : 0003 0004 0105
rx (ii) : 0003 0004 0105
basic_write_9bit_words; ret: 0
wrote 0101 00ff 00a5 0000 0102
9bit_loopback_partial; ret: 0
tx (i) : 0101 0102
tx (ii) : 0003 0004 0105
rx (ii) : 0003 0004 0105
8dc3f85622