zephyr

History

Kumar Gala 8abcaf5365 samples: spi_bitbang: Fix use of deprecated spi_cs_control fields The gpio_dev, gpio_pin, etc fields of struct spi_cs_control are deprecated. Move to using the gpio field. Signed-off-by: Kumar Gala <galak@kernel.org>		2022-06-30 07:14:56 -05:00
..
boards
src	samples: spi_bitbang: Fix use of deprecated spi_cs_control fields	2022-06-30 07:14:56 -05:00
CMakeLists.txt
prj.conf
README.rst
sample.yaml	samples: spi: bitbang: Fix missing pass conditions	2022-05-24 08:57:12 -07:00

README.rst

.. _spi-bitbang-sample:

SPI-Bitbang Sample
####################

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