zephyr

History

Gerard Marull-Paretas 93b63df762 samples, tests: convert string-based twister lists to YAML lists Twister now supports using YAML lists for all fields that were written as space-separated lists. Used twister_to_list.py script. Some artifacts on string length are due to how ruamel dumps content. Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>		2023-05-10 09:52:37 +02:00
..
boards	…
src	…
CMakeLists.txt	…
README.rst	…
prj.conf	…
sample.yaml	samples, tests: convert string-based twister lists to YAML lists	2023-05-10 09:52:37 +02:00

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