79e6b0e0f6
As of today <zephyr/zephyr.h> is 100% equivalent to <zephyr/kernel.h>. This patch proposes to then include <zephyr/kernel.h> instead of <zephyr/zephyr.h> since it is more clear that you are including the Kernel APIs and (probably) nothing else. <zephyr/zephyr.h> sounds like a catch-all header that may be confusing. Most applications need to include a bunch of other things to compile, e.g. driver headers or subsystem headers like BT, logging, etc. The idea of a catch-all header in Zephyr is probably not feasible anyway. Reason is that Zephyr is not a library, like it could be for example `libpython`. Zephyr provides many utilities nowadays: a kernel, drivers, subsystems, etc and things will likely grow. A catch-all header would be massive, difficult to keep up-to-date. It is also likely that an application will only build a small subset. Note that subsystem-level headers may use a catch-all approach to make things easier, though. NOTE: This patch is **NOT** removing the header, just removing its usage in-tree. I'd advocate for its deprecation (add a #warning on it), but I understand many people will have concerns. Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no> |
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| boards | ||
| src | ||
| CMakeLists.txt | ||
| README.rst | ||
| prj.conf | ||
| sample.yaml | ||
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