zephyr/samples/drivers/kscan_touch
Tomasz Bursztyka e18fcbba5a device: Const-ify all device driver instance pointers
Now that device_api attribute is unmodified at runtime, as well as all
the other attributes, it is possible to switch all device driver
instance to be constant.

A coccinelle rule is used for this:

@r_const_dev_1
  disable optional_qualifier
@
@@
-struct device *
+const struct device *

@r_const_dev_2
 disable optional_qualifier
@
@@
-struct device * const
+const struct device *

Fixes #27399

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
2020-09-02 13:48:13 +02:00
..
src device: Const-ify all device driver instance pointers 2020-09-02 13:48:13 +02:00
CMakeLists.txt
README.rst samples: fix reStructuredText target directives 2020-08-28 12:54:40 +02:00
prj.conf
sample.yaml

README.rst

.. _kscan-touch-sample:

KSCAN touch panel example
####################################

Overview
********

This sample demonstrates how to interface with a touch panel. When touches are
detected a log message is output on the console.

Building and Running
********************

The sample can be built and executed on boards with a touch panel for example
stm32f746g_disco or mimxrt1060_evk. The boards dts file should contain an alias
to kscan0

Sample output
=============

.. code-block:: console

   KSCAN test for touch panels.
   Note: You are expected to see several callbacks
   as you touch the screen.