zephyr/samples/subsys/console/getchar
Gerard Marull-Paretas 79e6b0e0f6 includes: prefer <zephyr/kernel.h> over <zephyr/zephyr.h>
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>
2022-09-05 16:31:47 +02:00
..
src includes: prefer <zephyr/kernel.h> over <zephyr/zephyr.h> 2022-09-05 16:31:47 +02:00
CMakeLists.txt
README.rst
prj.conf
sample.yaml

README.rst

.. _console_getchar_sample:

console_getchar() Sample Application
####################################

Overview
********

This example shows how to use :c:func:`console_getchar` function.
Similar to the well-known ANSI C getchar() function,
:c:func:`console_getchar` either returns the next available input
character or blocks waiting for one. Using this function, it should be
fairly easy to port existing ANSI C, POSIX, or Linux applications which
process console input character by character. The sample also allows to
see key/character codes as returned by the function.

If you are interested in line by line console input, see
:ref:`console_getline_sample`.


Requirements
************

UART console is required to run this sample.


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

The easiest way to run this sample is using QEMU:

.. zephyr-app-commands::
   :zephyr-app: samples/subsys/console/getchar
   :host-os: unix
   :board: qemu_x86
   :goals: run
   :compact:

Now start pressing keys on a keyboard, and they will be printed both as
hex values and in character form. Be sure to press Enter, Up/Down, etc.
key to check what control characters are produced for them.
Exit QEMU by pressing :kbd:`CTRL+A` :kbd:`x`.