zephyr

History

Paul Sokolovsky f6d8ab8289 subsys: console: Factor out fifo-based console input abstraction Console subsystem is intended to be a layer between console drivers and console clients, like e.g. shell. This change factors out code from shell which dealed with individial console drivers and moves it to console subsystem, under the name console_register_line_input(). To accommodate for this change, older console subsys Kconfig symbol is changed from CONFIG_CONSOLE_PULL to CONFIG_CONSOLE_SUBSYS (CONFIG_CONSOLE is already used by console drivers). This signifies that console subsystem is intended to deal with all of console aspects in Zephyr (existing and new), not just provide some "new" functionality on top of raw console drivers, like it initially started. Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>		2018-06-20 15:59:12 -04:00
..
src	kbuild: Removed KBuild	2017-11-08 20:00:22 -05:00
CMakeLists.txt	Introduce cmake-based rewrite of KBuild	2017-11-08 20:00:22 -05:00
prj.conf	subsys: console: Factor out fifo-based console input abstraction	2018-06-20 15:59:12 -04:00
README.rst	doc: getting_started: Support multi-OS instructions	2018-01-18 16:53:31 -05:00
sample.yaml	samples: remove build_only from various samples	2017-12-28 20:24:29 -05:00

README.rst

.. _console_getchar_sample:

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

Overview
********

This example shows how to use :cpp:func:`console_getchar()` function.
Similar to the well-known ANSI C getchar() function,
:cpp: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 simple.


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.