zephyr

History

Torsten Rasmussen 407b49b35c cmake: use find_package to locate Zephyr Using find_package to locate Zephyr. Old behavior was to use $ENV{ZEPHYR_BASE} for inclusion of boiler plate code. Whenever an automatic run of CMake happend by the build system / IDE then it was required that ZEPHYR_BASE was defined. Using ZEPHYR_BASE only to locate the Zephyr package allows CMake to cache the base variable and thus allowing subsequent invocation even if ZEPHYR_BASE is not set in the environment. It also removes the risk of strange build results if a user switchs between different Zephyr based project folders and forgetting to reset ZEPHYR_BASE before running ninja / make. Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>		2020-03-27 16:23:46 +01:00
..
src	samples: convert blinky to new DT API	2020-03-24 10:11:20 -05:00
CMakeLists.txt	cmake: use find_package to locate Zephyr	2020-03-27 16:23:46 +01:00
prj.conf	samples: remove CONFIG_SERIAL from blinky	2019-11-18 13:49:42 +01:00
README.rst	samples: convert blinky to new DT API	2020-03-24 10:11:20 -05:00
sample.yaml	tests: fix test identifiers	2019-12-09 15:53:44 -05:00

README.rst

.. _blinky-sample:

Blinky sample
#############

Overview
********

Blinky is a simple application which blinks an LED forever.

The source code shows how to configure GPIO pins as outputs, then turn them on
and off.

.. _blinky-sample-requirements:

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

The board must have an LED connected via a GPIO pin. These are called "User
LEDs" on many of Zephyr's :ref:`boards`. The LED must be configured using the
``led0`` :ref:`dt-guide` alias in the :ref:`BOARD.dts file
<devicetree-in-out-files>`.

You will see this error if you try to build Blinky for an unsupported board:

.. code-block:: none

   Unsupported board: led0 devicetree alias is not defined

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

Build and flash Blinky as follows, changing ``reel_board`` for your board:

.. zephyr-app-commands::
   :zephyr-app: samples/basic/blinky
   :board: reel_board
   :goals: build flash
   :compact:

After flashing, the LED starts to blink. Blinky does not print to the console.