0d1d441aec
This doesn't sacrifice any readability when compiled for boards that don't support this alias. Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
42 lines
999 B
ReStructuredText
42 lines
999 B
ReStructuredText
.. _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.
|