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63b74f0ec7
The led0 alias doesn't have to be in BOARD.dts, though that is customary. Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no> |
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.. _blinky-sample: Blinky ###### Overview ******** Blinky is a simple application which blinks an LED forever using the :ref:`GPIO API <gpio_api>`. The source code shows how to configure GPIO pins as outputs, then turn them on and off. See :ref:`pwm-blinky-sample` for a sample which uses the PWM API to blink an LED. .. _blinky-sample-requirements: Requirements ************ 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 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:`devicetree <dt-guide>` alias. This is usually done in the :ref:`BOARD.dts file <devicetree-in-out-files>` or a :ref:`devicetree overlay <set-devicetree-overlays>`. 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.