zephyr

History

Benjamin Cabé 776c0cab9a doc: boards: nordic: Adopt zephyr:board directives Migrate all Nordic boards to leverage the full extent of zephyr:board directives. Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>		2025-03-31 22:00:02 +02:00
..
boards	boards: arduino: uno_r4: Add ADC, PWM, I2C, SPI, and TRNG	2025-03-21 09:51:47 +01:00
src	samples: fade_led: fix build error when PWM is not enabled	2025-02-06 14:47:15 +01:00
sysbuild/vpr_launcher	samples: basic: add support for nRF54H20 cpuppr PWM	2025-01-31 09:38:25 +01:00
CMakeLists.txt
prj.conf
README.rst	doc: boards: nordic: Adopt zephyr:board directives	2025-03-31 22:00:02 +02:00
sample.yaml

README.rst

.. zephyr:code-sample:: fade-led
   :name: Fade LED
   :relevant-api: pwm_interface

   Fade an LED using the PWM API.

Overview
********

This application "fades" a LED using the :ref:`PWM API <pwm_api>`.

The LED starts off increases its brightness until it is fully or nearly fully
on. The brightness then decreases until the LED is off, completing on fade
cycle. Each cycle takes 2.5 seconds, and the cycles repeat forever. The PWM
period is taken from Devicetree. It should be fast enough to be above the
flicker fusion threshold.

Requirements and Wiring
***********************

This sample has the same requirements and wiring considerations as the
:zephyr:code-sample:`pwm-blinky` sample.

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

To build and flash this sample for the :zephyr:board:`nrf52840dk`:

.. zephyr-app-commands::
   :zephyr-app: samples/basic/fade_led
   :board: nrf52840dk/nrf52840
   :goals: build flash
   :compact:

Change ``nrf52840dk/nrf52840`` appropriately for other supported boards.

After flashing, the sample starts fading the LED as described above. It also
prints information to the board's console.