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zephyr/samples/basic/fade_led
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Manuel Argüelles 5d2670ac1f drivers: pwm: mcux_ftm: allow to select clock source 
FTM internal counter can be clocked by one of three clock sources
independent of the module bus clock. This patch introduces a DT property
to perform the clock selection from DT.

DT sources are updated to keep the current clock selection for all boards,
with exception of ucans32k1sic board which is migrated to use system
clock by default, as this seems to be a better choice for most cases.
Some PWM LED samples require slower clock so overlays are added for
those cases.

Signed-off-by: Manuel Argüelles <manuel.arguelles@nxp.com>
2024-04-19 10:08:53 +02:00
..
boards drivers: pwm: mcux_ftm: allow to select clock source 2024-04-19 10:08:53 +02:00
src drivers: pwm: use pwm_is_ready_dt helper function 2023-08-30 10:19:47 +02:00
CMakeLists.txt cmake: increase minimal required version to 3.20.0 2021-08-20 09:47:34 +02:00
prj.conf driver: pwm: use new logger 2018-10-08 17:49:12 -04:00
README.rst hwmv2: Introduce Hardware model version 2 and convert devices 2024-03-02 16:56:33 -05:00
sample.yaml hwmv2: Introduce Hardware model version 2 and convert devices 2024-03-02 16:56:33 -05:00

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 :ref:`nrf52840dk_nrf52840`:

.. 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.