zephyr

History

Simon Guinot df01148aeb drivers: led_pwm: fix device name fallback If the label property is missing in a "pwm-leds" compatible DT node (which is almost always the case), then the device name is now set to DT_NODE_FULL_NAME instead of "LED_PWM_$inst" previously. This allows applications to use the DEVICE_DT_NAME macro to retrieve the device name instead of gessing an arbitrary string. Signed-off-by: Simon Guinot <simon.guinot@seagate.com>		2021-05-19 11:56:01 +02:00
..
src	…
CMakeLists.txt	…
README.rst	…
prj.conf	…
sample.yaml	samples/drivers: led_pwm: Fixes for device testing	2021-01-18 19:11:43 +01:00

README.rst

.. _led_pwm:

LED PWM sample application
##########################

Overview
********

This sample allows to test the led-pwm driver. The first "pwm-leds" compatible
device instance found in DT is used. For each LEDs attached to this device
(child nodes) the same test pattern (described below) is executed. The LED API
functions are used to control the LEDs.

Test pattern
============

For each PWM LEDs (one after the other):

- Turning on
- Turning off
- Increasing brightness gradually
- Blinking on: 0.1 sec, off: 0.1 sec
- Blinking on: 1 sec, off: 1 sec
- Turning off

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

This sample can be built and executed on all the boards with PWM LEDs connected.
The LEDs must be correctly described in the DTS: the compatible property of the
device node must match "pwm-leds". And for each LED, a child node must be
defined and the PWM configuration must be provided through a "pwms" phandle's
node.