34 lines
939 B
ReStructuredText
34 lines
939 B
ReStructuredText
.. _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.
|