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zephyr/samples/basic/fade_led
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Kumar Gala 937f45dc86 samples: baisc: Update to use DT generated pwm defines 
We update 'blink_led', 'fade_led' and 'rgb_led' to support dt generated
defines for the PWM info needed for each.  Since hexiwear_k64 supports
generating the info, moved the support for hexiwear_k64 to just use the
dt generated defines.

For 'blink_led' and 'fade_led' we use an alias in dt called 'pwm-led0'.
For 'rgb_led' we use aliases 'red-pwm-led', 'green-pwm-led' and
'blue-pwm-led'

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
 		2018-11-05 14:01:21 -06:00
..
src samples: baisc: Update to use DT generated pwm defines 2018-11-05 14:01:21 -06:00
CMakeLists.txt samples, tests: Use semi-accurate project names 2018-10-27 21:31:25 -04:00
README.rst samples: basic: Convert doc to CMake 2017-11-12 21:13:23 -05:00
prj.conf driver: pwm: use new logger 2018-10-08 17:49:12 -04:00
sample.yaml samples: pwm: depend on boards supporting PWM 2017-12-28 20:24:29 -05:00

README.rst 

.. _fade-led-sample:

PWM: Fade LED
#############

Overview
********

This is a sample app which fades a LED using PWM.

The LED will start from dark and increases its
brightness gradually for 10 seconds. Then, the
brightness reduces gradually for 10 seconds and
finally the LED becomes dark again. The LED will
repeat this cycle for ever.

Wiring
******

Arduino 101 and Quark D2000 CRB
===============================
You will need to connect the LED to ground and PWM0 via
the shield. You may need a current limiting resistor. See
your LED datasheet.

Nucleo_F401RE and Nucleo_L476RG
===============================
Connect PWM2(PA0) to LED

Nucleo_F103RB
=============
Connect PWM1(PA8) to LED

Hexiwear K64
============
No special board setup is necessary because there is an on-board RGB LED
connected to the K64 PWM.

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

This sample can be built for multiple boards, in this example we will build it
for the arduino_101 board:

.. zephyr-app-commands::
   :zephyr-app: samples/basic/fade_led
   :board: arduino_101
   :goals: build flash
   :compact: