zephyr

History

Anas Nashif c9d6b289c7 samples: pwm: depend on boards supporting PWM Still need a better way to filter and a better way to support multiple platforms with these tests, but for now we remove the build_only tag and make it depend on real HW. Signed-off-by: Anas Nashif <anas.nashif@intel.com>		2017-12-28 20:24:29 -05:00
..
src	sample: blink_led: Add support for stm32f4_disco	2017-11-14 07:04:00 -05:00
CMakeLists.txt	Introduce cmake-based rewrite of KBuild	2017-11-08 20:00:22 -05:00
README.rst	sample: blink_led: Add support for stm32f4_disco	2017-11-14 07:04:00 -05:00
prj.conf	samples: blink_led: Add support for hexiwear_k64	2017-08-09 18:13:29 -04:00
sample.yaml	samples: pwm: depend on boards supporting PWM	2017-12-28 20:24:29 -05:00

README.rst

.. _blink-led-sample:

PWM: Blink LED
##############

Overview
********

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

The LED will start at a blinking frequency of 1 Hz. Every 4 seconds,
the blinking frequency will double. When the blinking frequency
reaches 64 Hz, the blinking frequency will be halved every 4 seconds
until the blinking frequency reaches 1 Hz. This completes a whole
blinking cycle. This faster-then-slower LED blinking cycle repeats forever.

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, Nucleo_L476RG, and STM32F4_DISCOVERY
===================================================
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/blink_led
   :board: arduino_101
   :goals: build flash
   :compact:

After flashing the image to the board, the user LED on the board should start to
blinking as discussed in overview