zephyr

History

Kuo-Lang Tseng e7f261b748 samples: blink_led: change hard-coded device name Use the config name defined by the driver Kconfig in device binding calls as that is more portable and safer because device name can change and the app does not need to change. Jira: ZEP-1764 Change-Id: If8c14dd4eb186bace863432d454c9122461f2f9c Signed-off-by: Kuo-Lang Tseng <kuo-lang.tseng@intel.com>		2017-02-23 13:25:20 +00:00
..
src	samples: blink_led: change hard-coded device name	2017-02-23 13:25:20 +00:00
Makefile	…
README.rst	doc: fix .rst files canonical heading order	2017-01-20 16:06:36 -08:00
prj.conf	…
testcase.ini	…

README.rst

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

Overview
********

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

The LED will start at a blinking frequency of 0.5Hz. Every 4 seconds,
the blinking frequency will double. When the blinking frequency
reaches 500Hz, the blinking frequency will be halved every 4 seconds
until the blinking frequency reaches 0.5Hz. This completes a whole
blinking cycle. From now on, the LED will repeat the blinking 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

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

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

.. code-block:: console

   $ cd samples/basic/blink_led
   $ make BOARD=arduino_101
   $ make BOARD=arduino_101 flash

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