zephyr

History

Maureen Helm 28bf1a554a samples: blink_led: Add support for hexiwear_k64 The hexiwear_k64 board can drive the leds with a pwm, so update the blink_led sample to work with this board. Reduces the maximum blinking frequency from 500 Hz to 64 Hz because your eye can't distinguish these higher frequencies (the led appears solidly on). Increases the minimum blinking frequency from 0.5 Hz to 1 Hz because the mcux pwm driver can't handle frequencies less than 1 Hz. Jira: ZEP-2025 Signed-off-by: Maureen Helm <maureen.helm@nxp.com>		2017-08-09 18:13:29 -04:00
..
src	samples: blink_led: Add support for hexiwear_k64	2017-08-09 18:13:29 -04:00
Makefile	…
README.rst	samples: blink_led: Add support for hexiwear_k64	2017-08-09 18:13:29 -04:00
prj.conf	samples: blink_led: Add support for hexiwear_k64	2017-08-09 18:13:29 -04:00
sample.yaml	samples: blink_led: Add support for hexiwear_k64	2017-08-09 18:13:29 -04:00

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 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:

.. 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