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Anas Nashif e844b9c844 samples: add harness to exclude from device testing Set harness to led as a placeholder to avoid running samples on platforms that do not have the needed hardware. Fixes #17439 Signed-off-by: Anas Nashif <anas.nashif@intel.com>		2019-08-27 10:29:17 -04:00
..
src	cleanup: include/: move led.h to drivers/led.h	2019-06-27 22:55:49 -04:00
CMakeLists.txt	…
README.rst	…
nrf52840_pca10056.overlay	…
prj.conf	…
sample.yaml	samples: add harness to exclude from device testing	2019-08-27 10:29:17 -04:00

README.rst

.. _ht16k33:

HT16K33 LED driver with keyscan
###############################

Overview
********

This sample controls the LEDs connected to a `Holtek HT16K33`_
driver. The sample supports up to 128 LEDs connected to the
rows/columns of the HT16K33.

The LEDs are controlled using the following pattern:

 1. turn on all connected (up to 128) LEDs one-by-one
 2. blink the LEDs at 2 Hz, 1 Hz, and 0.5 Hz
 3. reduce the brightness gradually from 100% to 0%
 4. turn off all LEDs, restore 100% brightness, and start over

The sample logs keyscan events on the console.

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

Build the application for the :ref:`nrf52840_pca10056` board, and
connect a HT16K33 LED driver at address 0x70 on the I2C-0 bus.

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/ht16k33
   :board: nrf52840_pca10056
   :goals: build
   :compact:

For flashing the application, refer to the Flashing section of the
:ref:`nrf52840_pca10056` board documentation.

References
**********

.. target-notes::

.. _Holtek HT16K33: http://www.holtek.com/productdetail/-/vg/HT16K33