zephyr

History

Kumar Gala b8a36f665b samples: drivers: ht16k33: Move dts overlays under boards Move the dts overlay under a boards/ dir to make it match conf files. Signed-off-by: Kumar Gala <kumar.gala@linaro.org>		2020-04-01 10:44:31 -04:00
..
boards	samples: drivers: ht16k33: Move dts overlays under boards	2020-04-01 10:44:31 -04:00
src	timeout: Fix up API usage	2020-03-31 19:40:47 -04:00
CMakeLists.txt	cmake: use find_package to locate Zephyr	2020-03-27 16:23:46 +01:00
README.rst	boards: nrf52840_pca10056: Rename board to nrf52840dk_nrf52840	2020-03-27 09:14:08 +01:00
prj.conf	…
sample.yaml	boards: nrf52840_pca10056: Rename board to nrf52840dk_nrf52840	2020-03-27 09:14:08 +01:00

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:`nrf52840dk_nrf52840` board, and
connect a HT16K33 LED driver at address 0x70 on the I2C-0 bus.

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/ht16k33
   :board: nrf52840dk_nrf52840
   :goals: build
   :compact:

For flashing the application, refer to the Flashing section of the
:ref:`nrf52840dk_nrf52840` board documentation.

References
**********

.. target-notes::

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