44 lines
1.2 KiB
ReStructuredText
44 lines
1.2 KiB
ReStructuredText
.. zephyr:code-sample:: ht16k33
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:name: HT16K33 LED driver with keyscan
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:relevant-api: led_interface kscan_interface
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Control up to 128 LEDs connected to an HT16K33 LED driver and log keyscan events.
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Overview
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********
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This sample controls the LEDs connected to a `Holtek HT16K33`_
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driver. The sample supports up to 128 LEDs connected to the
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rows/columns of the HT16K33.
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The LEDs are controlled using the following pattern:
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1. turn on all connected (up to 128) LEDs one-by-one
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2. blink the LEDs at 2 Hz, 1 Hz, and 0.5 Hz
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3. reduce the brightness gradually from 100% to 0%
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4. turn off all LEDs, restore 100% brightness, and start over
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The sample logs keyscan events on the console.
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Building and Running
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********************
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Build the application for the :ref:`nrf52840dk_nrf52840` board, and
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connect an HT16K33 LED driver at address 0x70 on the I2C-0 bus.
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.. zephyr-app-commands::
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:zephyr-app: samples/drivers/ht16k33
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:board: nrf52840dk/nrf52840
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:goals: build
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:compact:
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For flashing the application, refer to the Flashing section of the
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:ref:`nrf52840dk_nrf52840` board documentation.
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References
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**********
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.. target-notes::
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.. _Holtek HT16K33: https://www.holtek.com/page/vg/HT16K33A
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