LP3943: 16-Channel RGB, White-LED Driver


This sample controls 16 LEDs connected to an LP3943 driver, in a continuous pattern of turning them on one at a time (at a one second interval) until they’re all on, and then turning them off in reverse order.


The 96Boards Neonkey board has an LP3943 driver and 16 LEDs on board, so we’ll use this board for our example.

Building and Running

Build the application for the 96Boards Neonkey board, which has an LP3943 driver included.

# On Linux/macOS
cd $ZEPHYR_BASE/samples/drivers/led_lp3943
mkdir build && cd build
# On Windows
cd %ZEPHYR_BASE%\samples\drivers\led_lp3943
mkdir build & cd build
cmake -GNinja -DBOARD=96b_neonkey ..

For flashing the application, refer to the Flashing section of the 96Boards Neonkey board documentation.

When you connect to the board’s serial console, you should see the following output in addition to the LED pattern:

***** BOOTING ZEPHYR OS v1.11.99 *****
[general] [INF] main: Found LED device LP3943
[general] [INF] main: Displaying the pattern