This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down list at the bottom of the left panel and select the desired version.



This sample controls up to 16 LEDs connected to a is31fl3216a driver.

Each LED is gradually pulsed until it reach 100% of luminosity and gradually turned off again.

Once each LED was pulsed, multiple LEDs are pulse simultaneously using the led_write_channels() API.

Test pattern

For each LED:

  • Increase the luminosity until 100% is reached

  • Decrease the luminosity until completely turned off

  • Increase the luminosity of LEDs 2 to 4 until 100% is reached

  • Decrease the luminosity of LEDs 2 to 4 until completely turned off

Building and Running

This sample can be built and executed when the devicetree has an I2C device node with compatible issi,is31fl3216a enabled, along with the relevant bus controller node also being enabled.

As an example this sample provides a DTS overlay for the NXP LPCXpresso55S28 board (boards/lpcxpresso55s28.overlay). It assumes that a I2C _is31fl3216a LED driver (with 16 LEDs wired) is connected to the I2C bus at address 0x74.