This crate is a driver for WS28XX (WS2811, WS2812, WS2812B, WS2818) RGB LED chains/strips. They are also known as "NeoPixel" devices or "Smard LEDs".

At the beginning I was not aware of that WS2811, WS2812, WS2812B, ..., WS2818 are basically the same. I just did not notice it. I though I'm having WS2818 LEDs and there wasn't a driver for that specific product with WS2818 in its name. See this links to learn about the differences:

• https://www.alldatasheet.com/view.jsp?Searchword=WS2818
• https://www.witop-tech.com/what-is-the-difference-ws2818-vs-ws2811-usc1903-magic-color-digital-led-strip/

It seems like all of them work use the same protocol, tho. That means this driver probably works for all of them.

It's a simple, stripped down, educational example how to bring your LEDs to life. This [0] is an example device with chained WS2818 RGB LEDs that can be used with this driver. This driver only works on Linux systems with a SPI device, like Raspberry Pi [1]. This is needed because my driver operates at 15.6MHz. This is required because I need to reach specific timings in nanoseconds according to the specification while sending data [2]. It uses a one wire protocol.

The SPI device in your Raspberry Pi has a reliable clock with high frequencies available. Regular GPIO pins won't work! Toggling GPIO pins takes 1µs (in my testing) which is WAY TOO SLOW! Therefore I use SPI. There is a clock device in hardware - much more reliable!

Find the MOSI-Pin on your device (e.g. Raspberry Pi) and connect it with DIN-Port of the LED. That's all what's needed.

Have a look into the examples/code for further explications. :)

There is no warranty that this will work on your setup! High frequency stuff is complicated!

Demo using a 8x8 RGB LED matrix. DIN is connected with MOSI (SPI Out Port).

See https://github.com/phip1611/ws2818-rgb-led-spi-driver/tree/master/examples.

use ws2818_rgb_led_spi_driver::encoding::{encode_rgb};
use ws2818_rgb_led_spi_driver::adapter::WS28xxAdapter;

fn main() {
    println!("make sure you have \"SPI\" on your Pi enabled and that MOSI-Pin is connected with DIN-Pin!");
    let mut adapter = WS28xxAdapter::new("/dev/spidev0.0").unwrap();

    // Method 1: encode first and write in two step (prefered way; better performance)
    {
        let mut spi_encoded_rgb_bits = vec![];
        // set first three pixels to bright red, bright green and bright blue
        spi_encoded_rgb_bits.extend_from_slice(&encode_rgb(255, 0, 0));
        spi_encoded_rgb_bits.extend_from_slice(&encode_rgb(0, 255, 0));
        spi_encoded_rgb_bits.extend_from_slice(&encode_rgb(0, 0, 255));
        adapter.write_encoded_rgb(&spi_encoded_rgb_bits).unwrap();
    }

    // Method 2: encode and write in one step
    {
        let mut rgb_values = vec![];
        // set first three pixels to bright red, bright green and bright blue
        rgb_values.push((255, 0, 0));
        rgb_values.push((0, 255, 0));
        rgb_values.push((0, 0, 255));
        adapter.write_rgb(&rgb_values).unwrap();
    }
}

[0] https://www.az-delivery.de/products/u-64-led-panel?variant=6127700738075
[1] https://www.raspberrypi.org/documentation/hardware/raspberrypi/spi/README.md
[2] https://cdn-shop.adafruit.com/datasheets/WS2812.pdf