Ok, last existential newbie question for today
```
let spi = Spi::new(
        peripherals.SPI2,
        sclk,
        mosi,
        miso,
        cs,
        3_000_000u32.Hz(),
        SpiMode::Mode0,
        &clocks,
    );

    let mut ws = Ws2812::new(spi);
```

and in general it works, but I want to put this `ws` to function - how to figure out its **signature**? I just cant find anything that works