stm32f0xx-hal/examples/spi_hal_apa102c.rs

#![no_main]
#![no_std]

#[allow(unused)]
use panic_halt;

use stm32f0xx_hal as hal;

use crate::hal::{
    prelude::*,
    spi::Spi,
    spi::{Mode, Phase, Polarity},
    stm32,
};

use cortex_m_rt::entry;

#[entry]
fn main() -> ! {
    const MODE: Mode = Mode {
        polarity: Polarity::IdleHigh,
        phase: Phase::CaptureOnSecondTransition,
    };

    if let Some(p) = stm32::Peripherals::take() {
        cortex_m::interrupt::free(move |cs| {
            let mut flash = p.FLASH;
            let mut rcc = p.RCC.configure().freeze(&mut flash);

            let gpioa = p.GPIOA.split(&mut rcc);

            // Configure pins for SPI
            let sck = gpioa.pa5.into_alternate_af0(cs);
            let miso = gpioa.pa6.into_alternate_af0(cs);
            let mosi = gpioa.pa7.into_alternate_af0(cs);

            // Configure SPI with 100kHz rate
            let mut spi = Spi::spi1(p.SPI1, (sck, miso, mosi), MODE, 100_000.hz(), &mut rcc);

            // Cycle through colors on 16 chained APA102C LEDs
            loop {
                for r in 0..255 {
                    let _ = spi.write(&[0, 0, 0, 0]);
                    for _i in 0..16 {
                        let _ = spi.write(&[0b1110_0001, 0, 0, r]);
                    }
                    let _ = spi.write(&[0xFF, 0xFF, 0xFF, 0xFF]);
                }
                for b in 0..255 {
                    let _ = spi.write(&[0, 0, 0, 0]);
                    for _i in 0..16 {
                        let _ = spi.write(&[0b1110_0001, b, 0, 0]);
                    }
                    let _ = spi.write(&[0xFF, 0xFF, 0xFF, 0xFF]);
                }
                for g in 0..255 {
                    let _ = spi.write(&[0, 0, 0, 0]);
                    for _i in 0..16 {
                        let _ = spi.write(&[0b1110_0001, 0, g, 0]);
                    }
                    let _ = spi.write(&[0xFF, 0xFF, 0xFF, 0xFF]);
                }
            }
        });
    }

    loop {
        continue;
    }
}