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#![no_main]
#![no_std]
use panic_halt as _;
use stm32f0xx_hal as hal;
use crate::hal::{
pac,
prelude::*,
spi::Spi,
spi::{Mode, Phase, Polarity},
};
use cortex_m_rt::entry;
#[entry]
fn main() -> ! {
const MODE: Mode = Mode {
polarity: Polarity::IdleHigh,
phase: Phase::CaptureOnSecondTransition,
};
if let Some(p) = pac::Peripherals::take() {
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, miso, mosi) = cortex_m::interrupt::free(move |cs| {
(
gpioa.pa5.into_alternate_af0(cs),
gpioa.pa6.into_alternate_af0(cs),
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;
}
}