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#![no_std]
extern crate embedded_hal as hal;
pub mod prerendered;
use hal::spi::{FullDuplex, Mode, Phase, Polarity};
use smart_leds_trait::{Color, SmartLedsWrite};
use nb;
use nb::block;
pub const MODE: Mode = Mode {
polarity: Polarity::IdleLow,
phase: Phase::CaptureOnFirstTransition,
};
pub struct Ws2812<SPI> {
spi: SPI,
}
impl<SPI, E> Ws2812<SPI>
where
SPI: FullDuplex<u8, Error = E>,
{
pub fn new(spi: SPI) -> Ws2812<SPI> {
Self { spi }
}
fn write_byte(&mut self, mut data: u8) -> Result<(), E> {
let mut serial_bits: u32 = 0;
for _ in 0..3 {
let bit = data & 0x80;
let pattern = if bit == 0x80 { 0b110 } else { 0b100 };
serial_bits = pattern | (serial_bits << 3);
data <<= 1;
}
block!(self.spi.send((serial_bits >> 1) as u8))?;
for _ in 3..8 {
let bit = data & 0x80;
let pattern = if bit == 0x80 { 0b110 } else { 0b100 };
serial_bits = pattern | (serial_bits << 3);
data <<= 1;
}
self.spi.read().ok();
block!(self.spi.send((serial_bits >> 8) as u8))?;
self.spi.read().ok();
block!(self.spi.send(serial_bits as u8))?;
self.spi.read().ok();
Ok(())
}
fn flush(&mut self) -> Result<(), E> {
for _ in 0..20 {
block!(self.spi.send(0))?;
self.spi.read().ok();
}
Ok(())
}
}
impl<SPI, E> SmartLedsWrite for Ws2812<SPI>
where
SPI: FullDuplex<u8, Error = E>,
{
type Error = E;
fn write<T>(&mut self, iterator: T) -> Result<(), E>
where
T: Iterator<Item = Color>,
{
if cfg!(feature = "mosi_idle_high") {
self.flush()?;
}
for item in iterator {
self.write_byte(item.g)?;
self.write_byte(item.r)?;
self.write_byte(item.b)?;
}
self.flush()?;
Ok(())
}
}