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#![no_std]
use embedded_hal as hal;
use crate::hal::digital::v2::OutputPin;
use crate::hal::timer::{CountDown, Periodic};
use smart_leds_trait::{SmartLedsWrite, RGB8};
use nb;
use nb::block;
pub struct Ws2812<TIMER, PIN> {
timer: TIMER,
pin: PIN,
}
impl<TIMER, PIN> Ws2812<TIMER, PIN>
where
TIMER: CountDown + Periodic,
PIN: OutputPin,
{
pub fn new(timer: TIMER, mut pin: PIN) -> Ws2812<TIMER, PIN> {
pin.set_low().ok();
Self { timer, pin }
}
#[cfg(feature = "slow")]
fn write_byte(&mut self, mut data: u8) {
for _ in 0..8 {
if (data & 0x80) != 0 {
block!(self.timer.wait()).ok();
self.pin.set_high().ok();
block!(self.timer.wait()).ok();
block!(self.timer.wait()).ok();
self.pin.set_low().ok();
} else {
block!(self.timer.wait()).ok();
self.pin.set_high().ok();
self.pin.set_low().ok();
block!(self.timer.wait()).ok();
block!(self.timer.wait()).ok();
}
data <<= 1;
}
}
#[cfg(not(feature = "slow"))]
fn write_byte(&mut self, mut data: u8) {
for _ in 0..8 {
if (data & 0x80) != 0 {
block!(self.timer.wait()).ok();
self.pin.set_high().ok();
block!(self.timer.wait()).ok();
block!(self.timer.wait()).ok();
self.pin.set_low().ok();
} else {
block!(self.timer.wait()).ok();
self.pin.set_high().ok();
block!(self.timer.wait()).ok();
self.pin.set_low().ok();
block!(self.timer.wait()).ok();
}
data <<= 1;
}
}
}
impl<TIMER, PIN> SmartLedsWrite for Ws2812<TIMER, PIN>
where
TIMER: CountDown + Periodic,
PIN: OutputPin,
{
type Error = ();
type Color = RGB8;
fn write<T, I>(&mut self, iterator: T) -> Result<(), Self::Error>
where
T: Iterator<Item = I>,
I: Into<Self::Color>,
{
for item in iterator {
let item = item.into();
self.write_byte(item.g);
self.write_byte(item.r);
self.write_byte(item.b);
}
for _ in 0..900 {
block!(self.timer.wait()).ok();
}
Ok(())
}
}