infrared 0.14.2

Infrared remote control library
Documentation 
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use core::marker::PhantomData;

#[cfg(feature = "embedded")]
use embedded_hal::digital::v2::InputPin;

use crate::{
    receiver::{DecoderFactory, DecodingError, Error, NoPin, ProtocolDecoder},
    Protocol,
};

/// Period poll Receiver
pub struct PeriodicPoll<
    Proto: DecoderFactory<u32>,
    Input = NoPin,
    Cmd: From<<Proto as Protocol>::Cmd> = <Proto as Protocol>::Cmd,
> {
    /// Our internal clock
    clock: u32,
    /// Last seen edge
    edge: bool,
    /// Seen at
    last_edge: u32,
    /// The decoder
    decoder: Proto::Decoder,
    /// Input pin or NoPinInput
    input: Input,
    /// Command
    cmd: PhantomData<Cmd>,
}

impl<Proto, Input, Cmd> PeriodicPoll<Proto, Input, Cmd>
where
    Proto: DecoderFactory<u32>,
    Cmd: From<<Proto as Protocol>::Cmd>,
{
    pub fn with_input(freq: u32, input: Input) -> Self {
        Self {
            decoder: Proto::decoder(freq),
            input,
            clock: 0,
            edge: false,
            last_edge: 0,
            cmd: PhantomData,
        }
    }

    pub fn poll_base(&mut self, edge: bool) -> Result<Option<Cmd>, DecodingError> {
        self.clock = self.clock.wrapping_add(1);

        if edge == self.edge {
            return Ok(None);
        }

        let ds = self.clock.wrapping_sub(self.last_edge);
        self.edge = edge;
        self.last_edge = self.clock;

        self.decoder
            .event_total(edge, ds)
            .map(|cmd| cmd.map(Into::into))
    }
}

impl<Proto, Cmd> PeriodicPoll<Proto, NoPin, Cmd>
where
    Proto: DecoderFactory<u32>,
    Cmd: From<<Proto as Protocol>::Cmd>,
{
    pub fn new(freq: u32) -> Self {
        Self::with_input(freq, NoPin)
    }

    pub fn poll(&mut self, edge: bool) -> Result<Option<Cmd>, DecodingError> {
        self.poll_base(edge)
    }
}

#[cfg(feature = "embedded-hal")]
impl<Proto, Pin, Cmd> PeriodicPoll<Proto, Pin, Cmd>
where
    Proto: DecoderFactory<u32>,
    Pin: InputPin,
    Cmd: From<<Proto as Protocol>::Cmd>,
{
    pub fn with_pin(freq: u32, pin: Pin) -> PeriodicPoll<Proto, Pin, Cmd> {
        Self::with_input(freq, pin)
    }

    pub fn poll(&mut self) -> Result<Option<Cmd>, Error<Pin::Error>> {
        let edge = self.input.is_low().map_err(Error::Hal)?;

        self.poll_base(edge).map_err(Into::into)
    }
}