Trait embedded_hal::digital::blocking::IoPin

source · [−]

pub trait IoPin<TInput, TOutput> where
    TInput: InputPin + IoPin<TInput, TOutput>,
    TOutput: OutputPin + IoPin<TInput, TOutput>, {
    type Error: Debug;

    fn into_input_pin(self) -> Result<TInput, Self::Error>;
    fn into_output_pin(self, state: PinState) -> Result<TOutput, Self::Error>;
}

Expand description

Single pin that can switch from input to output mode, and vice-versa.

Example use (assumes the Error type is the same for the IoPin, InputPin, and OutputPin):

use core::time::Duration;
use embedded_hal::digital::blocking::{IoPin, InputPin, OutputPin};

pub fn ping_and_read<TInputPin, TOutputPin, TError: core::fmt::Debug>(
    mut pin: TOutputPin, delay_fn: &dyn Fn(Duration) -> ()) -> Result<bool, TError>
where
    TInputPin : InputPin<Error = TError> + IoPin<TInputPin, TOutputPin, Error = TError>,
    TOutputPin : OutputPin<Error = TError> + IoPin<TInputPin, TOutputPin, Error = TError>,
{
    // Ping
    pin.set_low()?;
    delay_fn(Duration::from_millis(10));
    pin.set_high()?;

    // Read
    let pin = pin.into_input_pin()?;
    delay_fn(Duration::from_millis(10));
    pin.is_high()
}