rppal 0.22.1

Interface for the Raspberry Pi's GPIO, I2C, PWM, SPI and UART peripherals.
Documentation 
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use core::convert::Infallible;

use super::{InputPin, IoPin, Level, OutputPin, Pin};

#[cfg(feature = "embedded-hal")]
impl embedded_hal::digital::ErrorType for Pin {
    type Error = Infallible;
}

#[cfg(feature = "embedded-hal")]
impl embedded_hal::digital::InputPin for Pin {
    fn is_high(&mut self) -> Result<bool, Self::Error> {
        Ok(Self::read(self) == Level::High)
    }

    fn is_low(&mut self) -> Result<bool, Self::Error> {
        Ok(Self::read(self) == Level::Low)
    }
}

#[cfg(feature = "embedded-hal")]
impl embedded_hal::digital::ErrorType for InputPin {
    type Error = Infallible;
}

#[cfg(feature = "embedded-hal")]
impl embedded_hal::digital::InputPin for InputPin {
    fn is_high(&mut self) -> Result<bool, Self::Error> {
        Ok((*self).is_high())
    }

    fn is_low(&mut self) -> Result<bool, Self::Error> {
        Ok((*self).is_low())
    }
}

#[cfg(feature = "embedded-hal")]
impl embedded_hal::digital::ErrorType for IoPin {
    type Error = Infallible;
}

#[cfg(feature = "embedded-hal")]
impl embedded_hal::digital::InputPin for IoPin {
    fn is_high(&mut self) -> Result<bool, Self::Error> {
        Ok((*self).is_high())
    }

    fn is_low(&mut self) -> Result<bool, Self::Error> {
        Ok((*self).is_low())
    }
}

#[cfg(feature = "embedded-hal")]
impl embedded_hal::digital::ErrorType for OutputPin {
    type Error = Infallible;
}

#[cfg(feature = "embedded-hal")]
impl embedded_hal::digital::InputPin for OutputPin {
    fn is_high(&mut self) -> Result<bool, Self::Error> {
        Ok(Self::is_set_high(self))
    }

    fn is_low(&mut self) -> Result<bool, Self::Error> {
        Ok(Self::is_set_low(self))
    }
}

#[cfg(feature = "embedded-hal")]
impl embedded_hal::digital::OutputPin for OutputPin {
    fn set_low(&mut self) -> Result<(), Self::Error> {
        OutputPin::set_low(self);

        Ok(())
    }

    fn set_high(&mut self) -> Result<(), Self::Error> {
        OutputPin::set_high(self);

        Ok(())
    }
}

#[cfg(feature = "embedded-hal-0")]
impl embedded_hal_0::digital::v2::OutputPin for OutputPin {
    type Error = Infallible;

    fn set_low(&mut self) -> Result<(), Self::Error> {
        embedded_hal::digital::OutputPin::set_low(self)
    }

    fn set_high(&mut self) -> Result<(), Self::Error> {
        embedded_hal::digital::OutputPin::set_high(self)
    }
}

#[cfg(feature = "embedded-hal")]
impl embedded_hal::digital::StatefulOutputPin for OutputPin {
    fn is_set_high(&mut self) -> Result<bool, Self::Error> {
        Ok(OutputPin::is_set_high(self))
    }

    fn is_set_low(&mut self) -> Result<bool, Self::Error> {
        Ok(OutputPin::is_set_low(self))
    }

    fn toggle(&mut self) -> Result<(), Self::Error> {
        OutputPin::toggle(self);

        Ok(())
    }
}

#[cfg(feature = "embedded-hal")]
impl embedded_hal::digital::OutputPin for IoPin {
    fn set_low(&mut self) -> Result<(), Self::Error> {
        IoPin::set_low(self);

        Ok(())
    }

    fn set_high(&mut self) -> Result<(), Self::Error> {
        IoPin::set_high(self);

        Ok(())
    }
}

#[cfg(feature = "embedded-hal-0")]
impl embedded_hal_0::digital::v2::OutputPin for IoPin {
    type Error = Infallible;

    fn set_low(&mut self) -> Result<(), Self::Error> {
        embedded_hal::digital::OutputPin::set_low(self)
    }

    fn set_high(&mut self) -> Result<(), Self::Error> {
        embedded_hal::digital::OutputPin::set_high(self)
    }
}

#[cfg(feature = "embedded-hal")]
impl embedded_hal::digital::StatefulOutputPin for IoPin {
    fn is_set_high(&mut self) -> Result<bool, Self::Error> {
        Ok(IoPin::is_high(self))
    }

    fn is_set_low(&mut self) -> Result<bool, Self::Error> {
        Ok(IoPin::is_low(self))
    }

    fn toggle(&mut self) -> Result<(), Self::Error> {
        IoPin::toggle(self);

        Ok(())
    }
}

#[cfg(feature = "embedded-hal-0")]
impl embedded_hal_0::PwmPin for OutputPin {
    type Duty = f64;

    fn disable(&mut self) {
        let _ = self.clear_pwm();
    }

    fn enable(&mut self) {
        let _ = self.set_pwm_frequency(self.frequency, self.duty_cycle);
    }

    fn get_duty(&self) -> Self::Duty {
        self.duty_cycle
    }

    fn get_max_duty(&self) -> Self::Duty {
        1.0
    }

    fn set_duty(&mut self, duty: Self::Duty) {
        self.duty_cycle = duty.clamp(0.0, 1.0);

        if self.soft_pwm.is_some() {
            let _ = self.set_pwm_frequency(self.frequency, self.duty_cycle);
        }
    }
}

#[cfg(feature = "embedded-hal-0")]
impl embedded_hal_0::PwmPin for IoPin {
    type Duty = f64;

    fn disable(&mut self) {
        let _ = self.clear_pwm();
    }

    fn enable(&mut self) {
        let _ = self.set_pwm_frequency(self.frequency, self.duty_cycle);
    }

    fn get_duty(&self) -> Self::Duty {
        self.duty_cycle
    }

    fn get_max_duty(&self) -> Self::Duty {
        1.0
    }

    fn set_duty(&mut self, duty: Self::Duty) {
        self.duty_cycle = duty.clamp(0.0, 1.0);

        if self.soft_pwm.is_some() {
            let _ = self.set_pwm_frequency(self.frequency, self.duty_cycle);
        }
    }
}