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use rppal::gpio::{Gpio, Level, Pin};
pub trait Device {
fn close(self);
fn is_active(&self) -> bool;
}
#[macro_export]
macro_rules! impl_device {
() => {
pub fn is_active(&self) -> bool {
self.value()
}
pub fn close(self) {
drop(self)
}
}
}
#[derive(Debug)]
pub struct GpioDevice {
pin: Pin,
active_state: bool,
inactive_state: bool,
}
macro_rules! impl_gpio_device {
() => {
pub fn pin(&self) -> u8 {
self.pin.pin()
}
}
}
impl GpioDevice {
pub fn new(pin: u8) -> GpioDevice {
match Gpio::new() {
Err(e) => panic!("{:?}", e),
Ok(gpio) => match gpio.get(pin) {
Err(e) => panic!("{:?}", e),
Ok(pin) => GpioDevice {
pin,
active_state: true,
inactive_state: false,
},
},
}
}
pub fn value(&self) -> bool {
self.state_to_value()
}
fn state_to_value(&self) -> bool {
match self.pin.read() {
Level::High => self.active_state,
Level::Low => !self.active_state,
}
}
impl_device!();
impl_gpio_device!();
}