src/device_bus.rs


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use crate::*;

pub trait Device {
    fn read(&mut self, port: u8) -> u8;
    fn write(&mut self, port: u8, value: u8) -> Option<Signal>;
    fn wake(&mut self) -> bool;
}

impl Device for () {
    fn read(&mut self, _: u8) -> u8 { 0 }
    fn write(&mut self, _: u8, _: u8) -> Option<Signal> { None }
    fn wake(&mut self) -> bool { false }
}

pub trait DeviceBus {
    fn read(&mut self, port: u8) -> u8;
    fn write(&mut self, port: u8, value: u8) -> Option<Signal>;
    fn wake(&mut self) -> bool;
}