Trait spectrusty::peripherals::parallel::ParallelPortDevice

pub trait ParallelPortDevice {
    type Timestamp: Sized;

    fn write_data(&mut self, data: u8, timestamp: Self::Timestamp);
    fn write_strobe(&mut self, strobe: bool, timestamp: Self::Timestamp) -> bool;
    fn poll_busy(&mut self) -> bool;
    fn next_frame(&mut self, eof_timestamp: Self::Timestamp);
}

An interface for emulating communication between a Spectrum’s or other peripherals’ hardware port and remote parallel devices.

Emulators of peripheral devices should implement this trait.

Methods of this trait are being called by bus devices implementing parallel port communication.

Required Associated Types

type Timestamp: Sized

Required Methods

fn write_data(&mut self, data: u8, timestamp: Self::Timestamp)

A device receives a byte written to the parallel data port.

fn write_strobe(&mut self, strobe: bool, timestamp: Self::Timestamp) -> bool

A device receives a changed STROBE bit status. strobe is true if the STROBE went high, false when it went low.

Should return the BUSY status signal:

• true if the BUSY signal is high,
• false when it’s low.

fn poll_busy(&mut self) -> bool

This method is being called once every frame, near the end of it, and should return a BUSY signal state. Returns true if the BUSY signal is high, and false when it’s low.

fn next_frame(&mut self, eof_timestamp: Self::Timestamp)

Called when the current frame ends to allow emulators to wrap stored timestamps.

Implementors

impl<T> ParallelPortDevice for NullParallelPort<T>

type Timestamp = T

impl<T, W> ParallelPortDevice for ParallelPortWriter<T, W>where
    T: TimestampOps,
    W: Write,

type Timestamp = T