Macro spectrusty_core::ula_io_contention

macro_rules! ula_io_contention {
    ($mc:expr, $port:expr, $hc:ident, $contention:path) => { ... };
}

This macro is used to implement the ULA I/O contention scheme, for z80emu::Clock::add_io method of VFrameTsCounter. It's being exported for the purpose of performing FUSE tests.

• $mc should be a type implementing MemoryContention trait.
• $port is a port address.
• $hc is an identifier of a mutable variable containing the hc property of a VideoTs timestamp.
• $contention should be a path to the VideoFrame::contention function.

The macro returns a horizontal timestamp pointing after the whole I/O cycle is over. The hc variable is modified to contain a horizontal timestamp indicating when the data R/W operation takes place.