mirror of
https://github.com/0ldsk00l/nestopia.git
synced 2025-04-02 10:31:51 -04:00
171 lines
3.5 KiB
C++
171 lines
3.5 KiB
C++
////////////////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Nestopia - NES/Famicom emulator written in C++
|
|
//
|
|
// Copyright (C) 2003-2008 Martin Freij
|
|
//
|
|
// This file is part of Nestopia.
|
|
//
|
|
// Nestopia is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 2 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// Nestopia is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Nestopia; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
//
|
|
////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef NST_BOARD_MMC3_H
|
|
#define NST_BOARD_MMC3_H
|
|
|
|
#ifdef NST_PRAGMA_ONCE
|
|
#pragma once
|
|
#endif
|
|
|
|
#include "../NstTimer.hpp"
|
|
|
|
namespace Nes
|
|
{
|
|
namespace Core
|
|
{
|
|
namespace Boards
|
|
{
|
|
class NST_NO_VTABLE Mmc3 : public Board
|
|
{
|
|
class BaseIrq
|
|
{
|
|
public:
|
|
|
|
enum
|
|
{
|
|
CLOCK_FILTER = 16
|
|
};
|
|
|
|
void Reset(bool);
|
|
void LoadState(State::Loader&);
|
|
void SaveState(State::Saver&,dword) const;
|
|
|
|
private:
|
|
|
|
uint count;
|
|
uint latch;
|
|
ibool reload;
|
|
ibool enabled;
|
|
const ibool persistent;
|
|
|
|
public:
|
|
|
|
explicit BaseIrq(bool p)
|
|
: persistent(p) {}
|
|
|
|
NST_FORCE_INLINE bool Clock()
|
|
{
|
|
const bool tmp = count || reload;
|
|
|
|
if (!count || reload)
|
|
{
|
|
count = latch;
|
|
}
|
|
else
|
|
{
|
|
--count;
|
|
}
|
|
|
|
reload = false;
|
|
return (tmp | persistent) && !count && enabled;
|
|
}
|
|
|
|
void SetLatch(uint data)
|
|
{
|
|
latch = data;
|
|
}
|
|
|
|
void Reload()
|
|
{
|
|
reload = true;
|
|
}
|
|
|
|
void Enable()
|
|
{
|
|
enabled = true;
|
|
}
|
|
|
|
void Disable(Cpu& cpu)
|
|
{
|
|
enabled = false;
|
|
cpu.ClearIRQ();
|
|
}
|
|
};
|
|
|
|
public:
|
|
|
|
enum Revision
|
|
{
|
|
REV_A,
|
|
REV_B,
|
|
REV_C
|
|
};
|
|
|
|
template<uint Delay=0, uint ClockFilter=BaseIrq::CLOCK_FILTER>
|
|
struct Irq : Timer::A12<BaseIrq,ClockFilter,Delay>
|
|
{
|
|
Irq(Cpu& c,Ppu& p,bool persistent)
|
|
: Timer::A12<BaseIrq,ClockFilter,Delay>(c,p,persistent) {}
|
|
};
|
|
|
|
protected:
|
|
|
|
explicit Mmc3(const Context&,Revision=REV_B);
|
|
|
|
void SubReset(bool);
|
|
void SubSave(State::Saver&) const;
|
|
void SubLoad(State::Loader&,dword);
|
|
void Sync(Event,Input::Controllers*);
|
|
|
|
void UpdatePrg();
|
|
void UpdateChr() const;
|
|
|
|
virtual void NST_FASTCALL UpdatePrg(uint,uint);
|
|
virtual void NST_FASTCALL UpdateChr(uint,uint) const;
|
|
|
|
NES_DECL_POKE( 8000 );
|
|
NES_DECL_POKE( 8001 );
|
|
NES_DECL_POKE( A001 );
|
|
NES_DECL_POKE( C000 );
|
|
NES_DECL_POKE( C001 );
|
|
NES_DECL_POKE( E000 );
|
|
NES_DECL_POKE( E001 );
|
|
|
|
enum
|
|
{
|
|
CTRL1_WRAM_READONLY = 0x40,
|
|
CTRL1_WRAM_ENABLED = 0x80,
|
|
CTRL1_WRAM = CTRL1_WRAM_ENABLED|CTRL1_WRAM_READONLY
|
|
};
|
|
|
|
struct Regs
|
|
{
|
|
uint ctrl0;
|
|
uint ctrl1;
|
|
} regs;
|
|
|
|
struct
|
|
{
|
|
byte prg[4];
|
|
byte chr[8];
|
|
} banks;
|
|
|
|
Irq<> irq;
|
|
};
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|