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////////////////////////////////////////////////////////////////////////////////////////
//
// 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_BANDAI_24C0X_H
#define NST_BOARD_BANDAI_24C0X_H
#ifdef NST_PRAGMA_ONCE
#pragma once
#endif
#include <cstring>
namespace Nes
{
namespace Core
{
namespace Boards
{
namespace Bandai
{
template<uint N>
class X24C0X;
template<>
class X24C0X<0>
{
public:
void Stop();
void Reset();
protected:
void LoadState(State::Loader&,byte*,uint);
void SaveState(State::Saver&,dword,const byte*,uint) const;
enum Mode
{
MODE_IDLE,
MODE_DATA,
MODE_ADDRESS,
MODE_READ,
MODE_WRITE,
MODE_ACK,
MODE_NOT_ACK,
MODE_ACK_WAIT,
MODE_MAX
};
struct
{
uint scl;
uint sda;
} line;
Mode mode;
Mode next;
struct
{
uint bit;
uint address;
uint data;
} latch;
ibool rw;
uint output;
public:
uint Read() const
{
return output;
}
};
template<uint N>
class X24C0X : public X24C0X<0>
{
public:
enum
{
SIZE = N
};
void Set(uint,uint);
private:
void Start();
void Rise(uint);
void Fall();
byte mem[SIZE];
public:
X24C0X()
{
std::memset( mem, 0, SIZE );
}
byte* GetData()
{
return mem;
}
const byte* GetData() const
{
return mem;
}
void LoadState(State::Loader& loader)
{
X24C0X<0>::LoadState( loader, mem, SIZE );
}
void SaveState(State::Saver& saver,dword baseChunk) const
{
X24C0X<0>::SaveState( saver, baseChunk, mem, SIZE );
}
void SetScl(uint scl)
{
Set( scl, line.sda );
}
void SetSda(uint sda)
{
Set( line.scl, sda );
}
};
template<uint N>
void X24C0X<N>::Set(const uint scl,const uint sda)
{
if (line.scl && sda < line.sda)
{
Start();
}
else if (line.scl && sda > line.sda)
{
Stop();
}
else if (scl > line.scl)
{
Rise( sda >> 6 );
}
else if (scl < line.scl)
{
Fall();
}
line.scl = scl;
line.sda = sda;
}
typedef X24C0X<128> X24C01;
typedef X24C0X<256> X24C02;
}
}
}
}
#endif
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