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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
//
////////////////////////////////////////////////////////////////////////////////////////
#include "NstInpDevice.hpp"
#include "NstInpPartyTap.hpp"
namespace Nes
{
namespace Core
{
namespace Input
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
PartyTap::PartyTap(const Cpu& c)
: Device(c,Api::Input::PARTYTAP)
{
PartyTap::Reset();
}
void PartyTap::Reset()
{
strobe = 0;
state = 0;
mode = 0xE0;
stream = 0;
}
void PartyTap::SaveState(State::Saver& saver,const byte id) const
{
saver.Begin( AsciiId<'P','T'>::R(0,0,id) ).End();
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
void PartyTap::Poke(const uint data)
{
mode = 0xE0 - ((data & 0x4) << 4);
const uint prev = strobe;
strobe = data & 0x1;
if (prev > strobe)
{
if (input)
{
Controllers::PartyTap::callback( input->partyTap );
state = input->partyTap.units;
input = NULL;
}
stream = state;
}
}
uint PartyTap::Peek(uint port)
{
if (port)
{
port = stream & 0x1C;
stream = stream >> 3 | mode;
}
return port;
}
}
}
}
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