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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 "NstInpSuborKeyboard.hpp"
namespace Nes
{
namespace Core
{
namespace Input
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
SuborKeyboard::SuborKeyboard(const Cpu& c)
: Device(c,Api::Input::SUBORKEYBOARD)
{
SuborKeyboard::Reset();
}
void SuborKeyboard::Reset()
{
scan = 0;
mode = 0;
}
void SuborKeyboard::SaveState(State::Saver& saver,const byte id) const
{
saver.Begin( AsciiId<'S','K'>::R(0,0,id) ).Write8( mode | (scan << 1) ).End();
}
void SuborKeyboard::LoadState(State::Loader& loader,const dword id)
{
if (id == AsciiId<'S','K'>::V)
{
const uint data = loader.Read8();
mode = data & 0x1;
scan = data >> 1 & 0xF;
if (scan > 12)
scan = 0;
}
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
void SuborKeyboard::Poke(const uint data)
{
if (data & COMMAND_KEY)
{
const uint out = data & COMMAND_SCAN;
if (mode && !out && ++scan > 12)
scan = 0;
mode = out >> 1;
if (data & COMMAND_RESET)
scan = 0;
}
}
uint SuborKeyboard::Peek(uint port)
{
if (port == 0)
{
return 0x00;
}
else if (input && scan < 10)
{
Controllers::SuborKeyboard::callback( input->suborKeyboard, scan, mode );
return ~uint(input->suborKeyboard.parts[scan]) & 0x1E;
}
else
{
return 0x1E;
}
}
}
}
}
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