AppleWin/source/NoSlotClock.h
nick_westgate b1bd2e814b More efficient No-Slot-Clock implementation with UINT64.
Cleaned up naming and method semantics.
Made some members public for save/restore state (not yet done).
2010-08-29 10:06:36 +00:00

70 lines
1.8 KiB
C++

/*
AppleWin : An Apple //e emulator for Windows
Copyright (C) 1994-1996, Michael O'Brien
Copyright (C) 1999-2001, Oliver Schmidt
Copyright (C) 2002-2005, Tom Charlesworth
Copyright (C) 2006-2010, Tom Charlesworth, Michael Pohoreski, Nick Westgate
AppleWin 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.
AppleWin 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 AppleWin; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* Description: No Slot Clock/Phantom Clock (Dallas SmartWatch DS1216) emulation
*
* Author: Nick Westgate
*/
#pragma once
class CNoSlotClock
{
class RingRegister64
{
public:
RingRegister64();
RingRegister64(UINT64 data);
void Reset();
void WriteNibble(int data);
void WriteBits(int data, int count);
void WriteBit(int data);
void ReadBit(int& data);
bool CompareBit(int data);
bool NextBit();
UINT64 m_Mask;
UINT64 m_Register;
};
public:
CNoSlotClock();
void Reset();
bool Read(int address, int& data);
void Write(int address);
bool ClockRead(int& data);
void ClockWrite(int address);
bool m_bClockRegisterEnabled;
bool m_bWriteEnabled;
RingRegister64 m_ClockRegister;
RingRegister64 m_ComparisonRegister;
private:
void PopulateClockRegister();
static const UINT64 kClockInitSequence = 0x5CA33AC55CA33AC5;
};