mirror of
https://github.com/RetroDECK/Supermodel.git
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130 lines
3 KiB
C++
130 lines
3 KiB
C++
/**
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** Supermodel
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** A Sega Model 3 Arcade Emulator.
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** Copyright 2011 Bart Trzynadlowski, Nik Henson
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**
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** This file is part of Supermodel.
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**
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** Supermodel is free software: you can redistribute it and/or modify it under
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** the terms of the GNU General Public License as published by the Free
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** Software Foundation, either version 3 of the License, or (at your option)
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** any later version.
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**
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** Supermodel is distributed in the hope that it will be useful, but WITHOUT
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** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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** more details.
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**
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** You should have received a copy of the GNU General Public License along
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** with Supermodel. If not, see <http://www.gnu.org/licenses/>.
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**/
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/*
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* 93C46.h
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*
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* Header file defining the C93C46 class: 93C46 EEPROM.
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*/
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#ifndef INCLUDED_93C46_H
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#define INCLUDED_93C46_H
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#include "BlockFile.h"
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#include "Types.h"
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/*
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* C93C46:
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*
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* 93C46 serial EEPROM.
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*/
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class C93C46
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{
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public:
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/*
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* SaveState(SaveState):
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*
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* Saves an image of the current device state.
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*
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* Parameters:
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* SaveState Block file to save state information to.
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*/
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void SaveState(CBlockFile *SaveState);
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/*
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* LoadState(SaveState):
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*
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* Loads and a state image.
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*
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* Parameters:
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* SaveState Block file to load state information from.
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*/
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void LoadState(CBlockFile *SaveState);
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/*
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* Clear(void):
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*
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* Clears the EEPROM contents by writing all 1's.
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*/
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void Clear(void);
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/*
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* Write(pinCS, pinCLK, pinDI):
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*
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* Write to the EEPROM. All inputs must be either 0 or 1 only!
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*
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* Parameters:
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* pinCS Chip select.
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* pinCLK Serial data clock.
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* pinDI Serial data input.
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*/
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void Write(unsigned pinCS, unsigned pinCLK, unsigned pinDI);
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/*
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* Read(void):
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*
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* Read from the EEPROM.
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*
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* Returns:
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* The serial data output bit (either a 1 or 0).
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*/
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unsigned Read(void);
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/*
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* Reset(void):
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*
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* Resets the device, putting it into a locked state. Does not modify the
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* memory.
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*/
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void Reset(void);
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/*
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* Init(void):
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*
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* One-time initialization of the context. Must be called prior to all
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* other members.
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*/
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void Init(void);
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/*
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* C93C46(void):
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* ~C93C46(void):
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*
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* Constructor and destructor.
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*/
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C93C46(void);
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~C93C46(void);
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private:
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UINT16 regs[64]; // memory: 64 16-bit registers
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unsigned CS, CLK, DI, DO; // pins
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UINT32 bitBufferOut; // bits to be shifted out
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UINT32 bitBufferIn; // stores bits as they are shifted in
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int bitsOut; // how many bits have been shifted out
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bool receiving; // if true, accepting data, if false, sending data out (read commands)
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unsigned addr; // latched address
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int busyCycles; // when > 0, counts down delay cycles and indicates busy
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bool locked; // whether the EEPROM is in a locked state
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};
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#endif // INCLUDED_93C46_H
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