mirror of https://github.com/stella-emu/stella.git
91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
//============================================================================
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//
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// SSSS tt lll lll
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// SS SS tt ll ll
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// SS tttttt eeee ll ll aaaa
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// SSSS tt ee ee ll ll aa
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// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-2010 by Bradford W. Mott and the Stella Team
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//
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// See the file "License.txt" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//
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// $Id$
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//============================================================================
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#include "MT24LC256.hxx"
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#include "System.hxx"
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#include "SaveKey.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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SaveKey::SaveKey(Jack jack, const Event& event, const System& system,
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const string& eepromfile)
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: Controller(jack, event, system, Controller::SaveKey),
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myEEPROM(NULL)
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{
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myEEPROM = new MT24LC256(eepromfile, system);
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myDigitalPinState[One] = myDigitalPinState[Two] = true;
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myAnalogPinValue[Five] = myAnalogPinValue[Nine] = maximumResistance;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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SaveKey::~SaveKey()
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{
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delete myEEPROM;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool SaveKey::read(DigitalPin pin)
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{
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// We need to override the Controller::read() method, since the timing
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// of the actual read is important for the EEPROM (we can't just read
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// 60 times per second in the ::update() method)
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switch(pin)
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{
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// Pin 3: EEPROM SDA
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// input data from the 24LC256 EEPROM using the I2C protocol
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case Three:
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return myDigitalPinState[Three] = myEEPROM->readSDA();
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default:
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return Controller::read(pin);
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}
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void SaveKey::write(DigitalPin pin, bool value)
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{
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// Change the pin state based on value
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switch(pin)
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{
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// Pin 3: EEPROM SDA
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// output data to the 24LC256 EEPROM using the I2C protocol
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case Three:
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myDigitalPinState[Three] = value;
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myEEPROM->writeSDA(value);
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break;
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// Pin 4: EEPROM SCL
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// output clock data to the 24LC256 EEPROM using the I2C protocol
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case Four:
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myDigitalPinState[Four] = value;
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myEEPROM->writeSCL(value);
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break;
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default:
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break;
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}
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void SaveKey::systemCyclesReset()
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{
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// The EEPROM keeps track of cycle counts, and needs to know when the
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// cycles are reset
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myEEPROM->systemCyclesReset();
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}
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