Oops, forgot to include the SaveKey class.

git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@1490 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba

stella/src/emucore/SaveKey.cxx

@@ -0,0 +1,94 @@
+//============================================================================
+//
+//   SSSS    tt          lll  lll       
+//  SS  SS   tt           ll   ll        
+//  SS     tttttt  eeee   ll   ll   aaaa 
+//   SSSS    tt   ee  ee  ll   ll      aa
+//      SS   tt   eeeeee  ll   ll   aaaaa  --  "An Atari 2600 VCS Emulator"
+//  SS  SS   tt   ee      ll   ll  aa  aa
+//   SSSS     ttt  eeeee llll llll  aaaaa
+//
+// Copyright (c) 1995-2008 by Bradford W. Mott and the Stella team
+//
+// See the file "license" for information on usage and redistribution of
+// this file, and for a DISCLAIMER OF ALL WARRANTIES.
+//
+// $Id: SaveKey.cxx,v 1.1 2008-04-29 15:49:34 stephena Exp $
+//============================================================================
+
+#include "MT24LC256.hxx"
+#include "System.hxx"
+#include "SaveKey.hxx"
+
+#define DEBUG_SAVEKEY 0
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+SaveKey::SaveKey(Jack jack, const Event& event, const System& system,
+                 const string& eepromfile)
+  : Controller(jack, event, system, Controller::SaveKey),
+    myEEPROM(NULL)
+{
+  myEEPROM = new MT24LC256(eepromfile, system);
+
+  myDigitalPinState[One] = myDigitalPinState[Two] = true;
+  myAnalogPinValue[Five] = myAnalogPinValue[Nine] = maximumResistance;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+SaveKey::~SaveKey()
+{
+  delete myEEPROM;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+bool SaveKey::read(DigitalPin pin)
+{
+  // We need to override the Controller::read() method, since the timing
+  // of the actual read is important for the EEPROM (we can't just read
+  // 60 times per second in the ::update() method)
+  switch(pin)
+  {
+    // Pin 3: EEPROM SDA
+    //        input data from the 24LC256 EEPROM using the I2C protocol
+    case Three:
+      return myDigitalPinState[Three] = myEEPROM->readSDA();
+
+    default:
+      return Controller::read(pin);
+  }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void SaveKey::write(DigitalPin pin, bool value)
+{
+  // Change the pin state based on value
+  switch(pin)
+  {
+    // Pin 3: EEPROM SDA
+    //        output data to the 24LC256 EEPROM using the I2C protocol
+    case Three:
+      if(DEBUG_SAVEKEY)
+        cerr << "SaveKey: value "
+             << value
+             << " written to SDA line at cycle "
+             << mySystem.cycles()
+             << endl;
+      myEEPROM->writeSDA(value);
+      break;
+
+    // Pin 4: EEPROM SCL
+    //        output clock data to the 24LC256 EEPROM using the I2C protocol
+    case Four:
+      if(DEBUG_SAVEKEY)
+        cerr << "SaveKey: value "
+             << value
+             << " written to SCLK line at cycle "
+             << mySystem.cycles()
+             << endl;
+      myEEPROM->writeSCL(value);
+      break;
+
+    default:
+      break;
+  } 
+}

stella/src/emucore/SaveKey.hxx

@@ -0,0 +1,85 @@
+//============================================================================
+//
+//   SSSS    tt          lll  lll       
+//  SS  SS   tt           ll   ll        
+//  SS     tttttt  eeee   ll   ll   aaaa 
+//   SSSS    tt   ee  ee  ll   ll      aa
+//      SS   tt   eeeeee  ll   ll   aaaaa  --  "An Atari 2600 VCS Emulator"
+//  SS  SS   tt   ee      ll   ll  aa  aa
+//   SSSS     ttt  eeeee llll llll  aaaaa
+//
+// Copyright (c) 1995-2008 by Bradford W. Mott and the Stella team
+//
+// See the file "license" for information on usage and redistribution of
+// this file, and for a DISCLAIMER OF ALL WARRANTIES.
+//
+// $Id: SaveKey.hxx,v 1.1 2008-04-29 15:49:34 stephena Exp $
+//============================================================================
+
+#ifndef SAVEKEY_HXX
+#define SAVEKEY_HXX
+
+class MT24LC256;
+
+#include "Control.hxx"
+
+/**
+  Richard Hutchinson's SaveKey "controller", consisting of a 32KB EEPROM
+  accessible using the I2C protocol.
+
+  This code owes a great debt to Alex Herbert's AtariVox documentation and
+  driver code.
+
+  @author  Stephen Anthony
+  @version $Id: SaveKey.hxx,v 1.1 2008-04-29 15:49:34 stephena Exp $
+*/
+class SaveKey : public Controller
+{
+  public:
+    /**
+      Create a new AtariVox controller plugged into the specified jack
+
+      @param jack       The jack the controller is plugged into
+      @param event      The event object to use for events
+      @param system     The system using this controller
+      @param eepromfile The file containing the EEPROM data
+    */
+    SaveKey(Jack jack, const Event& event, const System& system,
+            const string& eepromfile);
+
+    /**
+      Destructor
+    */
+    virtual ~SaveKey();
+
+  public:
+    /**
+      Read the value of the specified digital pin for this controller.
+
+      @param pin The pin of the controller jack to read
+      @return The state of the pin
+    */
+    virtual bool read(DigitalPin pin);
+
+    /**
+      Write the given value to the specified digital pin for this
+      controller.  Writing is only allowed to the pins associated
+      with the PIA.  Therefore you cannot write to pin six.
+
+      @param pin The pin of the controller jack to write to
+      @param value The value to write to the pin
+    */
+    virtual void write(DigitalPin pin, bool value);
+
+    /**
+      Update the entire digital and analog pin state according to the
+      events currently set.
+    */
+    virtual void update() { }
+
+  private:
+    // The EEPROM used in the SaveKey
+    MT24LC256* myEEPROM;
+};
+
+#endif