BizHawk/BizHawk.Emulation/Consoles/Sega/Genesis/Cart/EEPROM.cs

using System;
using System.Globalization;

namespace BizHawk.Emulation.Consoles.Sega
{
	partial class Genesis
	{
		// State
		bool EepromEnabled;

		int EepromSize;
		int EepromAddrMask;
		int SdaInAddr, SdaInBit;
		int SdaOutAddr, SdaOutBit;
		int SclAddr, SclBit;

		int SdaInCurrValue, SclCurrValue;

		// Code

		void InitializeEeprom(GameInfo game)
		{
			if (game["EEPROM"] == false)
				return;

			EepromEnabled = true;
			EepromAddrMask = game.GetHexValue("EEPROM_ADDR_MASK");
			EepromSize = EepromAddrMask + 1;

			var t = game.OptionValue("SDA_IN").Split(':');
			SdaInAddr = int.Parse(t[0], NumberStyles.HexNumber);
			SdaInBit = int.Parse(t[1]);

			t = game.OptionValue("SDA_OUT").Split(':');
			SdaOutAddr = int.Parse(t[0], NumberStyles.HexNumber);
			SdaOutBit = int.Parse(t[1]);

			t = game.OptionValue("SCL").Split(':');
			SclAddr = int.Parse(t[0], NumberStyles.HexNumber);
			SclBit = int.Parse(t[1]);

			SaveRAM = new byte[EepromSize];

			Console.WriteLine("EEPROM enabled. Size: ${0:X} SDA_IN: ${1:X}:{2} SDA_OUT: ${3:X}:{4}, SCL: ${5:X}:{6}",
				EepromSize, SdaInAddr, SdaInBit, SdaOutAddr, SdaOutBit, SclAddr, SclBit);
		}

		void WriteByteEeprom(int address, byte value)
		{
			if (address == SdaInAddr)
			{
				SdaInCurrValue = (value >> SdaInBit) & 1;
				Console.WriteLine("SDA_IN: {0}", SdaInCurrValue);
			}
			if (address == SclAddr)
			{
				SclCurrValue = (value >> SclBit) & 1;
				Console.WriteLine("SCL: {0}", SclCurrValue);
			}

			// todo: logic!

		}
	}
}