93 lines
2.1 KiB
C#
93 lines
2.1 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.ComponentModel;
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using System.IO;
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using System.IO.MemoryMappedFiles;
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using Essgee.EventArguments;
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namespace Essgee.Emulation.ExtDevices.Nintendo
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{
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[Description("Game Boy (Link Cable)")]
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//todo Unity [ElementPriority(1)]
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public class GameBoyIPC : ISerialDevice
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{
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// TODO: ensure correct mmf/accessor disposal?
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const string ipcName = "EssgeeGBLink";
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const int ipcLength = 16;
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const int ipcBaseOffsetSerialData = 0;
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//
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public event EventHandler<SaveExtraDataEventArgs> SaveExtraData;
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protected virtual void OnSaveExtraData(SaveExtraDataEventArgs e) { SaveExtraData?.Invoke(this, e); }
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MemoryMappedFile mmf;
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MemoryMappedViewAccessor accessor;
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bool ipcConnectionExists;
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int ipcOffsetSelf, ipcOffsetRemote;
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public GameBoyIPC()
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{
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mmf = null;
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accessor = null;
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ipcConnectionExists = false;
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ipcOffsetSelf = ipcOffsetRemote = 0;
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}
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public void Initialize()
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{
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//
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}
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public void Shutdown()
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{
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if (ipcConnectionExists)
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{
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accessor.Flush();
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accessor.Dispose();
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mmf.Dispose();
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ipcConnectionExists = false;
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}
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}
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private void EstablishIPCConnection()
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{
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if (ipcConnectionExists) return;
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try
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{
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// Try to open existing mapped file; if it exists, assume other instance is first machine
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mmf = MemoryMappedFile.OpenExisting(ipcName);
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ipcOffsetSelf = ipcBaseOffsetSerialData + 1;
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ipcOffsetRemote = ipcBaseOffsetSerialData + 0;
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}
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catch (FileNotFoundException)
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{
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// Mapped file does not yet exist, create file and assume this instance is first machine
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mmf = MemoryMappedFile.CreateOrOpen(ipcName, ipcLength);
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ipcOffsetSelf = ipcBaseOffsetSerialData + 0;
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ipcOffsetRemote = ipcBaseOffsetSerialData + 1;
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}
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accessor = mmf.CreateViewAccessor(0, ipcLength, MemoryMappedFileAccess.ReadWrite);
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ipcConnectionExists = true;
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}
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public byte ExchangeBit(int left, byte data)
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{
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if (!ipcConnectionExists) EstablishIPCConnection();
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accessor.Write(ipcOffsetSelf, data);
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return accessor.ReadByte(ipcOffsetRemote);
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}
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}
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}
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