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Merge pull request #1 from philipellisis/feature/concurrent-com-port
Feature/concurrent com port
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| using System; | ||
| using System.IO.Ports; | ||
| using System.IO.Pipes; | ||
| using System.Text; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
| using PerCederberg.Grammatica.Runtime; | ||
|
|
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| public class NamedPipeServer | ||
| { | ||
| private SerialPort serialPort; | ||
| private bool isRunning = true; | ||
| private string comPort = ""; | ||
| private const string PipeName = "ComPortServerPipe"; | ||
| CancellationToken clientToken = new CancellationToken(); | ||
| CancellationToken serverToken = new CancellationToken(); | ||
|
|
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| public NamedPipeServer(string comPort) | ||
| { | ||
|
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| this.comPort = comPort; | ||
| serialPort = new SerialPort(comPort, 2000000, Parity.None, 8, StopBits.One); | ||
| serialPort.NewLine = "\r\n"; | ||
| serialPort.ReadTimeout = 500; | ||
| serialPort.WriteTimeout = 500; | ||
| serialPort.Open(); | ||
| serialPort.DtrEnable = true; | ||
| } | ||
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|
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| public void StartServer() | ||
| { | ||
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| Task.Run(async () => | ||
| { | ||
| while (isRunning) | ||
| { | ||
| var serverStream = new NamedPipeServerStream( | ||
| PipeName, | ||
| PipeDirection.InOut, | ||
| NamedPipeServerStream.MaxAllowedServerInstances, | ||
| PipeTransmissionMode.Byte, | ||
| PipeOptions.Asynchronous); | ||
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| Console.WriteLine("Waiting for client connection..."); | ||
| await serverStream.WaitForConnectionAsync(serverToken); | ||
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| HandleClientConnectionAsync(serverStream); | ||
| } | ||
| }); | ||
| } | ||
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| private async Task HandleClientConnectionAsync(NamedPipeServerStream serverStream) | ||
| { | ||
| bool completed = false; | ||
| while (isRunning && !completed && serverStream.IsConnected) | ||
| { | ||
| try | ||
| { | ||
| var request = new byte[1024]; | ||
| int bytesRead = await serverStream.ReadAsync(request, 0, request.Length, clientToken); | ||
| string requestStr = Encoding.UTF8.GetString(request, 0, bytesRead); | ||
|
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| // Process request | ||
| if (requestStr.StartsWith("CONNECT")) | ||
| { | ||
| Console.WriteLine("Requesting Connect"); | ||
| serialPort.Open(); | ||
| serverStream.Write(Encoding.UTF8.GetBytes("OK"), 0, 2); | ||
| } | ||
| else if (requestStr.StartsWith("STOP_SERVER")) | ||
| { | ||
| isRunning = false; | ||
| } | ||
| else if (requestStr.StartsWith("DISCONNECT")) | ||
| { | ||
| serverStream.Disconnect(); | ||
| completed = true; | ||
| Console.WriteLine("Requesting disconnect"); | ||
| } | ||
| else if (requestStr.StartsWith("WRITE")) | ||
| { | ||
| var bytesToWrite = Convert.FromBase64String(requestStr.Substring(6)); | ||
| serialPort.Write(bytesToWrite, 0, bytesToWrite.Length); | ||
| serverStream.Write(Encoding.UTF8.GetBytes("OK"), 0, 2); | ||
| } | ||
| else if (requestStr.StartsWith("READLINE")) | ||
| { | ||
| string response = serialPort.ReadLine(); | ||
| serverStream.Write(Encoding.UTF8.GetBytes(response), 0, response.Length); | ||
| } | ||
| else if (requestStr.StartsWith("CHECK")) | ||
| { | ||
| string response = serialPort.IsOpen ? "TRUE" : "FALSE"; | ||
| serverStream.Write(Encoding.UTF8.GetBytes(response), 0, response.Length); | ||
| } | ||
| else if (requestStr.StartsWith("COMPORT")) | ||
| { | ||
| Console.WriteLine("Requesting com port"); | ||
| serverStream.Write(Encoding.UTF8.GetBytes(this.comPort), 0, this.comPort.Length); | ||
| } | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| serverStream.Disconnect(); | ||
| isRunning = false; | ||
| } | ||
| finally | ||
| { | ||
| //Console.WriteLine("cleaning up, closing ports"); | ||
| } | ||
|
|
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| } | ||
| if (isRunning == false) | ||
| { | ||
|
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| serverStream.Disconnect(); | ||
| serverStream.Close(); | ||
|
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| } | ||
| } | ||
|
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| public void StopServer() | ||
| { | ||
| serialPort.Close(); | ||
| isRunning = false; | ||
| clientToken.ThrowIfCancellationRequested(); | ||
| serverToken.ThrowIfCancellationRequested(); | ||
| Thread.Sleep(300); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| using System; | ||
| using System.IO.Pipes; | ||
| using System.Text; | ||
| using System.Threading; | ||
|
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| public class PinOneCommunication | ||
| { | ||
| private NamedPipeClientStream pipeClient; | ||
| private NamedPipeServer server = null; | ||
| private string pipeName = "ComPortServerPipe"; | ||
| private string COMPort = ""; | ||
|
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| public PinOneCommunication(String COMPort) | ||
| { | ||
| this.COMPort = COMPort; | ||
| } | ||
|
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| public bool ConnectToServer() | ||
| { | ||
| try | ||
| { | ||
| pipeClient = new NamedPipeClientStream(".", pipeName, PipeDirection.InOut, PipeOptions.None); | ||
| pipeClient.Connect(100); | ||
| return true; | ||
| } | ||
| catch (Exception) | ||
| { | ||
| return false; | ||
| } | ||
| } | ||
|
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| public bool DisconnectFromServer() | ||
| { | ||
| Disconnect(); | ||
| if (server !=null) | ||
| { | ||
| server.StopServer(); | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
|
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| public bool CreateServer() | ||
| { | ||
| try | ||
| { | ||
| if (!COMPort.IsNullOrEmpty()) | ||
| { | ||
| server = new NamedPipeServer(COMPort); | ||
| Thread serverThread = new Thread(server.StartServer); | ||
| serverThread.IsBackground = true; | ||
| serverThread.Start(); | ||
| Thread.Sleep(300); | ||
| return true; | ||
| } | ||
| } | ||
| catch (Exception) | ||
| { | ||
| return false; | ||
| } | ||
|
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| return false; | ||
| } | ||
| public bool isComPortConnected() | ||
| { | ||
| SendMessage("CHECK"); | ||
| var response = ReadMessage(); | ||
| return response == "TRUE"; | ||
| } | ||
| public void Disconnect() | ||
| { | ||
| SendMessage("DISCONNECT"); | ||
| } | ||
|
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| public void Write(byte[] bytesToWrite) | ||
| { | ||
| string base64Bytes = Convert.ToBase64String(bytesToWrite); | ||
| SendMessage($"WRITE {base64Bytes}"); | ||
| ReadMessage(); // Expect OK | ||
| } | ||
|
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| public string ReadLine() | ||
| { | ||
| SendMessage("READLINE"); | ||
| return ReadMessage(); | ||
| } | ||
|
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| public string GetCOMPort() | ||
| { | ||
| SendMessage("COMPORT"); | ||
| return ReadMessage(); | ||
| } | ||
|
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| private void SendMessage(string message) | ||
| { | ||
| try | ||
| { | ||
| byte[] request = Encoding.UTF8.GetBytes(message); | ||
| pipeClient.Write(request, 0, request.Length); | ||
| } | ||
| catch (Exception) | ||
| { | ||
| if (CreateServer() && ConnectToServer()) | ||
| { | ||
| byte[] request = Encoding.UTF8.GetBytes(message); | ||
| pipeClient.Write(request, 0, request.Length); | ||
| } | ||
| else | ||
| { | ||
| throw new Exception("Unable to connect to board"); | ||
| } | ||
|
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| } | ||
|
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| } | ||
|
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| private string ReadMessage() | ||
| { | ||
| try | ||
| { | ||
| var response = new byte[1024]; | ||
| int bytesRead = pipeClient.Read(response, 0, response.Length); | ||
| return Encoding.UTF8.GetString(response, 0, bytesRead); | ||
| } | ||
| catch (Exception) | ||
| { | ||
| if( CreateServer() && ConnectToServer()) | ||
| { | ||
| return ReadMessage(); | ||
|
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| } else | ||
| { | ||
| return ""; | ||
| } | ||
| } | ||
|
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| } | ||
| } |
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