void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
while (serialPort.BytesToRead > 0)
{
if (currentCommand == null)
{
var code = (byte)serialPort.ReadByte();
if (!pendingCommands.TryGetValue(code, out currentCommand))
{
throw new InvalidOperationException("Unexpected command response.");
}
}
var response = currentCommand.Response;
var bytesRead = serialPort.Read(response, currentCommand.Offset, response.Length - currentCommand.Offset);
currentCommand.Offset += bytesRead;
if (currentCommand.Offset == response.Length)
{
var userState = currentCommand.UserState;
byte code = currentCommand.Code;
lock (pendingCommands)
{
pendingCommands.Remove(currentCommand.Code);
}
currentCommand = null;
OnCommandCompleted(new CommandCompletedEventArgs(code, response, null, false, userState));
}
}
}
public void CommandAsync(byte[] command, int responseSize, object userState)
{
if (command == null)
{
throw new ArgumentNullException("command");
}
if (command.Length < 1)
{
throw new ArgumentException("Command bytes must not be empty.");
}
var code = command[0];
var response = new byte[responseSize];
var pendingCommand = new PendingCommand(code, response, userState);
lock (pendingCommands)
{
if (pendingCommands.Count > 0)
{
throw new TimeoutException("Communication manager adding a new command before response :" + "Trying to place a request a " + code + " when there is a " + pendingCommands.First().Key + " on the response queue");
}
pendingCommands.Add(code, pendingCommand);
}
serialPort.Write(command, 0, command.Length);
}