private void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
SerialPort sp = (SerialPort)sender;
//
try
{
byte[] data = new byte[sp.BytesToRead];
int count = sp.Read(data, 0, data.Length);
if (count > 0)
{
for (int i = 0; i < count; i++)
{
ParseReceivedData(data[i]);
}
}
}
catch (Exception ex)
{
_receiveStep = ReceiveSteps.Free;
if (_currentCommand != null)
{
_currentCommand.EndReceive(false, ex);
_currentCommand = null;
}
}
}
private void ParseReceivedData(byte b)
{
switch (_receiveStep)
{
case ReceiveSteps.DeviceMessageId:
_lastDeviceMessageId = b;
_receiveStep = ReceiveSteps.CommandId;
break;
case ReceiveSteps.CommandId:
_lastCommandID = (SharerCommandID)b;
_receiveStep = ReceiveSteps.SupervisorMessageId;
// to do : handle asynchronous messages
break;
case ReceiveSteps.SupervisorMessageId:
lock (_sentCommands)
{
// command without request
if (_notificationCommand.ContainsKey(_lastCommandID))
{
_currentCommand = (SharerSentCommand)Activator.CreateInstance(_notificationCommand[_lastCommandID]);
_receiveStep = ReceiveSteps.Body;
}
else
{
_currentCommand = _sentCommands.FirstOrDefault((x) => x.CommandID == _lastCommandID && x.SentID == b);
if (_currentCommand == null)
{
_receiveStep = ReceiveSteps.Free;
throw new Exception("Command ID " + _lastCommandID + " not found in history");
}
else
{
_sentCommands.Remove(_currentCommand);
_receiveStep = ReceiveSteps.Body;
}
}
}
break;
case ReceiveSteps.Body:
var decodageDone = _currentCommand.DecodeArgument(b);
if (decodageDone)
{
_currentCommand.EndReceive(true); // indicate that the command has been received
_receiveStep = ReceiveSteps.Free;
switch (_currentCommand.CommandID)
{
case SharerCommandID.Ready:
AsyncNotifyReady();
break;
case SharerCommandID.Error:
break;
}
}
break;
default:
if (b == SHARER_START_COMMAND_CHAR)
{
_receiveStep = ReceiveSteps.DeviceMessageId;
}
else
{
// to do : store value for user stream
}
break;
}
}
