private void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
byte c;
while (serialPort.BytesToRead > 0)
{
bool acceptByte = false;
c = (byte)serialPort.ReadByte();
switch (receiverState)
{
case SerialReceiverStates.IDLE_RX_STATE:
if (APP_MAGIC_SYMBOL == c)
{
receiverState = SerialReceiverStates.SOF_RX_STATE;
currentReceiverMessage.Clear();
checkSum = 0;
}
break;
case SerialReceiverStates.SOF_RX_STATE:
if (SOF[1] == c)
{
receiverState = SerialReceiverStates.DATA_RX_STATE;
}
else
{
receiverState = SerialReceiverStates.IDLE_RX_STATE;
}
break;
case SerialReceiverStates.DATA_RX_STATE:
if (APP_MAGIC_SYMBOL == c)
{
receiverState = SerialReceiverStates.MAGIC_RX_STATE;
}
else
{
acceptByte = true;
}
break;
case SerialReceiverStates.MAGIC_RX_STATE:
if (APP_MAGIC_SYMBOL == c)
{
receiverState = SerialReceiverStates.DATA_RX_STATE;
acceptByte = true;
}
else if (EOF[1] == c)
{
receiverState = SerialReceiverStates.EOF_RX_STATE;
}
else
{
receiverState = SerialReceiverStates.IDLE_RX_STATE;
Debug.Print("INVALID FRAME RECEIVED IN " + PortName);
}
break;
case SerialReceiverStates.EOF_RX_STATE:
if (checkSum == c)
{
receiverState = SerialReceiverStates.IDLE_RX_STATE;
InputMessage inputMessage = new InputMessage();
inputMessage.FromBinary(currentReceiverMessage.ToArray());
OnOperationReceived(inputMessage);
}
else
{
receiverState = SerialReceiverStates.IDLE_RX_STATE;
Debug.Print("INVALID CHECKSUM RECEIVED IN " + PortName);
}
break;
default:
break;
}
checkSum += c;
if (acceptByte)
{
currentReceiverMessage.Add(c);
}
}
}
private void OnOperationReceived(InputMessage oper)
{
if (ConnectionState == ConnectionStates.Identifying)
{
if (oper.Content.OpCode == Operation.OPCodes.MacReadResponse)
{
this.NodeAddress = oper.Content.SourceAddress;
this.NodeType = this.NodeAddress == MasterAddress ? NodeTypes.Master : NodeTypes.Slave;
this.ConnectionState = ConnectionStates.Connected;
}
}
if (OperationReceived != null)
OperationReceived(this, oper);
}