/**
* <summary>
* Send first message in tx fifo
* </summary>
*
* @throws USBtinException On serial port errors
*/
protected void SendFirstTXFifoMessage()
{
if (fifoTX.Count == 0)
{
return;
}
CANMessage canmsg = fifoTX.First.Value;
try
{
serialPort.Write(encoding.GetBytes(canmsg.ToString() + "\r"), 0, 1);
}
catch (Exception e)
{
throw new USBtinException(e.Message);
}
}
/**
* <summary>
* Handle serial port event.
* Read single byte and check for end of line character.
* If end of line is reached, parse command and dispatch it.
* </summary>
*
* <param name="e">Serial port event args</param>
*/
private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
SerialPort s = (SerialPort)sender;
try
{
byte[] buffer = null;
s.Read(buffer, 0, s.BytesToRead);
foreach (byte b in buffer)
{
if ((b == '\r') & incomingMessage.Length > 0)
{
string message = incomingMessage.ToString();
char cmd = message[0];
// check if this is a CAN message
if (cmd == 't' || cmd == 'T' || cmd == 'r' || cmd == 'R')
{
// create CAN message from message string
CANMessage canmsg = new CANMessage(message);
// give the CAN message to the listeners
foreach (ICANMessageListener listener in listeners)
{
listener.ReceiveCANMessage(canmsg);
}
}
else if ((cmd == 'z') || (cmd == 'Z'))
{
// remove first message from transmit fifo and send next one
fifoTX.RemoveFirst();
try
{
SendFirstTXFifoMessage();
}
catch (USBtinException)
{
//System.err.println(ex);
}
}
incomingMessage.Length = 0;
}
else if (b == 0x07)
{
// resend first element from tx fifo
try
{
SendFirstTXFifoMessage();
}
catch (USBtinException)
{
//System.err.println(ex);
}
}
else if (b != '\r')
{
incomingMessage.Append((char)b);
}
}
}
catch (Exception ex)
{
throw new USBtinException(ex.Message);
}
}