protected void DeterminePortConnections ()
{
/*
* There can be up to 3 serial devices connected:
* Spectrometer board
* TEC board
* Display
*
* This code attempts to determine which device is
* on which port (/dev/ttyUSBn where n = 0, 1 or 2
*
* The Spectrometer board defaults to 921600 baud, but
* we want to run it at 115200 baud.
* To change the baud rate to 115200, we use the following
* Open the port at 921600 baud
* Send *PARA:BAUD 115\r
* Send *PARA:SAVE\r
* Send *RST\r
* open up the port at 115200 baud
*
* The TEC board runs at 115200 baud
* The display board runs at 19200 baud
*
* To test a serial port for a device, we can use the following algorithm:
* Open the port at 115200 baud
* Send *para:tectemp?\r
* Read the response
* If there is a response, it can be one of the following:
* 1) a NACK which indicates the board is the Spectrometer board
* 2) the TEC temperature which indicates the board is the TEC board
* If there is no response, this indicates one of the following scenarios:
* 1) The device is the display, which will interpret the command as text to display and not
* return anything, plus it runs at 19200 baud
* 2) The device is the Spectrometer board, running at 921600 baud
*
* The C# code is very flaky at 921600 baud, so we have to use C++ or Java code to
* test and reprogram the Spectrometer board for 115200 baud
*/
foreach (SerialPortInfo spi in dictSerialPorts.Values)
{
spi.portName = "";
}
string[] portNames = SerialPort.GetPortNames ();
Dictionary<string, bool> dictPorts = new Dictionary<string, bool> (portNames.Length);
foreach (string name in portNames)
{
SerialPortLib sc = new SerialPortLib (name, 115200);
if (sc.Open ())
{
dictPorts [name] = false;
//System.Threading.Thread.Sleep (100);
for (int i = 0; (i < 5) && (dictPorts[name] == false); i++)
{
sc.Write ("*para:tectemp?\r");
byte[] resp;
if (sc.Read (out resp, 60, 300))
{
if (resp [0] == NACK)
{
dictSerialPorts[SPEC].portName = name;
specPort = name;
dictPorts [name] = true;
Console.WriteLine ("Found spec board on port " + name);
}
else
{
try
{
string text = System.Text.ASCIIEncoding.ASCII.GetString (resp);
Console.WriteLine ("Received " + text);
string[] words = text.Split (new char[]{' '});
for (int wordIndex = 0; wordIndex < words.Length; wordIndex++)
{
string wordUC = words[wordIndex].ToUpper();
if (wordUC.Contains("TEC"))
{
if (wordIndex + 1 < words.Length)
{
wordUC = words[wordIndex + 1].ToUpper();
if (wordUC.Contains("TEMPERATURE"))
{
dictSerialPorts[TEC].portName = name;
tecPort = name;
dictPorts [name] = true;
Console.WriteLine ("Found tec board on port " + name);
break;
}
}
}
}
}
catch (System.FormatException)
{
}
}
}
else
{
Console.WriteLine ("No response");
// No response. Could be a spectrometer board running at 921600 baud
// or the display, which wouldn't return anything
}
}
sc.Close();
if (dictPorts [name] == false)
{
// The port wasn't assigned to a Spectrometer or TEC board in the above code
// This means the port could be attached to a pectrometer board running at 921600 baud
// or the display, which wouldn't return anything
// See if it is the spectrometer board running at 921600
SerialPortLib port = new SerialPortLib (name, 921600);
if (port.Open ())
{
port.Write ("*IDN?\r");
string buf;
if (port.Read (out buf, 50, 200))
{
Console.WriteLine ("SerialPortLib Read returned " + buf);
if (buf.Contains ("JETI_PIC_VERSA"))
{
Console.WriteLine ("Found spec board on port " + name + " running at 921600 baud");
dictSerialPorts[SPEC].portName = name;
specPort = name;
dictPorts [name] = true;
// We now want to reprogram the spec board to run at 115200 baud
port.Write ("*PARA:BAUD 115\r");
port.Read (out buf, 50, 200);
port.Write ("*PARA:SAVE\r");
port.Read (out buf, 50, 500);
port.Write ("*RST\r");
}
}
port.Close ();
}
}
/*
string response;
if (sc.ReadPort(out response, 40, 200))
{
if (response.Contains("JETI_PIC_VERSA"))
{
Console.WriteLine("Found spec board on port " + name);
specPort = name;
}
}
*/
}
}
foreach (string name in dictPorts.Keys)
{
if (dictPorts [name] == false)
{
dictSerialPorts[DISPLAY].portName = name;
displayPort = name;
Console.WriteLine ("Assigning " + name + " to the display");
}
}
System.Text.StringBuilder sb = new System.Text.StringBuilder ();
foreach (string key in dictSerialPorts.Keys)
{
//Console.WriteLine("Next key in dictSerialPorts is " + key);
SerialPortInfo spi = dictSerialPorts[key];
if (spi.portName != "")
{
sb.AppendFormat ("{0} found on {1}\r", key, spi.portName);
}
}
/*
if (specPort != null)
{
sb.AppendFormat ("Spec. Board found on {0}\r", specPort);
}
if (tecPort != null)
{
sb.AppendFormat ("TEC Board found on {0}\r", tecPort);
}
if (displayPort != null)
{
sb.AppendFormat ("Display found on {0}\r", displayPort);
}
*/
if (sb.Length > 0)
{
AddOutputText(sb.ToString());
//textviewOutput.Buffer.Text += sb.ToString();
}
}
