/*
* /// <summary>
* /// Requests all 6 voltage measurements for the specified FEB HDMI channel.
* /// <para>The voltage measurement is returned on onVoltageChanged event</para>
* /// <para>onVoltageChanged returns double[6] showing all 6 HDMI values in the order Trim0-Trim3, Bias, LED</para>
* /// <para>If inTestMode=true then onVoltageChanged is asserted with VoltageChangedEventArgs.Voltage = voltageDefaultValue</para>
* /// </summary>
* /// <param name="channelNumber">the integer number 0-15, of the FEB HDMI channel to read</param>
* internal void GetVoltage(int HDMIchannelNumber = 0)
* {
* if (inTestMode)
* {
* VoltageChangedEventsArgs VoltArgs = new VoltageChangedEventsArgs();
* if (OnVoltageChanged != null)
* VoltArgs.HDMIchannel = HDMIchannelNumber;
* OnVoltageChanged(this, VoltArgs);
* return;
* }
*
* if (HDMIchannelNumber < 0 || HDMIchannelNumber > 15)
* throw new Exception(scopeName + ": GetVoltage. channel number " + HDMIchannelNumber + " is out of bounds. Must be 0-15");
*
* // For assistance with DMM VISA See:
* //https://www.keysight.com/upload/cmc_upload/All/iols_15_5_visa_users_guide.pdf
* //https://literature.cdn.keysight.com/litweb/pdf/34972-90001.pdf?id=1837993
* //https://www.keysight.com/upload/cmc_upload/All/34970-90003_users.pdf * best for programming
* //http://instructor.physics.lsa.umich.edu/adv-labs/Tools_Resources/HP%2034970A%20quick%20reference%20guide.pdf
* //http://literature.cdn.keysight.com/litweb/pdf/5989-6338EN.pdf
* string range = FEB.HDMIs[HDMIchannelNumber].Trim0.myDmmId + ":" + FEB.HDMIs[HDMIchannelNumber].LED.myDmmId;
*
* /* bool useAsync = false;
* if (useAsync == true) //use asyncornous read and write. This worked for the Tek scope but fails now that the DMM is reading ranges.
* {
* write("MEASure:VOLTage:DC? (@" + range + ")\n"); // AUTO ,MAX, (@101)"); //,316)");
* WriteComplete += readVoltage;
* }
* else //use Sync read and write Added Jan 2017 Stephen to avoid errors with ivi.VISA
* { */
/*
* simpleReadWrite("MEASure:VOLTage:DC? (@" + range + ")\n");
* // }
* }
*/
private static void simpleReadWrite(string command)
{
try
{
string textToWrite = ReplaceCommonEscapeSequences(command);
mbSession.RawIO.Write(textToWrite);
string DMMresponse = "";
int timeout = 0;
while (DMMresponse == "" && timeout < 100)
{
Application.DoEvents();
DMMresponse = InsertCommonEscapeSequences(mbSession.RawIO.ReadString());
timeout++;
}
Console.WriteLine($"simpleReadWrite timeout = {timeout}. DMM response is <{DMMresponse}>");
if (DMMresponse != "")
{
readArgs e = new readArgs();
e.text = InsertCommonEscapeSequences(DMMresponse);
parseVoltage(null, e);
}
}
catch (Exception exp)
{
MessageBox.Show(exp.Message);
}
}
private static void OnReadComplete(IVisaAsyncResult result)
{
try
{
string responseString = mbSession.RawIO.EndReadString(result);
if (ReadComplete != null)
{
readArgs e = new readArgs();
e.text = InsertCommonEscapeSequences(responseString);
ReadComplete(null, e);
}
}
catch (Exception exp)
{
if (ReadComplete != null)
{
readArgs e = new readArgs();
e.text = InsertCommonEscapeSequences(scopeName + ": OnReadComplete failed. " + exp.Message);
ReadComplete(null, e);
}
else
{
//throw new Exception(scopeName + ": OnReadComplete failed. " + exp.Message);
}
}
}
private static void parseVoltage(object sender, readArgs e)
{
VoltageChangedEventsArgs VoltArgs = new VoltageChangedEventsArgs();
try
{
ReadComplete -= parseVoltage;
//expected result = :MEASUREMENT:MEAS1:VALUE 3.5414E0\n
string rawResponse = RemoveCommonEscapeSequences(e.text);
string[] response = rawResponse.Split(',');
VoltArgs.Voltage = new double[response.Length];
for (int i = 0; i < response.Length; i++)
{
VoltArgs.Voltage[i] = double.Parse(response[i]);
}
VoltArgs.isValid = (response.Length > 0); // 9.9E37 is the scope return value for invalid measurement.
}
catch (Exception arg)
{
VoltArgs.isValid = false;
}
OnVoltageChanged?.Invoke(null, VoltArgs);
}