public void performActions()
{
long i = 0, k = 0;
LJUD.IO ioType = 0;
LJUD.CHANNEL channel = 0;
double dblValue = 0, dblCommBacklog = 0, dblUDBacklog = 0;
double scanRate = 2000;
int delayms = 1000;
double numScans = 4000; //2x the expected # of scans (2*scanRate*delayms/1000)
double numScansRequested;
double[] adblData = new double[8000]; //Max buffer size (#channels*numScansRequested)
// Variables to satisfy certain method signatures
int dummyInt = 0;
double dummyDouble = 0;
double[] dummyDoubleArray = { 0 };
//Read and display the UD version.
dblValue = LJUD.GetDriverVersion();
Console.Out.WriteLine("UD Driver Version = {0:0.000}\n\n", dblValue);
try
{
//Open the first found LabJack U3.
u3 = new U3(LJUD.CONNECTION.USB, "0", true); // Connection through USB
//LJUD.ResetLabJack(u3.ljhandle);
//Read and display the hardware version of this U3.
LJUD.eGet(u3.ljhandle, LJUD.IO.GET_CONFIG, LJUD.CHANNEL.HARDWARE_VERSION, ref dblValue, 0);
Console.Out.WriteLine("U3 Hardware Version = {0:0.000}\n\n", dblValue);
//Read and display the firmware version of this U3.
LJUD.eGet(u3.ljhandle, LJUD.IO.GET_CONFIG, LJUD.CHANNEL.FIRMWARE_VERSION, ref dblValue, 0);
Console.Out.WriteLine("U3 Firmware Version = {0:0.000}\n\n", dblValue);
//Start by using the pin_configuration_reset IOType so that all
//pin assignments are in the factory default condition.
LJUD.ePut(u3.ljhandle, LJUD.IO.PIN_CONFIGURATION_RESET, 0, 0, 0);
LJUD.ePut(u3.ljhandle, LJUD.IO.PIN_CONFIGURATION_RESET, 0, 0, 0);
//Configure FIO0 and FIO1 as analog, all else as digital. That means we
//will start from channel 0 and update all 16 flexible bits. We will
//pass a value of b0000000000000011 or d3.
LJUD.ePut(u3.ljhandle, LJUD.IO.PUT_ANALOG_ENABLE_PORT, 0, 3, 16);
//Configure the stream:
//Set the scan rate.
LJUD.AddRequest(u3.ljhandle, LJUD.IO.PUT_CONFIG, LJUD.CHANNEL.STREAM_SCAN_FREQUENCY, scanRate, 0, 0);
//Give the driver a 5 second buffer (scanRate * 2 channels * 5 seconds).
LJUD.AddRequest(u3.ljhandle, LJUD.IO.PUT_CONFIG, LJUD.CHANNEL.STREAM_BUFFER_SIZE, scanRate * 2 * 5, 0, 0);
//Configure reads to retrieve whatever data is available without waiting (wait mode LJUD.STREAMWAITMODES.NONE).
//See comments below to change this program to use LJUD.STREAMWAITMODES.SLEEP mode.
LJUD.AddRequest(u3.ljhandle, LJUD.IO.PUT_CONFIG, LJUD.CHANNEL.STREAM_WAIT_MODE, (double)LJUD.STREAMWAITMODES.NONE, 0, 0);
//Define the scan list as AIN0 then AIN1.
LJUD.AddRequest(u3.ljhandle, LJUD.IO.CLEAR_STREAM_CHANNELS, 0, 0, 0, 0);
LJUD.AddRequest(u3.ljhandle, LJUD.IO.ADD_STREAM_CHANNEL, 0, 0, 0, 0);
LJUD.AddRequest(u3.ljhandle, LJUD.IO.ADD_STREAM_CHANNEL_DIFF, 1, 0, 32, 0);
//Execute the list of requests.
LJUD.GoOne(u3.ljhandle);
}
catch (LabJackUDException e)
{
showErrorMessage(e);
}
//Get all the results just to check for errors.
try { LJUD.GetFirstResult(u3.ljhandle, ref ioType, ref channel, ref dblValue, ref dummyInt, ref dummyDouble); }
catch (LabJackUDException e) { showErrorMessage(e); }
bool finished = false;
while (!finished)
{
try { LJUD.GetNextResult(u3.ljhandle, ref ioType, ref channel, ref dblValue, ref dummyInt, ref dummyDouble); }
catch (LabJackUDException e)
{
// If we get an error, report it. If the error is NO_MORE_DATA_AVAILABLE we are done
if (e.LJUDError == UE9.LJUDERROR.NO_MORE_DATA_AVAILABLE)
{
finished = true;
}
else
{
showErrorMessage(e);
}
}
}
//Start the stream.
try
{
LJUD.eGet(u3.ljhandle, LJUD.IO.START_STREAM, 0, ref dblValue, 0);
}
catch (LabJackUDException e) { showErrorMessage(e); }
//The actual scan rate is dependent on how the desired scan rate divides into
//the LabJack clock. The actual scan rate is returned in the value parameter
//from the start stream command.
Console.Out.WriteLine("Actual Scan Rate = {0:0.000}\n", dblValue);
Console.Out.WriteLine("Actual Sample Rate = {0:0.000}\n", 2 * dblValue); // # channels * scan rate
//Read data
while (Win32Interop._kbhit() == 0) //Loop will run until any key is hit
{
//Since we are using wait mode LJUD.STREAMWAITMODES.NONE, we will wait a little, then
//read however much data is available. Thus this delay will control how
//fast the program loops and how much data is read each loop. An
//alternative common method is to use wait mode LJUD.STREAMWAITMODES.SLEEP where the
//stream read waits for a certain number of scans. In such a case
//you would not have a delay here, since the stream read will actually
//control how fast the program loops.
//
//To change this program to use sleep mode,
// -change numScans to the actual number of scans desired per read,
// -change wait mode addrequest value to LJUD.STREAMWAITMODES.SLEEP,
// -comment out the following Thread.Sleep command.
Thread.Sleep(delayms); //Remove if using LJUD.STREAMWAITMODES.SLEEP.
//init array so we can easily tell if it has changed
for (k = 0; k < numScans * 2; k++)
{
adblData[k] = 9999.0;
}
try
{
//Read the data. We will request twice the number we expect, to
//make sure we get everything that is available.
//Note that the array we pass must be sized to hold enough SAMPLES, and
//the Value we pass specifies the number of SCANS to read.
numScansRequested = numScans;
LJUD.eGet(u3.ljhandle, LJUD.IO.GET_STREAM_DATA, LJUD.CHANNEL.ALL_CHANNELS, ref numScansRequested, adblData);
//The displays the number of scans that were actually read.
Console.Out.WriteLine("\nIteration # {0:0.#}\n", i);
Console.Out.WriteLine("Number read = {0:0}\n", numScansRequested);
//This displays just the first scan.
Console.Out.WriteLine("First scan = {0:0.000}, {1:0.000}\n", adblData[0], adblData[1]);
//Retrieve the current backlog. The UD driver retrieves stream data from
//the U3 in the background, but if the computer is too slow for some reason
//the driver might not be able to read the data as fast as the U3 is
//acquiring it, and thus there will be data left over in the U3 buffer.
LJUD.eGet(u3.ljhandle, LJUD.IO.GET_CONFIG, LJUD.CHANNEL.STREAM_BACKLOG_COMM, ref dblCommBacklog, 0);
Console.Out.WriteLine("Comm Backlog = {0:0}\n", dblCommBacklog);
LJUD.eGet(u3.ljhandle, LJUD.IO.GET_CONFIG, LJUD.CHANNEL.STREAM_BACKLOG_UD, ref dblUDBacklog, 0);
Console.Out.WriteLine("UD Backlog = {0:0}\n", dblUDBacklog);
i++;
}
catch (LabJackUDException e) { showErrorMessage(e); }
}
//Stop the stream
try{ LJUD.eGet(u3.ljhandle, LJUD.IO.STOP_STREAM, 0, ref dummyDouble, dummyDoubleArray); }
catch (LabJackUDException e) { showErrorMessage(e); }
Console.Out.WriteLine("\nDone");
Console.ReadLine(); // Pause for user
}
public void performActions()
{
long i = 0, k = 0;
LJUD.IO ioType = 0;
LJUD.CHANNEL channel = 0;
double dblValue = 0, dblCommBacklog = 0, dblUDBacklog = 0;
double scanRate = 1000; //scan rate = sample rate / #channels
int delayms = 1000;
double numScans = 2000; //Max number of scans per read. 2x the expected # of scans (2*scanRate*delayms/1000).
double numScansRequested;
double[] adblData = new double[4000]; //Max buffer size (#channels*numScansRequested)
// Dummy variables to satisfy certain method signatures
double dummyDouble = 0;
double[] dummyDoubleArray = { 0 };
int dummyInt = 0;
// Open U6
try
{
u6 = new U6(LJUD.CONNECTION.USB, "0", true); // Connection through USB
}
catch (LabJackUDException e)
{
showErrorMessage(e);
}
try
{
//Configure the stream:
//Configure the resolution of the analog inputs (pass a non-zero value for quick sampling).
//See section 2.6 / 3.1 for more information.
LJUD.AddRequest(u6.ljhandle, LJUD.IO.PUT_CONFIG, LJUD.CHANNEL.AIN_RESOLUTION, 0, 0, 0);
//Configure the analog input range on channel 0 for bipolar +-10 volts.
LJUD.AddRequest(u6.ljhandle, LJUD.IO.PUT_AIN_RANGE, 0, (double)LJUD.RANGES.BIP10V, 0, 0);
//Set the scan rate.
LJUD.AddRequest(u6.ljhandle, LJUD.IO.PUT_CONFIG, LJUD.CHANNEL.STREAM_SCAN_FREQUENCY, scanRate, 0, 0);
//Give the driver a 5 second buffer (scanRate * 2 channels * 5 seconds).
LJUD.AddRequest(u6.ljhandle, LJUD.IO.PUT_CONFIG, LJUD.CHANNEL.STREAM_BUFFER_SIZE, scanRate * 2 * 5, 0, 0);
//Configure reads to retrieve whatever data is available without waiting (wait mode LJUD.STREAMWAITMODES.NONE).
//See comments below to change this program to use LJUD.STREAMWAITMODES.SLEEP mode.
LJUD.AddRequest(u6.ljhandle, LJUD.IO.PUT_CONFIG, LJUD.CHANNEL.STREAM_WAIT_MODE, (double)LJUD.STREAMWAITMODES.NONE, 0, 0);
//Define the scan list as AIN0 then AIN1.
LJUD.AddRequest(u6.ljhandle, LJUD.IO.CLEAR_STREAM_CHANNELS, 0, 0, 0, 0);
LJUD.AddRequest(u6.ljhandle, LJUD.IO.ADD_STREAM_CHANNEL, 0, 0, 0, 0);
LJUD.AddRequest(u6.ljhandle, LJUD.IO.ADD_STREAM_CHANNEL, 1, 0, 0, 0);
//Execute the list of requests.
LJUD.GoOne(u6.ljhandle);
}
catch (LabJackUDException e)
{
showErrorMessage(e);
}
// Get results until there is no more data available for error checking
bool isFinished = false;
while (!isFinished)
{
try { LJUD.GetNextResult(u6.ljhandle, ref ioType, ref channel, ref dummyDouble, ref dummyInt, ref dummyDouble); }
catch (LabJackUDException e)
{
// If we get an error, report it. If the error is NO_MORE_DATA_AVAILABLE we are done
if (e.LJUDError == U6.LJUDERROR.NO_MORE_DATA_AVAILABLE)
{
isFinished = true;
}
else
{
showErrorMessage(e);
}
}
}
//Start the stream.
LJUD.eGet(u6.ljhandle, LJUD.IO.START_STREAM, 0, ref dblValue, 0);
//The actual scan rate is dependent on how the desired scan rate divides into
//the LabJack clock. The actual scan rate is returned in the value parameter
//from the start stream command.
Console.Out.WriteLine("Actual Scan Rate = {0:0.###}\n", dblValue);
Console.Out.WriteLine("Actual Sample Rate = {0:0.###}\n", 2 * dblValue);
//Read data
while (Win32Interop._kbhit() == 0) //Loop will run until any key is hit
{
//Since we are using wait mode LJUD.STREAMWAITMODES.NONE, we will wait a little, then
//read however much data is available. Thus this delay will control how
//fast the program loops and how much data is read each loop. An
//alternative common method is to use wait mode LJUD.STREAMWAITMODES.SLEEP where the
//stream read waits for a certain number of scans. In such a case
//you would not have a delay here, since the stream read will actually
//control how fast the program loops.
//
//To change this program to use sleep mode,
// -change numScans to the actual number of scans desired per read,
// -change wait mode addrequest value to LJUD.STREAMWAITMODES.SLEEP,
// -comment out the following Thread.Sleep command.
Thread.Sleep(delayms); //Remove if using LJUD.STREAMWAITMODES.SLEEP.
//init array so we can easily tell if it has changed
for (k = 0; k < numScans * 2; k++)
{
adblData[k] = 9999.0;
}
//Read the data. We will request twice the number we expect, to
//make sure we get everything that is available.
//Note that the array we pass must be sized to hold enough SAMPLES, and
//the Value we pass specifies the number of SCANS to read.
numScansRequested = numScans;
LJUD.eGet(u6.ljhandle, LJUD.IO.GET_STREAM_DATA, LJUD.CHANNEL.ALL_CHANNELS, ref numScansRequested, adblData);
//The displays the number of scans that were actually read.
Console.Out.WriteLine("\nIteration # {0:0}\n", i);
Console.Out.WriteLine("Number scans read = {0:0}\n", numScansRequested);
//Display just the first scan.
Console.Out.WriteLine("First scan = {0:0.###}, {1:0.###}\n", adblData[0], adblData[1]);
//Retrieve the current Comm backlog. The UD driver retrieves stream data from
//the U6 in the background, but if the computer is too slow for some reason
//the driver might not be able to read the data as fast as the U6 is
//acquiring it, and thus there will be data left over in the U6 buffer.
LJUD.eGet(u6.ljhandle, LJUD.IO.GET_CONFIG, LJUD.CHANNEL.STREAM_BACKLOG_COMM, ref dblCommBacklog, 0);
Console.Out.WriteLine("Comm Backlog = {0:0.###}\n", dblCommBacklog);
//Retrieve the current UD driver backlog. If this is growing, then the application
//software is not pulling data from the UD driver fast enough.
LJUD.eGet(u6.ljhandle, LJUD.IO.GET_CONFIG, LJUD.CHANNEL.STREAM_BACKLOG_UD, ref dblUDBacklog, 0);
Console.Out.WriteLine("UD Backlog = {0:0.###}\n", dblUDBacklog);
i++;
}
//Stop the stream
LJUD.eGet(u6.ljhandle, LJUD.IO.STOP_STREAM, 0, ref dummyDouble, dummyDoubleArray);
Console.Out.WriteLine("\nDone");
Console.ReadLine(); // Pause for user
}