private void frmDataDisplay_Load(object sender, EventArgs e)
{
MccDaq.TriggerType DefaultTrig;
InitUL();
// determine the number of analog channels and their capabilities
int ChannelType = clsAnalogIO.ANALOGINPUT;
NumAIChans = AIOProps.FindAnalogChansOfType(DaqBoard, ChannelType,
out ADResolution, out Range, out LowChan, out DefaultTrig);
if (NumAIChans == 0)
{
lblInstruction.Text = "Board " + DaqBoard.BoardNum.ToString() +
" does not have analog input channels.";
cmdStartConvert.Enabled = false;
txtHighChan.Enabled = false;
}
else if (ADResolution > 12)
{
lblInstruction.Text = "Board " + DaqBoard.BoardNum.ToString() +
" resolution is greater than 12-bits. This sample applies " +
"only to 12-bit devices that contain composite data.";
cmdStartConvert.Enabled = false;
txtHighChan.Enabled = false;
}
else
{
// set aside memory to hold 16-bit data
ADData = new ushort[NumPoints];
ConvData = new ushort[NumPoints];
MemHandle = MccDaq.MccService.WinBufAllocEx(NumPoints);
if (MemHandle == IntPtr.Zero)
{
cmdStartConvert.Enabled = false;
NumAIChans = 0;
}
if (NumAIChans > 5)
{
NumAIChans = 5;
}
MaxChan = LowChan + NumAIChans - 1;
lblInstruction.Text = "Board " + DaqBoard.BoardNum.ToString() +
" collecting analog data on up to " + NumAIChans.ToString() +
" channels using AInScan with Range set to " + Range.ToString() +
". For devices that store composite data, this sample separates " +
"channel tags from data manually. Most new designs do not support this.";
}
}
private void frmStatusDisplay_Load(object sender, EventArgs e)
{
MccDaq.TriggerType DefaultTrig;
InitUL();
// determine the number of analog channels and their capabilities
int ChannelType = clsAnalogIO.ANALOGINPUT;
NumAIChans = AIOProps.FindAnalogChansOfType(DaqBoard, ChannelType,
out ADResolution, out Range, out LowChan, out DefaultTrig);
if (NumAIChans == 0)
{
lblInstruction.Text = "Board " + DaqBoard.BoardNum.ToString() +
" does not have analog input channels.";
cmdStartBgnd.Enabled = false;
txtHighChan.Enabled = false;
}
else
{
// Check the resolution of the A/D data and allocate memory accordingly
if (ADResolution > 16)
{
// set aside memory to hold high resolution data
ADData32 = new uint[NumPoints];
MemHandle = MccDaq.MccService.WinBufAlloc32Ex(NumPoints);
}
else
{
// set aside memory to hold 16-bit data
ADData = new ushort[NumPoints];
MemHandle = MccDaq.MccService.WinBufAllocEx(NumPoints);
}
if (MemHandle == IntPtr.Zero)
{
cmdStartBgnd.Enabled = false;
NumAIChans = 0;
}
if (NumAIChans > 8)
{
NumAIChans = 8;
}
MaxChan = LowChan + NumAIChans - 1;
lblInstruction.Text = "Board " + DaqBoard.BoardNum.ToString() +
" collecting analog data on up to " + NumAIChans.ToString() +
" channels using AInScan with Range set to " + Range.ToString() + ".";
}
}
private void cmdStart_Click(object eventSender, System.EventArgs eventArgs)
{
string TrigSource;
MccDaq.ErrorInfo ULStat;
MccDaq.TriggerType TrigType;
float LSB, VoltageRange;
int FSCounts, Rate;
bool ValidChan;
cmdStart.Enabled = false;
// Select the trigger source using Mccdaq.MccBoard.SetTrigger()
// Parameters:
// TrigType :the type of triggering based on external trigger source
// LowThreshold :Low threshold when the trigger input is analog
// HighThreshold :High threshold when the trigger input is analog
float highVal = 1.53F;
float lowVal = 0.1F;
TrigType = MccDaq.TriggerType.TrigAbove;
TrigSource = "analog trigger input";
ushort HighThreshold = 0;
ushort LowThreshold = 0;
if (AIOProps.ATrigRes == 0)
{
ULStat = DaqBoard.FromEngUnits(Range, highVal, out HighThreshold);
ULStat = DaqBoard.FromEngUnits(Range, lowVal, out LowThreshold);
}
else
{
//Use the value acquired from the AnalogIO module, since the resolution
//of the input is different from the resolution of the trigger.
//Calculate trigger based on resolution returned and trigger range.
VoltageRange = AIOProps.ATrigRange;
if (AIOProps.ATrigRange == -1)
{
VoltageRange = AIOProps.GetRangeVolts(Range);
TrigSource = "first channel in scan";
}
FSCounts = (int)Math.Pow(2, AIOProps.ATrigRes);
LSB = VoltageRange / FSCounts;
LowThreshold = (ushort)((lowVal / LSB) + (FSCounts / 2));
HighThreshold = (ushort)((highVal / LSB) + (FSCounts / 2));
}
lblInstruction.Text = "Board " + DaqBoard.BoardNum.ToString() +
" collecting analog data on up to " + NumAIChans.ToString() +
" channels using AInScan with Range set to " + Range.ToString() + ".";
lblResult.Text = "Waiting for a trigger at " + TrigSource + ". " +
"Trigger criterea: signal rising above " + highVal.ToString("0.00") +
"V. (Ctl-Break to abort.)";
Application.DoEvents();
ULStat = DaqBoard.SetTrigger(TrigType, LowThreshold, HighThreshold);
if (ULStat.Value == MccDaq.ErrorInfo.ErrorCode.NoErrors)
{
// Collect the values with MccDaq.MccBoard.AInScan()
// Parameters:
// LowChan :the first channel of the scan
// HighChan :the last channel of the scan
// Count :the total number of A/D samples to collect
// Rate :sample rate
// Range :the range for the board
// MemHandle :Handle for Windows buffer to store data in
// Options :data collection options
ValidChan = int.TryParse(txtHighChan.Text, out HighChan);
if (ValidChan)
{
if ((HighChan > MaxChan))
{
HighChan = MaxChan;
}
txtHighChan.Text = HighChan.ToString();
}
int Count = NumPoints; // total number of data points to collect
// per channel sampling rate ((samples per second) per channel)
Rate = 1000 / ((HighChan - LowChan) + 1);
MccDaq.ScanOptions Options = MccDaq.ScanOptions.ConvertData // return data as 12-bit values
| MccDaq.ScanOptions.ExtTrigger;
ULStat = DaqBoard.AInScan(LowChan, HighChan, Count, ref Rate, Range, MemHandle, Options);
lblResult.Text = "";
if (ULStat.Value == ErrorInfo.ErrorCode.Interrupted)
{
lblInstruction.Text = "Scan interrupted while waiting " +
"for trigger on board " + DaqBoard.BoardNum.ToString() +
". Click Start to try again.";
cmdStart.Enabled = true;
return;
}
else if (!(ULStat.Value == ErrorInfo.ErrorCode.NoErrors))
{
lblInstruction.Text = "Error occurred on board " +
DaqBoard.BoardNum.ToString() +
": " + ULStat.Message;
cmdStart.Enabled = false;
return;
}
// Transfer the data from the memory buffer set up by Windows to an array
if (ADResolution > 16)
{
ULStat = MccDaq.MccService.WinBufToArray32(MemHandle, ADData32, FirstPoint, Count);
for (int i = 0; i <= HighChan; ++i)
{
lblADData[i].Text = ADData32[i].ToString("0");
}
}
else
{
ULStat = MccDaq.MccService.WinBufToArray(MemHandle, ADData, FirstPoint, Count);
for (int i = 0; i <= HighChan; ++i)
{
lblADData[i].Text = ADData[i].ToString("0");
}
}
for (int j = HighChan + 1; j <= 7; ++j)
{
lblADData[j].Text = "";
}
}
cmdStart.Enabled = true;
}