//----------------------------------------------------------------------------
//
// Function : ConfigureBoard
//
// Description : Configure sample rate, input, and trigger settings
//
//----------------------------------------------------------------------------
static public unsafe bool ConfigureBoard(IntPtr boardHandle, IntPtr fftHandle, UInt32 recordLength_samples)
{
UInt32 retCode;
// TODO: Specify the sample rate (in samples per second),
// and appropriate sample rate identifier
samplesPerSec = 4000000000.0;
UInt32 sampleRateId = AlazarAPI.SAMPLE_RATE_4000MSPS;
// TODO: Select clock parameters as required.
retCode =
AlazarAPI.AlazarSetCaptureClock(
boardHandle,
AlazarAPI.INTERNAL_CLOCK,
sampleRateId,
AlazarAPI.CLOCK_EDGE_RISING,
0
);
if (retCode != AlazarAPI.ApiSuccess)
{
Console.WriteLine("Error: AlazarSetCaptureClock failed -- " +
AlazarAPI.AlazarErrorToText(retCode));
return(false);
}
// TODO: Select channel A input parameters as required
retCode =
AlazarAPI.AlazarInputControlEx(
boardHandle,
AlazarAPI.CHANNEL_A,
AlazarAPI.DC_COUPLING,
AlazarAPI.INPUT_RANGE_PM_400_MV,
AlazarAPI.IMPEDANCE_50_OHM
);
if (retCode != AlazarAPI.ApiSuccess)
{
Console.WriteLine("Error: AlazarInputControlEx failed -- " +
AlazarAPI.AlazarErrorToText(retCode));
return(false);
}
// TODO: Select channel B input parameters as required
retCode =
AlazarAPI.AlazarInputControlEx(
boardHandle,
AlazarAPI.CHANNEL_B,
AlazarAPI.DC_COUPLING,
AlazarAPI.INPUT_RANGE_PM_400_MV,
AlazarAPI.IMPEDANCE_50_OHM
);
if (retCode != AlazarAPI.ApiSuccess)
{
Console.WriteLine("Error: AlazarInputControlEx failed -- " +
AlazarAPI.AlazarErrorToText(retCode));
return(false);
}
// TODO: Select trigger inputs and levels as required
retCode =
AlazarAPI.AlazarSetTriggerOperation(
boardHandle,
AlazarAPI.TRIG_ENGINE_OP_J,
AlazarAPI.TRIG_ENGINE_J,
AlazarAPI.TRIG_CHAN_A,
AlazarAPI.TRIGGER_SLOPE_POSITIVE,
150,
AlazarAPI.TRIG_ENGINE_K,
AlazarAPI.TRIG_DISABLE,
AlazarAPI.TRIGGER_SLOPE_POSITIVE,
128
);
if (retCode != AlazarAPI.ApiSuccess)
{
Console.WriteLine("Error: AlazarSetTriggerOperation failed -- " +
AlazarAPI.AlazarErrorToText(retCode));
return(false);
}
// TODO: Select external trigger parameters as required
retCode =
AlazarAPI.AlazarSetExternalTrigger(
boardHandle,
AlazarAPI.DC_COUPLING,
AlazarAPI.ETR_TTL
);
if (retCode != AlazarAPI.ApiSuccess)
{
Console.WriteLine("Error: AlazarSetExternalTrigger failed -- " +
AlazarAPI.AlazarErrorToText(retCode));
return(false);
}
// TODO: Set trigger delay as required.
double triggerDelay_sec = 0;
UInt32 triggerDelay_samples = (UInt32)(triggerDelay_sec * samplesPerSec + 0.5);
retCode =
AlazarAPI.AlazarSetTriggerDelay(
boardHandle,
triggerDelay_samples
);
if (retCode != AlazarAPI.ApiSuccess)
{
Console.WriteLine("Error: AlazarSetTriggerDelay failed -- " +
AlazarAPI.AlazarErrorToText(retCode));
return(false);
}
// TODO: Set trigger timeout as required.
// NOTE:
// The board will wait for a for this amount of time for a trigger event.
// If a trigger event does not arrive, then the board will automatically
// trigger. Set the trigger timeout value to 0 to force the board to wait
// forever for a trigger event.
//
// IMPORTANT:
// The trigger timeout value should be set to zero after appropriate
// trigger parameters have been determined, otherwise the
// board may trigger if the timeout interval expires before a
// hardware trigger event arrives.
double triggerTimeout_sec = 0;
UInt32 triggerTimeout_clocks = (UInt32)(triggerTimeout_sec / 10E-6 + 0.5);
retCode =
AlazarAPI.AlazarSetTriggerTimeOut(
boardHandle,
triggerTimeout_clocks
);
if (retCode != AlazarAPI.ApiSuccess)
{
Console.WriteLine("Error: AlazarSetTriggerTimeOut failed -- " +
AlazarAPI.AlazarErrorToText(retCode));
return(false);
}
// TODO: Configure AUX I/O connector as required
retCode =
AlazarAPI.AlazarConfigureAuxIO(
boardHandle,
AlazarAPI.AUX_OUT_TRIGGER,
0
);
if (retCode != AlazarAPI.ApiSuccess)
{
Console.WriteLine("Error: AlazarConfigureAuxIO failed -- " +
AlazarAPI.AlazarErrorToText(retCode));
return(false);
}
// FFT Configuration
UInt32 dspModuleId;
UInt16 versionMajor;
UInt16 versionMinor;
UInt32 maxLength;
UInt32 reserved0;
UInt32 reserved1;
retCode = AlazarAPI.AlazarDSPGetInfo(
fftHandle,
&dspModuleId,
&versionMajor,
&versionMinor,
&maxLength,
&reserved0,
&reserved1
);
if ((AlazarAPI.DSP_MODULE_TYPE)dspModuleId != AlazarAPI.DSP_MODULE_TYPE.DSP_MODULE_FFT)
{
Console.WriteLine("Error: DSP module is not FFT");
return(false);
}
UInt32 fftLength_samples = 1;
while (fftLength_samples < recordLength_samples)
{
fftLength_samples *= 2;
}
// TODO: Select the window function type
AlazarAPI.DSP_WINDOW_ITEMS windowType = AlazarAPI.DSP_WINDOW_ITEMS.DSP_WINDOW_HANNING;
// Create and fill the window function
float[] window = new float[fftLength_samples];
fixed(float *pWindow = &window[0])
{
retCode = AlazarAPI.AlazarDSPGenerateWindowFunction(
(UInt32)windowType,
pWindow,
recordLength_samples,
fftLength_samples - recordLength_samples
);
if (retCode != AlazarAPI.ApiSuccess)
{
Console.WriteLine("Error: AlazarDSPGenerateWindowFunction failed -- " +
AlazarAPI.AlazarErrorToText(retCode));
return(false);
}
// Set the window function
retCode = AlazarAPI.AlazarFFTSetWindowFunction(
fftHandle,
fftLength_samples,
pWindow,
(float *)0
);
if (retCode != AlazarAPI.ApiSuccess)
{
Console.WriteLine("Error: AlazarFFTSetWindowFunction failed -- " +
AlazarAPI.AlazarErrorToText(retCode));
return(false);
}
}
// TODO: Select the background subtraction record
Int16[] backgroundSubtractionRecord = new Int16[recordLength_samples];
// Background subtraction
fixed(Int16 *pBackgroundSubtractionRecord = &backgroundSubtractionRecord[0])
{
retCode = AlazarAPI.AlazarFFTBackgroundSubtractionSetRecordS16(
fftHandle,
pBackgroundSubtractionRecord,
recordLength_samples
);
if (retCode != AlazarAPI.ApiSuccess)
{
Console.WriteLine("Error: AlazarFFTBackgroundSubtractionSetRecordS16 failed -- " +
AlazarAPI.AlazarErrorToText(retCode));
return(false);
}
}
retCode = AlazarAPI.AlazarFFTBackgroundSubtractionSetEnabled(
fftHandle,
true
);
if (retCode != AlazarAPI.ApiSuccess)
{
Console.WriteLine("Error: AlazarFFTBackgroundSubtractionSetEnabled failed -- " +
AlazarAPI.AlazarErrorToText(retCode));
return(false);
}
return(true);
}