public unsafe static extern SDRplayIO.mir_sdr_ErrT mir_sdr_DownConvert(short *xin, short *xi, short *xq, uint SamplesPerPacket, SDRplayIO.mir_sdr_If_kHzT ifType, uint Decimation, uint Preset);
public static extern SDRplayIO.mir_sdr_ErrT mir_sdr_Init(int gRdB, double fsMHz, double rfMHz, SDRplayIO.mir_sdr_Bw_MHzT bwType, SDRplayIO.mir_sdr_If_kHzT ifType, out int samplesPerPacket);
public unsafe void SDRplay_Initalisation()
{
int DownSampleFactor;
bool DownconversionEnabledTS;
SDRplayIO.mir_sdr_ErrT res;
Running = true;
res = NativeMethods.mir_sdr_Init(GainReduction, (SampleRateTable[SampleRateIndex] / 1e3), NominalFrequency, Bandwidth, IFFrequency, out NoUsbSamplesReturned);
if (res == SDRplayIO.mir_sdr_ErrT.mir_sdr_Success)
{
NativeMethods.mir_sdr_SetDcMode(1, 0);
NativeMethods.mir_sdr_SetGrParams(0, LNAGRThresh);
NativeMethods.mir_sdr_SetGr(GainReduction, 1, 0);
NativeMethods.mir_sdr_ResetUpdateFlags(1, 1, 1);
if (IBuffer != null)
{
IBuffer.Dispose();
}
if (QBuffer != null)
{
QBuffer.Dispose();
}
if (IQBuffer != null)
{
IQBuffer.Dispose();
}
if (IBufferDecimation != null)
{
IBufferDecimation.Dispose();
}
if (QBufferDecimation != null)
{
QBufferDecimation.Dispose();
}
//Adjust Buffer size depending on downsampled or not.
DownSampleFactor = SampleRateIndex;
DownconversionEnabledTS = DownconversionEnabled;
if (IFFrequency == SDRplayIO.mir_sdr_If_kHzT.mir_sdr_IF_Zero)
{
if (DownSampleTable[DownSampleFactor] != 0)
{
NumberOfSamples = NoUsbSamplesReturned / DownSampleTable[DownSampleFactor];
}
else
{
NumberOfSamples = NoUsbSamplesReturned;
}
}
else
{
if ((((SampleRateIndex == 15) && (Bandwidth == SDRplayIO.mir_sdr_Bw_MHzT.mir_sdr_BW_1_536) && (IFFrequency == SDRplayIO.mir_sdr_If_kHzT.mir_sdr_IF_2_048)) ||
((SampleRateIndex == 8) && (Bandwidth == SDRplayIO.mir_sdr_Bw_MHzT.mir_sdr_BW_0_200) && (IFFrequency == SDRplayIO.mir_sdr_If_kHzT.mir_sdr_IF_0_450)) ||
((SampleRateIndex == 8) && (Bandwidth == SDRplayIO.mir_sdr_Bw_MHzT.mir_sdr_BW_0_300) && (IFFrequency == SDRplayIO.mir_sdr_If_kHzT.mir_sdr_IF_0_450))) && DownconversionEnabledTS)
{
Decimation = 4;
IFTypeDecimation = IFFrequency;
NumberOfSamples = (NoUsbSamplesReturned >> 2);
IBufferDecimation = UnsafeBuffer.Create(NumberOfSamples, sizeof(short));
QBufferDecimation = UnsafeBuffer.Create(NumberOfSamples, sizeof(short));
IDecimation = (short *)IBufferDecimation;
QDecimation = (short *)QBufferDecimation;
}
if (((SampleRateIndex == 8) && (Bandwidth == SDRplayIO.mir_sdr_Bw_MHzT.mir_sdr_BW_0_600) && (IFFrequency == SDRplayIO.mir_sdr_If_kHzT.mir_sdr_IF_0_450)) && DownconversionEnabledTS)
{
Decimation = 2;
IFTypeDecimation = IFFrequency;
NumberOfSamples = (NoUsbSamplesReturned >> 1);
IBufferDecimation = UnsafeBuffer.Create(NumberOfSamples, sizeof(short));
QBufferDecimation = UnsafeBuffer.Create(NumberOfSamples, sizeof(short));
IDecimation = (short *)IBufferDecimation;
QDecimation = (short *)QBufferDecimation;
}
}
// Allocate Buffers
IBuffer = UnsafeBuffer.Create(NoUsbSamplesReturned, sizeof(short));
QBuffer = UnsafeBuffer.Create(NoUsbSamplesReturned, sizeof(short));
IQBuffer = UnsafeBuffer.Create(NumberOfSamples, sizeof(Complex));
}
else
{
MessageBox.Show("mir_sdr_Init error code: " + res);
Stop();
return;
}
_ReaderThread = new Thread(() => ReaderThread(DownSampleFactor, DownconversionEnabledTS)); //, DecimationThreadsafe, DownconversionEnabledTS)
_ReaderThread.Name = "SDRplay Rx Thread";
_ReaderThread.Priority = ThreadPriority.Highest;
_ReaderThread.Start();
}
