public void Configure(float sampleRate, int bufferSize)
{
//Complain if too low
if (sampleRate < BAUD_RATE)
{
throw new Exception($"The sample rate specified, {sampleRate}, is too low to be useful. Must be >= {BAUD_RATE}.");
}
//Create parts
fmDemod = new FmBasebandDemodulator();
fmDemod.Configure(bufferSize, sampleRate);
amDemod = new AmBasebandDemodulator();
osc = new Oscillator(sampleRate, -2400);
symbolsPerSample = BAUD_RATE / sampleRate;
//Make filter
var filterBuilder = new LowPassFilterBuilder(sampleRate, 2080)
.SetAutomaticTapCount(200)
.SetWindow();
filter = RealFirFilter.CreateFirFilter(filterBuilder);
//Create buffer
buffer?.Dispose();
buffer = UnsafeBuffer.Create(bufferSize, out bufferPtr);
}
private void Form1_Load(object sender, EventArgs e)
{
//Add all entries to the pie graph to start off with
for (int i = 0; i < 32; i++)
{
rdsGroupChart.Series["Groups"].Points.AddXY("", 0);
rdsGroupChart.Series["Groups"].Points[i].IsVisibleInLegend = false;
}
//Configure table
rdsHistory.Columns.Add(GenerateColumn("PI", 40));
rdsHistory.Columns.Add(GenerateColumn("Group", 50));
rdsHistory.Columns.Add(GenerateColumn("Description", -1));
//Create buffers
iqBuffer = UnsafeBuffer.Create(BUFFER_SIZE, out iqBufferPtr);
audioBuffer = UnsafeBuffer.Create(BUFFER_SIZE, out audioBufferPtr);
//Open USB device
usb = new LibUSBProvider();
device = AirSpyDevice.OpenDevice(usb);
//Configure radio
device.SetLinearGain(gain.Value / 100f);
device.CenterFrequency = (long)(freq.Value * 1000000);
device.SampleRate = 3000000;
device.StartRx();
//Create filter
var filterBuilder = new LowPassFilterBuilder(device.SampleRate, BANDWIDTH / 2)
.SetAutomaticTapCount(BANDWIDTH * 0.1f, 50)
.SetWindow();
filter = ComplexFirFilter.CreateFirFilter(filterBuilder, filterBuilder.GetDecimation(out float decimatedSampleRate));
//Create FM and RDS
fm = new WbFmDemodulator();
fm.Configure(BUFFER_SIZE, decimatedSampleRate, 48000);
fm.OnStereoDetected += Fm_OnStereoDetected;
fm.OnRdsDetected += Fm_OnRdsDetected;
rds = new RdsClient();
fm.OnRdsFrameEmitted += (ulong frame) => rds.ProcessFrame(frame);
//Bind RDS client commands
rds.ProgramService.OnPartialTextReceived += ProgramService_OnPartialTextReceived;
rds.PiCode.OnPiCodeChanged += PiCode_OnPiCodeChanged;
rds.ProgramType.OnCategoryChanged += ProgramType_OnCategoryChanged;
rds.RadioText.OnPartialTextReceived += RadioText_OnPartialTextReceived;
rds.OnCommand += Rds_OnCommand;
//Create worker thread
worker = new Thread(WorkerThread);
worker.IsBackground = true;
worker.Start();
}
