// Read 978MHz from SDR. func sdrReader() { var err error var dev *rtl.Context log.Printf("===== UAT Device name: %s =====\n", rtl.GetDeviceName(uatSDR)) if dev, err = rtl.Open(uatSDR); err != nil { log.Printf("\tOpen Failed, exiting\n") uatSDR = -1 return } defer dev.Close() m, p, s, err := dev.GetUsbStrings() if err != nil { log.Printf("\tGetUsbStrings Failed - error: %s\n", err) } else { log.Printf("\tGetUsbStrings - %s %s %s\n", m, p, s) } log.Printf("\tGetTunerType: %s\n", dev.GetTunerType()) //---------- Set Tuner Gain ---------- tgain := 480 err = dev.SetTunerGainMode(true) if err != nil { log.Printf("\tSetTunerGainMode Failed - error: %s\n", err) } else { log.Printf("\tSetTunerGainMode Successful\n") } err = dev.SetTunerGain(tgain) if err != nil { log.Printf("\tSetTunerGain Failed - error: %s\n", err) } else { log.Printf("\tSetTunerGain Successful\n") } //---------- Get/Set Sample Rate ---------- samplerate := 2083334 err = dev.SetSampleRate(samplerate) if err != nil { log.Printf("\tSetSampleRate Failed - error: %s\n", err) } else { log.Printf("\tSetSampleRate - rate: %d\n", samplerate) } log.Printf("\tGetSampleRate: %d\n", dev.GetSampleRate()) //---------- Get/Set Xtal Freq ---------- rtlFreq, tunerFreq, err := dev.GetXtalFreq() if err != nil { log.Printf("\tGetXtalFreq Failed - error: %s\n", err) } else { log.Printf("\tGetXtalFreq - Rtl: %d, Tuner: %d\n", rtlFreq, tunerFreq) } newRTLFreq := 28800000 newTunerFreq := 28800000 err = dev.SetXtalFreq(newRTLFreq, newTunerFreq) if err != nil { log.Printf("\tSetXtalFreq Failed - error: %s\n", err) } else { log.Printf("\tSetXtalFreq - Center freq: %d, Tuner freq: %d\n", newRTLFreq, newTunerFreq) } //---------- Get/Set Center Freq ---------- err = dev.SetCenterFreq(978000000) if err != nil { log.Printf("\tSetCenterFreq 978MHz Failed, error: %s\n", err) } else { log.Printf("\tSetCenterFreq 978MHz Successful\n") } log.Printf("\tGetCenterFreq: %d\n", dev.GetCenterFreq()) //---------- Set Bandwidth ---------- bw := 1000000 log.Printf("\tSetting Bandwidth: %d\n", bw) if err = dev.SetTunerBw(bw); err != nil { log.Printf("\tSetTunerBw %d Failed, error: %s\n", bw, err) } else { log.Printf("\tSetTunerBw %d Successful\n", bw) } if err = dev.ResetBuffer(); err == nil { log.Printf("\tResetBuffer Successful\n") } else { log.Printf("\tResetBuffer Failed - error: %s\n", err) } //---------- Get/Set Freq Correction ---------- freqCorr := dev.GetFreqCorrection() log.Printf("\tGetFreqCorrection: %d\n", freqCorr) err = dev.SetFreqCorrection(globalSettings.PPM) if err != nil { log.Printf("\tSetFreqCorrection %d Failed, error: %s\n", globalSettings.PPM, err) } else { log.Printf("\tSetFreqCorrection %d Successful\n", globalSettings.PPM) } for uatSDR != -1 { var buffer = make([]uint8, rtl.DefaultBufLength) nRead, err := dev.ReadSync(buffer, rtl.DefaultBufLength) if err != nil { log.Printf("\tReadSync Failed - error: %s\n", err) uatSDR = -1 break } else { // log.Printf("\tReadSync %d\n", nRead) buf := buffer[:nRead] godump978.InChan <- buf } } }