// 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
}
}
}
