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rtlsdr_scan_cgo.go
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rtlsdr_scan_cgo.go
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// +build cgo
package main
import (
"log"
)
type RtlSdrScanner struct {
device *rtlsdr.Context
// dataBuff []uint8
// dataBuffLen int
dataLen int
dataCh chan *SourceIQ
err error
}
func NewRtlSdrScanner(dataLen int) *RtlSdrScanner {
scanner := &RtlSdrScanner{
// dataBuff: make([]uint8, dataLen),
dataLen: dataLen,
dataCh: make(chan *SourceIQ, 1),
}
deviceCount := rtlsdr.GetDeviceCount()
if deviceCount == 0 {
log.Fatalln("RTL device not found")
}
var err error
scanner.device, err = rtlsdr.Open(0)
if err != nil {
log.Fatalln("Fail opened device: " + err.Error())
}
err = scanner.device.SetTunerGainMode(true)
if err != nil {
log.Fatalf("Error getting tuner gains\n")
}
scanner.device.SetAgcMode(false)
scanner.device.SetFreqCorrection(0)
scanner.device.SetCenterFreq(1090000000)
scanner.device.SetSampleRate(2000000)
scanner.device.SetTunerGainMode(false)
scanner.device.ResetBuffer()
gains, err := scanner.device.GetTunerGains()
if err != nil {
panic(err)
}
log.Printf("Set gain: %d\n", gains[len(gains)-1])
scanner.device.SetTunerGain(gains[len(gains)-1])
go func() {
scanner.err = scanner.device.ReadAsync(scanner.readCb, nil, 12, dataLen)
}()
return scanner
}
func (s *RtlSdrScanner) readCb(data []byte) {
s.dataCh <- NewSourceIQ(data, len(data))
}
func (s *RtlSdrScanner) Start() error {
return s.device.ReadAsync(s.readCb, nil, 12, s.dataLen)
}
func (s *RtlSdrScanner) Close() {
s.device.Close()
}
func (s *RtlSdrScanner) GetSourceIQCh() <-chan *SourceIQ {
return s.dataCh
}
func (s *RtlSdrScanner) Error() error {
return s.err
}