rtl

package
v0.0.0-...-e7c78c1 Latest Latest
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 Go to latest Published: Mar 25, 2022 License: BSD-3-Clause Imports: 7 Imported by: 1

Documentation

Overview

Package rtl provides bindings to the rtl-sdr library.

Index

Constants

This section is empty.

Variables

View Source 
var (
	ErrFailed           = errors.New("rtl: operation failed")
	ErrNoDevices        = errors.New("rtl: no devices")
	ErrNoMatchingDevice = errors.New("rtl: no matching device")
)

Possible errors.

Functions

func DeviceCount 

func DeviceCount() int

DeviceCount returns the number of rtl-sdr devices found.

func DeviceName 

func DeviceName(index int) string

DeviceName returns the name of a device by index

func DeviceUSBStrings 

func DeviceUSBStrings(index int) (manufacturer, productName, serialNumber string, err error)

DeviceUSBStrings returns the USB device strings.

func IndexBySerial 

func IndexBySerial(serial string) (int, error)

IndexBySerial returns device index by USB serial string descriptor.

Types

type AsyncCallback 

type AsyncCallback func(buf []byte) bool

AsyncCallback returns true to stop the async loop

type Device 

type Device struct {
	// contains filtered or unexported fields
}

func Open 

func Open(index int) (*Device, error)

Open opens an rtl-sdr device by index.

func (*Device) CenterFreq 

func (dev *Device) CenterFreq() (uint, error)

CenterFreq returns the actual frequency the device is tuned to in Hz.

func (*Device) Close 

func (dev *Device) Close() error

Close closes the device.

func (*Device) GetDirectSampling 

func (dev *Device) GetDirectSampling() (DirectSampling, error)

GetDirectSampling returns the state of the direct sampling mode.

func (*Device) GetOffsetTuning 

func (dev *Device) GetOffsetTuning() (bool, error)

GetOffsetTuning returns the state of the offset tuning mode

func (*Device) Read 

func (dev *Device) Read(buf []byte) (int, error)

Read performs a synchronous read from the device.

func (*Device) ReadAsync 

func (dev *Device) ReadAsync(nBuffers, bufferSize int, cb AsyncCallback) error

ReadAsyncUsingSync starts an asynchronous background read. The provided callback is called for all buffers read. This is similar to ReadAsyncUsingSync but this version relies on the built-in asynchronous reading in the librtlsdr library.

func (*Device) ReadAsyncUsingSync 

func (dev *Device) ReadAsyncUsingSync(nBuffers, bufferSize int, cb AsyncCallback) error

ReadAsyncUsingSync starts an asynchronous background read. The provided callback is called for all buffers read. This is similar to ReadAsync but this version starts a goroutine that uses the synchronous read of the librtlsdr library.

func (*Device) ResetBuffer 

func (dev *Device) ResetBuffer() error

ResetBuffer resets internal buffers.

func (*Device) SampleRate 

func (dev *Device) SampleRate() (int, error)

SampleRate returns the actual sample rate the device is configured to

func (*Device) SetAGCMode 

func (dev *Device) SetAGCMode(enabled bool) error

SetAGCMode enables or disables the internal digital AGC of the RTL2832.

func (*Device) SetBiasTee 

func (dev *Device) SetBiasTee(enabled bool) error

SetBiasTee enables or disables the bias tee on GPIO PIN 0.

func (*Device) SetCenterFreq 

func (dev *Device) SetCenterFreq(freqHz uint) error

SetCenterFreq tunes to to the provided center frequency in hz.

func (*Device) SetDirectSampling 

func (dev *Device) SetDirectSampling(ds DirectSampling) error

SetDirectSampling enables or disables the direct sampling mode. When enabled, the IF mode of the RTL2832 is activated, and rtlsdr_set_center_freq() will control the IF-frequency of the DDC, which can be used to tune from 0 to 28.8 MHz (xtal frequency of the RTL2832).

func (*Device) SetOffsetTuning 

func (dev *Device) SetOffsetTuning(enabled bool) error

SetOffsetTuning enables or disables offset tuning for zero-IF tuners, which allows to avoid problems caused by the DC offset of the ADCs and 1/f noise.

func (*Device) SetSampleRate 

func (dev *Device) SetSampleRate(rate uint) error

SetSampleRate selects the baseband filters according to the requested sample rate

func (*Device) SetTunerGain 

func (dev *Device) SetTunerGain(gain int) error

SetTunerGain sets the gain for the device. Manual gain mode must be enabled for this to work. Value is in tenths of dB and varies by tuner. For the E4000 tuner: -10, 15, 40, 65, 90, 115, 140, 165, 190, 215, 240, 290, 340, 420, 430, 450, 470, 490 Gain values are in tenths of dB, e.g. 115 means 11.5 dB. Should use TunerGains() to get the list of supported gains.

func (*Device) SetTunerGainMode 

func (dev *Device) SetTunerGainMode(manual bool) error

SetTunerGainMode sets the gain mode (automatic/manual) for the device. Manual gain mode must be enabled for the gain setter function to work.

func (*Device) SetTunerIfGain 

func (dev *Device) SetTunerIfGain(stage, gain int) error

SetTunerIfGain sets the intermediate frequency gain for the device. - stage: intermediate frequency gain stage number (1 to 6 for E4000) - gain: tenths of a dB, -30 means -3.0 dB

func (*Device) SetXtalFreq 

func (dev *Device) SetXtalFreq(rtlFreq, tunerFreq uint) error

SetXtalFreq sets the crystal oscillator frequencies used for the RTL2832 and the tuner IC.

Usually both ICs use the same clock. Changing the clock may make sense if you are applying an external clock to the tuner or to compensate the frequency (and samplerate) error caused by the original (cheap) crystal.

NOTE: Call this function only if you fully understand the implications.

rtl_freq is the frequency value used to clock the RTL2832 in Hz tuner_freq is the frequency value used to clock the tuner IC in Hz

func (*Device) TunerGain 

func (dev *Device) TunerGain() (int, error)

TunerGain returns the actual gain the device is configured to in tength of a dB (115 means 11.5 dB)

func (*Device) TunerGains 

func (dev *Device) TunerGains() ([]int, error)

TunerGains returns a list of gains supported by the tuner.

func (*Device) TunerType 

func (dev *Device) TunerType() TunerType

TunerType returns the type of the tuner device.

func (*Device) XtalFreq 

func (dev *Device) XtalFreq() (uint, uint, error)

XtalFreq returns the crystal oscillator frequencies used for the RTL2832 and the tuner IC.

Usually both ICs use the same clock.

Returns frequency value used to clock the RTL2832 in Hz and frequency value used to clock the tuner IC in Hz.

type DirectSampling 

type DirectSampling int
const (
	DirectSamplingOff  DirectSampling = 0
	DirectSamplingIADC DirectSampling = 1
	DirectSamplingQADC DirectSampling = 2
)

func (DirectSampling) String 

func (ds DirectSampling) String() string

type LibUSBError 

type LibUSBError int

LibUSBError is an error from libusb

func (LibUSBError) Error 

func (e LibUSBError) Error() string

type TunerType 

type TunerType int
const (
	TunerTypeUnknown TunerType = C.RTLSDR_TUNER_UNKNOWN
	TunerTypeE4000   TunerType = C.RTLSDR_TUNER_E4000
	TunerTypeFC0012  TunerType = C.RTLSDR_TUNER_FC0012
	TunerTypeFC0013  TunerType = C.RTLSDR_TUNER_FC0013
	TunerTypeFC2580  TunerType = C.RTLSDR_TUNER_FC2580
	TunerTypeR820T   TunerType = C.RTLSDR_TUNER_R820T
	TunerTypeR828D   TunerType = C.RTLSDR_TUNER_R828D
)

Known tuner types

func (TunerType) String 

func (tt TunerType) String() string

Source Files

View all Source files

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