A wrapper for the librtlsdr C libraries. Currently, this only works on Linux (I think). You need to download the librtlsdr libraries.
This code is heavily based off the
pyrtlsdr libary by github user roger-.
Julia needs to find librtlsdr.so somewhere on your system.
To see if Julia can find it, you can use find_library:
using Libdl
find_library("librtlsdr") # returns empty string if library not foundYou can also type the following into an Ubuntu shell to help find it:
ldconfig -p | grep librtlsdrusing RTLSDR
r = RtlSdr()
set_rate(r, 2.0e6)
set_freq(r, 88.5e6) # if we wanted the center freq on NPR
samples = read_samples(r, 1024)
# plot power spectral density
using PyPlot
psd(samples)r = RtlSdr() # creates RtlSdr object with dongle pointer
set_rate(r, rate_Hz) # rtlsdr_set_sample_rate
get_rate(r)
set_freq(r, freq_Hz) # rtlsdr_set_center_freq
get_freq(r)
set_agc_mode(r, mode) # rtlsdr_set_agc_mode
set_tuner_gain_mode(r, manual) # rtlsdr_set_tuner_gain_mode
close(r) # rtlsdr_close. cannot read from r once this is called
# rtlsdr_read_sync
# returns vector of length num_bytes with Uint8 (bytes)
# num_bytes must be multiple of 512
read_bytes(r, num_bytes)
# converts vector of Uint8 into a vector (half as long) of complex iq samples
packed_bytes_to_iq(bytes)
# equivalent to read_bytes + packed_bytes_to_iq
# returns a vector of length num_samples with complex samples
# num_samples must be multiple of 256
read_samples(r, num_samples)
