Thanks for the reply Eric, here is what I have now:
#!/usr/bin/env python
from gnuradio import gr, gru, window
from gnuradio import usrp
from gnuradio.wxgui import stdgui, fftsink, scopesink
import wx
class topBlock(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
fftsize = 256
udecim = 256
mywin = window.blackmanharris(fftsize)
fft = gr.fft_vcc(fftsize, True, mywin)
signal = usrp.source_c(0,udecim) # signal from Basic RX,
decimation=256
ss2v = gr.stream_to_vector(gr.sizeof_gr_complex, fftsize)
v2ss = gr.vector_to_stream(gr.sizeof_gr_complex, fftsize)
f_sink = gr.file_sink(gr.sizeof_gr_complex,"output.dat")
self.connect(signal, ss2v, fft, v2ss, f_sink)
# Do stuff with fsink.data()
def main():
print "Initilizing.."
tb = topBlock()
print "Flowgraph start.."
tb.start()
print "Exiting.."
if __name__ == "__main__":
main()
But the output.dat file is empty. What I want to do here is to calculate the
fft of a bunch of samples and from there to extract the bin with the maximum
value in order to be able later to "follow" that signal in a aprox 200 Hz
bandwidth
Adrian
You need to insert a gr.stream_to_vector block between the usrp and
the fft. Also, using vector_sink_c is not recommended for anything
but QA code that runs with a small number of samples. If used like
you are trying to use it, it will consume all of the memory on your
system. Use a gr.file_sink instead.
Eric
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