Re: [Discuss-gnuradio] Problem in using connect(gr.file_source, usrp.sink_s)

[Eng. Firas]

Hello Hook,

Make File source repeat =True as follows :

self.dst = gr.file_source(gr.sizeof_short, 'output.dat',True)


Firas


Eliane Hook wrote:
> 
> Hi,
> 
> I am a newbie with GNURADIO and USRP. I am trying to capture data that
> comes
> thru the USB cable from the USRP board and transmit it back to the USRP
> board. I was reading thru the email archives and I came across this:
> 
> To log data from the USRP: usrp.source_c -> gr.file_sink(complex)
> To replay data to the USRP: gr.file_source(complex) -> usrp.sink_c
> 
> and some more information like use the usrp_rx_cfile.py to capture data
> from
> the USRP. I am facing a problem in implementing 'gr.file_source(complex)
> ->
> usrp.sink_c'.
> 
> output.dat in the code is the binary file that I got from running
> usrp_rx_cfile.py with option 's' and 'f'. I am using the usrp.source_s and
> usrp.sink_s instead of usrp.source_c and usrp.sink_c. The code
> implementing
> the above is:
> 
> ============================================================
> class my_graph(gr.flow_graph):
> 
>     def __init__(self):
>         gr.flow_graph.__init__(self)
> 
>         usage="%prog: [options] output_filename"
>         parser = OptionParser(option_class=eng_option, usage=usage)
>         parser.add_option("-R", "--tx-subdev-spec", type="subdev",
> default=(0, 0),
>                           help="select USRP Tx side A or B (default=A)")
>         parser.add_option("-i", "--interp", type="intx", default=16,
>                           help="set fgpa interpolation rate to INTERP
> [default=%default]")
>         parser.add_option("-f", "--freq", type="eng_float", default=None,
>                           help="set frequency to FREQ", metavar="FREQ")
>         parser.add_option("-g", "--gain", type="eng_float", default=None,
>                           help="set gain in dB (default is midpoint)")
>         (options, args) = parser.parse_args ()
> 
>         if options.freq is None:
>             parser.print_help()
>             sys.stderr.write('You must specify the frequency with -f
> FREQ\n');
>             raise SystemExit, 1
> 
>         # build the graph
>         self.u = usrp.sink_s(interp_rate=options.interp)
>         self.dst = gr.file_source(gr.sizeof_short, 'output.dat')
>         self.connect(self.dst, self.u)
> 
>         dac_rate= self.u.dac_rate();
> 
>         if options.tx_subdev_spec is None:
>             options.tx_subdev_spec = usrp.pick_tx_subdevice(self.u)
>         self.u.set_mux(usrp.determine_tx_mux_value(self.u,
> options.tx_subdev_spec))
> 
>         # determine the daughterboard subdevice we're using
>         self.subdev = usrp.selected_subdev(self.u, options.tx_subdev_spec)
>         print "Using TX d'board %s" % (self.subdev.side_and_name(),)
> 
>         if options.gain is None:
>             # if no gain was specified, use the mid-point in dB
>             g = self.subdev.gain_range()
>             options.gain = float(g[0]+g[1])/2
> 
>         self.subdev.set_gain(options.gain)
> 
>         r = self.u.tune(0, self.subdev, options.freq)
>         if not r:
>             sys.stderr.write('Failed to set frequency\n')
>             raise SystemExit, 1
> 
> 
> if __name__ == '__main__':
>     try:
>         my_graph().run()
>     except KeyboardInterrupt:
>         pass
> =================================================================================
> 
> and when I run it, I see the following:
> ../python/usrp# ./txIQ.py -f 2.4G
> Using TX d'board A: Flex 2400 Tx MIMO B
> ../python/usrp#
> ../python/usrp#
> 
> The script runs for a second or two and stops immediately.
> 
> The email archives are very useful but still I am not able to implement
> what
> I want. Looking for some help. I really appreciate any help and thanks for
> the email responses in the archive.
> -- Eliane
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
> 

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