4 Read samples 2 from two linked synchronised USRP's and write to file formatted as binary
5 single-precision complex values.
6 Make sure you read README on how to link the two usrps
10 from gnuradio import gr, eng_notation
11 from gnuradio import audio
12 from gnuradio import usrp
13 from gnuradio.eng_option import eng_option
14 from optparse import OptionParser
18 from gnuradio import usrp_multi
20 class my_graph(gr.flow_graph):
23 gr.flow_graph.__init__(self)
25 usage="%prog: [options] output_filename"
26 parser = OptionParser(option_class=eng_option, usage=usage)
27 parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=(0, 0),
28 help="select USRP Rx side A or B (default=A)")
29 parser.add_option("-d", "--decim", type="int", default=128,
30 help="set selfpa decimation rate to DECIM [default=%default]")
31 parser.add_option("-f", "--freq", type="eng_float", default=0.0,
32 help="set frequency to FREQ", metavar="FREQ")
33 parser.add_option("-g", "--gain", type="eng_float", default=None,
34 help="set gain in dB (default is midpoint)")
35 parser.add_option("-n", "--nchan", type="intx", default=2,
36 help="set nchannels to NCHAN")
37 parser.add_option("-N", "--nsamples", type="eng_float", default=None,
38 help="number of samples to collect [default=+inf]")
39 parser.add_option ("-o", "--output-file-m", default="usrp_rx_m.dat",
40 help="write master data to FILE", metavar="FILE")
41 parser.add_option ("--output-file-m2", default="usrp_rx_m2.dat",
42 help="write master data from second channel to FILE", metavar="FILE")
43 parser.add_option ("-p", "--output-file-s", default="usrp_rx_s.dat",
44 help="write slave data to FILE", metavar="FILE")
45 parser.add_option ("--output-file-s2", default="usrp_rx_s2.dat",
46 help="write slave data from second channel to FILE", metavar="FILE")
47 parser.add_option("-x", "--master-serialno", type="string", default=None,
48 help="Serial_no of the usrp which should be the MASTER (default= select any)")
49 (options, args) = parser.parse_args ()
54 if options.freq is None:
56 sys.stderr.write('You must specify the frequency with -f FREQ\n');
60 self.multi=usrp_multi.multi_source_align( fg=self, master_serialno=options.master_serialno, decim=options.decim,
62 self.um=self.multi.get_master_usrp()
63 self.us=self.multi.get_slave_usrp()
65 dst_m=gr.file_sink (gr.sizeof_gr_complex, options.output_file_m)
66 dst_s=gr.file_sink (gr.sizeof_gr_complex, options.output_file_s)
67 if options.nsamples is None:
68 self.connect((self.multi.get_master_source_c(),1),dst_m)
69 self.connect((self.multi.get_slave_source_c(),1),dst_s)
71 head_m = gr.head(gr.sizeof_gr_complex, int(options.nsamples))
72 head_s = gr.head(gr.sizeof_gr_complex, int(options.nsamples))
73 self.connect((self.multi.get_master_source_c(),1),head_m,dst_m)
74 self.connect((self.multi.get_slave_source_c(),1),head_s,dst_s)
77 dst_m2=gr.file_sink (gr.sizeof_gr_complex, options.output_file_m2)
78 dst_s2=gr.file_sink (gr.sizeof_gr_complex, options.output_file_s2)
79 if options.nsamples is None:
80 self.connect((self.multi.get_master_source_c(),2),dst_m2)
81 self.connect((self.multi.get_slave_source_c(),2),dst_s2)
83 head_m2 = gr.head(gr.sizeof_gr_complex, int(options.nsamples))
84 head_s2 = gr.head(gr.sizeof_gr_complex, int(options.nsamples))
85 self.connect((self.multi.get_master_source_c(),2),head_m2,dst_m2)
86 self.connect((self.multi.get_slave_source_c(),2),head_s2,dst_s2)
88 if options.rx_subdev_spec is None:
89 options.rx_subdev_spec = usrp.pick_rx_subdevice(self.um)
91 if (options.nchan!=4):
92 mux=usrp.determine_rx_mux_value(self.um, options.rx_subdev_spec)
93 mux= (mux<<8 & 0xffffffff) | (mux & 0xff)
97 # determine the daughterboard subdevice we're using
98 self.subdevm = usrp.selected_subdev(self.um, options.rx_subdev_spec)
99 self.subdevs = usrp.selected_subdev(self.us, options.rx_subdev_spec)
100 print "Using MASTER RX d'board %s" % (self.subdevm.side_and_name(),)
101 print "Using SLAVE RX d'board %s" % (self.subdevs.side_and_name(),)
102 input_rate = self.um.adc_freq() / self.um.decim_rate()
103 print "USB sample rate %s" % (eng_notation.num_to_str(input_rate))
105 if options.gain is None:
106 # if no gain was specified, use the mid-point in dB
107 g = self.subdevm.gain_range()
108 options.gain = float(g[0]+g[1])/2
110 self.multi.set_gain_all_rx(options.gain)
111 result,r1,r2,r3,r4 = self.multi.tune_all_rx(options.freq)
113 sys.stderr.write('Failed to set frequency\n')
116 def sync_usrps(self):
120 if __name__ == '__main__':
125 raw_input ('Press Enter to quit: ')
130 #except KeyboardInterrupt: