3 from gnuradio import gr, gru
4 from gnuradio import usrp
5 from gnuradio.eng_option import eng_option
6 from gnuradio import eng_notation
7 from optparse import OptionParser
11 class my_graph(gr.hier_block2):
12 def __init__ (self, type, ampl, wfreq, offset, subdev_spec, interp, rf_freq):
13 # Call hierarchical block constructor
14 # Top-level blocks have no inputs or outputs
15 gr.hier_block2.__init__(self,
16 "usrp_siggen", # Block type
17 gr.io_signature(0,0,0), # Input signature
18 gr.io_signature(0,0,0)) # Output signature
22 self.waveform_type = type
23 self.waveform_ampl = ampl
24 self.waveform_freq = wfreq
25 self.waveform_offset = offset
27 self.u = usrp.sink_c (0, self.interp)
29 # determine the daughterboard subdevice we're using
30 if subdev_spec is None:
31 ubdev_spec = usrp.pick_tx_subdevice(self.u)
32 m = usrp.determine_tx_mux_value(self.u, subdev_spec)
34 self.subdev = usrp.selected_subdev(self.u, subdev_spec)
35 self.subdev.set_gain(self.subdev.gain_range()[1]) # set max Tx gain
36 self.subdev.set_enable(True) # enable transmitter
37 print "Using TX d'board %s" % (self.subdev.side_and_name(),)
39 if not self.set_freq(rf_freq):
40 sys.stderr.write('Failed to set RF frequency\n')
43 self.define_component("usrp", self.u)
45 if type == gr.GR_SIN_WAVE or type == gr.GR_CONST_WAVE:
46 self.src = gr.sig_source_c (self.usb_freq (),
51 self.define_component("src", self.src)
53 elif type == gr.GR_UNIFORM or type == gr.GR_GAUSSIAN:
54 self.src = gr.noise_source_c (gr.GR_UNIFORM,
56 self.define_component("src", self.src)
59 raise ValueError, type
61 # self.file_sink = gr.file_sink (gr.sizeof_gr_complex, "siggen.dat")
62 # self.define_component("file_sink", self.file_sink)
64 self.connect ("src", 0, "usrp", 0)
68 return self.u.dac_freq() / self.interp
70 def usb_throughput (self):
71 return self.usb_freq () * 4
73 def set_freq(self, target_freq):
75 Set the center frequency we're interested in.
77 @param target_freq: frequency in Hz
80 Tuning is a two step process. First we ask the front-end to
81 tune as close to the desired frequency as it can. Then we use
82 the result of that operation and our target_frequency to
83 determine the value for the digital up converter.
85 r = self.u.tune(self.subdev._which, self.subdev, target_freq)
87 #print "r.baseband_freq =", eng_notation.num_to_str(r.baseband_freq)
88 #print "r.dxc_freq =", eng_notation.num_to_str(r.dxc_freq)
89 #print "r.residual_freq =", eng_notation.num_to_str(r.residual_freq)
90 #print "r.inverted =", r.inverted
98 parser = OptionParser (option_class=eng_option)
99 parser.add_option ("-T", "--tx-subdev-spec", type="subdev", default=(0, 0),
100 help="select USRP Tx side A or B")
101 parser.add_option ("-f", "--rf-freq", type="eng_float", default=None,
102 help="set RF center frequency to FREQ")
103 parser.add_option ("-i", "--interp", type="int", default=64,
104 help="set fgpa interpolation rate to INTERP [default=%default]")
106 parser.add_option ("--sine", dest="type", action="store_const", const=gr.GR_SIN_WAVE,
107 help="generate a complex sinusoid [default]", default=gr.GR_SIN_WAVE)
108 parser.add_option ("--const", dest="type", action="store_const", const=gr.GR_CONST_WAVE,
109 help="generate a constant output")
110 parser.add_option ("--gaussian", dest="type", action="store_const", const=gr.GR_GAUSSIAN,
111 help="generate Gaussian random output")
112 parser.add_option ("--uniform", dest="type", action="store_const", const=gr.GR_UNIFORM,
113 help="generate Uniform random output")
115 parser.add_option ("-w", "--waveform-freq", type="eng_float", default=100e3,
116 help="set waveform frequency to FREQ [default=%default]")
117 parser.add_option ("-a", "--amplitude", type="eng_float", default=16e3,
118 help="set waveform amplitude to AMPLITUDE [default=%default]", metavar="AMPL")
119 parser.add_option ("-o", "--offset", type="eng_float", default=0,
120 help="set waveform offset to OFFSET [default=%default]")
121 (options, args) = parser.parse_args ()
127 if options.rf_freq is None:
128 sys.stderr.write("usrp_siggen: must specify RF center frequency with -f RF_FREQ\n")
132 top_block = my_graph(options.type, options.amplitude, options.waveform_freq, options.offset,
133 options.tx_subdev_spec, options.interp, options.rf_freq)
135 runtime = gr.runtime(top_block)
140 except KeyboardInterrupt:
144 if __name__ == '__main__':