diff options
Diffstat (limited to 'gnuradio-examples/python/hier/usrp/usrp_siggen.py')
| -rwxr-xr-x | gnuradio-examples/python/hier/usrp/usrp_siggen.py | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/gnuradio-examples/python/hier/usrp/usrp_siggen.py b/gnuradio-examples/python/hier/usrp/usrp_siggen.py new file mode 100755 index 0000000000..28f80a822a --- /dev/null +++ b/gnuradio-examples/python/hier/usrp/usrp_siggen.py @@ -0,0 +1,145 @@ +#!/usr/bin/env python + +from gnuradio import gr, gru +from gnuradio import usrp +from gnuradio.eng_option import eng_option +from gnuradio import eng_notation +from optparse import OptionParser +import sys + + +class my_graph(gr.hier_block2): + def __init__ (self, type, ampl, wfreq, offset, subdev_spec, interp, rf_freq): + # Call hierarchical block constructor + # Top-level blocks have no inputs or outputs + gr.hier_block2.__init__(self, + "usrp_siggen", # Block type + gr.io_signature(0,0,0), # Input signature + gr.io_signature(0,0,0)) # Output signature + + # controllable values + self.interp = interp + self.waveform_type = type + self.waveform_ampl = ampl + self.waveform_freq = wfreq + self.waveform_offset = offset + + self.u = usrp.sink_c (0, self.interp) + + # determine the daughterboard subdevice we're using + if subdev_spec is None: + ubdev_spec = usrp.pick_tx_subdevice(self.u) + m = usrp.determine_tx_mux_value(self.u, subdev_spec) + self.u.set_mux(m) + self.subdev = usrp.selected_subdev(self.u, subdev_spec) + self.subdev.set_gain(self.subdev.gain_range()[1]) # set max Tx gain + self.subdev.set_enable(True) # enable transmitter + print "Using TX d'board %s" % (self.subdev.side_and_name(),) + + if not self.set_freq(rf_freq): + sys.stderr.write('Failed to set RF frequency\n') + raise SystemExit + + self.define_component("usrp", self.u) + + if type == gr.GR_SIN_WAVE or type == gr.GR_CONST_WAVE: + self.src = gr.sig_source_c (self.usb_freq (), + gr.GR_SIN_WAVE, + self.waveform_freq, + self.waveform_ampl, + self.waveform_offset) + self.define_component("src", self.src) + + elif type == gr.GR_UNIFORM or type == gr.GR_GAUSSIAN: + self.src = gr.noise_source_c (gr.GR_UNIFORM, + self.waveform_ampl) + self.define_component("src", self.src) + + else: + raise ValueError, type + + # self.file_sink = gr.file_sink (gr.sizeof_gr_complex, "siggen.dat") + # self.define_component("file_sink", self.file_sink) + + self.connect ("src", 0, "usrp", 0) + + + def usb_freq (self): + return self.u.dac_freq() / self.interp + + def usb_throughput (self): + return self.usb_freq () * 4 + + def set_freq(self, target_freq): + """ + Set the center frequency we're interested in. + + @param target_freq: frequency in Hz + @rypte: bool + + Tuning is a two step process. First we ask the front-end to + tune as close to the desired frequency as it can. Then we use + the result of that operation and our target_frequency to + determine the value for the digital up converter. + """ + r = self.u.tune(self.subdev._which, self.subdev, target_freq) + if r: + #print "r.baseband_freq =", eng_notation.num_to_str(r.baseband_freq) + #print "r.dxc_freq =", eng_notation.num_to_str(r.dxc_freq) + #print "r.residual_freq =", eng_notation.num_to_str(r.residual_freq) + #print "r.inverted =", r.inverted + return True + + return False + + + +def main (): + parser = OptionParser (option_class=eng_option) + parser.add_option ("-T", "--tx-subdev-spec", type="subdev", default=(0, 0), + help="select USRP Tx side A or B") + parser.add_option ("-f", "--rf-freq", type="eng_float", default=None, + help="set RF center frequency to FREQ") + parser.add_option ("-i", "--interp", type="int", default=64, + help="set fgpa interpolation rate to INTERP [default=%default]") + + parser.add_option ("--sine", dest="type", action="store_const", const=gr.GR_SIN_WAVE, + help="generate a complex sinusoid [default]", default=gr.GR_SIN_WAVE) + parser.add_option ("--const", dest="type", action="store_const", const=gr.GR_CONST_WAVE, + help="generate a constant output") + parser.add_option ("--gaussian", dest="type", action="store_const", const=gr.GR_GAUSSIAN, + help="generate Gaussian random output") + parser.add_option ("--uniform", dest="type", action="store_const", const=gr.GR_UNIFORM, + help="generate Uniform random output") + + parser.add_option ("-w", "--waveform-freq", type="eng_float", default=100e3, + help="set waveform frequency to FREQ [default=%default]") + parser.add_option ("-a", "--amplitude", type="eng_float", default=16e3, + help="set waveform amplitude to AMPLITUDE [default=%default]", metavar="AMPL") + parser.add_option ("-o", "--offset", type="eng_float", default=0, + help="set waveform offset to OFFSET [default=%default]") + (options, args) = parser.parse_args () + + if len(args) != 0: + parser.print_help() + raise SystemExit + + if options.rf_freq is None: + sys.stderr.write("usrp_siggen: must specify RF center frequency with -f RF_FREQ\n") + parser.print_help() + raise SystemExit + + top_block = my_graph(options.type, options.amplitude, options.waveform_freq, options.offset, + options.tx_subdev_spec, options.interp, options.rf_freq) + + runtime = gr.runtime(top_block) + + try: + # Run forever + runtime.run() + except KeyboardInterrupt: + # Ctrl-C exits + pass + +if __name__ == '__main__': + main () |