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#!/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 ()
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