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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_top_block(gr.top_block):
def __init__ (self):
gr.top_block.__init__(self)
# controllable values
self.interp = 64
self.waveform_type = gr.GR_SIN_WAVE
self.waveform_ampl = 16000
self.waveform_freq = 100.12345e3
self.waveform_offset = 0
self._instantiate_blocks ()
self.set_waveform_type (self.waveform_type)
def usb_freq (self):
return self.u.dac_freq() / self.interp
def usb_throughput (self):
return self.usb_freq () * 4
def set_waveform_type (self, type):
'''
valid waveform types are: gr.GR_SIN_WAVE, gr.GR_CONST_WAVE,
gr.GR_UNIFORM and gr.GR_GAUSSIAN
'''
self._configure_graph (type)
self.waveform_type = type
def set_waveform_ampl (self, ampl):
self.waveform_ampl = ampl
self.siggen.set_amplitude (ampl)
self.noisegen.set_amplitude (ampl)
def set_waveform_freq (self, freq):
self.waveform_freq = freq
self.siggen.set_frequency (freq)
def set_waveform_offset (self, offset):
self.waveform_offset = offset
self.siggen.set_offset (offset)
def set_interpolator (self, interp):
self.interp = interp
self.siggen.set_sampling_freq (self.usb_freq ())
self.u.set_interp_rate (interp)
def _instantiate_blocks (self):
self.src = None
self.u = usrp.sink_c (0, self.interp)
self.siggen = gr.sig_source_c (self.usb_freq (),
gr.GR_SIN_WAVE,
self.waveform_freq,
self.waveform_ampl,
self.waveform_offset)
self.noisegen = gr.noise_source_c (gr.GR_UNIFORM,
self.waveform_ampl)
# self.file_sink = gr.file_sink (gr.sizeof_gr_complex, "siggen.dat")
def _configure_graph (self, type):
was_running = self.is_running ()
if was_running:
self.stop ()
self.disconnect_all ()
if type == gr.GR_SIN_WAVE or type == gr.GR_CONST_WAVE:
self.connect (self.siggen, self.u)
# self.connect (self.siggen, self.file_sink)
self.siggen.set_waveform (type)
self.src = self.siggen
elif type == gr.GR_UNIFORM or type == gr.GR_GAUSSIAN:
self.connect (self.noisegen, self.u)
self.noisegen.set_type (type)
self.src = self.noisegen
else:
raise ValueError, type
if was_running:
self.start ()
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 ("-g", "--gain", type="eng_float", default=None,
help="set output gain to GAIN [default=%default]")
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
tb = my_top_block()
tb.set_interpolator (options.interp)
tb.set_waveform_type (options.type)
tb.set_waveform_freq (options.waveform_freq)
tb.set_waveform_ampl (options.amplitude)
tb.set_waveform_offset (options.offset)
# determine the daughterboard subdevice we're using
if options.tx_subdev_spec is None:
options.tx_subdev_spec = usrp.pick_tx_subdevice(tb.u)
m = usrp.determine_tx_mux_value(tb.u, options.tx_subdev_spec)
#print "mux = %#04x" % (m,)
tb.u.set_mux(m)
tb.subdev = usrp.selected_subdev(tb.u, options.tx_subdev_spec)
print "Using TX d'board %s" % (tb.subdev.side_and_name(),)
if options.gain is None:
tb.subdev.set_gain(tb.subdev.gain_range()[1]) # set max Tx gain
else:
tb.subdev.set_gain(options.gain) # set max Tx gain
if not tb.set_freq(options.rf_freq):
sys.stderr.write('Failed to set RF frequency\n')
raise SystemExit
tb.subdev.set_enable(True) # enable transmitter
try:
tb.run()
except KeyboardInterrupt:
pass
if __name__ == '__main__':
main ()
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