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#!/usr/bin/env python
#
# Copyright 2010,2011 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr, uhd
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import sys
def add_freq_option(parser):
"""
Hackery that has the -f / --freq option set both tx_freq and rx_freq
"""
def freq_callback(option, opt_str, value, parser):
parser.values.rx_freq = value
parser.values.tx_freq = value
if not parser.has_option('--freq'):
parser.add_option('-f', '--freq', type="eng_float",
action="callback", callback=freq_callback,
help="set Tx and/or Rx frequency to FREQ [default=%default]",
metavar="FREQ")
class uhd_interface:
def __init__(self, istx, args, sym_rate, sps, freq=None,
gain=None, spec=None, antenna=None):
if(istx):
self.u = uhd.usrp_sink(device_addr=args,
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=1)
else:
self.u = uhd.usrp_source(device_addr=args,
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=1)
self._args = args
self._ant = antenna
self._spec = spec
self._gain = self.set_gain(gain)
self._freq = self.set_freq(freq)
self._rate, self._sps = self.set_sample_rate(sym_rate, sps)
# Set the subdevice spec
if(spec):
self.u.set_subdev_spec(spec, 0)
# Set the antenna
if(antenna):
self.u.set_antenna(antenna, 0)
def set_sample_rate(self, sym_rate, req_sps):
start_sps = req_sps
while(True):
asked_samp_rate = sym_rate * req_sps
self.u.set_samp_rate(asked_samp_rate)
actual_samp_rate = self.u.get_samp_rate()
sps = actual_samp_rate/sym_rate
if(sps < 2):
req_sps +=1
else:
actual_sps = sps
break
if(sps != req_sps):
print "\nSymbol Rate: %f" % (sym_rate)
print "Requested sps: %f" % (start_sps)
print "Given sample rate: %f" % (actual_samp_rate)
print "Actual sps for rate: %f" % (actual_sps)
if(actual_samp_rate != asked_samp_rate):
print "\nRequested sample rate: %f" % (asked_samp_rate)
print "Actual sample rate: %f" % (actual_samp_rate)
return (actual_samp_rate, actual_sps)
def get_sample_rate(self):
return self.u.get_samp_rate()
def set_gain(self, gain=None):
if gain is None:
# if no gain was specified, use the mid-point in dB
g = self.u.get_gain_range()
gain = float(g.start()+g.stop())/2
print "\nNo gain specified."
print "Setting gain to %f (from [%f, %f])" % \
(gain, g.start(), g.stop())
self.u.set_gain(gain, 0)
return gain
def set_freq(self, freq=None):
if(freq is None):
sys.stderr.write("You must specify -f FREQ or --freq FREQ\n")
sys.exit(1)
r = self.u.set_center_freq(freq, 0)
if r:
return freq
else:
frange = self.u.get_freq_range()
sys.stderr.write(("\nRequested frequency (%f) out or range [%f, %f]\n") % \
(freq, frange.start(), frange.stop()))
sys.exit(1)
#-------------------------------------------------------------------#
# TRANSMITTER
#-------------------------------------------------------------------#
class uhd_transmitter(uhd_interface, gr.hier_block2):
def __init__(self, args, sym_rate, sps, freq=None, gain=None,
spec=None, antenna=None, verbose=False):
gr.hier_block2.__init__(self, "uhd_transmitter",
gr.io_signature(1,1,gr.sizeof_gr_complex),
gr.io_signature(0,0,0))
# Set up the UHD interface as a transmitter
uhd_interface.__init__(self, True, args, sym_rate, sps,
freq, gain, spec, antenna)
self.connect(self, self.u)
if(verbose):
self._print_verbage()
def add_options(parser):
add_freq_option(parser)
parser.add_option("-a", "--args", type="string", default="",
help="UHD device address args [default=%default]")
parser.add_option("", "--spec", type="string", default=None,
help="Subdevice of UHD device where appropriate")
parser.add_option("-A", "--antenna", type="string", default=None,
help="select Rx Antenna where appropriate")
parser.add_option("", "--tx-freq", type="eng_float", default=None,
help="set transmit frequency to FREQ [default=%default]",
metavar="FREQ")
parser.add_option("", "--tx-gain", type="eng_float", default=None,
help="set transmit gain in dB (default is midpoint)")
parser.add_option("-v", "--verbose", action="store_true", default=False)
# Make a static method to call before instantiation
add_options = staticmethod(add_options)
def _print_verbage(self):
"""
Prints information about the UHD transmitter
"""
print "\nUHD Transmitter:"
print "Args: %s" % (self._args)
print "Freq: %sHz" % (eng_notation.num_to_str(self._freq))
print "Gain: %f dB" % (self._gain)
print "Sample Rate: %ssps" % (eng_notation.num_to_str(self._rate))
print "Antenna: %s" % (self._ant)
print "Subdev Sec: %s" % (self._spec)
#-------------------------------------------------------------------#
# RECEIVER
#-------------------------------------------------------------------#
class uhd_receiver(uhd_interface, gr.hier_block2):
def __init__(self, args, sym_rate, sps, freq=None, gain=None,
spec=None, antenna=None, verbose=False):
gr.hier_block2.__init__(self, "uhd_receiver",
gr.io_signature(0,0,0),
gr.io_signature(1,1,gr.sizeof_gr_complex))
# Set up the UHD interface as a receiver
uhd_interface.__init__(self, False, args, sym_rate, sps,
freq, gain, spec, antenna)
self.connect(self.u, self)
if(verbose):
self._print_verbage()
def add_options(parser):
add_freq_option(parser)
parser.add_option("-a", "--args", type="string", default="",
help="UHD device address args [default=%default]")
parser.add_option("", "--spec", type="string", default=None,
help="Subdevice of UHD device where appropriate")
parser.add_option("-A", "--antenna", type="string", default=None,
help="select Rx Antenna where appropriate")
parser.add_option("", "--rx-freq", type="eng_float", default=None,
help="set receive frequency to FREQ [default=%default]",
metavar="FREQ")
parser.add_option("", "--rx-gain", type="eng_float", default=None,
help="set receive gain in dB (default is midpoint)")
if not parser.has_option("--verbose"):
parser.add_option("-v", "--verbose", action="store_true", default=False)
# Make a static method to call before instantiation
add_options = staticmethod(add_options)
def _print_verbage(self):
"""
Prints information about the UHD transmitter
"""
print "\nUHD Receiver:"
print "UHD Args: %s" % (self._args)
print "Freq: %sHz" % (eng_notation.num_to_str(self._freq))
print "Gain: %f dB" % (self._gain)
print "Sample Rate: %ssps" % (eng_notation.num_to_str(self._rate))
print "Antenna: %s" % (self._ant)
print "Spec: %s" % (self._spec)
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