[Discuss-gnuradio] 'gr_top_block_sptr' object has no attribute '_setup_usrp'

#!/usr/bin/env python
#
# Copyright 2008 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, eng_notation, uhd
from gnuradio.eng_option import eng_option
from optparse import OptionParser
from transmit_path import transmit_path
import sys

_dac_rate = 128e6

n2s = eng_notation.num_to_str

class tx_bpsk_block(gr.top_block):
def __init__(self, options):
gr.top_block.__init__(self, "tx_mpsk")

self._transmitter = transmit_path(options.sps,
options.excess_bw,
options.amplitude)

if_rate = options.rate*options.sps
interp = int(_dac_rate/if_rate)


print "Modulation:", n2s(options.rate), "bits/sec"
print "TX IF rate:", n2s(if_rate), "samples/sec"
print "USRP interpolation:", interp
print "DAC amplitude:", options.amplitude

#setup usrp
self._setup_usrp(options.ip,
interp,
options.gain,
options.freq)

self.connect(self._transmitter, self._usrp)

def _setup_usrp(self, ip, interp, gain, freq):
# Setup single usrp sink
self._usrp = uhd.single_usrp_sink( device_addr="addr="+ip,
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=1,
)

# Tune to center frequency
tr = self._usrp.set_center_freq(freq, 0)
if not (tr):
print "Failed to tune to center frequency!"

# Set TX gain
self._usrp.set_gain(gain, 0)
print "Gain d'board:", n2s(self._usrp.set_gain()), "dB"

def get_options():
parser = OptionParser(option_class=eng_option)
parser.add_option("--ip", "--device_addr", default=None,
help="device address", metavar="ip")
parser.add_option("-g", "--gain", type="eng_float", default=None,
help="set Rx gain (default is mid-point)")
parser.add_option("-f", "--freq", type="eng_float", default=None,
help="set frequency to FREQ", metavar="FREQ")
parser.add_option("-a", "--amplitude", type="eng_float", default=2000,
help="set Tx amplitude (0-32767) (default=%default)")
parser.add_option("-r", "--rate", type="eng_float", default=250e3,
help="Select modulation symbol rate (default=%default)")
parser.add_option("", "--sps", type="int", default=2,
help="Select samples per symbol (default=%default)")
parser.add_option("", "--excess-bw", type="eng_float", default=0.35,
help="Select RRC excess bandwidth (default=%default)")

(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)

if options.freq == None:
print "Must supply frequency as -f or --freq"
sys.exit(1)

return (options, args)

if __name__ == "__main__":
(options, args) = get_options()

tb = tx_bpsk_block(options)

try:
tb.run()
except KeyboardInterrupt:
pass
Hi

  I am trying to make digital-bert scripts work with USRP N200, RFX2400. I have changed my code a little bit. But it shows me an error saying "object has no attribute".


aravind@COE-2X85V91:~/gnuradio/gnuradio-examples/python/digital-bert$ ./benchmark_tx1.py -f 2500M
linux; GNU C++ version 4.4.5; Boost_104200; UHD_003.001.002-ba0e3c8

>>> gr_fir_ccf: using SSE
Modulation: 250k bits/sec
TX IF rate: 500k samples/sec
USRP interpolation: 256
DAC amplitude: 2000
Traceback (most recent call last):
  File "./benchmark_tx1.py", line 108, in <module>
    tb = tx_bpsk_block(options)
  File "./benchmark_tx1.py", line 52, in __init__
    self._setup_usrp(options.ip,
  File "/usr/local/lib/python2.6/dist-packages/gnuradio/gr/top_block.py", line 94, in __getattr__
    return getattr(self._tb, name)
AttributeError: 'gr_top_block_sptr' object has no attribute '_setup_usrp'

Can anyone help me out, how to resolve this error ? Attached is my little modified code.
--
Saketh Kumar