I'm trying to do a simple loopback using the RFX-2400. I have written
custom source and sink blocks, and everything works fine when I connect
them directly [e.g, fg.connect ( src, dst)]. However, I get weird data
in my output file when I put the USRP between them [e.g., fg.connect (
src, u_snk); fg.connect ( u_src, dst)]. There is obviously something I
do not understand about the board I'm using. I've attached my (short)
script, and would greatly appreciate it if one of you gurus would take a
look. Oh, and I'm connecting the Tx/Rx port directly to the Rx port w/
3ft of coax.
Thanks,
Lee
#!/usr/bin/env python
#
# Copyright 2004 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 2, 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., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
#
from gnuradio import gr, gru, gr_unittest, usrp
import rad
import os
import types
def pick_subdevice(u):
"""
The user didn't specify a subdevice on the command line.
If there's a daughterboard on A, select A.
If there's a daughterboard on B, select B.
Otherwise, select A.
"""
if u.db[0][0].dbid() >= 0: # dbid is < 0 if there's no d'board or a problem
return (0, 0)
if u.db[1][0].dbid() >= 0:
return (1, 0)
return (0, 0)
class qa_lee (gr_unittest.TestCase):
def setUp (self):
self.fg = gr.flow_graph ()
def tearDown (self):
self.fg = None
def test_002_rad (self):
use_usrp = True
ifile = '../../../dat/test.dat'
ofile = '../../../dat/output.dat'
if_freq = 100e3;
rf_freq = 2400.0e6
rx_decim = 16
if use_usrp:
u_src = usrp.source_c(decim_rate=rx_decim)
rx_subdev_spec = pick_subdevice(u_src)
u_src.set_mux(usrp.determine_rx_mux_value(u_src, rx_subdev_spec))
subdev = usrp.selected_subdev(u_src, rx_subdev_spec)
g = subdev.gain_range()
gain = float(g[0]+g[1])/2
subdev.set_gain(gain)
tune = u_src.tune(0, subdev, rf_freq)
tx_interp = 32
if use_usrp:
u_snk = usrp.sink_c(interp_rate=tx_interp)
u_snk.set_tx_freq(0, if_freq)
(success,actual_freq)=usrp.selected_subdev(u_snk, (0,0)).set_freq( rf_freq)
if not success:
print "Failed on Tx. RF frequency ", rf_freq
print "Tx. RF Frequency: %s" % rf_freq
D = 20000
src = rad.wvfm_source_c( ifile, 1332, D);
dst = rad.wvfm_sink_c( ofile, src, 0, 0, 39)
fg = gr.flow_graph ()
if use_usrp:
fg.connect ( src, u_snk)
fg.connect ( u_src, dst)
else:
fg.connect ( src, dst);
fg.run()
return
if __name__ == '__main__':
gr_unittest.main ()
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