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#!/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 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.
#
"""
Digital loopback (Tx to Rx) for the USRP Rev1.
"""
from gnuradio import gr
from gnuradio import usrp
def build_graph ():
tx_interp = 32 # tx should be twice rx
rx_decim = 16
fg = gr.flow_graph ()
data_src = gr.lfsr_32k_source_s ()
# usrp_tx = usrp.sink_s (0, tx_interp, 1, 0x98)
usrp_tx = usrp.sink_s (0, tx_interp)
fg.connect (data_src, usrp_tx)
usrp_rx = usrp.source_s (0, rx_decim, 1, 0x32103210, usrp.FPGA_MODE_LOOPBACK)
sink = gr.check_lfsr_32k_s ()
fg.connect (usrp_rx, sink)
# file_sink = gr.file_sink (gr.sizeof_short, "loopback.dat")
# fg.connect (usrp_rx, file_sink)
return fg
def main ():
fg = build_graph ()
try:
fg.run()
except KeyboardInterrupt:
pass
if __name__ == '__main__':
main ()
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