3 # Copyright 2004 Free Software Foundation, Inc.
5 # This file is part of GNU Radio
7 # GNU Radio is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3, or (at your option)
12 # GNU Radio is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with GNU Radio; see the file COPYING. If not, write to
19 # the Free Software Foundation, Inc., 51 Franklin Street,
20 # Boston, MA 02110-1301, USA.
24 Digital loopback (Tx to Rx) for the USRP Rev1.
27 from gnuradio import gr
28 from gnuradio import usrp
32 tx_interp = 32 # tx should be twice rx
37 data_src = gr.lfsr_32k_source_s ()
39 # usrp_tx = usrp.sink_s (0, tx_interp, 1, 0x98)
40 usrp_tx = usrp.sink_s (0, tx_interp)
42 fg.connect (data_src, usrp_tx)
44 usrp_rx = usrp.source_s (0, rx_decim, 1, 0x32103210, usrp.FPGA_MODE_LOOPBACK)
46 sink = gr.check_lfsr_32k_s ()
47 fg.connect (usrp_rx, sink)
49 # file_sink = gr.file_sink (gr.sizeof_short, "loopback.dat")
50 # fg.connect (usrp_rx, file_sink)
58 except KeyboardInterrupt:
61 if __name__ == '__main__':