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Re: [Discuss-gnuradio] question of dual transmitter/receiver


From: Fisheep
Subject: Re: [Discuss-gnuradio] question of dual transmitter/receiver
Date: Mon, 26 Jul 2010 05:55:24 -0700 (PDT)

Hi,

It seems you have two daughterboards on one USRP1, and you want to
communicate with these two daughterboards.
Maybe you could take a look at fm_tx_2_daughterboards.py first(in
/gnuradio-examples/python/usrp/.).
>From your code, I think you didn't modify the USRP setting that causes your
code fail.

Hope that helps,

Fisheep



YouheiFujii wrote:
> 
> Hi all,
> 
> I'd like to ask some questions about dual transmitter/receiver on USRP1.
> 
> I want to make dual transmitter/receiver
> by remodeling benchmark_tx/rx.py.
> 
> In detail,
> I want to use two daughterboard       (two FLEX400) on one USRP1.
> The pair of side-A transmit and receive on 412MHz,
> and the pair of side-B transmit and receive on 420MHz.
> 
> 
>   USRP1(tx only)        USRP1(rx only)
>   +------------+        +------------+
>   |            |        |            |
>   |db1:        | 420MHz |db1:        |
>   | FLEX400(A)------------FLEX400(A) |
>   |            |        |            |
>   |db2:        |        |db2:        |
>   | FLEX400(B)------------FLEX400(B) |
>   |            | 412MHz |            |
>   +------------+        +------------+
> 
> 
> Now I made tx-node's program like attachment file,
> and execute this file.
> -----
> $ sudo python dual_tx.py -f 412M
> -----
> 
> However, I got the following error.
> -----
> user:/usr/share/gnuradio/examples/digital$ sudo python dual_tx.py -f 412M
> {'verbose': False, 'discontinuous': False, 'samples_per_symbol': 2,
> 'usrpx': None, 'interp': None, 'fusb_block_size': 0, 'megabytes': 1.0,
> 'rx_freq': 412000000.0, 'size': 1500, 'show_tx_gain_range': False,
> 'log': False, 'tx_subdev_spec': (0, 0), 'fusb_nblocks': 0, 'lo_offset':
> None, 'tx_gain': None, 'which': 0, 'modulation': 'gmsk', 'excess_bw':
> 0.34999999999999998, 'bt': 0.34999999999999998, 'interface': 'eth0',
> 'freq': None, 'bitrate': 100000.0, 'from_file': None, 'tx_freq':
> 420000000, 'mac_addr': '', 'tx_amplitude': 0.25, 'gray_code': True}
>>>> gr_fir_fff: using SSE
> Requested TX Bitrate: 100k Actual Bitrate: 125k
> @@@@@
> {'verbose': False, 'discontinuous': False, 'samples_per_symbol': 2,
> 'usrpx': None, 'interp': None, 'fusb_block_size': 0, 'megabytes': 1.0,
> 'rx_freq': 412000000.0, 'size': 1500, 'show_tx_gain_range': False,
> 'log': False, 'tx_subdev_spec': (1, 0), 'fusb_nblocks': 0, 'lo_offset':
> None, 'tx_gain': None, 'which': 0, 'modulation': 'gmsk', 'excess_bw':
> 0.34999999999999998, 'bt': 0.34999999999999998, 'interface': 'eth0',
> 'freq': None, 'bitrate': 100000.0, 'from_file': None, 'tx_freq':
> 412000000, 'mac_addr': '', 'tx_amplitude': 0.25, 'gray_code': True}
> usrp_open_interface:usb_claim_interface: failed interface 1
> could not claim interface 1: Device or resource busy
> usrp_basic_tx: can't open tx interface
> Traceback (most recent call last):
>   File "dual_tx.py", line 150, in <module>
>     main()
>   File "dual_tx.py", line 109, in main
>     tb = my_top_block(mods[options.modulation], options)
>   File "dual_tx.py", line 54, in __init__
>     self.txpath_b = usrp_transmit_path.usrp_transmit_path(modulator,
> options)
>   File "/usr/share/gnuradio/examples/digital/usrp_transmit_path.py",
> line 67, in __init__
>     self._setup_usrp_sink(options)
>   File "/usr/share/gnuradio/examples/digital/usrp_transmit_path.py",
> line 76, in _setup_usrp_sink
>     self.u = usrp_options.create_usrp_sink(options)
>   File "/usr/share/gnuradio/examples/digital/usrp_options.py", line 119,
> in create_usrp_sink
>     gain=options.tx_gain,
>   File "/usr/share/gnuradio/examples/digital/generic_usrp.py", line 199,
> in __init__
>     _generic_usrp_base.__init__(self, **kwargs)
>   File "/usr/share/gnuradio/examples/digital/generic_usrp.py", line 57,
> in __init__
>     elif usrpx == '1' or self._subdev_spec: self._setup_usrpx(USRP1_TYPE)
>   File "/usr/share/gnuradio/examples/digital/generic_usrp.py", line 76,
> in _setup_usrpx
>     if self._type == USRP1_TYPE: self._setup_usrp1()
>   File "/usr/share/gnuradio/examples/digital/generic_usrp.py", line 229,
> in _setup_usrp1
>     fusb_nblocks=self._fusb_nblocks)
>   File "/usr/lib/python2.6/dist-packages/gnuradio/usrp/usrp_swig.py",
> line 2412, in sink_c
>     return _usrp_swig.sink_c(*args, **kwargs)
> RuntimeError: can't open usrp
> user:/usr/share/gnuradio/examples/digital$
> -----
> 
> 
> I think, I couldn't make two txpath.
> (I can make "txpath_a", but can't make "txpath_b")
> But we can make two path ( txpath and rxpath) in tunnel.py.
> Why I can't make two txpath like this way?
> 
> I can't  make dual transmit path like this way.
> 
> Does anyone has some idea to make ?
> If you know, please tell me dual transmit path technique.
> 
> 
> Thanks,
> youhei
> 
> 
> 
> #!/usr/bin/env python
> #
> # Copyright 2005,2006,2007,2009 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, gru, modulation_utils
> from gnuradio import usrp
> from gnuradio import eng_notation
> from gnuradio.eng_option import eng_option
> from optparse import OptionParser
> 
> import random, time, struct, sys
> 
> # from current dir
> import usrp_transmit_path
> 
> #import os 
> #print os.getpid()
> #raw_input('Attach and press enter')
> 
> class my_top_block(gr.top_block):
>     def __init__(self, modulator, options):
>         gr.top_block.__init__(self)
>         
>         # options setting for side A
>         options.tx_subdev_spec = (0,0)
>         options.tx_freq = 420000000
>         print options
>         self.txpath_a = usrp_transmit_path.usrp_transmit_path(modulator,
> options)
>         print "@@@@@"
>         
>         # options setting for side B
>         options.tx_subdev_spec = (1,0)
>         options.tx_freq = 412000000
>         print options
>         self.txpath_b = usrp_transmit_path.usrp_transmit_path(modulator,
> options)
>         print "@@@@@"
>         
>         self.connect(self.txpath_a)
>         self.connect(self.txpath_b)
> 
> 
> #
> /////////////////////////////////////////////////////////////////////////////
> #                                   main
> #
> /////////////////////////////////////////////////////////////////////////////
> 
> def main():
> 
>     def rx_callback(ok, payload):
>         print "ok = %r, payload = '%s'" % (ok, payload)
> 
>     mods = modulation_utils.type_1_mods()
> 
>     parser = OptionParser(option_class=eng_option,
> conflict_handler="resolve")
>     expert_grp = parser.add_option_group("Expert")
> 
>     parser.add_option("-m", "--modulation", type="choice",
> choices=mods.keys(),
>                       default='gmsk',
>                       help="Select modulation from: %s
> [default=%%default]"
>                             % (', '.join(mods.keys()),))
> 
>     parser.add_option("-s", "--size", type="eng_float", default=1500,
>                       help="set packet size [default=%default]")
>     parser.add_option("-M", "--megabytes", type="eng_float", default=1.0,
>                       help="set megabytes to transmit [default=%default]")
>     parser.add_option("","--discontinuous", action="store_true",
> default=False,
>                       help="enable discontinous transmission (bursts of 5
> packets)")
>     parser.add_option("","--from-file", default=None,
>                       help="use file for packet contents")
> 
>     usrp_transmit_path.add_options(parser, expert_grp)
> 
>     for mod in mods.values():
>         mod.add_options(expert_grp)
> 
>     (options, args) = parser.parse_args ()
> 
>     if len(args) != 0:
>         parser.print_help()
>         sys.exit(1)
> 
>     if options.tx_freq is None:
>         sys.stderr.write("You must specify -f FREQ or --freq FREQ\n")
>         parser.print_help(sys.stderr)
>         sys.exit(1)
> 
>     if options.from_file is not None:
>         source_file = open(options.from_file, 'r')
> 
>     # build the graph
>     tb = my_top_block(mods[options.modulation], options)
> 
>     r = gr.enable_realtime_scheduling()
>     if r != gr.RT_OK:
>         print "Warning: failed to enable realtime scheduling"
> 
>     tb.start()                       # start flow graph
>     
>    
>     # generate and send packets
>     nbytes = int(1e6 * options.megabytes)
>     n = 0
>     pktno = 0
>     pkt_size = int(options.size)
> 
>     while n < nbytes:
>         if options.from_file is None:
>             data = (pkt_size - 2) * chr(pktno & 0xff) 
>         else:
>             data = source_file.read(pkt_size - 2)
>             if data == '':
>                 break;
> 
>         payload = struct.pack('!H', pktno & 0xffff) + data
>         
>         tb.txpath_a.send_pkt(payload) #0724#
>         tb.txpath_b.send_pkt(payload) #0724#
>         
>         n += len(payload)
>         sys.stderr.write('.')
>         if options.discontinuous and pktno % 5 == 4:
>             time.sleep(1)
>         pktno += 1
>         
>     tb.txpath_a.send_pkt_a(eof=True) #0724#
>     tb.txpath_b.send_pkt_b(eof=True) #0724#
> 
>     tb.wait()                       # wait for it to finish
> 
> if __name__ == '__main__':
>     try:
>         main()
>     except KeyboardInterrupt:
>         pass
> 
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> 

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