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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