I fixed the problem. The top_block on bbn_80211b_tx_port was not being
properly initialized.
It seems to be working now, but when I use 8 samples per data bit instead of
4 I randomly got the following error:
usrp2::tx_raw: FIXME: short packet: 7 items (56 bytes)
Does anyone know what this mean?
I'm sending the working code.
2009/4/2 Tiago Rogério Mück <ti...@lisha.ufsc.br>
> Hi all,
>
> I'm trying to port the tx code to the usrp2 based on Colby's branch and i'm
> having some problems. The program freezes when the 3rd packet is being sent.
>
> The program uses a gr.message_source to buffer the packets and convert them
> into a data flow to the modulator, and the problem is that, for some reason,
> the data flow isn't flowing and the packets are accumulating in the
> msg_source. Since the msg_source's queue size is 2, the method to add the
> 3rd packet to the queue blocks because the queue is full.
>
> I didn't figured out whats the problem with my code. The bbn80211b_test.py
> woks, so the problem is probably related to the connection of the modulator
> block with the usrp2 sink or to the configuration of the usrp2.
>
> I'm sending the files i have modified.
>
> 2009/3/31 Colby Boyer <csbo...@berkeley.edu>
>
> Hi all,
>>
>> I created a branch on the cgran server for the usrp2 code. If anyone is
>> interested in still using the usrp with the hier_block2, just dont use the
>> rx/tx.py files. The rest of the files should work with the usrp1.
>>
>> Cheers,
>> Colby
>>
>>
>> On Mon, Mar 30, 2009 at 3:58 PM, George Nychis <gnyc...@cmu.edu> wrote:
>>
>>> Hi all,
>>>
>>> CGRAN's trac has a core dumping issue that I still have not figured out
>>> how to address yet. So, if you're using the wiki and get blank pages or a
>>> 500 internal server error, sorry. I've been trying to sort it out, but no
>>> luck yet:
>>> http://www.gossamer-threads.com/lists/trac/users/40954
>>>
>>> It should not affect the svn server though.
>>>
>>> - George
>>>
>>>
>>> 2009/3/30 Colby Boyer <csbo...@berkeley.edu>
>>>
>>>> The cgran server seems to be down. I'll let you know when I am able to
>>>> get an account.
>>>>
>>>> On Mon, Mar 30, 2009 at 8:36 AM, Colby Boyer <colby.bo...@gmail.com>wrote:
>>>>
>>>>> Sure. I will try to get a cgran account and upload my code to their
>>>>> SVN. It would then be easy to see the changes I made.
>>>>>
>>>>>
>>>>> On Mon, Mar 30, 2009 at 2:21 AM, Costantini, Andrea <costant...@ftw.at
>>>>> > wrote:
>>>>>
>>>>>> Hi Colby,
>>>>>>
>>>>>> I am glad that I am not the only one trying to port the code.
>>>>>> I guess you are in a more advanced state. I wasn't even able to run
>>>>>> the test.py. ;-)
>>>>>>
>>>>>> Would you like to share your modified code (even if it is not
>>>>>> finished)? so that I try to understand your modifications.
>>>>>>
>>>>>> Best Regards,
>>>>>> Andrea
>>>>>>
>>>>>> P.S. For the USRP2 api, I usually compare the USRP2 and USRP swig code
>>>>>> (e.g. usrp2.py and usrp_swig.py).
>>>>>>
>>>>>>
>>>>>> Colby Boyer wrote:
>>>>>>
>>>>>>> Hi Andrea,
>>>>>>>
>>>>>>> I am also working to port the 802.11b code to the USRP2. I have
>>>>>>> finished converting the code to hier_block2, and the bbn_80211b_test.py
>>>>>>> script works correctly and it can send packets in simulation. I am
>>>>>>> currently
>>>>>>> working on modifying the rx, and tx files to connect to the USRP2, but
>>>>>>> been
>>>>>>> struggling to make progress. I have not had much luck finding any
>>>>>>> documentation for the USRP2 function calls, so I am sorta lost on what
>>>>>>> to
>>>>>>> change in rx, tx and tx transmit path files. Does anyone have any links
>>>>>>> to
>>>>>>> the usrp2 api?
>>>>>>>
>>>>>>> I would be more than happy to share the modifications I made (built
>>>>>>> largly upon Douglas's work) with rest of the GNU radio community.
>>>>>>>
>>>>>>> Regards,
>>>>>>> Colby Boyer
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> Discuss-gnuradio mailing list
>>>> Discuss-gnuradio@gnu.org
>>>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>>
>>>>
>>>
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> Discuss-gnuradio@gnu.org
>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>
>>
>
#!/usr/bin/env python
#
# Copyright 2005 Free Software Foundation, Inc.
#
# Copyright (c) 2006 BBN Technologies Corp. All rights reserved.
# Effort sponsored in part by the Defense Advanced Research Projects
# Agency (DARPA) and the Department of the Interior National Business
# Center under agreement number NBCHC050166.
#
# 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, blks2
from gnuradio import usrp2
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from bbn_80211b_pkt import *
from optparse import OptionParser
import random
import time
import struct
import sys
n2s = eng_notation.num_to_str
class bbn_80211b_transmit_path(gr.top_block):
def __init__(self, interp_rate, spb, use_barker, interface="", mac_addr=None):
gr.top_block.__init__(self)
self.normal_gain = 28000
self.u = usrp2.sink_32fc(interface, mac_addr)
dac_rate = self.u.dac_rate();
self._spb = spb
self._interp=int(interp_rate)
self.u.set_interp(self._interp)
# transmitter
self.packet_transmitter = bbn_80211b_mod_pkts(spb=spb,
alpha=0.5,
gain=self.normal_gain,
use_barker=use_barker)
self.connect(self.packet_transmitter, self.u)
#self.set_gain(self.u.gain_max()) # set max Tx gain
def set_freq(self, target_freq):
"""
Set the center frequency we're interested in.
@param target_freq: frequency in Hz
@rypte: bool
Tuning is a two step process. First we ask the front-end to
tune as close to the desired frequency as it can. Then we use
the result of that operation and our target_frequency to
determine the value for the digital up converter. Finally, we feed
any residual_freq to the s/w freq translater.
"""
tr = self.u.set_center_freq(target_freq)
if tr == None:
sys.stderr.write('Failed to set center frequency\n')
raise SystemExit, 1
return tr
def set_gain(self, gain):
self.gain = gain
self.u.set_gain(gain)
def send_pkt(self, payload='', eof=False):
return self.packet_transmitter.send_pkt(payload, eof)
def spb(self):
return self._spb
def interp(self):
return self._interp
# /////////////////////////////////////////////////////////////////////////////
# main
# /////////////////////////////////////////////////////////////////////////////
def main():
def send_pkt(payload='', eof=False):
return tb.send_pkt(payload, eof)
parser = OptionParser (option_class=eng_option)
parser.add_option("-e", "--interface", type="string", default="eth0",
help="use specified Ethernet interface [default=%default]")
parser.add_option("-m", "--mac-addr", type="string", default="",
help="use USRP2 at specified MAC address [default=None]")
parser.add_option("-f", "--freq", type="eng_float", default=2.4e9,
help= \
"set Tx and Rx frequency to FREQ [default=%default]",
metavar="FREQ")
parser.add_option("-S", "--spb", type="int", default=8,
help="set samples/baud [default=%default]")
parser.add_option("-i", "--interp", type="int", default=32,
help=
"set fpga interpolation rate to INTERP [default=%default]")
parser.add_option("-r", "--reps", type="int", default=9999,
help=
"Number of packets to send [default=%default]")
parser.add_option("-b", "--barker", action="store_true",
default=False,
help="Use Barker Spreading [default=%default]")
(options, args) = parser.parse_args ()
if len(args) != 0:
parser.print_help()
sys.exit(1)
if options.freq < 1e6:
options.freq *= 1e6
# build the graph
tb = bbn_80211b_transmit_path(options.interp, options.spb, options.barker, options.interface, options.mac_addr)
tr = tb.set_freq(options.freq)
usrp = tb.u
print ""
print "Network interface: ", options.interface
print "USRP2 address: ", usrp.mac_addr()
print "Using TX d'board id 0x%04X" % (usrp.daughterboard_id(),)
print "Tx baseband frequency: ", n2s(tr.baseband_freq)
print "Tx DUC frequency: ", n2s(tr.dxc_freq)
print "Tx residual frequency: ", n2s(tr.residual_freq)
print "Tx interpolation rate: ", usrp.interp()
print "Samples per data bit: ", tb.spb()
if options.barker == True:
print "Using Barker spreading"
tb.start() # start flow graph
# generate and send packets
n = 0
fp = open('getty.txt')
lines = fp.readlines()
payload = "Hello world"
i = 0;
#while i < len(lines):
# payload = payload + lines[i]
# i = i + 1
print ""
print ""
print "DATA:"
print ""
print payload
print ""
while n < options.reps:
print "Sending pkt ", n
send_pkt(payload, False);
n = n + 1
time.sleep(1)
send_pkt(eof=True)
tb.wait() # wait for it to finish
if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
raise SystemExit
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
