[Discuss-gnuradio] [Douglas Geiger BBN 802.11b] Porting code on USRP2 problems

[Costantini, Andrea]

Dear all,

I'm trying to port the Douglas BBN 802.11b code on the USRP2 working 
with the last version of GNU-Radio (3.2SVN)

The last version of Douglas bbn 802.11b already work with hier_blok2 but 
not with USRP2, so,

in order to do this porting I followed the recommendations below :


- 
http://www.opensubscriber.com/message/address@hidden/9944619.html

- http://sdrblog.wordpress.com/2009/03/12/port-usrp1-code-to-usrp2/


I just have modified the files "bbn_80211b_tx.py" and 
"bbn_80211b_transmit_path.py" because

it should be by means of these ones that we can access to USRP2.

I obtain the following error:


Traceback (most recent call last):
File "bbn_80211b_tx.py", line 108, in <module>
  main()
File "bbn_80211b_tx.py", line 72, in main
  tb = my_block(options.interp, options.spb, options.barker)
File "bbn_80211b_tx.py", line 22, in __init__
  self.txpath = bbn_80211b_transmit_path(interp_rate, spb, use_barker)
File 
"/home/usrptest1/bbn_80211_doug/src/examples/bbn_80211b_transmit_path.py", 
line 44, in __init__
  self.packet_transmitter = bbn_80211b_mod_pkts(tb, spb=spb,
NameError: global name 'tb' is not defined

I am not able to solve this error and debug the new code :-(

Any suggestion about this porting will be welcome

Best regards   Andrea


Here below there are my two modified codes:

##################################################
#                              bbn_802.11b_tx.py
##################################################
from gnuradio import gr, gru, blks2
from gnuradio import usrp2
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser
  import random
import time
import struct
import sys
      # from current dir
from bbn_80211b_transmit_path import bbn_80211b_transmit_path
  class my_block(gr.top_block):

          def __init__(self, interp_rate, spb, use_barker):
           gr.top_block.__init__(self)
           self.txpath = bbn_80211b_transmit_path(interp_rate, spb, 
use_barker)
                               #def __init__(self, tx_subdev_spec, 
interp_rate, spb, use_barker):
          # gr.flow_graph.__init__(self)
          # self.txpath = bbn_80211b_transmit_path(tx_subdev_spec, \
                                                 #interp_rate, spb, 
use_barker)
   # 
///////////////////////////////////////////////////////////////////////////// 

   #                                   main
  # 
///////////////////////////////////////////////////////////////////////////// 

  def main():
          def send_pkt(payload='', eof=False):
           return tb.txpath.send_pkt(payload, eof)
          def rx_callback(ok, payload):
           print "ok = %r, payload = '%s'" % (ok, payload)
          parser = OptionParser (option_class=eng_option)
       #parser.add_option("-T", "--tx-subdev-spec", type="subdev", 
default=None,
                        # help="select USRP Tx side A or B")
       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=20,
                         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 = my_block(options.interp, options.spb, options.barker)
                               #print "bitrate: %sb/sec" % 
(eng_notation.num_to_str(tb.txpath.bitrate()),)
       print "spb:     %3d" % (tb.txpath.spb(),)
       print "interp:  %3d" % (tb.txpath.interp(),)
          ok = tb.txpath.set_freq(options.freq)
       if not ok:
           print "Failed to set Tx frequency to %s" % 
(eng_notation.num_to_str(options.freq),)
           raise SystemExit
          tb.start()                       # start flow graph
          # generate and send packets
       n = 0
          fp = open('getty.txt')
       lines = fp.readlines()
       payload = ""
       i = 0;
       while i < len(lines):
           payload = payload + lines[i]
           i = i + 1
          while n < options.reps:
           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:
           pass



##################################################
#                              bbn_802.11b_trasmit_path.py
################################################## from gnuradio import 
gr, gru, blks2
from gnuradio import usrp2
from bbn_80211b_pkt import *
      # 
///////////////////////////////////////////////////////////////////////////// 

   #                              transmit path
   # 
///////////////////////////////////////////////////////////////////////////// 

  class bbn_80211b_transmit_path(gr.hier_block2):
       def __init__(self, interp, spb, use_barker):   #def 
__init__(self, subdev_spec, interp, spb, use_barker):
              self.normal_gain = 28000

              self.u = usrp2.sink_32fc()       #self.u = usrp.sink_c()
           dac_rate = self.u.dac_rate();
              self._spb = spb
           self._interp=int(interp)
           self.u.set_interp(self._interp)   # 
self.u.set_interp_rate(self._interp)
              # determine the daughterboard subdevice we're using
           #if subdev_spec is None:
               #subdev_spec = usrp.pick_tx_subdevice(self.u)
              #self.u.set_mux(usrp.determine_tx_mux_value(self.u, 
subdev_spec))
           #self.subdev = usrp.selected_subdev(self.u, subdev_spec)
           #print "Using TX d'board %s" % (self.subdev.side_and_name(),)
              
********************************transmitter************************************** 

           """self.packet_transmitter = bbn_80211b_mod_pkts(fg, spb=spb,
                                                         alpha=0.5,
                                                         
gain=self.normal_gain,
                                                         
use_barker=use_barker)
           fg.connect(self.packet_transmitter, self.u)
      gr.hier_block.__init__(self, fg, None, None)
              self.set_gain(self.subdev.gain_range()[1])  # set max Tx 
gain
           self.set_auto_tr(True)    # enable Auto Transmit/Receive 
switching"""


              self.packet_transmitter = bbn_80211b_mod_pkts(tb, spb=spb,
                                                         alpha=0.5,
                                                         
gain=self.normal_gain,
                                                         
use_barker=use_barker)
           tb.connect(self.packet_transmitter, self.u)
           gr.hier_block.__init__(self, tb, None, None)                
           self.set_gain(self.usrp2.gain_range()[1])            
           self.set_auto_tr(True)
           
*************************************************************************************** 



       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.
           """
           r = self.u.set_center_freq(target_freq)  # r = 
self.u.tune(self.subdev.which(), self.subdev, target_freq)
           if r:
               # Could use residual_freq in s/w freq translator
               return True
              return False
          def set_gain(self, gain):
           self.gain = gain
           self.usrp2.set_gain(gain)   #self.subdev.set_gain(gain)
          #def set_auto_tr(self, enable):
           #return self.subdev.set_auto_tr(enable)
                 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