Hi I am new to python and I need to know about adding new blocks. I modified the benchmark_tx and rx.py files, so that the receiver will get the file from sender and store it in a txt file which is passed as an arguement. I also added few lines of code so that the receiver calculates the number of error bits in each packet it receives.
The program is as follows: #!/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 import struct import sys import time import binascii # from current dir import usrp_receive_path import operator #import os #print os.getpid() #raw_input('Attach and press enter: ') class my_top_block(gr.top_block): def __init__(self, demodulator, rx_callback, options): gr.top_block.__init__(self) # Set up receive path self.rxpath = usrp_receive_path.usrp_receive_path(demodulator, rx_callback, options) self.connect(self.rxpath) # ///////////////////////////////////////////////////////////////////////////// # main # ///////////////////////////////////////////////////////////////////////////// global n_rcvd, n_right def main(): global n_rcvd, n_right, bi, pattern, a, x, t, coun, tbin, i, l, abin n_rcvd = 0 n_right = 0 coun=l=0 #FILE = open("payload.dat", "a") def rx_callback(ok, payload): global n_rcvd, n_right, coun, l (pktno,) = struct.unpack('!H', payload[0:2]) n_rcvd += 1 if ok: n_right += 1 print "ok = %5s pktno = %4d n_rcvd = %4d n_right = %4d" % ( ok, pktno, n_rcvd, n_right) a =ord(payload[2:options.size]) abin=bin(a)[2:] FILE.write(payload[2:options.size]) #a=ord(payload[2:options.size]) print ('a = ' , a) print('abin=',abin) x =ord('a') #print('x=b=', x) t= operator.xor(a,x) #print("t=", t) tbin= bin(t)[2:] #print('tbin= ',tbin) i=0 l=len(abin)+l while i<len(tbin): if tbin[i]=='1': coun=coun+1 i=i+1 print("total error bits so far=",coun) print("total bits=", l) b=float(coun)/float(l) print("b=",b) demods = modulation_utils.type_1_demods() # Create Options Parser: parser = OptionParser (option_class=eng_option, conflict_handler="resolve") expert_grp = parser.add_option_group("Expert") parser.add_option("-m", "--modulation", type="choice", choices=demods.keys(), default='gmsk', help="Select modulation from: %s [default=%%default]" % (', '.join(demods.keys()),)) parser.add_option("-s", "--size", type="eng_float", default=1500, help="set packet size [default=%default]") usrp_receive_path.add_options(parser, expert_grp) for mod in demods.values(): mod.add_options(expert_grp) (options, args) = parser.parse_args () filename = args[0]; FILE = open(filename, "a") if len(args) != 1: parser.print_help(sys.stderr) sys.exit(1) if options.rx_freq is None: sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") parser.print_help(sys.stderr) sys.exit(1) # build the graph tb = my_top_block(demods[options.modulation], rx_callback, options) r = gr.enable_realtime_scheduling() if r != gr.RT_OK: print "Warning: Failed to enable realtime scheduling." tb.start() # start flow graph tb.wait() # wait for it to finish FILE.close() if __name__ == '__main__': try: main() except KeyboardInterrupt: pass I am now trying to find the received signal power in receiver node and I found many websites mention this particulat piece of code to be added to the program: alpha = 0.001 thresh = 30 # in dB, will have to adjust self.probe = gr.probe_avg_mag_sqrd_cf(thresh,alpha) self.power_sink = gr.file_sink(gr.sizeof_float, "rxpower.dat") self.connect(self.probe, self.power_sink) But I am unable to connect this probe to the rxpath. whenever i add code like: self.connect(self,self.probe) # connects the input block to the power probe self.connect(self.probe, self.rxpath)# connects the power block to the rece I get error like, ValueError: port number 0 exceeds max of (none) I think this is something related to the number of ports in some block am trying to connect. Can anyone help me with this? _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio