[Discuss-gnuradio] lock and unlock with transmi th_path and receive_path‏

[Carlo Donato Lecce]

Hello all,


I seem that using transmit_path and receive_path the reconfigure
of flow graph is bad.
The following code hung after the call of unlock.

I think that there are a bugs in the transmit_path because
using a gr.null_source insted of transmit_path the program not hangs.


Thanks,


Carlo.

from gnuradio import gr, gru, modulation_utils
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser

import random, time, struct, sys, math

# from current dir
from transmit_path import transmit_path
from receive_path import receive_path

 
class h_block(gr.hier_block2):
     def __init__(self):
         gr.hier_block2.__init__(self, "hello", gr.io_signature(0, 0, 0), gr.io_signature(0, 0, 0))
 
class top_block(gr.top_block):
     def __init__(self, mod_class, demod_class, rx_callback, options):
         gr.top_block.__init__(self)

         self.txpath = transmit_path(mod_class, options)
         self.rxpath = receive_path(demod_class, rx_callback, options)
 
         self.source = gr.null_source(gr.sizeof_gr_complex)
         self.sink = gr.null_sink(gr.sizeof_gr_complex)


         self.connect(self.txpath, self.sink)
        # self.connect(self.source2, self.sink2)

     def reconfigure(self):
         self.lock()
         self.disconnect(self.txpath, self.sink)
         self.sink2 = gr.null_sink(gr.sizeof_gr_complex)
         self.connect(self.txpath, self.sink2)
         self.unlock()


def main():

    global n_rcvd, n_right

    n_rcvd = 0
    n_right = 0
   
    def rx_callback(ok, payload):
        global n_rcvd, n_right
        (pktno,) = struct.unpack('!H', payload[0:2])
        n_rcvd += 1
        if ok:
            n_right += 1
        print "1 ok = %5s  pktno = %4d  n_rcvd = %4d  n_right = %4d" % (
            ok, pktno, n_rcvd, n_right)
        # print payload[2:len(payload)]

    def send_pkt(payload='', eof=False):
        return tb.txpath.send_pkt(payload, eof)

    mods = modulation_utils.type_1_mods()
    demods = modulation_utils.type_1_demods()

    parser = OptionParser(option_class=eng_option, conflict_handler ="resolve")
    expert_grp = parser.add_option_group("Expert")
    channel_grp = parser.add_option_group("Channel")

    parser.add_option("-m", "--modulation", type="choice", choices=mods.keys(),
                      default='dbpsk',
                      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="", default=False,
                      help="enable discontinous transmission (bursts of 5 packets)")

    channel_grp.add_option("", "--sample-rate", type="eng_float", default=1e5,
                           help="set speed of channel/simulation rate to RATE [default=%default]")
    channel_grp.add_option("", "--snr", type="eng_float", default=30,
                           help="set the SNR of the channel in dB [default=%default]")
    channel_grp.add_option("", "--frequency-offset", type="eng_float", default=0,
                           help="set frequency offset introduced by channel [default=%default]")
    channel_grp.add_option("", "--seed", action="", default=False,
                           help="use a random seed for AWGN noise [default=%default]")

    transmit_path.add_options(parser, expert_grp)
    receive_path.add_options(parser, expert_grp)

    for mod in mods.values():
        mod.add_options(expert_grp)
    for demod in demods.values():
        demod.add_options(expert_grp)

    (options, args) = parser.parse_args ()

    if len(args) != 0:
        parser.print_help()
        sys.exit(1)


    app = top_block(mods[options.modulation], demods[options.modulation], rx_callback, options)
    app.start()
    print "Reconfiguring h_block"
    app.reconfigure()
    print "Post reconfigure"
    app.wait()


if __name__ == '__main__':

    try:
        main()
    except KeyboardInterrupt:
        pass

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