[Discuss-gnuradio] Help using simple_framer and simple_correlator

[mjquinn]

In order to gain a better understanding of how the simple_framer and the
simple_correlator work, I am trying to implement the following code.  However,
when I run the program, I don't get any output.  I'm not sure what I'm doing
incorrectly.  Once I determine my error, I am also interested on how to use
lfsr_32k_source_s (to replace the file_source) and check_lfsr_32k to determine
error rates in this simple program.  Any help would be appreciated.

Thank you,
Mike


#!/usr/bin/env python

from gnuradio import gr
from gnuradio.eng_option import eng_option
from optparse import OptionParser
from gnuradio.wxgui import scopesink
from gnuradio.wxgui import stdgui, fftsink
import wx

class test_loopback_graph (stdgui.gui_flow_graph):
    def __init__(self, frame, panel, vbox, argv):
        stdgui.gui_flow_graph.__init__ (self, frame, panel, vbox, argv)

        parser = OptionParser (option_class=eng_option)
        parser.add_option ("-f", "--filename", type="string",
                           default="payload.txt",
                           help="read data from FILENAME")
        parser.add_option ("-R", "--repeat", action="store_true", default=False)
        (options, args) = parser.parse_args ()

       # ----------------------------------------------------------------

        payload_size = 100             # bytes

       # transmitter pipeline

        src = gr.file_source (gr.sizeof_char, options.filename, options.repeat)
        framer = gr.simple_framer (payload_size)
        bytes_to_syms = gr.bytes_to_syms ()

        self.connect (src, framer, bytes_to_syms)

        # receiver pipeline

        corr = gr.simple_correlator (payload_size)
        filesink = gr.file_sink (gr.sizeof_char, "loopback_rx.txt")

        self.connect (bytes_to_syms,corr, filesink)

def main ():
    app = stdgui.stdapp (test_loopback_graph, "Test Loopback")
    app.MainLoop ()

if __name__ == '__main__':
    main ()