[Discuss-gnuradio] Re: problem in using: dqpsk_mod() with gr.top_block

[Van Tran]

It lacks the beginning part, so I  paste again my program:




#!/usr/bin/env python

from gnuradio import gr
from gnuradio import blks




#no GUI
#source: stream from file_source
#connect with DQPSK: input: byte stream, output:complex
#change it to 2 parts:imagine and Real
#connect with gr.complex_to_real or gr.complex_to_imag


class my_top_block(gr.top_block):

  def __init__(self):
    gr.top_block.__init__(self)

    src_data = (1,1,0,1,1,1,0,0)
    src = gr.vector_source_b (src_data)

    #input: unsigned char, output: complex
    qpsk = blks.dqpsk_mod(self,2,.35,True, False, False)
    self.connect (src,qpsk)

    real = gr.complex_to_real()
    imag = gr.complex_to_imag()
    self.connect(qpsk,real)
    self.connect(qpsk,imag)

    sink1 = gr.vector_sink_f()
    sink2 = gr.vector_sink_f()

    self.connect(real,sink1)
    self.connect(imag,sink2)


if __name__ == '__main__':
    try:
        my_top_block().run()
    except KeyboardInterrupt:
        pass


ValueError: unable to coerce endpoint



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