[Discuss-gnuradio] the problem with the uhd_fft.py modified

[guojun chang]

Hi,everyone
     I 'd like to watch the OFDM constellation,so I modified the
uhd_fft.py, I added some code as follows:

        demod = blks2.ofdm_demod(options)
        stream = gr.vector_to_stream(8,200)
        self.connect(self.u, (demod.ofdm_recv,0),stream,self.scope)
        self.connect((demod.ofdm_recv,1),gr.null_sink(1))

when modified the code, the graph stopped after running one or two
seconds, it looks like not receive any data.
 Could you tell me where is wrong? I appreciate any help, thanks in advance.


BR
guojun