Dear Kartik, The length tag name in the OFDM transmitter and the Length Tag key parameter in Stream to Tagged Stream block is the same.It is set properly.
Also, I get the error only when I try to reconfigure a flow graph. Could you please let me know the correct way to reconfigure a flow graph when they are using tags. Thanks, Damindra On Sat, Dec 24, 2016 at 4:00 AM, Kartik Patel <[email protected]> wrote: > Hi Damindra, > > In the OFDM Transmitter block, check the parameter *Length Tag Name*. > Value of that parameter should be same as *Length Tag Key* parameter in > *Stream > to Tagged Stream* block. > > See *gr-digital/examples/ofdm/tx_ofdm.grc* for an example. > > Regards, > Kartik Patel > > > > On Sat, Dec 24, 2016 4:19 AM, Damindra Bandara [email protected] > wrote: > >> Hi, >> >> I am trying to dynamically reconfigure some parameters of a flow graph. >> My flow graph is as follows. >> >> File source --> stream to tagged stream --> OFDM transmitter --> usrp sink >> >> In the top_block I do the following. >> >> tb.stop() >> tb.wait() >> <do the reconfiguration> >> tb.start() >> >> I have done parameter reconfiguration earlier(before introducing OFDM TX) >> and it worked fine. However now when I try to do the reconfiguration I get >> the following error. >> >> FATAL: Missing a required length tag on port 0 at item #160 >> thread[thread-per-block[2]: <block crc32_bb (16)>]: Missing length tag. >> FATAL: Missing a required length tag on port 0 at item #160 >> thread[thread-per-block[18]: <block crc32_bb (27)>]: Missing length tag. >> SSFATAL: Missing a required length tag on port 0 at item #0 >> FATAL: Missing a required length tag on port 0 at item #0 >> thread[thread-per-block[86]: <block ofdm_frame_equalizer_vcvc (62)>]: >> Missing length tag. >> thread[thread-per-block[53]: <block ofdm_frame_equalizer_vcvc (93)>]: >> Missing length tag. >> LLLLLLLLUU >> >> I appreciate if someone could help me to figure out what is causing this >> issue and how to fix it. >> >> Thank you, >> Damindra >> >> >> -- >> Damindra Savithri Bandara, >> Ph.D. in Information Technology (Candidate) >> George Mason University, >> Fairfax, >> Virginia >> > -- Damindra Savithri Bandara, Ph.D. in Information Technology (Candidate) George Mason University, Fairfax, Virginia
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