Hi Devin, the "padding with zeros unless samples occur within a specific time" job can be done with gr-eventstream [1] [2] , but:
If you're going to use USRP sink anyway, what about using tagged stream blocks[3]? You could replace your "Pull Source" with a "Pull Message Source" -> "PDU to tagged stream"->signal processing->"USRP Sink" (with "packet length tag name" set accordingly) Best regards, Marcus [1] https://github.com/osh/gr-eventstream [2] http://oshearesearch.com/tag/gr-eventstream/ [3] https://gnuradio.org/doc/doxygen/page_tagged_stream_blocks.html On 25.08.2015 04:00, devin kelly wrote: > I have a flowgraph that I'm trying to develop in simulation first > before deploying to some sort of hardware like a USRP. The flowgraph > begins with a ZMQ Pull Source and then I have all my signal processing > blocks afterwards (eventually there would be a UHD Sink). The ZMQ > block only produces samples when it receives a message so when it > doesn't receive samples the flowgraph doesn't run. > > If the work function for any block is only called when there are > samples in the input buffer I don't see how adding any blocks after my > ZMQ Pull Source could help. So that leaves making my own ZMQ Pull > Source that emits zeros when it has no other message. Do I have any > other options? If I add a this feature would be useful to merge back > into GR or is this not really an intended use case for GR? > > Thanks, > Devin > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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