Louis, You can use a socket-to-pdu block, and write an external python application to send repeating data or pass along key strokes through the socket. Use a Pdu-to-tagged-stream to convert to a stream of bytes that in turn stimulated the modulator blocks. That'll make integration and customization a little easier than starting with a new, custom block.
http://docs.python.org/2/howto/sockets.html -John On Fri, Oct 25, 2013 at 11:52 AM, Louis Brown <rfe...@everestkc.net> wrote: > I'm experimenting with PSK31 transmission. I can transmit bits streamed > from a file, but to take it to the next level, I need to dynamically switch > between keyboard keystroke generated data and a repetitive 1010 without > stopping the flow. > > Is there a way in GRC (or the main GR python script) to dynamically select > between a signal source and a file source, using the signal source when the > file source is empty? The file source would be a FIFO that I would fill > with an external python script that translates keyboard strokes into a > varicoded bit stream. When that FIFO is empty I need to switch back to the > alternating 1010. I'd rather not source the 1010 from the FIFO since that > may lead to timing issues. > > I'm trying to avoid, in the short term, writing a custom GR source block, > but that may be inevitable. I read there is a way to probe data in the > flow; is there a way to stuff bits into a stream? > > Thanks, > Lou > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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