> On Wed, Apr 24, 2013 at 1:37 PM, Charles Hearn <cmh...@virginia.edu>wrote: > >> I'm new to working on gnuradio (experience operating it with a usrp but >> not developing for it) so hopefully someone can help me out a bit here. >> >> I want to write a module to compare different signals, looking for >> differences in a few factors by passing some signal features over time to a >> python program. To do this, should I write a sync block in C++ (or >> possibly multiple sync blocks) that will keep a long history and output a >> vector of the amalgamated features at some point to a python top block for >> evaluation? >> >> >> > On Wed, Apr 24, 2013 at 10:33 PM, Charles Hearn <cmh...@virginia.edu>wrote: > Hey, just wondering if anyone could point in the right direction on just > how to write a block that will write out a feature like instantaneous > carrier phase to stdout. I've read all the tutorials on the website and > can't seem to find anything that would fit this scenario. I tried going > through the code for some of the modulation blocks, but couldn't see how > they received the phase data for something like phase modulation. > > Hey Charles,
I'm not entirely clear on what your end goal is, but from your second email I immediately thought of gr-digital/lib/digital_constellation_receiver_cb.cc Check out the area surrounding line 72. It prints some stuff to stdout, in fact it prints the phase to stdout. If you change the VERBOSE_COSTAS to 1 so you can see it you will also need to make a couple of tweaks. The print statement is broken as is because sample is not known to phase_error_tracking. (If someone wants me to write up a bug report on the tracker I can do that and submit a patch, but since it's never used I didn't think anyone would care). My solution was to just change the function signature to include sample. In regard to your first email, if you're looking to pass information between a python program you might look into using gnuradio message queues. -Nathan
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