Thanks. What OS are you using, and how did you install Julia/GNU Radio? I'll attempt to fix any major problems before you try it out.
On Monday, April 20, 2015 at 9:33:18 AM UTC-6, Miguel Bazdresch wrote: > > This is great, and something I wanted to do but hadn't had time for. I'll > give it a try when I have a chance. > > On Mon, Apr 20, 2015 at 10:22 AM, Jay Kickliter <jay.ki...@gmail.com > <javascript:>> wrote: > >> I just pushed a rough draft gr-juliaffi >> <https://github.com/JayKickliter/gr-juliaffi> to GitHub. It is not a >> Julia package, but a GNU Radio module (C++/Python) that calls your Julia >> code to do the actual signal processing. >> >> If you're not familiar with GNU Radio, it is a software defined radio >> (SDR) framework. SDR is really cool. Traditional radio hardware is >> dedicated to certain kind of signal (like a satellite modem or FM >> receiver). SDR lets you use generic hardware that does little more than >> digitize the raw radio waves and send them to a computer. From there, all >> the signal processing is performed in software. There are real world >> applications >> <http://www.fsf.org/blogs/community/free-software-in-space-gnu-radio-and-the-isee-3-spacecraft> >> >> of SDR. I use it almost every day. >> >> The motivation for this block came recently when I needed something GNU >> Radio didn't have yet. At my job, we're developing new 802.15.4 hardware. >> There is an 802.15.4 <https://github.com/bastibl/gr-ieee802-15-4.git> >> out-of-tree module for GNU Radio, but it's not complete and doesn't have >> the capability of de-spreading >> <http://en.wikipedia.org/wiki/Direct-sequence_spread_spectrum> 802.15.4 900 >> MHz BPSK signals. I wrote code to de-spread the signal in Julia, and piped >> from/to GNU Radio using ZeroMQ. That works fine, but it's cumbersome. Why >> not just have GNU Radio call the Julia code directly? >> >> If you do want to use the module, please let me know what issues you run >> into when building/using it. I spent two solid days just trying to get >> cmake to find and properly set up linking to libjulia. I'm using OS X, and >> @rpath was causing the biggest problem for me. It only built when I finally >> stopped trying to tell cmake where to find libjulia and switched to >> find_library. Also I had to do an actual `make install release` in the >> Julia repo for all the headers and libraries to be in predictable >> locations. That's because the FindJulia cmake module I added calls julia >> on the command line to figure out where stuff is. The code still crashes if >> I try to run it with `jl_init(NULL) >> <https://github.com/JayKickliter/gr-juliaffi/blob/master/lib/juliablock_ff_impl.cc#L47> >> '. >> >> There's still more c++ work to be done, and I don't know c++. I just >> infinite monkey it 'till it works. I just hope I or someone else can figure >> out how to make the c++ configure itself dynamically, so it isn't necessary >> to define blocks for every combo of input/output type. Most of the repo was >> automatically created with gr_modtool. This file >> <https://github.com/JayKickliter/gr-juliaffi/blob/master/lib/juliablock_ff_impl.cc> >> >> is pretty much the whole project. It's definitely possible to change the >> number of inputs/outputs to block at runtime. Looking at the code, I think >> it may be possible to change the type as well. >> >> I was hoping have this done with some good examples in time to give a >> JuliaCon talk. Maybe next year. I'll be there anyway, if anyone's >> interested I'll give an informal demo. >> > >
