Spencer, SDR isn't much different to what you did with AudioIO. Just blocks of code that take in samples and spit them out after doing something with them.
On Monday, April 20, 2015 at 12:07:54 PM UTC-6, Spencer Russell wrote: > > Super cool! One of my labmates has been playing around with SDR and I was > thinking that Julia would be great for that. Please bring a demo to > JuliaCon! > > -s > > > On Mon, Apr 20, 2015, at 12:14 PM, Miguel Bazdresch wrote: > > I'm using GnuRadio on Ubuntu mainly. I may not have a chance to try it out > until the summer, though. On a somewhat related note, something that I also > want to tackle when I have some time is a julia interface to the UHD, so > that we can control the radios directly from Julia. > > -- mb > > On Mon, Apr 20, 2015 at 11:37 AM, Jay Kickliter <[email protected] > <javascript:>> wrote: > > 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 <[email protected]> > 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. > > > > > > >
