Merged r5463:5504 from jcorgan/snd into trunk. Work in progress, adds digital loopback and receive to FPGA code. Host receive code is still debugging only.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@5505 221aa14e-8319-0410-a670-987f0aec2ac5
Merged r5033:5116 from developer branch jcorgan/snd, with minor edits. Trunk passes distcheck. Adds gr-sounder component, see gr-sounder/README.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@5117 221aa14e-8319-0410-a670-987f0aec2ac5
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