Gnu-radio + USRP problem

GNU Radio
1

I’m still trying to get gr-ais going on Beagleboard (Lucid). When I
tried to
run ais_decode.py, I’ve got “uOuOuO” output. On PC everything works
fine. My
guess - BB simply can’t process that much data.

So I ran usrp_benchmark on BB to see if this was the problem. 2MB/s and
4MB/s went fine, but with higher data rates it started uOuOuO again.

In web I’ve seen people chatting about some code optimizations for BB,
which
would allow DSP run faster.

Could anyone help?

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2

Thunder87 wrote:

Could anyone help?

I think
BeagleBoard/GSoC/2010 Projects/FFTW - eLinux.org
this probably could help… At least I’ll give it a try ))

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3

About this topic about increasing DSP speed with FFTW optimization:
http://elinux.org/BeagleBoard/GSoC/2010_Projects/FFTW#Build_Instructions

three things are bothering me at the moment:

a) topic is for http://gitorious.org/gsoc2010-fftw-neon source, but
there is a newer
http://gitorious.org/~tjz/gsoc2010-fftw-neon/tjzs-gsoc2010-fftw-neon
Should I build this newest the same way?

b) as far as i understand, the topic describes compiling source on PC
and then installing it on Beagleboard. How do I compile it on
Beagleboard?

will this work if I’m configuring on BB, not on PC?
CFLAGS=“-O3 -pipe -mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp”
./configure --prefix=/usr --enable-single
–enable-shared --with-pic --host=arm-none-linux-gnueabi
–enable-armv7-cycle-counter --enable-neon

I don’t really understand what these mean and why they are needed: -O3
-pipe, --enable-single --enable-shared --with-pic, --host=arm-none-
linux-gnueabi. I think the last one isn’t needed when compiling on BB?

c) topic says I should install Mans Rullgard’s USER_PMON patch
http://git.mansr.com/?p=linux-omap;a=commitdiff;h=5170038 if I’m using
–enable-armv7a-cycle-counter. How do I install this patch?

Please help?

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