Re: [Discuss-gnuradio] raspi FAQ/HOWTO/recipe ??????

[Marcus D. Leech]

On 04/13/2016 11:05 PM, Jean Luc wrote:

I've been trying as well to use GR on RPi (model 3), the ultimate purpose would be radio astronomy. A smaller form factor such as RPI's makes a remote installation more palatable than a full PC.

I wasn't able to compile it on RPi but compromised on using a more recent version (3.7.9-3~bpo8+1) taken from jessie-backports. The steps are below.

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 8B48AD6246925553 7638D0442B90D010

sudo vi /etc/apt/sources.list and  add the following line:

deb http://ftp.debian.org/debian jessie-backports main

sudo apt-get update

sudo apt-get -t jessie-backports install gnuradio

On the positive side, GR works on RPi3. However, it does keep one core to 100% in many cases. This was with input from an SDR with the 2Msps rate, though. Actually, one more problem: audio output. That part didn't work ("check topology failed on audio_alsa_sink"); I posted a message on the list the other day. I cannot say it's a GR problem, could be mine; I have yet to understand what the problem is.

JL.

I'll point out that ARCH generally has up-to-date packages for this stuff, including for most of the ARM-based SBCs.

I run ARCH on various Odroid platforms, running radio-astronomy GR flow-graphs, with good success.  I run these "headless", without any
  graphical display from the Odroid--it's just the digital radio + processing platform.

On Wed, Apr 13, 2016 at 7:45 AM, Rob Roschewsk <address@hidden> wrote:

Marcus,

Thanks for responding.

I'm looking to build a headless FM receiver to record and stream public service communication (fire, police, etc.). We will stream as many channels as possible that fall into a given passband.

I already have a system running on a PC and now would like to port it to the PI.

I understand it maybe an "up hill" path, but the thought is to deploy multiple inexpensive units around a geographic area all feeding a central streaming server.

The Pi is running Raspian Jesse .... I started with the distribution packages but ran into problems right out of the blocks and thought it would be best to use the latest code before asking questions :)

I understand cross compiling is the way to go.

Since I brought it up, here was the error I saw when I tried to run the script that runs on the PC but fails spectacularly on the raspberry pi with the precompiled packages ....

address@hidden:~/sdr/multirx $ ./multirx_nogui.py -s 49 noaa.xml
linux; GNU C++ version 4.9.1; Boost_105500; UHD_003.007.003-0-unknown

high=162500000 low=162400000 span=100000
center=162450000
gr-osmosdr 0.1.3 (0.1.3) gnuradio 3.7.5
built-in source types: file osmosdr fcd rtl rtl_tcp uhd miri hackrf bladerf rfspace airspy 
Using device #0 Realtek RTL2838UHIDIR SN: 00000108
Found Elonics E4000 tuner
Exact sample rate is: 1000000.026491 Hz
Using Volk machine: generic_orc
VOLK: Error allocating memory (posix_memalign: 22)
VOLK: Error allocating memory (posix_memalign: 22)
VOLK: Error allocating memory (posix_memalign: 22)
Segmentation fault

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