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Re: [Discuss-gnuradio] Error when trying to run two python programs simu

From: Josh Blum
Subject: Re: [Discuss-gnuradio] Error when trying to run two python programs simultaneously
Date: Tue, 23 Mar 2010 08:39:53 -0700
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100217 Shredder/3.0.3pre

On 03/23/2010 07:46 AM, drcabrejos wrote:

Hi All,

I have 2 (two) USRP1 and 2 (two) RFX2400 connected to each USRP1.

What I want to do is to have communication between the devices and scan for
the spectrum simultaneously.

If running programs one by one, all works great.
Running both at the same time, gives me an error saying that the USB port is
already being used.

Running: uses RFX2400 on port A
/usr/share/gnuradio/examples/digital/tunnel.py --freq 2.422G

Trying to start: uses RFX2400 on port B
/usr/share/gnuradio/examples/usrp/usrp_spectrum_sense.py -R B 2.4095G

When you have multiple usrps, you need to differentiate them by using the "which" parameter:

tunnel.py has this option on the command line:
    -w WHICH, --which=WHICH
                        select USRP board [default=0]

try ./tunnel.py <your args here> -w1

spectrum_sense.py does not have this option, so it will have to be the 0 by default or you will have to modify the script to pass which=<x> into the usrp contructor.


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