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

[Josh Blum]

Ahh I see. The rule is, one process per usrp. Only one process can have 
the usb handle, send/recv, and handle control per usrp device. 
Therefore, you will have to make a custom app that combines the 
utilities of tunnel.py and spectrum_sense.py

-Josh


On 03/23/2010 09:52 AM, drcabrejos wrote:
> Josh,
>
> Thanks for the prompt reply.
>
> I tried using this command, but this command seems to be applied if I have 2
> USRPs connected to a single computer.
>
> On my case, I have 2 computers and 1 USRP connected to each computer.
>
> Each USRP have 2 RFX2400 daughterboards.
>
> I'm trying to run both programs "tunnel.py" and "usrp_spectrum_sense.py" at
> the same time, each one using a different daughterboard.
>
> tunnel.py would use side A while usrp_spectrum_sense.py would use side B.
>
> Then I got the error saying that the USB port was already in use and would
> not be able to run the second program.
>
> Would it be possible to run both programs simultaneously in 1 USRP. This is
> because on both sides I'd be doing the same thing. Spectrum sensing and
> continuous communication.
>
> Thanks!
>
> David Cabrejos
>
>
> Josh Blum-2 wrote:
> > 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
> > > 2.4625G
> >
> > 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.
> >
> > -josh
> >
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio