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Re: [Discuss-gnuradio] Labview

From: Martin Dvh
Subject: Re: [Discuss-gnuradio] Labview
Date: Thu, 04 May 2006 02:37:48 +0200
User-agent: Debian Thunderbird 1.0.2 (X11/20051002)

paul munro wrote:
> Hi all.
> I am looking at the possibility of integrating Labview into GNURadio to
> demodulate FM. Has anyone out there looked into this?? What I am hoping
> is that labview will be able to read the complex stream from the USRP
> via the USB port.
> What I need to know is
> 1) Once the IF frequency etc is uploaded, does the USRP try to send a
> continuous stream if data regardless of whether the the python program
> is running on the PC?? Or is there 2 way communication that deals with
> buffer over/under run etc?? (I may have to unplug the usb and replug
> into a windows machine until i get a linux version of labview )

You could run the windows version of gnuradio.
It is not as mature as the linux version, but good enough for getting usrp 

> 2) Is there any easy way of accessing the data stream, and what format
> does it have. I have read that it sends 16 bit I then 16 bit Q, but is
> there a frame setup to indicate the start/end of each I and Q word??
> From what I understand, the data is sent using bulk. I am yet to look up
> the USB2.0 specification to see the format of bulk packets.
> Essentially I'm hoping I can design a driver to read the data coming
> over USB, recover the I & Q and finally demodulate the signal.
> I am not even sure if this is possible. Any help would be greatly
> appreciated.
> Regards Paul
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