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Re: [Discuss-gnuradio] USRP2 VRT support

From: Alexander Chemeris
Subject: Re: [Discuss-gnuradio] USRP2 VRT support
Date: Wed, 23 Dec 2009 17:19:47 +0300

Hi Josh,

Just wondering - is someone working on VTL support for USRP1?

On Wed, Dec 23, 2009 at 00:19, Josh Blum <address@hidden> wrote:
> Folks,
> There has been much work in the past few months to get the VITA Radio
> Transport (VRT) protocol working with the USRP2. You can read more about
> the protocol here: http://www.digitalif.org/
> The branch containing this work can be found on my usrp2_vrt branch:
> http://gnuradio.org/cgit/jblum.git/log/?h=usrp2_vrt
> These changes will break the current usrp2 api. If you are just using
> the gr-usrp blocks in your python apps, there should be no difference.
> However, users making C++ calls to the usrp2 should expect to see some
> changes:
> The channel numbers and metadata for the transmit and receive methods
> have been replaced with the vrt::expanded header. Documentation for this
> can be found in vrt/include/vrt/expanded_header.h Examples of how to use
> the expanded header w/ api can be found in the usrp2/apps directory.
> This new api should give users greater control over timestamped data. We
> apologize for breaking the api, but this is an important step in the
> right direction.
> Note: The usrp2 is still using raw ethernet frames. Hence, the vita
> packets are going over raw ethernet. udp support for the usrp2 is coming
> soon.
> It would be greatly appreciated if usrp2 users out there would try out
> the branch and send us your bug reports and feedback. The usrp2 vita
> code should be merged into the mainline within a few weeks, and your
> feedback will help us greatly.
> To use this branch with the usrp2, users must burn new firmware and fpga
> images to their usrps2's sd card. The images can be found here:
> http://www.ettus.com/usrp2_vrt
> Thanks,
> -Josh
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> Discuss-gnuradio mailing list
> address@hidden
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Alexander Chemeris.

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