Re: [Discuss-gnuradio] USRP2 modulated signal tx error

[Eric Blossom]

On Wed, Mar 25, 2009 at 12:09:36PM -0700, Johnathan Corgan wrote:
> On Wed, Mar 25, 2009 at 11:30 AM, Eric Blossom <address@hidden> wrote:
> 
> > There's a bug in the on-the-wire format for the USRP2 where we're not
> > currently transmitting the valid length of the packet.  With ethernet,
> > the minimum packet size is 64-bytes, and there are some times where
> > the host code is naively fragmenting the received samples in a way
> > that produces a packet that is too short for ethernet.
> >
> > I've opened ticket:378 on this.  It will be properly fixed when we
> > rework the on-the-wire format as part of the VRT work, but I think
> > there's an intermediate step that can avoid most cases of the problem
> > happening.
> 
> I had planned to at least temporarily work around this for gr-usrp by
> avoiding passing flowgraph data to libusrp2 that would result in these
> short fragments.  This wouldn't fix things for low-level libusrp2
> users, but it's a small change that would get us by until the real fix
> with the new VRT transport work.  Let me know if this is an issue.

Johnathan,

After a bit of lunch, I think I can fix this in libusrp2 in a few minutes.

I'll set up a developer branch in a bit and you all know when it's
ready to test.

Eric