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Re: [Discuss-gnuradio] UHD Problem...usrp2 no control response

From: Josh Blum
Subject: Re: [Discuss-gnuradio] UHD Problem...usrp2 no control response
Date: Fri, 12 Nov 2010 16:14:58 -0800
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101027 Thunderbird/3.1.6

The no control response might mean the pause frames are messing up the control packets. Does this happen in a receive only application?

One way to alleviate this would be to run the flow control branch and images. See the flow control branch on the UHD repo. and images are here: http://www.ettus.com/downloads/uhd_images/

The purpose of the multi source block is to handle channel alignment. If you dont require this, multiple single source blocks will work as well.


On 11/12/2010 02:23 PM, Justin Bracken wrote:
Hello All,

I think I have configured my USRP2 correctly and according to "UHD-USRP2
Application Notes". Im at the point where I can command line ping each
usrp2. I see the link activity leds flash and recieve responses from the
USRP2. It appears that it does this for each card and each corresponding
USRP2 connected to that card. That is I have 2 usrp2s each one is connected
to its own gigabit ethernet card.

My problem now is that when I start GRC and try to use the usrp2s I have a
problem with the USRP2 on eth1. the one on eth0 works fine. For the eth1 I
get "usrp2 no control response"  What do I do next?

In GRC, I see the single usrp2 block and the multi-usrp2 block. my
understanding is the multi block is for soft-mimo. Do I have to use one or
the other or can I use either or? That is a single usrp2 tx/rx block for
each usrp2 tx or usrp2 rx node. So if I want one tx and two rx I would have
3 single usrp2 blocks, 2 recieve or source blocks, and 1 transmit or sink

Or is it that because I have two USRP2 connected to one pc running GRC I
MUST use the multi-usrp2 block.

Please help, Im starting to learn this new version of GRC so I may be making
a newbie mistake or be plain confused. I have searched on the error and it
seems that people are discussing a python version of it but that was in
september. So I don't know if thats relvant to me. I do eventually plan on
having one USRP2 as a transciever. And it sounds relevant to that but is
that an old and hopefully dead bug?


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