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Re: [Discuss-gnuradio] UHD Driver in E100/Beagleboard

From: Thomas Tsou
Subject: Re: [Discuss-gnuradio] UHD Driver in E100/Beagleboard
Date: Thu, 3 Mar 2011 17:29:57 -0500

On Wed, Feb 23, 2011 at 11:25 PM, Almohanad Fayez <address@hidden> wrote:
> I was wondering about people's experience with the UHD driver on the E100 or
> the Beagleboard.  I am able to use it to receive IQ data from the USRP but I
> can't seem to transmit anything from it ... if I take the same flowgraph to
> a laptop I'm able to transmit IQ using the same USRP/daughterboard and the
> UHD driver however when I try to run the same transmitter on the Beagleboard
> and I check my spectrum analyzer I don't see anything

After some bad judgement on my part, my E100 is back up and running.
Now with the USRP1 attached, I can transmit up to 4 Msps before I get
underruns using tx_timed_samples. The scope output checks out as well.
With gnuradio, however, I get underruns rather severely at any sample
rate; I didn't do any digging to find out why.

> I already did a signal capture before sending to the USRP and made sure that
> there is data getting pushed through ... is there a problem with UHD/USRP
> sinking on the E100 and the Beagleboard ???  I also made sure that I'm using
> the latest UHD firmware on the beagleboard.

Can you run some of the UHD examples without gnuradio?

> The following is the version info printed when I run the flowgraph:
> linux; GNU C++ version 4.5.3 20110214 (prerelease); Boost_104500;
> UHD_0001.20110224034946.

On the E100:

linux; GNU C++ version 4.5.2 20101204 (prerelease); Boost_104100;


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