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Re: [Discuss-gnuradio] Help with Usrp Board test

From: Michael Dickens
Subject: Re: [Discuss-gnuradio] Help with Usrp Board test
Date: Fri, 4 May 2007 15:08:15 -0400

Melody -

On May 4, 2007, at 2:57 PM, Melody S wrote:
I am trying to test my Usrp board, but there are two problems,

1 ) I have downloaded and install the gnuradio from Subversion and as long as I look through the usrp/share/rev2, I have the files


and I don't have the files usrp_firmware.ihx and usrp_fpga.rbf

should I download them and install or this is because of subversion?

SVN trunk should install everything you need. What install guide are you using? If Jon Jacky's, then he knows it's a bit out of date ;)

2) Also when I try to run this command

I get the following errors

usb_control_msg failed: usb_control_msg(DeviceRequestTO): pipe is stalled usb_control_msg failed: usb_control_msg(DeviceRequestTO): pipe is stalled xfered 1.34e+08 bytes in 4.2 seconds. 3.194e+07 bytes/sec. cpu time = 0.71
0 underruns

Does this mean that I don't have the right USB or it is because I don't have the necessary files that I mentioned in question 1.

These are normal warning messages on Mac OSX. The throughput is marginally less than 32 MBps, and thus your USRP should work OK for most USB communications (32 MBps is "ideal"). Try also the "./ test_usrp_standard_rx" program & see if it gets to 32 exactly.

Go into gnuradio-examples/python/usrp:

If your USRP has an FM capable card, try running:

pythonw usrp_wfm_rcv.py -f <good_local_FM_station>

If no FM card, try:


And you might see similar messages as before, but it should usually work up to 32 MBps. This means GNU Radio is installed and being accessed correctly! - MLD

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