This is probably unrelated, but I once had random errors similar to this when I used an under-rated power supply with USRP. Another possibility is a loose power supply jack connector. But I guess you have pretty much ruled these out already.
juha On Feb 17, 2008 7:56 AM, Casey Tucker <[EMAIL PROTECTED]> wrote: > > I acquired another USRP with the same configuration yesterday and tested > it, > and I had the exact same results with it as I did with the first one. I also > moved > the power supply to an isolate circuit, and it had no effect. I do have > powered > speakers in my room, but I don't understand how they would have any effect > on the stability of my USB device. I use other USB and FireWire devices in > my > computer with a good amount of reliability on all of them. I've also tried > disconnecting these devices as well; nothing changes. BTW, I'm using > gnuradio-3.0.2 on windows, and 3.1.1 on linux. > > > From: [EMAIL PROTECTED] > > To: [EMAIL PROTECTED] > > > > > Casey Tucker wrote: > > > > > I've been doing some testing with a new USRP (manufactured 12/2007). My > > > configuration is an Intel USB interface on a P965-S motherboard. I > > > dual-boot XP > > > SP2 and Arch Linux. In XP I've used Cygwin and MinGW. I've tried > removing > > > all > > > but the TVRX board (which is mainly what I'm attempting to test), and my > > > problems persist. I've also switched to another USB cable just to be > sure. > > > > > > What seems to be happening, is at random intervals while running the > test > > > scripts > > > (mainly usrp_wfm_rcv.py and usrp_tv_rcv), the GUI hangs, and when I exit > > > the > > > GUI, I get messages as follow: > > > > > > uOuOuOuOuOuOread: usb_reap_async: usb_reap_async: error: A device > > > attached to the system is not functioning. > > > > I am familiar with this message. In my case, it occurs often (with Cygwin > > or MinGW) when I turn on (or sometimes off) any of several devices (desk > > lamp, power supply, amplified speakers) in my computer room. Using a > > constant-voltage isolation transformer on either the USRP or desk lamp > makes > > no difference. The desk lamp, USRP, and computer are plugged into separate > > surge suppressors or outlet boxes. Devices elsewhere in the house have no > > effect. > > > > My guess is that it is a hardware problem, but not necessarily in the USRP > > hardware. It would be interesting to see if other USB 2.0 devices that run > > continuosly at high data rates see similar disruptions, but I don't have > any > > other such devices to test. > > > > -- Don W. > > > > ________________________________ > Connect and share in new ways with Windows Live. Get it now! > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
