Re: [Discuss-gnuradio] USRP and gnuradio errors - seems to disconnectoften

[Don Ward]

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.

> usb_control_msg failed: error sending control message: win error: The 
> device
> does not recognize the command.

> usb_control_msg failed: error sending control message: win error: The 
> device
> does not recognize the command
>
> usrp_basic_rx: set_fpga_rx_enable failed
> usb_control_msg failed: error sending control message: win error: The 
> device
> does not recognize the command.

>

> usb_control_msg failed: error sending control message: win error: The 
> device
> does not recognize the command.

> usrp_basic_rx: failed to fini AD9862 RX regs

I have not noticed these other messages.

> I've tried using two versions of usblib (0.1.10.1 and 0.1.12.1), and even 
> tried
> loading different firmware. The result is always the same. It also does 
> not matter
> which environment I'm using, Cygwin, MinGW, or Linux; the result is the 
> same.
> The other board I've tried using is the FLEX900 -- same results with its 
> scripts.

I am using LFRX and also get similar errors under Linux.

> I'm left to assume that I have faulty hardware, but I'm wondering if I'm 
> the only
> one who is experiencing such problems. Any ideas? Anyone? I've followed 
> the
> wiki instructions exactly.

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.