Re: [Discuss-gnuradio] Any idea what can make a usrp stop working?

[Jonathan Coveney]

I have tried unplugging it and replugging it to no avail. I guess I
don't get why it can initialize and whatnot, but can't send me a signal.

I checked system profiler, and while it does recognize the USRP Rev 4, it says that the maximum speed is 12mb. Could it be some problem has popped up with the USB interfacing? It seems most reasonable, as the programs load up and everything so the USB cord IS working (I imagine that configuring the USRP is not simply a writing operation and would involve sending info back?), but USB2 isn't?

2009/7/28 Jason Uher <address@hidden>

On Tue, Jul 28, 2009 at 5:53 PM, Jonathan Coveney<address@hidden> wrote:
> OSX. I got my USRP up and running, and now it isn't. In system profile it

> usb_control_msg failed: usb_control_msg(DeviceRequestTO): pipe is stalled
> fusb_ephandle_darwin::read_completed: Expected 32768 bytes; read 0.
> fusb_ephandle_darwin::read_completed: Expected 32768 bytes; read 0.
> fusb_ephandle_darwin::read_completed: Expected 32768 bytes; read 0.

I periodically get this error, I just unplug the usrp and plug it back
and that usually fixes the problem.

I'm not sure if there is a reason that this happens, but the cable
cycling always fixed the problem for me (there were discussions in the
past about the reliability of the USB port's solder connections, maybe
thats it?)

Jason