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

Which Mac type are you using?  PPC Mac's built-in USB 2.0 isn't good  
enough; you'll want a PC-card or PCI solution instead.  My dual 1.25  
GHz G4 Mac can do about 10 M-Bytes/s native, but with a $15 drop-in  
USB 2.0 card, it can easily handle 32 MB/s.  Intel Mac's have good USB  
2.0, and even the least expensive of them can easily handle 32 MB/s ..  
amazing what a difference a different architecture makes.

On PPC Macs using native USB, make sure your total data transport  
(both input and output) is "low" ... meaning decimate / interpolate as  
much as possible in the FPGA.

On Jul 29, 2009, at 11:02 AM, Jonathan Coveney wrote:

> 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 <jasonuher@xxxxxxxxx>
> On Tue, Jul 28, 2009 at 5:53 PM, Jonathan  
> Coveney<jcoveney@xxxxxxxxx> 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.


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