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

[Jonathan Coveney]

I am on a 2nd gen macbook, so it does have USB2. The weirdest part is a) that it DID work and b) that the USRP still can get the firmware and whatnot, but it's only when it starts polling for stuff that it seems not to work

2009/7/29 Michael Dickens <address@hidden>

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 <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.