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 <[email protected]>
On Tue, Jul 28, 2009 at 5:53 PM, Jonathan
Coveney<[email protected]> 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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