Re: [Discuss-gnuradio] Unable to find USRP

[LRK]

On Sun, May 15, 2005 at 10:13:03AM +0930, Berndt Josef Wulf wrote:
> >
> > This is similar to the problem I had with the audio device that doesn't
> > permit it to be opened by two or more processes, see the lines containing
> > EBUSY. I will try to figure out which part of benchmark_usb.py doesn't
> > close the ugen device.
> >
> 
> The problem is that benchmark_usb.py opens usrp.sink() and usrp.source(), 
> both 
> which use the open() calls to access the device. On *BSD this is not possible 
> and is exactly the some problem as seen with the audio.sink() and 
> audio.source() function that I hacked around.

I'm trying to bring up GnuRadio under FreeBSD. I have not seen the problem
with the audio device so maybe that has been fixed or FreeBSD does not see
it.

The USRP does the firmware loads using interface zero but fails after that.
Have you run into this problem with NetBSD?

Here is the error from benchmark_usb.py:

Testing 2MB/sec...
usrp_open_interface:usb_set_alt_interface: failed
could not set alt intf 1/0: Invalid argument
usrp_basic_tx: can't open tx interface
Traceback (most recent call last):
  File "./benchmark_usb.py", line 106, in ?
    main ()
  File "./benchmark_usb.py", line 96, in main
    ok = run_test (rate, verbose)
  File "./benchmark_usb.py", line 63, in run_test
    usrp_tx = usrp.sink_s (0, tx_interp)
  File "/usr/gr/local/lib/python2.4/site-packages/gnuradio/usrp.py", line 200, 
in sink_s
    return ((_usrp0_sink_s_stub, _usrp1_sink_s)[_look_for_usrp(which)])(which, 
*args, **kwargs)
  File "/usr/gr/local/lib/python2.4/site-packages/gnuradio/usrp.py", line 170, 
in _usrp1_sink_s
    u = usrp1.sink_s(which, *args, **kwargs)
  File "/usr/gr/local/lib/python2.4/site-packages/gnuradio/usrp1.py", line 
1088, in sink_s
    return _usrp1.sink_s(*args)
RuntimeError: std::runtime_error


It appears to me to open the interface 1 or 2 but then fails to set the
altinterface. I'm not up to speed on all this so any pointers to better
docs might help. I don't have a tx board so most of my tests are with
receive code but the only difference is it fails to open alt intf 2/0:
rather than alt intf 1/0.

Some of the usb man pages seem to say there will be devices like ugen0.1
but I find nothing that would actually do that. I have the permissions
set and the GR code opens and closes the /dev/ugen0 (0/0) device properly.
It must be able to read and write the control endpoint in order to load
the firmware. And since it has closed that, one would think it could open
another endpoint as necessary. Needless to say, I'm a bit confused about
endpoints/interfaces/altinterfaces/etc.

I am gradually working thru the GR->libusb->ugen code but any help would
be greatly appreciated.



-- 
LRK
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