Re: [Discuss-gnuradio] usb_claim_interface error

[Martin Dvh]

Javs wrote:
> Group, 
> 
> I am having problems to establish the initial
> communication with the USRP with any example in the
> code. The first time I run any code
> (test_usrp_standard_tx in this case), it fails giving
> me the following error :
> -----------
> address@hidden apps]$ ./test_usrp_standard_tx
> en_interface: usb_claim_interface: failed conf 0
> could not set config 1: Operation not permitted
> open_nth_cmd_interface: open_cmd_interface failed
> die: lt-test_usrp_standard_tx: usrp_standard_tx::make
> -----------
> However, the second time I run the same code, it runs
> perfectly. Same is the case with any of the examples. 
This looks very much like the behavious we are seeing on windows.
A known bug with the usrp using windows is that the first time you run any code 
you get an error
(similar to your error) and the second time it just works.
I haven't had time to look into this much but it is interesting to see that 
this problem can also occur on other systems as windows.

What distribution and version of linux are you running, with which kernel?

Greetings,
Martin



> 
> I tried a few random experiments to figure out where
> exactly the problem is :
> 
> 1.I removed the power cable and reconnected it(USB
> remains plugged, at this point LED is at faster rate).
> Then if i try the "test_usrp_standard_tx", it gives me
> the above error (now LED slown down). After the LED
> slows down, things are normal. the slowing down of LED
> is a sign that the firmware is loaded, but my concern
> is why does it not execute the code ? 
> 
> 2. Now when things are normal, this time I removed the
> USB and replugged to usrp(power remains plugged and
> LED remains at slower rate). "test_usrp_standard_tx"
> will run now with no errors. I guess this time it
> remembered the USB association as the eeprom was alive
> with power.
> 
> 3. Following upon the usrp install doc, I tried to
> reconnect the power and usb and this time tryin the
> same code as root. Works fine with no errors.
> 
> So looked to me like its a USB permissions error for
> other users. I then checked the 'usrp' and
> 'usrp.usermap' files at stc/hotplug/usb. They seem to
> be intact as described in
> http://comsec.com/wiki?UsrpInstall
> 
> The 'usbview' positively recognises the USB connect as
> a 'unknown' device when plugged in ;and as a 'USRP Rev
> 2' when the code is run the first time.
> 
> I checked my 'fstab' file (attached) and added the
> following line 
> -----------
> /mnt/usb     /proc/bus/USB           usbfs 
>  defaults        0 0
> -----------
> I suspect this to be the culprit and i am
> investigating more on this.
> 
> Javs
> 
> 
>               
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> 
> ------------------------------------------------------------------------
> 
> LABEL=/1                /                       ext2  
>  defaults        1 1
> LABEL=/boot1            /boot                   ext3  
>  defaults        1 2
> none                    /dev/pts                devpts
>  gid=5,mode=620  0 0
> none                    /dev/shm                tmpfs 
>  defaults        0 0
> LABEL=/home             /home                   ext3  
>  defaults        1 2
> LABEL=/opt              /opt                    ext3  
>  defaults        1 2
> none                    /proc                   proc  
>  defaults        0 0
> none                    /sys                    sysfs 
>  defaults        0 0
> LABEL=/usr              /usr                    ext3  
>  defaults        1 2
> LABEL=/var              /var                    ext3  
>  defaults        1 2
> LABEL=SWAP-hda5         swap                    swap  
>  defaults        0 0
> /mnt/usb                /proc/bus/USB           usbfs 
>  defaults        0 0
> /dev/hdb                /media/cdrom            auto  
>  pamconsole,exec,noauto,managed 0 0
> /dev/fd0                /media/floppy           auto  
>  pamconsole,exec,noauto,managed 0 0
> 
> 
> ------------------------------------------------------------------------
> 
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