Re: [Libusb-devel] error submitting URB: No such file or directory

[Xiaofan C. <xia...@gm...>]

On Thu, Apr 14, 2011 at 4:55 PM, Paul URVOAS <pau...@gm...> wrote:
> I am trying to communicate with an usb device (NI GPIB-USB-B) to get some
> physical measurements...

Just wondering what is the OS you are using and why would want
to use libusb for this task.

Drivers from NI:
http://zone.ni.com/devzone/cda/tut/p/id/5458

> I find the device, but the function usb_bulk_write returns the following
> error :
> <b>error submitting URB: No such file or directory</b>
> I am probably doing something wrong, and I spent lots of time to find my
> mistake... Any help pointing out my error would be appreciated.
>
>
> #define EP_OUT 0x2

>   else{printf("Connexion : succeeded\n");}
>   char dataInit[72] = "/0x09/0x1A/0x00/0x03/0x10/0x00/0x01/0x33";
>
>   for(i=0;i<2;i++){
>     returnValue = usb_bulk_write(usb_handle, EP_OUT , dataInit, 8,
> BULK_TIMEOUT);
>   }

Please post the output of "lsusb -vvv" for this paticular device and
make sure it does really use EP2 OUT.

Google seems to suggest that you need to download the EZ-USB
firmware first. It says that 0x702a should be the real USB PID after
firmware downloading.
http://permalink.gmane.org/gmane.linux.hardware.gpib.general/980

-- 
Xiaofan