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

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

Please keep the list in CC. Thanks.

On Thu, Apr 14, 2011 at 8:14 PM, Paul URVOAS <pau...@gm...> wrote:
> 2011/4/14 Xiaofan Chen <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
>>
> Hi, I use Ubuntu 9.10
> In fact, I don't succeed to use the driver of the GPIB-USB for linux yet. I
> would like to transfer manually the messages to the usb interface.
>

I see. You may want to ask NI for help regarding the GPIB-USB
driver. In any case, you may need to download the firmware
first before you can use it.


-- 
Xiaofan