Re: [libusb] Debugging error - libusb - Ubuntu

[Tim R. <ti...@pr...>]

On Nov 6, 2017, at 9:49 AM, Ali Bahador <ali...@ya...> wrote:
> 
> When I execute the program following note appears:
> "Unable to find the device."

Are you running as root?  Unless you have adjusted the permissions of the device using something like udev, most devices require root privilege for access.


> I'm just beginner. I thought there are standard messages that exchange between 2 devices and the program has the same structure as my usb device (both transfer in/out type are interrupt), I'm just in doubt of sizes that has been defined in each side.

The standards define the layout and format of messages, but not the content or the behavior.  The Axelson sample sends a feature report and expects an input report in response.  That behavior is specific to the device.  Unless you have programmed your device to respond in that way, the program won't work.

What IS this device, exactly?  A11B is not a standard USB vendor ID.
— 
Tim Roberts, ti...@pr...
Providenza & Boekelheide, Inc.