Re: [Libusb-devel] usb_control_msg() timeout error

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

charles_ic wrote:
> Hi,
> I'm also having usb_control_msg timeout error in my code.
>
> This is the process i did:
>
> char ptr[64];
>
> usb_init();
> usb_find_busses();
> usb_find_devices();
>
> // after finding my device...
>
> usb_set_debug(0xff); // to enable debug info.
> dev=usb_open(device); // I would need to download firmware to the device so
> I need to open it first.
> usb_claim_interface(dev,0); // claim the interface
> usb_set_configuration(dev,1); // sets the first configuration.
>   

Those are in the wrong order.  Changing the configuration potentially
invalidates your interface setups.  Set the configuration first.  And,
actually, in most circumstances the set_configuration is not necessary.

-- 
Tim Roberts, ti...@pr...
Providenza & Boekelheide, Inc.