Re: [Libusb-devel] libusb_bulk_transfer timeout (Win7 x64)

[Alan S. <st...@ro...>]

On Tue, 17 Jan 2012, Johannes Stezenbach wrote:

> Hi,
> 
> On Tue, Jan 17, 2012 at 11:50:22AM +0000, Pete Batard wrote:
> > On 2012.01.17 11:00, michele.paolino wrote:
> > 
> > > libusb_set_configuration(cur_handle, 1)
> > 
> > http://www.libusb.org/wiki/windows_backend#KnownRestrictions :
> > "WinUSB cannot be used to set a device configuration that is different 
> > from the default one. This is a limitation of the Microsoft driver."
> > 
> > You should try to avoid using libusb_set_configuration on Windows (at 
> > least as long as we only support WinUSB as a driver), unless you are 
> > certain to select the default one.
> 
> Among other things, SET_CONFIGURATION resets the data toggle of
> the endpoint to DATA0.

Why would anybody want to do that?  Isn't it easier and simpler just to 
keep using the endpoint's current data toggle value?

Alan Stern