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

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

On Tue, 17 Jan 2012, Johannes Stezenbach wrote:

> On Tue, Jan 17, 2012 at 10:42:53AM -0500, Alan Stern wrote:
> > On Tue, 17 Jan 2012, Johannes Stezenbach wrote:
> > > 
> > > 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?
> 
> USB spec section 9.1.1.5 "Configured" requires it.

You misunderstood.  I wasn't asking why you would want to put the 
device into the Configured state; I was asking why you would want to 
reset the endpoint's data toggle.

Although, come to think of it, why _would_ you want to put the device 
into the Configured state?  The only reason I can think of would be if 
the operating system didn't already take care of that for you.

Alan Stern