On Fri, 10 Jun 2005, Pete Zaitcev wrote: > Hi, All: > > I noticed (from reading usbmon traces) that we request string descriptors > with size 255, which is odd (please pardon the pub), because a string > descriptor consists of 16-bit characters and 2-byte header. Does anyone > know if this length has any meaning or is it just a thinko?
There _was_ a reason for that length: to copy the behavior of Windows. Retrieving string descriptors seems to be an area in which many devices don't work too well; I thought it was best to use a request size the manufacturers were certain to have tested. There's nothing wrong with introducing the USB_DT_STRING_SIZE constant, and I have no objection to adding a new call to usb_get_string with a request size of 256. But please don't remove the 255-byte call. If you like, add a comment explaining why it's there. Alan Stern ------------------------------------------------------- This SF.Net email is sponsored by: NEC IT Guy Games. How far can you shotput a projector? How fast can you ride your desk chair down the office luge track? If you want to score the big prize, get to know the little guy. Play to win an NEC 61" plasma display: http://www.necitguy.com/?r=20 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
