Place generic USB header and source files into the documentation tree.

include/libopencm3/usb/usbstd.h

@@ -1,3 +1,22 @@
+/** @defgroup usb_type_defines USB Standard Structure Definitions
+
+@brief <b>Defined Constants and Types for the USB Standard Structure  Definitions</b>
+
+@ingroup USB_defines
+
+@version 1.0.0
+
+@author @htmlonly &copy; @endhtmlonly 2010 Gareth McMullin <gareth@blacksphere.co.nz>
+
+@date 10 March 2013
+
+A set of structure definitions for the USB control structures
+defined in chapter 9 of the "Univeral Serial Bus Specification Revision 2.0"
+Available from the USB Implementers Forum - http://www.usb.org/
+
+LGPL License Terms @ref lgpl_license
+*/
+
 /*
  * This file is part of the libopencm3 project.
  *
@@ -17,6 +36,8 @@
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+/**@{*/
+
 #ifndef __USBSTD_H
 #define __USBSTD_H
 
@@ -227,3 +248,6 @@ enum usb_language_id {
 	USB_LANGID_ENGLISH_US = 0x409,
 };
 #endif
+
+/**@}*/
+