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diff --git a/at91lib/usb/common/core/USBStringDescriptor.h b/at91lib/usb/common/core/USBStringDescriptor.h
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+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Definition of a class for manipulating String descriptors.
+//------------------------------------------------------------------------------
+
+#ifndef USBSTRINGDESCRIPTOR_H
+#define USBSTRINGDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB String Descriptor definitions"
+///
+/// This page lists the codes and macros for USB string descriptor definition.
+///
+/// !Language IDs
+/// - USBStringDescriptor_ENGLISH_US
+///
+/// !String Descriptor Length
+/// - USBStringDescriptor_LENGTH
+///
+/// !ASCII to UNICODE convertion
+/// - USBStringDescriptor_UNICODE
+
+/// Language ID for US english.
+#define USBStringDescriptor_ENGLISH_US          0x09, 0x04
+
+/// Calculates the length of a string descriptor given the number of ascii
+/// characters/language IDs in it.
+/// \param length The ascii format string length.
+/// \return The actual data length in bytes.
+#define USBStringDescriptor_LENGTH(length)      ((length) * 2 + 2)
+/// Converts an ascii character to its unicode representation.
+/// \param ascii The ASCII character to convert
+/// \return A 2-byte-array for the UNICODE based on given ASCII
+#define USBStringDescriptor_UNICODE(ascii)      (ascii), 0
+//------------------------------------------------------------------------------
+
+#endif //#ifndef USBSTRINGDESCRIPTOR_H
+