diff --git a/usb_def.h b/usb_def.h
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--- /dev/null
+++ b/usb_def.h
@@ -0,0 +1,92 @@
+/**
+  ******************************************************************************
+  * @file    usb_def.h
+  * @author  MCD Application Team
+  * @version V4.0.0
+  * @date    28-August-2012
+  * @brief   Definitions related to USB Core
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
+  *
+  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
+  * You may not use this file except in compliance with the License.
+  * You may obtain a copy of the License at:
+  *
+  *        http://www.st.com/software_license_agreement_liberty_v2
+  *
+  * Unless required by applicable law or agreed to in writing, software 
+  * distributed under the License is distributed on an "AS IS" BASIS, 
+  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  * See the License for the specific language governing permissions and
+  * limitations under the License.
+  *
+  ******************************************************************************
+  */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __USB_DEF_H
+#define __USB_DEF_H
+
+/* Includes ------------------------------------------------------------------*/
+/* Exported types ------------------------------------------------------------*/
+typedef enum _RECIPIENT_TYPE
+{
+  DEVICE_RECIPIENT,     /* Recipient device */
+  INTERFACE_RECIPIENT,  /* Recipient interface */
+  ENDPOINT_RECIPIENT,   /* Recipient endpoint */
+  OTHER_RECIPIENT
+} RECIPIENT_TYPE;
+
+
+typedef enum _STANDARD_REQUESTS
+{
+  GET_STATUS = 0,
+  CLEAR_FEATURE,
+  RESERVED1,
+  SET_FEATURE,
+  RESERVED2,
+  SET_ADDRESS,
+  GET_DESCRIPTOR,
+  SET_DESCRIPTOR,
+  GET_CONFIGURATION,
+  SET_CONFIGURATION,
+  GET_INTERFACE,
+  SET_INTERFACE,
+  TOTAL_sREQUEST,  /* Total number of Standard request */
+  SYNCH_FRAME = 12
+} STANDARD_REQUESTS;
+
+/* Definition of "USBwValue" */
+typedef enum _DESCRIPTOR_TYPE
+{
+  DEVICE_DESCRIPTOR = 1,
+  CONFIG_DESCRIPTOR,
+  STRING_DESCRIPTOR,
+  INTERFACE_DESCRIPTOR,
+  ENDPOINT_DESCRIPTOR
+} DESCRIPTOR_TYPE;
+
+/* Feature selector of a SET_FEATURE or CLEAR_FEATURE */
+typedef enum _FEATURE_SELECTOR
+{
+  ENDPOINT_STALL,
+  DEVICE_REMOTE_WAKEUP
+} FEATURE_SELECTOR;
+
+/* Exported constants --------------------------------------------------------*/
+/* Definition of "USBbmRequestType" */
+#define REQUEST_TYPE      0x60  /* Mask to get request type */
+#define STANDARD_REQUEST  0x00  /* Standard request */
+#define CLASS_REQUEST     0x20  /* Class request */
+#define VENDOR_REQUEST    0x40  /* Vendor request */
+
+#define RECIPIENT         0x1F  /* Mask to get recipient */
+
+/* Exported macro ------------------------------------------------------------*/
+/* Exported functions ------------------------------------------------------- */
+
+#endif /* __USB_DEF_H */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/