diff --git a/usbd_cdc_if.h b/usbd_cdc_if.h
new file mode 100644
--- /dev/null
+++ b/usbd_cdc_if.h
@@ -0,0 +1,60 @@
+/**
+  ******************************************************************************
+  * @file           : usbd_cdc_if.h
+  * @author         : MCD Application Team
+  * @version        : V1.1.0
+  * @date           : 19-March-2012
+  * @brief          : Header for usbd_cdc_if file.
+  ******************************************************************************
+  * COPYRIGHT(c) 2015 STMicroelectronics
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  * 1. Redistributions of source code must retain the above copyright notice,
+  * this list of conditions and the following disclaimer.
+  * 2. Redistributions in binary form must reproduce the above copyright notice,
+  * this list of conditions and the following disclaimer in the documentation
+  * and/or other materials provided with the distribution.
+  * 3. Neither the name of STMicroelectronics nor the names of its contributors
+  * may be used to endorse or promote products derived from this software
+  * without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.
+  *
+  ******************************************************************************
+*/
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __USBD_CDC_IF_H
+#define __USBD_CDC_IF_H
+
+/* Includes ------------------------------------------------------------------*/
+#include "usbd_cdc.h"
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+/* Exported cariables --------------------------------------------------------*/
+extern USBD_CDC_ItfTypeDef  USBD_Interface_fops_FS;
+
+/* Exported macro ------------------------------------------------------------*/
+/* Exported functions ------------------------------------------------------- */
+/** @defgroup USBD_CDC_IF_Exported_FunctionsPrototype
+  * @{
+  */ 
+uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t Len);
+
+/**
+  * @}
+  */ 
+#endif /* __USBD_CDC_IF_H */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/