diff --git a/usbd_desc.c b/usbd_desc.c
new file mode 100644
--- /dev/null
+++ b/usbd_desc.c
@@ -0,0 +1,293 @@
+/**
+  ******************************************************************************
+  * @file           : usbd_desc.c
+  * @date           : 03/01/2015 14:04:02  
+  * @version        : v1.0_Cube
+  * @brief          : This file implements the USB Device descriptors
+  ******************************************************************************
+  *
+  * 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.
+  *
+  ******************************************************************************
+*/
+
+/* Includes ------------------------------------------------------------------*/
+#include "usbd_core.h"
+#include "usbd_desc.h"
+#include "usbd_conf.h"
+/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
+  * @{
+  */
+
+/** @defgroup USBD_DESC 
+  * @brief USBD descriptors module
+  * @{
+  */ 
+
+/** @defgroup USBD_DESC_Private_TypesDefinitions
+  * @{
+  */ 
+/**
+  * @}
+  */ 
+
+/** @defgroup USBD_DESC_Private_Defines
+  * @{
+  */ 
+#define USBD_VID     1155
+#define USBD_LANGID_STRING     1033
+#define USBD_MANUFACTURER_STRING     "STMicroelectronics"
+#define USBD_PID_FS     22336
+#define USBD_PRODUCT_STRING_FS     "STM32 Virtual ComPort"
+#define USBD_SERIALNUMBER_STRING_FS     "00000000001A"
+#define USBD_CONFIGURATION_STRING_FS     "CDC Config"
+#define USBD_INTERFACE_STRING_FS     "CDC Interface"
+
+/**
+  * @}
+  */ 
+
+/** @defgroup USBD_DESC_Private_Macros
+  * @{
+  */ 
+/**
+  * @}
+  */ 
+
+/** @defgroup USBD_DESC_Private_Variables
+  * @{
+  */ 
+uint8_t *     USBD_FS_DeviceDescriptor( USBD_SpeedTypeDef speed , uint16_t *length);
+uint8_t *     USBD_FS_LangIDStrDescriptor( USBD_SpeedTypeDef speed , uint16_t *length);
+uint8_t *     USBD_FS_ManufacturerStrDescriptor ( USBD_SpeedTypeDef speed , uint16_t *length);
+uint8_t *     USBD_FS_ProductStrDescriptor ( USBD_SpeedTypeDef speed , uint16_t *length);
+uint8_t *     USBD_FS_SerialStrDescriptor( USBD_SpeedTypeDef speed , uint16_t *length);
+uint8_t *     USBD_FS_ConfigStrDescriptor( USBD_SpeedTypeDef speed , uint16_t *length);
+uint8_t *     USBD_FS_InterfaceStrDescriptor( USBD_SpeedTypeDef speed , uint16_t *length);
+
+#ifdef USB_SUPPORT_USER_STRING_DESC
+uint8_t *     USBD_FS_USRStringDesc (USBD_SpeedTypeDef speed, uint8_t idx , uint16_t *length);  
+#endif /* USB_SUPPORT_USER_STRING_DESC */  
+
+USBD_DescriptorsTypeDef FS_Desc =
+{
+  USBD_FS_DeviceDescriptor,
+  USBD_FS_LangIDStrDescriptor, 
+  USBD_FS_ManufacturerStrDescriptor,
+  USBD_FS_ProductStrDescriptor,
+  USBD_FS_SerialStrDescriptor,
+  USBD_FS_ConfigStrDescriptor,
+  USBD_FS_InterfaceStrDescriptor,
+};
+
+#if defined ( __ICCARM__ ) /*!< IAR Compiler */
+  #pragma data_alignment=4   
+#endif
+/* USB Standard Device Descriptor */
+__ALIGN_BEGIN uint8_t USBD_FS_DeviceDesc[USB_LEN_DEV_DESC] __ALIGN_END =
+  {
+    0x12,                       /*bLength */
+    USB_DESC_TYPE_DEVICE,       /*bDescriptorType*/
+    0x00,                       /*bcdUSB */
+    0x02,
+    0x00,                       /*bDeviceClass*/
+    0x00,                       /*bDeviceSubClass*/
+    0x00,                       /*bDeviceProtocol*/
+    USB_MAX_EP0_SIZE,          /*bMaxPacketSize*/
+    LOBYTE(USBD_VID),           /*idVendor*/
+    HIBYTE(USBD_VID),           /*idVendor*/
+    LOBYTE(USBD_PID_FS),           /*idVendor*/
+    HIBYTE(USBD_PID_FS),           /*idVendor*/
+    0x00,                       /*bcdDevice rel. 2.00*/
+    0x02,
+    USBD_IDX_MFC_STR,           /*Index of manufacturer  string*/
+    USBD_IDX_PRODUCT_STR,       /*Index of product string*/
+    USBD_IDX_SERIAL_STR,        /*Index of serial number string*/
+    USBD_MAX_NUM_CONFIGURATION  /*bNumConfigurations*/
+  } ; /* USB_DeviceDescriptor */
+
+#if defined ( __ICCARM__ ) /*!< IAR Compiler */
+  #pragma data_alignment=4   
+#endif
+
+/* USB Standard Device Descriptor */
+__ALIGN_BEGIN uint8_t USBD_LangIDDesc[USB_LEN_LANGID_STR_DESC] __ALIGN_END =
+{
+     USB_LEN_LANGID_STR_DESC,         
+     USB_DESC_TYPE_STRING,       
+     LOBYTE(USBD_LANGID_STRING),
+     HIBYTE(USBD_LANGID_STRING), 
+};
+
+#if defined ( __ICCARM__ ) /*!< IAR Compiler */
+  #pragma data_alignment=4   
+#endif
+__ALIGN_BEGIN uint8_t USBD_StrDesc[USBD_MAX_STR_DESC_SIZ] __ALIGN_END;
+/**
+  * @}
+  */ 
+
+/** @defgroup USBD_DESC_Private_FunctionPrototypes
+  * @{
+  */ 
+/**
+  * @}
+  */ 
+
+/** @defgroup USBD_DESC_Private_Functions
+  * @{
+  */ 
+
+/**
+* @brief  USBD_FS_DeviceDescriptor 
+*         return the device descriptor
+* @param  speed : current device speed
+* @param  length : pointer to data length variable
+* @retval pointer to descriptor buffer
+*/
+uint8_t *  USBD_FS_DeviceDescriptor( USBD_SpeedTypeDef speed , uint16_t *length)
+{
+  *length = sizeof(USBD_FS_DeviceDesc);
+  return USBD_FS_DeviceDesc;
+}
+
+/**
+* @brief  USBD_FS_LangIDStrDescriptor 
+*         return the LangID string descriptor
+* @param  speed : current device speed
+* @param  length : pointer to data length variable
+* @retval pointer to descriptor buffer
+*/
+uint8_t *  USBD_FS_LangIDStrDescriptor( USBD_SpeedTypeDef speed , uint16_t *length)
+{
+  *length =  sizeof(USBD_LangIDDesc);  
+  return USBD_LangIDDesc;
+}
+
+/**
+* @brief  USBD_FS_ProductStrDescriptor 
+*         return the product string descriptor
+* @param  speed : current device speed
+* @param  length : pointer to data length variable
+* @retval pointer to descriptor buffer
+*/
+uint8_t *  USBD_FS_ProductStrDescriptor( USBD_SpeedTypeDef speed , uint16_t *length)
+{
+  if(speed == 0)
+  {   
+    USBD_GetString (USBD_PRODUCT_STRING_FS, USBD_StrDesc, length);
+  }
+  else
+  {
+    USBD_GetString (USBD_PRODUCT_STRING_FS, USBD_StrDesc, length);    
+  }
+  return USBD_StrDesc;
+}
+
+/**
+* @brief  USBD_FS_ManufacturerStrDescriptor 
+*         return the manufacturer string descriptor
+* @param  speed : current device speed
+* @param  length : pointer to data length variable
+* @retval pointer to descriptor buffer
+*/
+uint8_t *  USBD_FS_ManufacturerStrDescriptor( USBD_SpeedTypeDef speed , uint16_t *length)
+{
+  USBD_GetString (USBD_MANUFACTURER_STRING, USBD_StrDesc, length);
+  return USBD_StrDesc;
+}
+
+/**
+* @brief  USBD_FS_SerialStrDescriptor 
+*         return the serial number string descriptor
+* @param  speed : current device speed
+* @param  length : pointer to data length variable
+* @retval pointer to descriptor buffer
+*/
+uint8_t *  USBD_FS_SerialStrDescriptor( USBD_SpeedTypeDef speed , uint16_t *length)
+{
+  if(speed  == USBD_SPEED_HIGH)
+  {    
+    USBD_GetString (USBD_SERIALNUMBER_STRING_FS, USBD_StrDesc, length);
+  }
+  else
+  {
+    USBD_GetString (USBD_SERIALNUMBER_STRING_FS, USBD_StrDesc, length);    
+  }
+  return USBD_StrDesc;
+}
+
+/**
+* @brief  USBD_FS_ConfigStrDescriptor 
+*         return the configuration string descriptor
+* @param  speed : current device speed
+* @param  length : pointer to data length variable
+* @retval pointer to descriptor buffer
+*/
+uint8_t *  USBD_FS_ConfigStrDescriptor( USBD_SpeedTypeDef speed , uint16_t *length)
+{
+  if(speed  == USBD_SPEED_HIGH)
+  {  
+    USBD_GetString (USBD_CONFIGURATION_STRING_FS, USBD_StrDesc, length);
+  }
+  else
+  {
+    USBD_GetString (USBD_CONFIGURATION_STRING_FS, USBD_StrDesc, length); 
+  }
+  return USBD_StrDesc;  
+}
+
+/**
+* @brief  USBD_HS_InterfaceStrDescriptor 
+*         return the interface string descriptor
+* @param  speed : current device speed
+* @param  length : pointer to data length variable
+* @retval pointer to descriptor buffer
+*/
+uint8_t *  USBD_FS_InterfaceStrDescriptor( USBD_SpeedTypeDef speed , uint16_t *length)
+{
+  if(speed == 0)
+  {
+    USBD_GetString (USBD_INTERFACE_STRING_FS, USBD_StrDesc, length);
+  }
+  else
+  {
+    USBD_GetString (USBD_INTERFACE_STRING_FS, USBD_StrDesc, length);
+  }
+  return USBD_StrDesc;  
+}
+/**
+  * @}
+  */ 
+
+/**
+  * @}
+  */ 
+
+/**
+  * @}
+  */ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/