diff --git a/usb_mem.c b/usb_mem.c
deleted file mode 100644
--- a/usb_mem.c
+++ /dev/null
@@ -1,87 +0,0 @@
-/**
-  ******************************************************************************
-  * @file    usb_mem.c
-  * @author  MCD Application Team
-  * @version V4.0.0
-  * @date    28-August-2012
-  * @brief   Utility functions for memory transfers to/from PMA
-  ******************************************************************************
-  * @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.
-  *
-  ******************************************************************************
-  */
-
-/* Includes ------------------------------------------------------------------*/
-#include "usb_lib.h"
-
-/* Private typedef -----------------------------------------------------------*/
-/* Private define ------------------------------------------------------------*/
-/* Private macro -------------------------------------------------------------*/
-/* Private variables ---------------------------------------------------------*/
-/* Extern variables ----------------------------------------------------------*/
-/* Private function prototypes -----------------------------------------------*/
-/* Private functions ---------------------------------------------------------*/
-
-/*******************************************************************************
-* Function Name  : UserToPMABufferCopy
-* Description    : Copy a buffer from user memory area to packet memory area (PMA)
-* Input          : - pbUsrBuf: pointer to user memory area.
-*                  - wPMABufAddr: address into PMA.
-*                  - wNBytes: no. of bytes to be copied.
-* Output         : None.
-* Return         : None	.
-*******************************************************************************/
-void UserToPMABufferCopy(uint8_t *pbUsrBuf, uint16_t wPMABufAddr, uint16_t wNBytes)
-{
-  uint32_t n = (wNBytes + 1) >> 1;   /* n = (wNBytes + 1) / 2 */
-  uint32_t i, temp1, temp2;
-  uint16_t *pdwVal;
-  pdwVal = (uint16_t *)(wPMABufAddr * 2 + PMAAddr);
-  for (i = n; i != 0; i--)
-  {
-    temp1 = (uint16_t) * pbUsrBuf;
-    pbUsrBuf++;
-    temp2 = temp1 | (uint16_t) * pbUsrBuf << 8;
-    *pdwVal++ = temp2;
-    pdwVal++;
-    pbUsrBuf++;
-  }
-}
-
-/*******************************************************************************
-* Function Name  : PMAToUserBufferCopy
-* Description    : Copy a buffer from user memory area to packet memory area (PMA)
-* Input          : - pbUsrBuf    = pointer to user memory area.
-*                  - wPMABufAddr = address into PMA.
-*                  - wNBytes     = no. of bytes to be copied.
-* Output         : None.
-* Return         : None.
-*******************************************************************************/
-void PMAToUserBufferCopy(uint8_t *pbUsrBuf, uint16_t wPMABufAddr, uint16_t wNBytes)
-{
-  uint32_t n = (wNBytes + 1) >> 1;/* /2*/
-  uint32_t i;
-  uint32_t *pdwVal;
-  pdwVal = (uint32_t *)(wPMABufAddr * 2 + PMAAddr);
-  for (i = n; i != 0; i--)
-  {
-    *(uint16_t*)pbUsrBuf++ = *pdwVal++;
-    pbUsrBuf++;
-  }
-}
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/