diff --git a/usb_istr.c b/usb_istr.c
deleted file mode 100644
--- a/usb_istr.c
+++ /dev/null
@@ -1,232 +0,0 @@
-/**
-  ******************************************************************************
-  * @file    usb_istr.c
-  * @author  MCD Application Team
-  * @version V4.0.0
-  * @date    21-January-2013
-  * @brief   ISTR events interrupt service routines
-  ******************************************************************************
-  * @attention
-  *
-  * <h2><center>&copy; COPYRIGHT 2013 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"
-#include "usb_prop.h"
-#include "usb_pwr.h"
-#include "usb_istr.h"
-
-/* Private typedef -----------------------------------------------------------*/
-/* Private define ------------------------------------------------------------*/
-/* Private macro -------------------------------------------------------------*/
-/* Private variables ---------------------------------------------------------*/
-__IO uint16_t wIstr;  /* ISTR register last read value */
-__IO uint8_t bIntPackSOF = 0;  /* SOFs received between 2 consecutive packets */
-__IO uint32_t esof_counter =0; /* expected SOF counter */
-__IO uint32_t wCNTR=0;
-
-/* Extern variables ----------------------------------------------------------*/
-/* Private function prototypes -----------------------------------------------*/
-/* Private functions ---------------------------------------------------------*/
-/* function pointers to non-control endpoints service routines */
-void (*pEpInt_IN[7])(void) =
-  {
-    EP1_IN_Callback,
-    EP2_IN_Callback,
-    EP3_IN_Callback,
-    EP4_IN_Callback,
-    EP5_IN_Callback,
-    EP6_IN_Callback,
-    EP7_IN_Callback,
-  };
-
-void (*pEpInt_OUT[7])(void) =
-  {
-    EP1_OUT_Callback,
-    EP2_OUT_Callback,
-    EP3_OUT_Callback,
-    EP4_OUT_Callback,
-    EP5_OUT_Callback,
-    EP6_OUT_Callback,
-    EP7_OUT_Callback,
-  };
-
-/*******************************************************************************
-* Function Name  : USB_Istr
-* Description    : ISTR events interrupt service routine
-* Input          :
-* Output         :
-* Return         :
-*******************************************************************************/
-void USB_Istr(void)
-{
-    uint32_t i=0;
- __IO uint32_t EP[8];
-  
-  wIstr = _GetISTR();
-
-#if (IMR_MSK & ISTR_SOF)
-  if (wIstr & ISTR_SOF & wInterrupt_Mask)
-  {
-    _SetISTR((uint16_t)CLR_SOF);
-    bIntPackSOF++;
-
-#ifdef SOF_CALLBACK
-    SOF_Callback();
-#endif
-  }
-#endif
-  /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/  
-  
-#if (IMR_MSK & ISTR_CTR)
-  if (wIstr & ISTR_CTR & wInterrupt_Mask)
-  {
-    /* servicing of the endpoint correct transfer interrupt */
-    /* clear of the CTR flag into the sub */
-    CTR_LP();
-#ifdef CTR_CALLBACK
-    CTR_Callback();
-#endif
-  }
-#endif
-  /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/  
-#if (IMR_MSK & ISTR_RESET)
-  if (wIstr & ISTR_RESET & wInterrupt_Mask)
-  {
-    _SetISTR((uint16_t)CLR_RESET);
-    Device_Property.Reset();
-#ifdef RESET_CALLBACK
-    RESET_Callback();
-#endif
-  }
-#endif
-  /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
-#if (IMR_MSK & ISTR_DOVR)
-  if (wIstr & ISTR_DOVR & wInterrupt_Mask)
-  {
-    _SetISTR((uint16_t)CLR_DOVR);
-#ifdef DOVR_CALLBACK
-    DOVR_Callback();
-#endif
-  }
-#endif
-  /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
-#if (IMR_MSK & ISTR_ERR)
-  if (wIstr & ISTR_ERR & wInterrupt_Mask)
-  {
-    _SetISTR((uint16_t)CLR_ERR);
-#ifdef ERR_CALLBACK
-    ERR_Callback();
-#endif
-  }
-#endif
-  /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
-#if (IMR_MSK & ISTR_WKUP)
-  if (wIstr & ISTR_WKUP & wInterrupt_Mask)
-  {
-    _SetISTR((uint16_t)CLR_WKUP);
-    Resume(RESUME_EXTERNAL);
-#ifdef WKUP_CALLBACK
-    WKUP_Callback();
-#endif
-  }
-#endif
-  /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
-#if (IMR_MSK & ISTR_SUSP)
-  if (wIstr & ISTR_SUSP & wInterrupt_Mask)
-  {
-
-    /* check if SUSPEND is possible */
-    if (fSuspendEnabled)
-    {
-      Suspend();
-    }
-    else
-    {
-      /* if not possible then resume after xx ms */
-      Resume(RESUME_LATER);
-    }
-    /* clear of the ISTR bit must be done after setting of CNTR_FSUSP */
-    _SetISTR((uint16_t)CLR_SUSP);
-#ifdef SUSP_CALLBACK
-    SUSP_Callback();
-#endif
-  }
-#endif
-  /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
-
-#if (IMR_MSK & ISTR_ESOF)
-  if (wIstr & ISTR_ESOF & wInterrupt_Mask)
-  {
-    /* clear ESOF flag in ISTR */
-    _SetISTR((uint16_t)CLR_ESOF);
-    
-    if ((_GetFNR()&FNR_RXDP)!=0)
-    {
-      /* increment ESOF counter */
-      esof_counter ++;
-      
-      /* test if we enter in ESOF more than 3 times with FSUSP =0 and RXDP =1=>> possible missing SUSP flag*/
-      if ((esof_counter >3)&&((_GetCNTR()&CNTR_FSUSP)==0))
-      {           
-        /* this a sequence to apply a force RESET*/
-      
-        /*Store CNTR value */
-        wCNTR = _GetCNTR(); 
-      
-        /*Store endpoints registers status */
-        for (i=0;i<8;i++) EP[i] = _GetENDPOINT(i);
-      
-        /*apply FRES */
-        wCNTR|=CNTR_FRES;
-        _SetCNTR(wCNTR);
- 
-        /*clear FRES*/
-        wCNTR&=~CNTR_FRES;
-        _SetCNTR(wCNTR);
-      
-        /*poll for RESET flag in ISTR*/
-        while((_GetISTR()&ISTR_RESET) == 0);
-        /* clear RESET flag in ISTR */
-        _SetISTR((uint16_t)CLR_RESET);
-   
-       /*restore Enpoints*/
-        for (i=0;i<8;i++)
-        _SetENDPOINT(i, EP[i]);
-      
-        esof_counter = 0;
-      }
-    }
-    else
-    {
-        esof_counter = 0;
-    }
-    
-    /* resume handling timing is made with ESOFs */
-    Resume(RESUME_ESOF); /* request without change of the machine state */
-
-#ifdef ESOF_CALLBACK
-    ESOF_Callback();
-#endif
-  }
-#endif
-} /* USB_Istr */
-
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/