STM32 USB OTG Interrupt löst nicht aus

Hier der Code von der Interruptinit

void USB_OTG_BSP_Init(USB_OTG_CORE_HANDLE *pdev)
{
 /* Note: On STM32F4-Discovery board only USB OTG FS core is supported. 
*/

  GPIO_InitTypeDef GPIO_InitStructure;


  RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOA , ENABLE);
  //RCC_OTGFSCLKConfig(RCC_OTGFSCLKSource_PLLVCO_Div3);

  /* Configure SOF VBUS ID DM DP Pins */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9  |
      GPIO_Pin_11 |
        GPIO_Pin_12;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_OTG1_FS) ;
  GPIO_PinAFConfig(GPIOA,GPIO_PinSource11,GPIO_AF_OTG1_FS) ;
  GPIO_PinAFConfig(GPIOA,GPIO_PinSource12,GPIO_AF_OTG1_FS) ;

  /* this for ID line debug */


  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_10;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_OTG1_FS) ;


  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
  RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_OTG_FS, ENABLE) ;



  /* Intialize Timer for delay function */
  USB_OTG_BSP_TimeInit();
}

/**
  * @brief  USB_OTG_BSP_EnableInterrupt
  *         Configures USB Global interrupt
  * @param  None
  * @retval None
  */
void USB_OTG_BSP_EnableInterrupt(USB_OTG_CORE_HANDLE *pdev)
{

  NVIC_InitTypeDef NVIC_InitStructure;
  /* Enable USB Interrupt */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

  NVIC_InitStructure.NVIC_IRQChannel = OTG_FS_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable the Overcurrent Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = HOST_OVRCURR_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure);
}