STM32F4Discovery Interrupt per PortD Pin0 auslösen

Hallo,

bei meinem unten aufgeführen Programm soll bei einer steigenden Flanke 
an PortD Pin0 ein Interrupt ausgelöst werden und die LED an Pin14 des 
PortsD toggeln. Dies geschieht leider nicht. Im Dateianhang ist meine 
Lösung mit einem Interrupt an PortA Pin0. Damit funktioniert es. Was 
mach ich falsch?

int main (void) {

  SystemInit();

  GPIO_InitTypeDef GPIO_InitStructure;
  EXTI_InitTypeDef EXTI_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  // GPIOD Takt einschalten
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

  //  Konfiguriere PD0  soll Interrupt auslösen
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  // GPIOD Takt einschalten
  /////RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

  // Konfiguriere PD14   toggelt bei Interrupt
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOD, EXTI_PinSource0);

  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
  NVIC_Init(&NVIC_InitStructure);

    while(1)   {


        }
}


void EXTI0_IRQHandler(void){
  if(GPIO_ReadOutputDataBit(GPIOD, GPIO_Pin_14)){
    GPIO_WriteBit(GPIOD, GPIO_Pin_14, RESET);
  }else{
    GPIO_WriteBit(GPIOD, GPIO_Pin_14, SET);
  }
    EXTI_ClearITPendingBit(EXTI_Line0);
}