对于F4，将ADC例程上增加了模拟看门狗中断，为什么执行不了中断服务函数呢？

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#include "adc.h"
#include "delay.h"       
#include "led.h"

//3õê¼»ˉADC                                                                                                                          
void  Adc_Init(void)
{   
  GPIO_InitTypeDef  GPIO_InitStructure;
        ADC_CommonInitTypeDef ADC_CommonInitStructure;
        ADC_InitTypeDef       ADC_InitStructure;
        NVIC_InitTypeDef NVIC_InitStucture;
       
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//ê1ÄüGPIOAê±Öó
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //ê1ÄüADC1ê±Öó

  //Ïè3õê¼»ˉADC1í¨μà5 IO¿ú
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;//PA5 í¨μà5
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//Ä￡Äaêäèë
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;//2»′øéÏÏÂà-
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉ  

        RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE);          //ADC1¸′λ
        RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE);        //¸′λ½áêø         

       
  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//¶àá￠Ä￡ê½
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//ὸö2éÑù½×¶ÎÖ®¼äμÄÑó3ù5¸öê±Öó
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; //DMAê§Äü
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;//Ô¤·ÖÆμ4·ÖÆμ¡￡ADCCLK=PCLK2/4=84/4=21Mhz,ADCê±Öó×îoÃ2»òa3¬1y36Mhz
  ADC_CommonInit(&ADC_CommonInitStructure);//3õê¼»ˉ
       
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;//12λÄ￡ê½
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;//·Çé¨ÃèÄ￡ê½       
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;//1رÕá¬Dø×a»»
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;//½ûÖ1′￥·￠¼ì2a￡¬ê1óÃèí¼t′￥·￠
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//óò¶ÔÆë       
  ADC_InitStructure.ADC_NbrOfConversion = 1;//1¸ö×a»»Ôú1æÔòDòáDÖD ò2¾íêÇÖ»×a»»1æÔòDòáD1
  ADC_Init(ADC1, &ADC_InitStructure);//ADC3õê¼»ˉ
       

        ADC_Cmd(ADC1, ENABLE);//¿aÆôAD×a»»Æ÷       

        //ADCÄ￡Äa¿′ÃÅ1·ÖD¶Ïê1Äü
       
        ADC_AnalogWatchdogSingleChannelConfig(ADC1,ADC_Channel_10);//¶Ôμ￥¸öADC í¨μàéèÖÃÄ￡Äa¿′ÃÅ1·
       
        ADC_AnalogWatchdogThresholdsConfig(ADC1, 0x7FF, 0x064);//+éèÖøßμíãDÖμ￡¿
       
       
        ADC_AnalogWatchdogCmd(ADC1,ADC_AnalogWatchdog_SingleRegEnable);//ê1ÄüÄ￡Äa¿′ÃÅ1·
        //+++++
       
        NVIC_InitStucture.NVIC_IRQChannel=ADC_IRQn;
        NVIC_InitStucture.NVIC_IRQChannelPreemptionPriority=2;//ÇàÕ¼óÅÏ輶
        NVIC_InitStucture.NVIC_IRQChannelSubPriority=0;//Ïìó|óÅÏ輶
        NVIC_InitStucture.NVIC_IRQChannelCmd=ENABLE;
        NVIC_Init(&NVIC_InitStucture);
       
       
        ADC_ITConfig(ADC1,ADC_IT_AWD,ENABLE);
}                       


void ADC_IRQHandler()
{

         if(ADC_GetITStatus(ADC1,ADC_IT_AWD)==SET)//+Îaé¶2»êÇADC_GetITStatus￡¿òѽa¾ö￡¬μ«êÇÕa¸ö×÷óÃêÇê2Ã′￡¿
         {
                ADC_ClearFlag(ADC1,ADC_FLAG_AWD);
       
                LED0=!LED0;
                delay_ms(250);       
                ADC_ClearITPendingBit(ADC1,ADC_IT_AWD);       
         }
}