求助中断进不去！

hyl88099 · 发表于 2018-7-9 14:27:38

以下是我写的中断函数，可是中断就是进不去，debug下EXTI的各个寄存器也都是0，请大神求助RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOC | RCC_AHBPeriph_GPIOD| RCC_AHBPeriph_GPIOF, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

GPIO_CFG( 38 , _IN_IO , P_UP);  //按键配置包含在这里面，无问题，按键时寄存器的值能正常改变

EXTI_InitTypeDef EXTI_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource7);
      EXTI_InitStructure.EXTI_Line = EXTI_Line7;
      EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
      EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
      EXTI_InitStructure.EXTI_LineCmd = ENABLE;
      EXTI_Init(&EXTI_InitStructure);

            NVIC_InitStructure.NVIC_IRQChannel = EXTI4_15_IRQn;
            NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

void EXTI4_15_IRQHandler(void)
{
      int i,j;
      if(EXTI_GetITStatus(EXTI_Line7)==SET)
      {
            delay_us(10000);
            EXTI_ClearITPendingBit(EXTI_Line7);
            for(j=0;j<500;j++)
            {
            for(i=0;i<2;i++)
                     {
                              if(i==0)
                                    DAC_Control_forward();
                              else
                                    DAC_Control_reverse();
                                 DAC_SPEED(0);
                              delay_us(10000);
         }
   }
}
}
      中断函数一直不能执行，请大神们看看是不是中断配置的那个位置出了问题