请原子帮忙看一下，外部中断5进不了中断

kelly_li · 发表于 2014-7-31 10:36:25

请帮我看一下有哪里不对，PE5设置下降沿进入中断，示波器检测到下降沿，但就是进不了中断，怎么回事？
void Init(void)
{

    GPIO_InitTypeDef GPIO_InitStructure;
  EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE, ENABLE); //使能PE端口时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //使能复用功能时钟

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //上拉输入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度为50MHz
GPIO_Init(GPIOE, &GPIO_InitStructure);
GPIO_SetBits(GPIOE,GPIO_Pin_5);

    //GPIOE.5 中断线以及中断初始化配置下降沿触发
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource5);
EXTI_InitStructure.EXTI_Line=EXTI_Line5;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_Init(&EXTI_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; //使能channel_5所在的外部中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢占优先级preemption = 2
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //子优先级 sub-priority = 0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外部中断通道
NVIC_Init(&NVIC_InitStructure);

}

//外部中断5
void EXTI9_5IRQHandler(void)
{
pay_count[5]++;
    EXTI_ClearITPendingBit(EXTI_Line5); //清除LINE5上的中断标志位
}

以上代码有下降沿pay_count[5]加一，PE5端口检测到下降沿，但pay_count[5]没变化。请大家帮忙看下，谢谢！