STM32的学习心得之外部中断/事件控制器(EXTI)

      外部中断配置也很简单，只需要打开相应的IO口配置，时钟，打开stm32f10x_conf.h里的 #include "stm32f10x_exti.h" ，配置EXIT和中断处理函数即可。下面是简单的实例(基于3.0库)：

  void GPIO_Configuration(void)//配置GPIOC_5口作为外部中断口
{

   GPIO_InitTypeDef  GPIO_InitStructure;
   GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
  GPIO_InitStructure.GPIO_Mode= GPIO_Mode_IN_FLOATING ;
  GPIO_Init(GPIOC, &GPIO_InitStructure); 

}

void EXTI_Configuration(void)
{
  EXTI_InitTypeDef EXTI_InitStructure;
  EXTI_InitStructure.EXTI_Line = EXTI_Line5; //外部中断线
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//中断模式
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;//中断触发方式
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;//打开中断
  EXTI_Init(&EXTI_InitStructure);
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource5); //选择 GPIO管脚用作外部中断线路

}

  void NVIC_Configuration(void)
{  
    NVIC_InitTypeDef NVIC_InitStructure;
 
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);    // 抢占式优先级别 

 NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;//指定中断源
 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; // 指定响应优先级别1
 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 NVIC_Init(&NVIC_InitStructure);

}

//中断处理函数

 void EXTI9_5_IRQHandler(void)
{

 if(EXTI_GetITStatus(EXTI_Line5) != RESET)
  {

//添加中断处理程序

   EXTI_CleaRFlag(EXTI_Line5);
    EXTI_ClearITPendingBit(EXTI_Line5);

}

}