1、初始化代码

  1. #include "bsp_exti.h"
  3. /*
  4.     EXTI_Mode_Interrupt = 0x00,
  5.     EXTI_Mode_Event = 0x04
  6. */
  8. /*
  9.     EXTI_Trigger_Rising = 0x08,
  10.     EXTI_Trigger_Falling = 0x0C,  
  11.     EXTI_Trigger_Rising_Falling = 0x10
  12. */
  14. void BSP_EXTI_INIT()
  15. {
  16.     //打开时钟
  17.     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);
  18.     RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//使能SYSCFG时钟
  19.     //引脚初始化
  20.     {
  21.         GPIO_InitTypeDef GPIO_InitStruct;
  23.         GPIO_InitStruct.GPIO_Pin  = GPIO_Pin_2;
  24.         GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
  25.         GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
  27.         GPIO_Init(GPIOB,&GPIO_InitStruct);
  28.     }
  29.     //外部中断初始化
  30.     {
  31.         EXTI_InitTypeDef   EXTI_InitStructure;
  33.         EXTI_InitStructure.EXTI_Line = EXTI_Line2;//LINE2
  34.         EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//中断事件
  35.         EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //上升沿触发 
  36.         EXTI_InitStructure.EXTI_LineCmd = ENABLE;//使能LINE2
  38.         EXTI_Init(&EXTI_InitStructure);//配置
  40.         SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource2);//PB2 连接到中断线2
  41.     }
  42.     //NVIC初始化
  43.     {
  44.         NVIC_InitTypeDef   NVIC_InitStructure;
  46.         NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;//外部中断2
  47.         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;//抢占优先级3
  48.         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  49.         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道
  51.         NVIC_Init(&NVIC_InitStructure);//配置
  52.     }
  53. }

2、使用代码

  1. void EXTI2_IRQHandler(void)
  2. {
  4.     EXTI_ClearITPendingBit(EXTI_Line2);//清除LINE2上的中断标志位 
  5. }