STM32的外部中断配置及使用

STM32的外部中断配置及使用

配置1：GPIO；

配置外部中断为输入模式；

配置2：EXTI；

配置外部中断线和触发模式；

配置3：NVIC；

配置外部中断源和中断优先级；

需要注意的是：RCC_APB2Periph_AFIO 时钟必须打开，容易忽略的一点；

 void EXTI_PORTC_CONFIG(void)
 {
         GPIO_InitTypeDef GPIO_InitStructure;
         EXTI_InitTypeDef EXTI_InitStructure;
         NVIC_InitTypeDef NVIC_InitStructure;

         RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO,ENABLE);

         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU ; //内部上拉
         GPIO_Init(GPIOC, &GPIO_InitStructure);

         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU ; //内部上拉
         GPIO_Init(GPIOC, &GPIO_InitStructure);

         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU ; //内部上拉
         GPIO_Init(GPIOC, &GPIO_InitStructure);

         GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource2);
         GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource3);
         GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource5);

         EXTI_InitStructure.EXTI_Line = EXTI_Line2;
         EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
         EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
         EXTI_InitStructure.EXTI_LineCmd = ENABLE;
         EXTI_Init(&EXTI_InitStructure);

         EXTI_InitStructure.EXTI_Line = EXTI_Line3;
         EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
         EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
         EXTI_InitStructure.EXTI_LineCmd = ENABLE;
         EXTI_Init(&EXTI_InitStructure);

         EXTI_InitStructure.EXTI_Line = EXTI_Line5;
         EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
         EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
         EXTI_InitStructure.EXTI_LineCmd = ENABLE;
         EXTI_Init(&EXTI_InitStructure);

         NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;
         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ;
         NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;
         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
         NVIC_Init(&NVIC_InitStructure);

         NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ;
         NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;
         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
         NVIC_Init(&NVIC_InitStructure);

         NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ;
         NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;
         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
         NVIC_Init(&NVIC_InitStructure);
 }