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；

 

1 void EXTI_PORTC_CONFIG(void) 2 { 3         GPIO_InitTypeDef GPIO_InitStructure; 4         EXTI_InitTypeDef EXTI_InitStructure; 5         NVIC_InitTypeDef NVIC_InitStructure; 6  7         RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO,ENABLE); 8  9         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;10         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU ; //内部上拉11         GPIO_Init(GPIOC, &GPIO_InitStructure);12     13         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;14         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU ; //内部上拉15         GPIO_Init(GPIOC, &GPIO_InitStructure);16     17         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;18         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU ; //内部上拉19         GPIO_Init(GPIOC, &GPIO_InitStructure);20 21         GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource2);22         GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource3);23         GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource5);24 25         EXTI_InitStructure.EXTI_Line = EXTI_Line2; 26         EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;27         EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;28         EXTI_InitStructure.EXTI_LineCmd = ENABLE;29         EXTI_Init(&EXTI_InitStructure);30         31         EXTI_InitStructure.EXTI_Line = EXTI_Line3; 32         EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;33         EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;34         EXTI_InitStructure.EXTI_LineCmd = ENABLE;35         EXTI_Init(&EXTI_InitStructure);36         37         EXTI_InitStructure.EXTI_Line = EXTI_Line5; 38         EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;39         EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;40         EXTI_InitStructure.EXTI_LineCmd = ENABLE;41         EXTI_Init(&EXTI_InitStructure);42 43         NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;44         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;45         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;46         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;47         NVIC_Init(&NVIC_InitStructure);48         49         NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;50         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;51         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;52         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;53         NVIC_Init(&NVIC_InitStructure);54         55         NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;56         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;57         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;58         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;59         NVIC_Init(&NVIC_InitStructure);60 }