STM32外部中断测试

文博客链接:,作者:jdh,转载请注明.

环境：

主机:WIN7

开发环境:MDK4.23

MCU:STM32F103CBT6

说明:

STM32有20个外部中断线,其中EXTI0-EXTI15给I/O端口使用

EXTI线16连接到PVD输出 

源代码:

初始化:

//打开NTRX外部中断void open_ntrx_irq(void){ //定义中断结构体 NVIC_InitTypeDef NVIC_InitStructure ; //定义外部中断结构体 EXTI_InitTypeDef EXTI_InitStructure; //定义IO初始化结构体 GPIO_InitTypeDef GPIO_InitStructure;  //初始化NTRX中断脚PB1时钟 RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;       GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;       //设置为输入 GPIO_Init(GPIOB, &GPIO_InitStructure);                          //GPIOB初始化 //配置中断源为PB1 GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource1); // 配置EXTI_Line1下降沿触发 EXTI_ClearITPendingBit(EXTI_Line1); EXTI_InitStructure.EXTI_Line = EXTI_Line1; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); //打开NTRX中断 NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;    //通道设置为外部中断线0 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0f;  //中断占先等级0 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0f;           //中断响应优先级0 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;             //打开中断 NVIC_Init(&NVIC_InitStructure);                                 //初始化  //EXTI_Line1软件中断允许 //EXTI_GenerateSWInterrupt(EXTI_Line1);}

//NTRX中断void EXTI1_IRQHandler(void){ if(EXTI_GetITStatus(EXTI_Line1) != RESET)   {     //清中断     EXTI_ClearITPendingBit(EXTI_Line1);  //中断标志置位  Flag_IRQ.ntrx = 1;   }}