STM32GPIO复用为外部中断及中断功能测试.docVIP

GPIO端口复用为外部中断信号输入端，控制PA1端口电平变化，使用MDK E_inter.c 代码如下，其它使用keil自带的文件 #include stm32f10x_lib.h void RCC_cfg() //时钟设置 { //打开PA端口时钟，由于GPIO用作中断输入，属于端口复用，故也需要打开复用时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); } void NVIC_cfg() //设置中断 { NVIC_InitTypeDef NVIC_InitStructure; //定义结构体变量 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //选择中断分组2，3个中断源，需2bit进行优先级设置 //高两位用于设置抢占式 优先级； //低两位用于设置响应式 优先级 NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQChannel; //选择中断通道2 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占式中断优先级设置为0 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应式中断优先级设置为0 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能中断 NVIC_Init(NVIC_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQChannel; //选择中断通道3 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占式中断优先级设置为0 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应式中断优先级设置为0 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能中断 NVIC_Init(NVIC_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel; //选择中断通道5 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占式中断优先级设置为0 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应式中断优先级设置为0 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能中断 NVIC_Init(NVIC_InitStructure); } void IO_cfg() //GPIO初始化 { GPIO_InitTypeDef GPIO_InitStructure; //定义结构体变量 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //选择使用的引脚 PA1做led指示 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //设置端口翻转速度 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //设置端口工作模式 推挽输出 GPIO_Init(GPIOA,GPIO_InitStructure); //初始化PA.1引脚 GPIO_ResetBits(GPIOA,GPIO_Pin_1); //将PA.1引脚设置为低电平输出，LED灯