使用EXTI要先设置NVIC;
void NVIC_Configuration() { NVIC_InitTypeDef NVIC_InitStructure; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);//选择中断优先级分组 NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;//设置0管脚为 中断管脚 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//设置先占式优先级 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;//设置从占式优先级 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能 NVIC_Init(&NVIC_InitStructure); } 接着设置EXTI 这里我选择使用EXTI0 void EXTI_Configuration() { EXTI_InitTypeDef EXTI_InitStructure; EXTI_DeInit(); //将EXTI 设置为默认值 GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0); //选择A0为中断管脚 EXTI_InitStructure.EXTI_Line = EXTI_Line0; //选择0通道 EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //选择为中断 EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //设置沿下降沿中断 EXTI_InitStructure.EXTI_LineCmd = ENABLE; //使能 EXTI_Init(&EXTI_InitStructure); } 注意完成一次中断后要把中断标准位 清空 使用EXTI_ClearITPendingBit(EXTI_Line0); 而且还要把 复用时钟打开 使用 RCC_APB2PeriohClockCmd(RCC_APB2Periph_AFIO,ENABLE);
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