STM32外部中断.

void EXTIX_Init(void)
{
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource1);   //A1
    EXTI_InitStructure.EXTI_Line=EXTI_Line1;   //这个Line跟GPIO引脚有关, 如果是引脚1, 就用Line1
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;     //下降沿触发, 因为红外的模块就是走的下降
    EXTI_Init(&EXTI_InitStructure);        
    
    NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;            
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;    
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03;                    
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                                
    NVIC_Init(&NVIC_InitStructure);
}

void EXTI1_IRQHandler(void)
{

    LED_ONOFF(ON);    
    delay_s(2);
    LED_ONOFF(OFF);
    EXTI_ClearITPendingBit(EXTI_Line1);
}

void GPIOA1_Init(void){

    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
    GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;   //下拉输入
    GPIO_Init(GPIOA, &GPIO_InitStructure);
}