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我想使用PB8引腳作為中斷的輸入口，但是初始化后死活進(jìn)不去中斷，求大神們指教。
void PB8_IrDA_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure; // 定義一個(gè)EXTI結(jié)構(gòu)體變量
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOB, ENABLE); // 使能IO復(fù)用功能，使用中斷功能重要！！！
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //PB8為輸入口
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空輸入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //速度為50MHz
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;
GPIO_Init(GPIOB,&GPIO_InitStructure);
EXTI_ClearITPendingBit(EXTI_Line8);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource8); //PB8為中斷
EXTI_InitStructure.EXTI_Line = EXTI_Line8;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //中斷模式為外部中斷模式
EXTI_InitStructure.EXTI_Trigger = EXTI_TriggerFalling; //下降沿觸
EXTI_InitStructure.EXTI_LineCmd = ENABLE; //使能中斷線
EXTI_Init( &EXTI_InitStructure); //根據(jù)參數(shù)初始化中斷寄存器
//NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; //設(shè)定中斷源為PB8
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //中斷占優(yōu)先級為1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //副優(yōu)先級為3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能中斷
NVIC_Init( &NVIC_InitStructure); //根據(jù)參數(shù)初始化中斷寄存器
}
//
//
//
void EXTI9_5_IRQHandler(void) // IR引腳為PinB_8
{
if (RESET != EXTI_GetITStatus(EXTI_Line8) ) // 判斷是否發(fā)生中斷，發(fā)生則中斷標(biāo)志置1
{
IsEvnt_IrDA =TRUE;
EXTI_ClearITPendingBit(EXTI_Line8);
}
}
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