怎么就是进不了外部中断，搜了帖子看也不知道问题。

只看该作者 · 2013-7-19 16:21

void GPIO_init(void)
{
GPIO_InitTypeDef  GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE );

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
--------------------------------------------------------------------------------------------------------------------------
void EXTIX_Init(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC,GPIO_PinSource9);

EXTI_InitStructure.EXTI_Line=EXTI_Line9;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;       NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;       NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;       NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}
-------------------------------------------------------------------------------------------------------------
void EXTI9_5_IRQHandler(void)
{
            static u8 KeyStatue=0;

if(EXTI_GetITStatus(EXTI_Line9)!=RESET)
{
if(!KeyStatue)
{
GPIO_ResetBits(GPIOD,GPIO_Pin_2);
KeyStatue=1;
}
else
{
GPIO_SetBits(GPIOD,GPIO_Pin_2);
KeyStatue=0;
}

EXTI_ClearITPendingBit(EXTI_Line9); //清除LINE0上的中断标志位
}

}

我的按键是按下的时候是低电平。