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一、初始化该引脚时钟

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB ，ENABLE);

二、初始化该引脚为外部中断

void GPIO_Config_Init(void)

{

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //PB8 dog_wake

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOB, GPIO_InitStructure);

}

三、初始化外部中断函数

void EXTI_Config_Init(void)

{

EXTI_InitTypeDef EXTI_InitStructure;

EXTI_ClearITPendingBit(EXTI_Line8);//

GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource8);//

EXTI_InitStructure.EXTI_Line=EXTI_Line8; //

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //

EXTI_InitStructure.EXTI_LineCmd = ENABLE;//

EXTI_Init(EXTI_InitStructure);

}

四、初始化中断向量表

void NVIC_Config_Init(void)

{

NVIC_InitStructure.NVIC_IRQChannel =EXTI9_5_IRQn;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;//ÇÀÕ¼ÓÅÏȼ¶

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;//×ÓÓÅÏȼ¶

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//ʹÄÜÍⲿÖжÏͨµÀ

NVIC_Init(NVIC_InitStructure);

}

五、编写外部中断函数

void EXTI9_5_IRQHandler(void)

{

if (EXTI_GetITStatus(EXTI_Line8) != RESET)

{

EXTI_ClearITPendingBit(EXTI_Line8); //

GPIO_SetBits(GPIOB,GPIO_Pin_9);

delay_ms(10);

GPIO_ResetBits(GPIOB,GPIO_Pin_9);

}

}

关键词： stm32 外部PB8中断