外部按键触发按键中断MCU直接卡死

Tim0213 · 发表于 2022-6-23 17:04:44

如题，选择STM32F407ZET6的PB5作为外部按键的输入，烧录程序后按下按键，程序直接卡死。
代码如下：
初始化部分
void EnCo_Init(){
/*定义初始化结构体*/
NVIC_InitTypeDef KEYNVICInitStructure;
EXTI_InitTypeDef KEYEXTIInitStructure;
GPIO_InitTypeDef GPIOInitStructure;
/*使能相关时钟*/
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG,ENABLE);//使能时钟
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB,EXTI_PinSource5);//链接PE2到外部中断线2

// PB5 设置为输入
GPIOInitStructure.GPIO_Pin=GPIO_Pin_5;
GPIOInitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIOInitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIOInitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉输入
GPIO_Init(GPIOB,&GPIOInitStructure);

//配置PB5外部中断线
KEYEXTIInitStructure.EXTI_Line = EXTI_Line5;
KEYEXTIInitStructure.EXTI_LineCmd=ENABLE;
KEYEXTIInitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
KEYEXTIInitStructure.EXTI_Trigger=EXTI_Trigger_Falling;//下降沿触发
EXTI_Init(&KEYEXTIInitStructure);

//PB5外部中断配置
KEYNVICInitStructure.NVIC_IRQChannel= EXTI9_5_IRQn;
KEYNVICInitStructure.NVIC_IRQChannelCmd= ENABLE;
KEYNVICInitStructure.NVIC_IRQChannelPreemptionPriority=0;
KEYNVICInitStructure.NVIC_IRQChannelSubPriority=1;
NVIC_Init(&KEYNVICInitStructure);
}
// PB5外部中断函数
void EXTI9_5_IRQnHandler(void){

if(EXTI_GetFlagStatus(EXTI_Line5)!=RESET){

EXTI_ClearITPendingBit(EXTI_Line5);//清除LINE5上的中断标志位
}
}

中断服务函数，增加延时软件消抖后，MCU仍然死机。