STM32与MQ2的使用问题

2万 · 2021-6-7 23:29

void Mq2_Init(void)
{
   GPIO_InitTypeDef GPIO_InitStruct;
   EXTI_InitTypeDef EXTI_InitStruct;
   NVIC_InitTypeDef NVIC_InitStruct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource2);

GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IPD;
GPIO_InitStruct.GPIO_Pin=GPIO_Pin_2;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOC,&GPIO_InitStruct);
GPIO_SetBits(GPIOB,GPIO_Pin_2);

NVIC_InitStruct.NVIC_IRQChannel=TIM2_IRQn;
NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=2;
NVIC_InitStruct.NVIC_IRQChannelSubPriority=2;
NVIC_Init(&NVIC_InitStruct);

EXTI_ClearITPendingBit(EXTI_Line2);
EXTI_InitStruct.EXTI_Line=EXTI_Line2;
EXTI_InitStruct.EXTI_LineCmd=ENABLE;
EXTI_InitStruct.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStruct.EXTI_Trigger=EXTI_Trigger_Falling;
EXTI_Init(&EXTI_InitStruct);

}

void EXTI2_IRQHandler(void)
{

delay_ms(10);

PCout(2)=0;

LED0=!LED0;
delay_ms(500);
LED0=!LED0;
printf("dangerous\r\n");

EXTI_ClearITPendingBit(EXTI_Line2);

}

MQ2是正常工作的，STM32为什么没有反应呢？