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？ |
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