为什么这样做LED不能翻转

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电梯直达

楼主

怎么叫都可以|

楼主 | 2018-6-7 11:54 | 只看该作者回帖奖励

|倒序浏览 |阅读模式

LED, IO, pi, gp, GPIO

#include &quot;stm32f10x.h&quot;

uint8_t flag=0;

void EXTI_Config(void)

{

      GPIO_InitTypeDef       GPIO_InitStructure;

      EXTI_InitTypeDef       EXTI_InitStructure;

      NVIC_InitTypeDef       NVIC_InitStructure;



      RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB,ENABLE);

      GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;

      GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;

      GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;



      GPIO_Init(GPIOB,&GPIO_InitStructure);



      GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;

      GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;



      GPIO_Init(GPIOA,&GPIO_InitStructure);



      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);



      NVIC_InitStructure.NVIC_IRQChannel=EXTI0_IRQn;

      NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;



      NVIC_Init(&NVIC_InitStructure);





      GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0);



      EXTI_InitStructure.EXTI_Line=EXTI_Line0;

      EXTI_InitStructure.EXTI_LineCmd=ENABLE;

      EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;

      EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;



      EXTI_Init(&EXTI_InitStructure);

}

int main(void)

{

      EXTI_Config();



      while(flag)

      {

            flag=0;

            GPIOB->ODR^=1ul;

      }

}

void EXTI0_IRQHandler(void)

{

            if(EXTI_GetITStatus(EXTI_Line0)==SET)

            {

                     flag=1;

            //       GPIOB->ODR^=1ul;

                     EXTI_ClearITPendingBit(EXTI_Line0);

            }

}

如果直接在中断函数里面翻转LED就能行的.

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为什么这样做LED不能翻转

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