外部中断怪异现象！！！

2019-07-20 07:35发布

本帖最后由无痕丶于 2018-6-14 14:34 编辑

这是一个关于外部中断的实验，实验会出现很奇怪的现象，附件里面有小视频。
我按键还没按下，手靠近按键，灯就自己亮了。

这是外部中断配置的代码。

#include "EXTI.h"
#include "LED.h"
#include "delay.h"
#include "stdio.h"

void EXTI_2_4_init(void)
{
      //配置PE4（KEY0）和PE2 （KEY2）为浮空输入
      RCC->APB2ENR |= (0x1<<6);
      //PE2
      GPIOE->CRL &= ~(0xf<<4*2);
      GPIOE->CRL |= (0x4<<4*2);
      //PE4
      GPIOE->CRL &= ~(0xf<<4*4);
      GPIOE->CRL |= (0x4<<4*4);

      //开启复用功能时钟
      RCC->APB2ENR |= (0x1<<0);
      //外部中断线2
      AFIO->EXTICR[0] &= ~(0xf<<4*2);
      AFIO->EXTICR[0] |= (0x4<<4*2);
      //外部中断线4
      AFIO->EXTICR[1] &= ~(0xf<<4*0);
      AFIO->EXTICR[1] |= (0x4<<4*0);

      //外部中断线2位下降沿触发
      EXTI->FTSR |= (0x1<<2);
      EXTI->RTSR &= ~(0x1<<2); //关闭上升沿触发
      //外部中断线4位下降沿触发
      EXTI->FTSR |= (0x1<<4);
      EXTI->RTSR &= ~(0x1<<4); //关闭上升沿触发

      //开启外部中断触发
      EXTI->IMR |= (0x1<<2);
      EXTI->IMR |= (0x1<<4);

      //配置NVIC
      NVIC_SetPriority(EXTI2_IRQn,NVIC_EncodePriority(NVIC_GetPriorityGrouping(),2,4));
      NVIC_SetPriority(EXTI4_IRQn,NVIC_EncodePriority(NVIC_GetPriorityGrouping(),2,3));
      NVIC_EnableIRQ(EXTI2_IRQn);
      NVIC_EnableIRQ(EXTI4_IRQn);

}

void EXTI2_IRQHandler()
{
      delay_init(72);
      delay_ms(10);
  if( EXTI->PR & (0x1<<2))
      {
            EXTI->PR |= (0x1<<2);
            LED1=!LED1;
         EXTI->PR |= (0x1<<2);
      }
}

void EXTI4_IRQHandler()
{
      delay_init(72);
      delay_ms(10);
  if( EXTI->PR & (0x1<<4))
      {
            EXTI->PR |= (0x1<<4);
            LED0=!LED0;
         EXTI->PR |= (0x1<<4);
      }
}
图片是按键连接图，用按键测试外部中断。

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