为什么我的外部中断只有中断2有用

只看该作者 · 2018-7-15 18:12

#include &quot;stm32f4xx.h&quot;
#include &quot;exti.h&quot;
#include &quot;key.h&quot;
#include &quot;delay.h&quot;
#include &quot;led.h&quot;
#include &quot;beep.h&quot;
#include &quot;stdio.h&quot;

void EXTI0_IRQHandler(void)
{
      printf(&quot;EXTI0 coming!
&quot;);
      if(WK_UP == 1)
      {
            BEEP = !BEEP;
      }
      EXTI_ClearITPendingBit(EXTI_Line0);
}
void EXTI2_IRQHandler(void)
{
      printf(&quot;EXTI2 coming!
&quot;);
      if(KEY2 == 0)
      {
            LED0 = !LED0;
      }
      EXTI_ClearITPendingBit(EXTI_Line2);
}
void EXTI3_IRQHandler(void)
{
      printf(&quot;EXTI3 coming!
&quot;);
      if(KEY1 == 0)
      {
            LED1 = !LED1;
      }
      EXTI_ClearITPendingBit(EXTI_Line3);
}
void EXTI4_IRQHandler(void)
{
      printf(&quot;EXTI4 coming!
&quot;);
      if(KEY0 == 0)
      {
            LED0 = !LED0;
            LED1 = !LED1;
      }
      EXTI_ClearITPendingBit(EXTI_Line4);
}
void Exti_Init(void)
{
      EXTI_InitTypeDef EXTI_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      KEY_Init();                                                                                                             //按键初始化
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG,ENABLE);                      //使能SYSCFG时钟

      SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE,EXTI_PinSource2);       //PE2连接中断线2
      SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE,EXTI_PinSource3);       //PE3连接中断线3
      SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE,EXTI_PinSource4);       //PE4连接中断线4
      SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA,EXTI_PinSource0);       //PA0连接中断线0

      EXTI_InitStructure.EXTI_Line = EXTI_Line0;
      EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;                               //中断
      EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;                      //上升沿触发
      EXTI_InitStructure.EXTI_LineCmd = ENABLE;
      EXTI_Init(&EXTI_InitStructure);

      EXTI_InitStructure.EXTI_Line = EXTI_Line2 |EXTI_Line3 | EXTI_Line4;
      EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;                               //中断
      EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;                      //下降沿触发
      EXTI_InitStructure.EXTI_LineCmd = ENABLE;                                              //使能
      EXTI_Init(&EXTI_InitStructure);

      NVIC_InitStructure.NVIC_IRQChannel = EXTI_Line0;                               //外部中断0
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0X00;       //抢占优先级0
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0X02;                      //响应优先级2
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      NVIC_InitStructure.NVIC_IRQChannel = EXTI_Line2;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0X03;       //抢占优先级3
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0X02;                      //响应优先级2
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      NVIC_InitStructure.NVIC_IRQChannel = EXTI_Line3;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0X02;       //抢占优先级2
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0X02;                      //响应优先级2
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      NVIC_InitStructure.NVIC_IRQChannel = EXTI_Line4;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0X01;       //抢占优先级1
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0X02;                      //响应优先级2
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);
}

为什么我的外部中断只有中断2有用

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