stm32中断

作者: 清亮2015 | 来源:发表于2018-08-31 20:37 被阅读0次

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初始化中断


void NVIC_cfg(void)
{
  EXTI_InitTypeDef   EXTI_InitStructure;
  GPIO_InitTypeDef   GPIO_InitStructure;
  NVIC_InitTypeDef   NVIC_InitStructure;
    GPIO_InitTypeDef   GPIO_InitStructure1;

    
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA|RCC_AHB1Periph_GPIOE, ENABLE);
    //RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);
  /* Enable SYSCFG clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
  
  /* Configure PA0 pin as input floating */
  
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
    
  GPIO_InitStructure1.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure1.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure1.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4;
  GPIO_Init(GPIOE, &GPIO_InitStructure1);
    
    
    
    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);
    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE, EXTI_PinSource2);
    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE, EXTI_PinSource3);
    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE, EXTI_PinSource4);
    
  

  EXTI_InitStructure.EXTI_Line = EXTI_Line0;//设置外部中断线
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;// 设置为外部中断
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  // 设置触发方式
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;// 使能
  EXTI_Init(&EXTI_InitStructure);  
    
  EXTI_InitStructure.EXTI_Line = EXTI_Line2;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);  
    
  EXTI_InitStructure.EXTI_Line = EXTI_Line3;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);  
    
  EXTI_InitStructure.EXTI_Line = EXTI_Line4;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);  
    

  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn; //设置中断通道
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;//设置抢占优先级
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;// 设置响应优先级
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//  使能
  NVIC_Init(&NVIC_InitStructure);
    
  NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
    
  NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

这里设置的是四个按键的中断，
1、先定义结构体、在初始化时钟。
2、在设置串口为输入模式。
3、配置EXIT中断线。
4、配置中断控制器NVIC。
5、写中断服务子程序。

中断服务程序

实现功能是点灯

void EXTI0_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line0) == SET) // 如果产生了中断
    {
        PFout(9) = ~PFout(9);
    }
    
    EXTI_ClearITPendingBit(EXTI_Line0);
}