原创 STM32----4----EXTI

 2011-5-9 10:32  3042 3 3 分类: MCU/ 嵌入式

外部中断配置的目标是：PA15、PA13、PA0为按键，PA8，PD0为LED，按键进入中断，相应的LED亮灭。

void EXTI_Configuration()
{

  EXTI_InitTypeDef EXTI_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

       //清空中断标志
       EXTI_ClearITPendingBit(EXTI_Line13);
       EXTI_ClearITPendingBit(EXTI_Line15);
       EXTI_ClearITPendingBit(EXTI_Line0);
    //(1)管脚配置
    LED_Init();
    KEY_Init();
    //(2)外部中断线配置，选择中断线管脚PA13、PA15、PA0
       GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource13);
       GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource15);
       GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);

     //(3)对中断线进行中断设置
       EXTI_InitStructure.EXTI_Line = EXTI_Line13 | EXTI_Line15 ; //选择中断线路PA13/15
       EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //设置为中断请求，非事件请求
       EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling ; //设置中断触发方式为上下降沿触发
       EXTI_InitStructure.EXTI_LineCmd = ENABLE;                     //外部中断使能
       EXTI_Init(&EXTI_InitStructure);        //初始化中断

       EXTI_InitStructure.EXTI_Line = EXTI_Line0; //选择中断线路PA0
       EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //设置为中断请求，非事件请求
       EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising ; //设置中断触发方式为上下降沿触发
       EXTI_InitStructure.EXTI_LineCmd = ENABLE;                     //外部中断线使能
       EXTI_Init(&EXTI_InitStructure);

   //EXTI_GenerateSWInterrupt(EXTI_Line0| EXTI_Line13 | EXTI_Line15 ); //中断线使能、中断结构体初始化、以及设置软中断综合起来才启用了中断
   //(4)NVIC配置
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);                          //选择中断分组2
  NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQChannel;     //选择中断通道2
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占式中断优先级设置为0
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;        //响应式中断优先级设置为0
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;           //使能中断
        NVIC_Init(&NVIC_InitStructure);
    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQChannel;     //选择中断通道2
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占式中断优先级设置为0
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;        //响应式中断优先级设置为0
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;           //使能中断
        NVIC_Init(&NVIC_InitStructure);

}

void LED_Init( )
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;//选择PA.8
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //管脚频率为50MHZ
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //模式为推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化GPIOA寄存器
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;//选择PX.2
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//管脚频率为50MHZ
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;//设置推挽输出
GPIO_Init(GPIOD , &GPIO_InitStructure);//初始化GPIOD寄存器

GPIO_WriteBit(GPIOA,GPIO_Pin_8,Bit_SET);
GPIO_WriteBit(GPIOD,GPIO_Pin_2,Bit_SET);
}

void KEY_Init()
{
/*PA13、PA15管口引脚的配置**下拉输入******************************/
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_13|GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/*PA0管口引脚的配置**上拉输入************************************/
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPD;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

}

void EXTI15_10_IRQHandler(void)

{

delay_ms(10);

if(EXTI_GetITStatus(EXTI_Line15)==RESET)

{

if((GPIO_ReadOutputDataBit(GPIOD,GPIO_Pin_2)==0) )

LED1_Off();

else

LED1_On();

}

else if(EXTI_GetITStatus(EXTI_Line13)==RESET)