EEPW论坛

高级点的来了，Key作为外部中断，用中断方式检测Key是否按下。

首先配置下NVIC和EXTI，然后当检测到中断时点亮LED。

int main(void)
{
    NVIC_InitPara NVIC_InitStructure;
    EXTI_InitPara EXTI_InitStructure;
   
    /* Enable the GPIO_LED Clock */
    RCC_AHBPeriphClock_Enable( RCC_AHBPERIPH_GPIOA , ENABLE );
   
    //配置GPIO
    {
          GPIO_InitPara GPIO_InitStructure;
       
          /* Configure the GPIO_LED pin */
          GPIO_InitStructure.GPIO_Pin = GPIO_PIN_1;
          GPIO_InitStructure.GPIO_Mode = GPIO_MODE_OUT;
          GPIO_InitStructure.GPIO_OType = GPIO_OTYPE_PP;
          GPIO_InitStructure.GPIO_PuPd = GPIO_PUPD_NOPULL;
          GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_50MHZ;
          GPIO_Init( GPIOA , &GPIO_InitStructure );
         
          GPIO_InitStructure.GPIO_Pin = GPIO_PIN_0;
          GPIO_InitStructure.GPIO_Mode = GPIO_MODE_IN;
   
          GPIO_Init( GPIOA , &GPIO_InitStructure );
    }
   
    //配置NVIC
    {
        //使能NVIC时钟
        NVIC_PRIGroup_Enable( NVIC_PRIGROUP_1 );
       
        NVIC_InitStructure.NVIC_IRQ = EXTI0_1_IRQn ;
        NVIC_InitStructure.NVIC_IRQEnable = ENABLE;
        NVIC_InitStructure.NVIC_IRQPreemptPriority = 0;
        NVIC_InitStructure.NVIC_IRQSubPriority = 0;
        NVIC_Init(&NVIC_InitStructure);
    }
   
    //配置外部中断
    {
        //使能EXTI时钟
        RCC_APB2PeriphClock_Enable(RCC_APB2PERIPH_CFG, ENABLE);
        //将EXTI0连接到PA0（Key引脚）
        SYSCFG_EXTILine_Config(EXTI_SOURCE_GPIOA,EXTI_SOURCE_PIN0);
        EXTI_InitStructure.EXTI_LINE = EXTI_LINE0;
        EXTI_InitStructure.EXTI_LINEEnable =ENABLE;
        EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
        EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
        EXTI_Init(&EXTI_InitStructure);
    }
      while(1);
}

void EXTI0_1_IRQHandler(void)
{
    if(EXTI_GetINTBitState(EXTI_LINE0) != RESET)
    {
        EXTI_ClearINTBitState(EXTI_LINE0);
        GPIO_SetBits(GPIOA,GPIO_PIN_1);
    }
}