STM32F030控制蜂鸣器

（1）main()函数中：

int BeeTime=0;
int soundSta=0;

void main()
{
	TIM2_Init()；
	soundBee(1);//长响一声
	soundBee(0);//短响一声

}

void TIM2_Init() 
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = (TIM_CLK / 200000) - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 1999;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
    TIM_SetAutoreload(TIM2, ((TIM_CLK / 200000) - 1));


    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE); // 打开捕获比较中断 TIM_IT_Update
    TIM_Cmd(TIM2, ENABLE); //开启时钟
}

/***********************
  功能：蜂鸣器启动
  sta：1为成功，0为失败
***********************/
void soundBee(int sta) 
{
    DOOR_PWR1(1);
    if(sta==1)
    {
      soundSta=0;
      BeeTime = 80;
    }else{
      soundSta=1;
      BeeTime = 20;
    }    
}

（2）hardware_conf.h函数中：

#define DOOR_PWR1(tmp)       GPIOA->ODR=tmp?(GPIOA->ODR|1<<1):(GPIOA->ODR&(~(1<<1))) //蜂鸣器

（3）stm32f10x_it.c函数中：

extern int BeeTime;

void TIM2_IRQHandler(void)  
{  
  if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
  {
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

    if(BeeTime<0)
    {
      BeeTime++;
      if(BeeTime==0)
      {
        DOOR_PWR1(1);
        BeeTime=20;
      }
    }
    if(BeeTime>0||soundSta==2)
    {
      if(BeeTime>0) BeeTime--;
      if(BeeTime==0)
      {
        if(soundSta==0)
        {
          DOOR_PWR1(0); 
        }
        else if(soundSta==1)
        {
          DOOR_PWR1(0);
          BeeTime=-10;
          soundSta=2;
        }
        else
        {
          DOOR_PWR1(0);
          soundSta=0;
        }
      }
    }

  }
  else  if (TIM_GetITStatus(TIM2,  TIM_IT_CC1) != RESET)
  {
    TIM_ClearITPendingBit(TIM2, TIM_IT_CC1); 
  }  
}