runbuzzer.c

来自「采用430单片机完成的门禁控制器程序」· C语言 代码 · 共 36 行

//------------------------------------------------------------------------------
//蜂鸣器驱动程序
//------------------------------------------------------------------------------
void RUNBUZZER()
{
  uchar i;
  if(FLAG&gb_buzzer)
  {
    buzzer_cnt++;
    if(buzzer_cnt<30)
    {
      i=buzzer_cnt<<1;
      if(i<30)
      {
        P6OUT |=BUZ;
      }
      if(i>30)
      {
        P6OUT &=~BUZ;
      }
    }
    else if(buzzer_cnt >= 30)
    {
      buzzer_cnt =0;
      if(buzzer_cycle>1)
      {
        buzzer_cycle--;
      }
      else
      {
        FLAG &=~gb_buzzer;
      }
    }
  }
}