time0._c

AVR基本外设测试程序

#include"sga.h" 
/*=============定时器0中断函数==============*/
 #pragma interrupt_handler timet0_ovf:10
  void timet0_ovf(void)               
  {
   	  static unsigned int 
	  		 BEEP1_CONT=110,
			 BEEP2_CONT=190,
	  		 M05_CONT=800;  
   	    SREG =0X80;	 //重新开放中断
  	    TCNT0=0XEE;   //重装1.25MS的定时初值
		DDRB|=BIT(PB0);
		PORTB|=BIT(PB0);                       
	    M05_CONT--;
	    if(M05_CONT==0)
	    {
	       M05_CONT=800;
		   if(MBZ==0)   { MBZ=1; }
		   else         { MBZ=0; }
	    }
		if(BIT_80&0x80==0x80)
		{
		 	BUZZ_NO;
		    if((BEEP1_CONT--)==1)
	          {
 	           BEEP1_CONT=110;
	           BUZZ_YE;
	           BIT_80&=0x7f;//a.BEEP1=0;
	          }
		}
/*==========响铃2次函数设置============*/	
			if(BIT_80&0x40==0x40)		//响铃2次beep2
	{
		--BEEP2_CONT;
		if(BEEP2_CONT>113)
		{
			BUZZ_NO;
		}else
		if(BEEP2_CONT>75)
		{
			BUZZ_YE;
		}else
		if(BEEP2_CONT>0)
		{
			BUZZ_NO;
		}else
		if(BEEP2_CONT==0)
		{
			BUZZ_YE;
			BIT_80&=0xbf;
			BEEP2_CONT=190;
		}
	}
/*==========响铃2次函数结束============*/		
		
  }