曝光定时器.c

51单片机写的曝光定时器

#include "at89x52.h"
#include "intrins.h"                            //_nop_();延时函数用

#define  uchar unsigned char
#define  uint  unsigned int


uchar code discode[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
//共阳LED段码表        "0"  "1"  "2"  "3"  "4"  "5"  "6"  "7"  "8"  "9" 
uint disdata[2]={0,0};          

/*********************延迟1ms**********************/

void delayms(uint ms)	
// 延时子程序
{						
	unsigned char i;
	while(ms--)
	{
		for(i = 0; i <105; i++);
	}
}

/********************显示函数*********************/

void scan(uint time)
{ 	  uint t,s;
if(time>=10)t=time/10 ;else t=0;
s=time-t*10;
   disdata[0]=t;
   disdata[1]=s; 
P3=0xff;
P3_6=0;
P0=discode[disdata[0]];
delayms(5);
P3=0xff;
P3_7=0;
P0=discode[disdata[1]];
delayms(5);
P3=0xff;
}
/*******************显示+延迟0.1秒************************/

 void delay_scan(uint t,uint codes)
 { 	  t=t*10;
  while(t--){
    scan(codes);	
   }
  
 }


/*********************声音函数**********************/

void beep(uint t,uint s)	
			   
{	if(s==0)s=360;
    else if(s==1) s=90;
	else if(s==2) s=30;
	else s=300;		
	while(t--)
	{
		P2_1=0	;
		delayms(s);
		P2_1=1;
		delayms(s);
	}
	delayms(s/6);
	
}
/****************主函数************************/
main()
{ 
uint time=0;
P1=0xFF;


while(1)
{
scan(time);

if(P1_0==0){
delayms(5);
if(P1_0==0){
if(time<60) time++;else beep(1,1);
scan(time);
delay_scan(1,time);
}
}
//----
if(P1_1==0){
delayms(5);
if(P1_1==0){
if(time>0) time--;else beep(1,1);
scan(time);
delay_scan(1,time);
}
}
//----
 if(P1_2==0)
 {
    delayms(5);
    if(P1_2==0 && time>0)
	{ P2_0=1;
	  delay_scan(3,time);
      while(time--)
      { beep(1,2);
        P2_0=0;
	  delay_scan(10,time);
	  
		
	  }
	   P2_0=1;
       beep(1,1);
       time=0;
    }
	else 
	beep(1,0);
    time=0;
 }
 //----
if(P1_3==0){
delay_scan(7,time);
if(P1_3==0){
beep(2,1);
P2_0=~P2_0;
delay_scan(10,time);
}
}

}
}



/***********************结束**************************/