//晶振11.0592
//燈光在單片機(jī)控制之下完成由亮到暗的逐漸變化，感覺(jué)像是在呼吸
//本例在51hei-5型開(kāi)發(fā)板上實(shí)現(xiàn)了一個(gè)數(shù)碼管和一個(gè)led燈一起實(shí)現(xiàn)呼吸效果
//文件下載:http://m.zg4o1577.cn/f/fxd.rar
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char

sbit D1=P0^7;

uchar sr;
uchar jf;

uchar code table[]={
0,1,2,3,4,5,6,7,8,9,10,
11,12,13,14,15,16,17,18,
19,20,21,22,23,24,25,26,27,
28,29,30,31,32,33,34,35,36,
37,38,39,40,41,42,43,44,45,
46,47,48,49};

void light(uchar num);
void delay(uint z);

void main()
{
//設(shè)置計(jì)數(shù)器
//選取計(jì)數(shù)方式1
 TMOD = 0x11;
//給計(jì)數(shù)器寫(xiě)初值
 TH0 = 0;
 TL0 = 0;
////////////////////
//操作單片機(jī)
//開(kāi)啟CPU中斷
 EA = 1;
///////////////////
//開(kāi)啟定時(shí)器T0位中斷
 ET0 = 1;
//開(kāi)啟計(jì)數(shù)器
 TR0 = 1;
//操作二極管
P1=0;
 while(1)
 {
  if(sr<50)
   light(sr);
  else sr=0;
 }
}
//子函數(shù)
void light(uchar num)
{
 uchar tme;
 D1 = 0;
 tme = table[num];
 delay(tme);
 D1 = 1;
 delay(49-tme);
}
//中斷函數(shù)
void time () interrupt 1
{
//自變量自加
 if (jf<2)
  {
   jf++;
   TH0 =0;
   TL0 = 0;
  }
 
 if (jf==2)
  {
//寫(xiě)初值
   jf=0;
   
   TH0 = 254;
   TL0 = 254;
   sr++;
  } 
}
void delay(uint z)
{
 uint x,y;
 for(x=10;x>0;x--)
  for(y=z;y>0;y--);
}

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