#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
#define DAC0832 P2 //½«DAC0832¶¨òåÎaP2¿ú;
#define ALL 65536 //½«ALL¶¨òåÎa65536;
#define Fosc 12000000 //ÆμÂêÎa12M
uchar TH_0,TL_0,flag1,flag=0;
uint FREQ=100,n; //Æeê¼ÆμÂêé趨Îa100HZ
float temp;
uchar code sz[]={
0,0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2,
2, 3, 3, 4, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9,
10, 10, 11, 12, 12, 13, 14, 15, 15, 16, 17, 18, 18, 19, 20, 21,
22, 23, 24, 25, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 36, 37,
38, 39, 40, 41, 42, 44, 45, 46, 47, 49, 50, 51, 52, 54, 55, 56,
57, 59, 60, 61, 63, 64, 66, 67, 68, 70, 71, 73, 74, 75, 77, 78,
80, 81, 83, 84, 86, 87, 89, 90, 92, 93, 95, 96, 98, 99, 101,102,
104, 106, 107, 109, 110, 112, 113, 115, 116, 118, 120, 121, 123, 124, 126, 128,
129, 131, 132, 134, 135, 137, 139, 140, 142, 143, 145, 146, 148, 149, 151, 153,
154, 156, 157, 159, 160, 162, 163, 165, 166, 168, 169, 171, 172, 174, 175, 177,
178, 180, 181, 182, 184, 185, 187, 188, 189, 191, 192, 194, 195, 196, 198, 199,
200, 201, 203, 204, 205, 206, 208, 209, 210, 211, 213, 214, 215, 216, 217, 218,
219, 220, 221, 223, 224, 225, 226, 227, 228, 229, 230, 230, 231, 232, 233, 234,
235, 236, 237, 237, 238, 239, 240, 240, 241, 242, 243, 243, 244, 245, 245, 246,
246, 247, 247, 248, 248, 249, 249, 250, 250, 251, 251, 251, 252, 252, 253, 253,
253, 253, 254, 254, 254, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255
};
/***********¶Ë¿úéèÖÃ***************/
sbit cs=P3^6;
sbit change=P3^2;
/***********Ñóê±oˉêy:Ñóê±1ms*********/
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
/***********3õê¼»ˉoˉêy***********/
void init()
{
TMOD=0X01; //é趨1¤×÷Ä￡ê½ 1
temp=ALL-Fosc/12.0/256/FREQ; //¶¨ê±Æ÷3õÖμ¼ÆËã ALL=65536 Fosc=12M ÆμÂê FREQ=100
TH_0=(uint)temp/256;
TL_0=(uint)temp%256;
EA=1; //¿a×üÖD¶Ï
EX0=1; //¿aía2¿ÖD¶Ï
IT0=1; //é趨ϽμÑØóDD§1¤×÷·½ê½
ET0=1; //é趨¶¨ê±Æ÷1¤×÷Ôú¶¨ê±·½ê½
TR0=1; //¿a¶¨ê±Æ÷ÖD¶Ï
}
/************ÇD»»2¨DÎoˉêy********************/
void qiehuan(void)
{
if(change==0)
{flag++; if(flag==4) {flag=0;n=0;}}
TH_0=(uint)temp/256;
TL_0=(uint)temp%256;
}
/***********èy½Ç2¨·￠éúoˉêy**********************/
void sanjiaobo(void)
{
for(n=0;n<255;n++)
{cs=0;P2=n;cs=1;}
for(n=255;n>0;--n)
{cs=0;P2=n;cs=1;}
}
/************·½2¨·￠éúoˉêy*********************/
void fangbo(void)
{
cs=0;P2=0XFF;cs=1;
for(n=0;n<255;n++);
cs=0;P2=0X00;cs=1;
for(n=255;n>0;n--);
}
/************¾a3Y2¨·￠éúoˉêy**********************/
void juchibo(void)
{
cs=0;P2=n++;cs=1;
}
/*************ÕyÏò2¨·￠éúoˉêy********************/
void zhengxianbo(void)
{
for(n=0;n<255;n++)
{cs=0;P2=sz[n];cs=1;}
for(n=255;n>0;n--)
{cs=0;P2=sz[n];cs=1;}
}
/*************ía2¿ÖD¶Ï·tÎñoˉêy**********************/
void ext0() interrupt 0
{
qiehuan(); //òyóÃÆμÂê¸Ä±äoˉêy ÇD»»
}
/**************¶¨ê±Æ÷ÖD¶Ïoˉêy***************/
void timer0() interrupt 1
{
TH0=TH_0;TL0=TL_0; //ÖØDÂ×°3õÖμ
TR0=0;
switch(flag)
{
case 0: {sanjiaobo();TR0=1;break;}
case 1: {fangbo();TR0=1;break;}
case 2: {juchibo();TR0=1;break;}
case 3: {zhengxianbo();TR0=1;break;}
default: ;
}
}
/**************Ö÷oˉêy********************/
void main()
{
init();
while(1);
}
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