#define uchar unsigned char #define uint unsigned int;sbit seg1=P2^0; sbit seg2=P2^1; sbit seg3=P2^2; sbit DQ=P1^3; sfr dataled=0x80;
uint temp;
uchar flag_get,count,num,minute,second;
uchar code tab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; uchar str[6];
void delay1(uchar MS);
unsigned int ReadTemperature(void); void Init_DS18B20(void); unsigned char ReadOneChar(void); void WriteOneChar(unsigned char dat); void delay(unsigned int i);
main() {
unsigned char TempH,TempL; TMOD|=0x01; TH0=0xef; TL0=0xf0; IE=0x82; TR0=1; P2=0x00; count=0; while(1) {
str[5]=0x39;
str[1]=tab[TempH/100]; str[2]=tab[(TempH%100)/10]; str[3]=tab[(TempH%100)%10]|0x80; str[4]=tab[TempL]; if(flag_get==1) {
temp=ReadTemperature(); if(temp&0x8000) {
str[0]=0x40; temp=~temp; temp +=1; } else
str[0]=0; TempH=temp>>4;
TempL=temp&0x0F; TempL=TempL*6/10; flag_get=0; } } }
void tim(void) interrupt 1 using 1 {
TH0=0xef; TL0=0xf0; num++; if (num==50) {
num=0; flag_get=1; second++; if(second>=60) {
second=0; minute++; }
} count++; if(count==1) {
P2=0;
dataled=str[0]; }
if(count==2) {
P2=1;
dataled=str[1];
}
if(count==3) {
P2=2;
dataled=str[2]; }
if(count==4) {
P2=3;
dataled=str[3]; }
if(count==5) {
P2=4;
dataled=str[4]; }
if(count==6) {
P2=5;
dataled=str[5]; count=0;
} }
void delay(unsigned int i) {
while(i--); }
void Init_DS18B20(void) {
unsigned char x=0; DQ = 1; delay(8); DQ = 0; delay(80); DQ = 1; delay(10); x=DQ; delay(5); }
unsigned char ReadOneChar(void) {
unsigned char i=0; unsigned char dat = 0; for (i=8;i>0;i--) {
DQ = 0; dat>>=1; DQ = 1; if(DQ)
dat|=0x80;
delay(5); }
return(dat); }
void WriteOneChar(unsigned char dat) {
unsigned char i=0; for (i=8; i>0; i--) {
DQ = 0; DQ = dat&0x01; delay(5); DQ = 1; dat>>=1; }
delay(5); }
unsigned int ReadTemperature(void) {
unsigned char a=0; unsigned int b=0; unsigned int t=0; Init_DS18B20(); WriteOneChar(0xCC); WriteOneChar(0x44); delay(200); Init_DS18B20(); WriteOneChar(0xCC); WriteOneChar(0xBE);
a=ReadOneChar(); b=ReadOneChar(); b<<=8; t=a+b; return(t); }
