web.c

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#include <REG52.h> 
#include <INTRINS.h> 

unsigned char code displaybit[]={0xfe,0xfd,0xfb,0xf7, 
0xef,0xdf,0xbf,0x7f}; 
unsigned char code displaycode[]={0x3f,0x06,0x5b,0x4f, 
0x66,0x6d,0x7d,0x07, 
0x7f,0x6f,0x77,0x7c, 
0x39,0x5e,0x79,0x71,0x00,0x40}; 
unsigned char code dotcode[32]={0,3,6,9,12,16,19,22, 
25,28,31,34,38,41,44,48, 
50,53,56,59,63,66,69,72, 
75,78,81,84,88,91,94,97}; 
unsigned char displaycount; 
unsigned char displaybuf[8]={16,16,16,16,16,16,16,16}; 
unsigned char timecount; 
unsigned char readdata[8]; 

sbit DQ=P3^7; 
bit sflag; 


bit resetpulse(void) 
{ 
unsigned char i; 

DQ=0; 
for(i=255;i>0;i--); 
DQ=1; 
for(i=60;i>0;i--); 
return(DQ); 
for(i=200;i>0;i--); 
} 

void writecommandtods18b20(unsigned char command) 
{ 
unsigned char i; 
unsigned char j; 

for(i=0;i<8;i++) 
{ 
if((command & 0x01)==0) 
{ 
DQ=0; 
for(j=35;j>0;j--); 
DQ=1; 
} 
else 
{ 
DQ=0; 
for(j=2;j>0;j--); 
DQ=1; 
for(j=33;j>0;j--); 
} 
command=_cror_(command,1); 
} 
} 

unsigned char readdatafromds18b20(void) 
{ 
unsigned char i; 
unsigned char j; 
unsigned char temp; 

temp=0; 
for(i=0;i<8;i++) 
{ 
temp=_cror_(temp,1); 
DQ=0; 
_nop_(); 
_nop_(); 
DQ=1; 
for(j=10;j>0;j--); 
if(DQ==1) 
{ 
temp=temp | 0x80; 
} 
else 
{ 
temp=temp | 0x00; 
} 
for(j=200;j>0;j--); 
} 
return(temp); 
} 

void main(void) 
{ 
TMOD=0x01; 
TH0=(65536-4000)/256; 
TL0=(65536-4000)%256; 
ET0=1; 
EA=1; 

while(resetpulse()); 
writecommandtods18b20(0xcc); 
writecommandtods18b20(0x44); 
TR0=1; 
while(1) 
{ 
; 
} 
} 

void t0(void) interrupt 1 using 0 
{ 
unsigned char x; 
unsigned int result; 

TH0=(65536-4000)/256; 
TL0=(65536-4000)%256; 
if(displaycount==2) 
{ 
P0=displaycode[displaybuf[displaycount]] | 0x80; 
} 
else 
{ 
P0=displaycode[displaybuf[displaycount]]; 
} 
P2=displaybit[displaycount]; 
displaycount++; 
if(displaycount==8) 
{ 
displaycount=0; 
} 

timecount++; 
if(timecount==150) 
{ 
timecount=0; 
while(resetpulse()); 
writecommandtods18b20(0xcc); 
writecommandtods18b20(0xbe); 
readdata[0]=readdatafromds18b20(); 
readdata[1]=readdatafromds18b20(); 
for(x=0;x<8;x++) 
{ 
displaybuf[x]=16; 
} 
sflag=0; 
if((readdata[1] & 0xf8)!=0x00) 
{ 
sflag=1; 
readdata[1]=~readdata[1]; 
readdata[0]=~readdata[0]; 
result=readdata[0]+1; 
readdata[0]=result; 
if(result>255) 
{ 
readdata[1]++; 
} 
} 
readdata[1]=readdata[1]<<4; 
readdata[1]=readdata[1] & 0x70; 
x=readdata[0]; 
x=x>>4; 
x=x & 0x0f; 
readdata[1]=readdata[1] | x; 
x=2; 
result=readdata[1]; 
while(result/10) 
{ 
displaybuf[x]=result%10; 
result=result/10; 
x++; 
} 
displaybuf[x]=result; 
if(sflag==1) 
{ 
displaybuf[x+1]=17; 
} 
x=readdata[0] & 0x0f; 
x=x<<1; 
displaybuf[0]=(dotcode[x])%10; 
displaybuf[1]=(dotcode[x])/10; 
while(resetpulse()); 
writecommandtods18b20(0xcc); 
writecommandtods18b20(0x44); 
} 
}