基于AT89S52和DS18B20的数字温度计的设计报告

#include
#include
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};
signed int 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=(65535-4000)/256;
TL0=(65535-4000)%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=(65535-4000)/256;
TL0=(65535-4000)%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==500)
{
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);
}

}

好不好使不知道，也是摘抄的，错了别介意啊，呵呵

#include

#include
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};
signed
int
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=(65535-4000)/256;
TL0=(65535-4000)%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=(65535-4000)/256;
TL0=(65535-4000)%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==500)
{
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);
}
}
好不好使不知道，也是摘抄的，错了别介意啊，呵呵