#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit DQ=P3^7;
sbit RS=P1^6;
sbit EN=P1^7;
unsigned char code str1[]={"T:"};
unsigned char code str2[]={" "};
uchar data disdata[5];
uint tvalue;
uchar tflag,num;
uint s,g,fs,fg,ss,sg,num0;
unsigned char num1,num2,num3;
void delay1ms(unsigned int ms)
{
unsigned int i,j;
for(i=0;i<ms;i++)
for(j=0;j<100;j++);
}
void wr_com(unsigned char com)
{
delay1ms(1);
RS=0;
EN=0;
P0=com;
delay1ms(1);
EN=1;
delay1ms(1);
EN=0;
}
void wr_dat(unsigned char dat)
{
delay1ms(1);;
RS=1;
EN=0;
P0=dat;
delay1ms(1);
EN=1;
delay1ms(1);
EN=0;
}
void lcd_init()
{
delay1ms(15);
wr_com(0x38);
delay1ms(5);
wr_com(0x08);
delay1ms(5);
wr_com(0x01);
delay1ms(5);
wr_com(0x06);
delay1ms(5);
wr_com(0x0c);
delay1ms(5);
}
void display(unsigned char *p)
{
while(*p!='\0')
{
wr_dat(*p);
p++;
delay1ms(1);
}
}
init_play()
{ delay1ms(5);
lcd_init();
wr_com(0x80);
display(str1);
wr_com(0x82);
display(str2);
}
void delay_18B20(unsigned int i)
{
while(i--);
}
void ds1820rst()
{
unsigned char x=0;
DQ = 1;
delay_18B20(4);
DQ = 0;
delay_18B20(100);
DQ = 1;
delay_18B20(40);
}
uchar ds1820rd()
{
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_18B20(10);
}
return(dat);
}
void ds1820wr(uchar wdata)
{
unsigned char i=0;
for (i=8; i>0; i--)
{
DQ = 0;
DQ = wdata&0x01;
delay_18B20(10);
DQ = 1;
wdata>>=1;
}
}
read_temp()
{
uchar a,b;
ds1820rst();
ds1820wr(0xcc);
ds1820wr(0x44);
ds1820rst();
ds1820wr(0xcc);
ds1820wr(0xbe);
a=ds1820rd();
b=ds1820rd();
tvalue=b;
tvalue<<=8;
tvalue=tvalue|a;
if(tvalue<0x0fff)
tflag=0;
else
{
tvalue=~tvalue+1;
tflag=1;
}
tvalue=tvalue*(0.625);
return( tvalue);
}
void ds1820disp()
{
uchar flagdat;
disdata[0]=tvalue/1000+0x30;
disdata[1]=tvalue%1000/100+0x30;
disdata[2]=tvalue%100/10+0x30;
disdata[3]=tvalue%10+0x30;
if
(tflag==0)
flagdat=0x20;
else
flagdat=0x2d;
if(disdata[0]==0x30)
{
disdata[0]=0x20;
if
(disdata[1]==0x30)
{disdata[1]=0x20;
}
}
wr_com(0x83);
wr_dat(flagdat); delay_18B20(4);
wr_com(0x84);
wr_dat(disdata[0]); delay_18B20(4);
wr_com(0x85);
wr_dat(disdata[1]); delay_18B20(4);
wr_com(0x86);
wr_dat(disdata[2]); delay_18B20(4);
wr_com(0x87);
wr_dat(0x2e); delay_18B20(4);
wr_com(0x88);
wr_dat(disdata[3]); delay_18B20(4);
}
void main()
{
init_play();
while(1)
{
read_temp();
ds1820disp();
delay1ms(5);
}
}
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