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#include<reg51.h>
#include<intrins.h>
#include<absacc.h>
#define uchar unsigned char
#define uint unsigned int
#define BUSY 0x80
sbit RS=P2^0;
sbit RW=P2^1;
sbit E=P2^2;
sbit DQ=P2^7;
sbit LED=P3^7;
uchar temp_data_L,temp_data_H;
uchar code look_ASCII[10]=
{0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};
uchar code TABLE_DECIMAL[16]=
{0X30,0X31,0X31,0X32,0X33,0X33,0X34,0X34,0X35,0X36,0X36,0X37,0X38,0X38,0X39,0X39};
uchar display1[16]=
{0x53,0x45,0x54,0x5F,0x54,0x45,0x4D,0x50,0x3A,0x00,0x00,0x00,0x2E,0x30,0xDF,0x43};
uchar display2[16]=
{0x43,0x55,0x52,0x5F,0x54,0x45,0x4D,0x50,0x3A,0x00,0x00,0x00,0x2E,0x00,0xDF,0x43};
uint temp_current,temp_set=40;
void delay(uint m)
{
uint i;
for(i=0;i<m;i++);
}
bit resetpulse(void)
{
DQ=0;
delay(40);
DQ=1;
delay(4);
return(DQ);
}
void DS18B20_init(void)
{
while(1)
{
if(!resetpulse())
{
DQ=1;
delay(40);
break;
}
else
resetpulse();
}
}
uchar read_bit(void)
{
DQ=0;
_nop_();
_nop_();
DQ=1;
delay(2);
return(DQ);
}
uchar read_byte(void)
{
uchar i,shift,temp;
shift=1;
temp=0;
for(i=0;i<8;i++)
{
if(read_bit())
{
temp=temp+(shift<<i);
}
delay(7);
}
return(temp);
}
void write_bit(uchar temp)
{
DQ=0;
if(temp==1)
DQ=1;
delay(5);
DQ=1;
}
void write_byte(uchar value)
{
uchar i,temp;
for(i=0;i<8;i++)
{
temp=value>>i;
temp=temp&0x01;
write_bit(temp);
delay(5);
}
}
void read_temp()
{
DS18B20_init();
write_byte(0xCC);
write_byte(0x44);
delay(500);
DS18B20_init();
write_byte(0xCC);
write_byte(0xBE);
temp_data_L=read_byte();
temp_data_H=read_byte();
}
void test_LCDbusy()
{
P0=0xFF;
E=1;
RS=0;
RW=1;
_nop_();
while(P0&BUSY)
{
E=0;
_nop_();
E=1;
_nop_();
}
E=0;
}
void write_LCDcomm(uchar Comm)
{
test_LCDbusy();
RS=0;
RW=0;
E=0;
_nop_();
P0=Comm;
_nop_();
E=1;
_nop_();
E=0;
}
void write_LCDdata(uchar Data)
{
test_LCDbusy();
P0=Data;
RS=1;
RW=1;
E=1;
_nop_();
E=0;
}
void convert_temp()
{
if((temp_data_H&0xF0)==0xF0)
{
temp_data_L=~temp_data_L;
if(temp_data_L==0xFF)
{
temp_data_L=temp_data_L+0x01;
temp_data_H=~temp_data_H;
temp_data_H=~temp_data_H+0x01;
}
else
{
temp_data_L=temp_data_L+0x01;
temp_data_H=~temp_data_H;
}
display2[13]=TABLE_DECIMAL[temp_data_L&0x0F];
temp_current=((temp_data_L&0xF0)>>4)|((temp_data_H&0x0F)<<4);
display2[9]=0x2D;
display2[10]=look_ASCII[(temp_current%100)/10];
display2[11]=look_ASCII[(temp_current%100)%10];
if((temp_current%100)/10==0)
{
display2[9]=0;
display2[10]=0x2D;
}
else
{
display2[13]=TABLE_DECIMAL[temp_data_L&0x0F];
temp_current=((temp_data_L&0xF0)>>4)|((temp_data_H&0x0F)<<4);
display2[9]=look_ASCII[temp_current/100];
display2[10]=look_ASCII[(temp_current%100)/10];
display2[11]=look_ASCII[(temp_current%100)%10];
if(temp_current/100==0)
{
display2[9]=0;
if((temp_current%100)/10==0)display2[10]=0;
}
}
}
}
void set_temp()
{
display1[9]=look_ASCII[temp_set/100];
display1[10]=look_ASCII[(temp_set%100)/10];
display1[11]=look_ASCII[(temp_set%100)%100];
if(temp_set/100==0)
{
display1[9]=0;
if((temp_set%100)/10==0)display1[10]=0;
}
}
void init_LCD(void)
{
write_LCDcomm(0x01);
write_LCDcomm(0x38);
write_LCDcomm(0x0C);
write_LCDcomm(0x06);
}
void display_temp()
{
uchar i;
write_LCDcomm(0x80);
for(i=0;i<16;i++)
{
write_LCDdata(display1[i]);
}
write_LCDcomm(0xC0);
for(i=0;i<16;i++)
{
write_LCDdata(display2[i]);
}
}
void main()
{
IE=0x85;
IT0=1;
IT1=1;
init_LCD();
LED=0;
while(1)
{
read_temp();
convert_temp();
set_temp();
display_temp();
if(temp_current>=temp_set){LED=~LED;delay(20);}
else LED=0;
delay(20);
}
}
void EX_INT0()interrupt 0
{
temp_set++;
}
void EX_INT1()interrupt 2
{
temp_set--;

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