DS18B20温度1602液晶显示程序

#include

#include

#define uchar unsigned char

#define uint unsigned int

uchar baizhi=0;

sbit DQ=P3^4;

uchar code disp[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; uchar code num[10]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef}; void delay(uint i)

{

while(i--);

}

void init()

{

DQ=1;

_nop_();

DQ=0;

delay(60);

DQ=1;

delay(100);

if(DQ==0)

{

baizhi=1;

delay(20);

DQ=1;

}

if(DQ==1)

{

baizhi=0;

delay(20);

DQ=1;

}

}

uchar read_date(void)

{

uchar temp,i;

for(i=0;i<8;i++)

{

DQ=1;

_nop_();

_nop_();

DQ=0;

_nop_();

_nop_();

_nop_();

DQ=1;

_nop_();

temp>>=1;

if(DQ)

{

temp=temp|0x80;

}

delay(5);

}

return temp;

}

void write_date(uchar date)

{

uchar i;

for(i=0;i<8;i++)

{

DQ=0;

_nop_();

_nop_();

DQ=date&0x01;

delay(5);

DQ=1;

date>>=1;

}

}

uint dcwdsj(void)

{

uchar themh=0;

uchar theml=0;

uint tem=0;

init();

if(baizhi==0)

{

write_date(0xcc);

write_date(0x44);

delay(100);

}

init();

if(baizhi==0)

{

write_date(0xcc);

write_date(0xbe);

theml=read_date();

themh=read_date();

}

tem=(themh*256+theml)*25;

tem=tem>>2;

return tem;

}

void main()

{

uint them;

uchar com=20;

them=dcwdsj();

while(1)

{

com--;

if(com==0)

{

them=dcwdsj();

com=20;

}

P1=0x00;

P0=0xc6;

P1=0x20;

delay(100); //C

P1=0x00;

P0=0x7f;

P1=0x04;

delay(100);

P1=0x00;

P0=disp[them%1000%100%10];

P1=0x10;

delay(100);

P1=0x00;

P0=disp[them%1000%100/10];

P1=0x08;

delay(100);

P1=0x00;

P0=disp[them%1000/100];

P1=0x02;

delay(100);

P1=0x00;

P0=disp[them/1000%10];

P1=0x01;

delay(100);

}

}