/********************************************************************
* *
* 单片机开发板 - 1602显示实验 *
* *
* *
* *
********************************************************************/

#include <reg51.h>
#include <intrins.h>
unsigned table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6D,0x7D,0x07,0x7F,0x6F};

typedef unsigned char BYTE;
typedef unsigned int WORD;
typedef bit BOOL ;

sbit rs = P3^6;
sbit rw = P3^5;
sbit ep = P3^4;
sbit clk=P2^0;
sbit AB=P2^1;
sbit com1=P2^2;
sbit com2=P2^3;
sbit dq=P3^3;

BYTE code dis1[] = {" NAN GENG KE JI"};
BYTE code dis2[] = {" Temp:"};
bit mark;
unsigned char temp=0;
unsigned char num,k,x,T,time_s,time;
void delay1()
{ int i,j,k;
for(i=0;i<1;i++)
for(j=0;j<7;j++)
for(k=0;k<100;k++);
}
void delay2(z)
{
int x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void timer0() interrupt 1
{
num++;
if(num==20)
{num=0;T=x;}
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
}

void delay_1ms(unsigned char time)

{

unsigned char a,b;

for(a=time;a>0;a--)

for(b=200;b>0;b--);

}

void delay2us(unsigned char t)

{

while(--t);

}


void fun(num)
{
int m;
for(m=0;m<8;m++)
{
clk=0;
AB=num&0x01;
num=num>>1;
clk=1;
}
}
bit ds18b20(void)

{

bit flag;

dq=1;

delay2us(10);

dq=0;

delay2us(200);

delay2us(200);

dq=1;

delay2us(50);

flag=dq;

delay2us(25);

return flag;

}

/*向18b20写入一个字节的数据*/

void write_dat(unsigned char dat)

{

unsigned char i;

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

{

dq=0;

delay2us(2);

dq=dat&0x01;

delay2us(22);

dq=1;

dat>>=1;

}

}

/*读取18b20一个字节的数据*/

unsigned char read_dat(void)

{

unsigned char i,dat=0;

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

{

dq=0;

dat>>=1;

dq=1;

if(dq)

dat|=0x80;

delay2us(25);

}

return(dat);

}

/*读取温度*/

unsigned char get_temp()

{

unsigned char a[2]={0x00,0x00};

ds18b20();

write_dat(0xcc);

write_dat(0x44);

delay_1ms(2);

ds18b20();

write_dat(0xcc);

write_dat(0xbe);

a[0]=read_dat();

a[1]=read_dat();
temp=(((a[0]&0xf0)>>4))|((a[1]&0x0f)<<4);

return(temp);
/*********************温度数据处理程序段

if((b&0xf8)==0xf8)

{

mark=1;

b<<=8;

temp=((~(a+b))+1)*0.625;

}

else

{

mark=0;

b<<=8;

temp=(a+b)*0.625;

} */

}








/**********************************************/
/* 1602液晶显示模块 */
/**********************************************/
void delay(BYTE ms)
{ // 延时子程序
BYTE i;
while(m