ds18b20的显示程序

#include <hidef.h>      /* common defines and macros */
#include "derivative.h"      /* derivative-specific definitions */
#define uchar unsigned char
#define uint  unsigned int
#define lcd12864_date   PORTB //数据口 
#define lcd12864_rs   PTT_PTT5// PTT_PTT5;      //寄存器选择输入 
#define lcd12864_rw   PTT_PTT3     //液晶读/写控制
#define lcd12864_e    PTT_PTT2   //液晶使能控制 
#define    DQ         PORTA_PA0                // 定义DQ引脚为P3.3 
#define  DQ_HIGH()      DDRA=0         //设置数据口为输入
#define  DQ_LOW()     DDRA=1;DQ=0;         //设置数据口为输出
//uint  temp;                           //温度值 variable of temperature
uchar A1,A2,A3;   
void delay2(uint i); 
void Init_Ds18b20(void);  
uchar Read_One_Byte(); 
void Write_One_Byte(uchar dat);
uint Get_Tmp(); 
void DisplayTemp(uint temp) ; 
void delay(unsigned int t)   
{
  uint i,j;
  for(i=t;i>0;i--)
   for(j=1000;j>0;j--);
}
 

void lcd12864_write_cmd(unsigned char command) //写指令
{
  lcd12864_rs=0;

  lcd12864_rw=0;
  lcd12864_e=0;
  lcd12864_date=command;
  delay(5);
  lcd12864_e=1;
  lcd12864_e=0;
  delay(5);      
}


void lcd12864_write_data(unsigned char data) // 写数据 写入一个字符
{
  lcd12864_rs=1;
  lcd12864_rw=0;
  lcd12864_e=0;
  lcd12864_date=data;
  delay(5);
  lcd12864_e=1;
  lcd12864_e=0;
  delay(5);       
}

 
void lcd12864_pos(unsigned char x,unsigned char y)  //确定位置
{                          
   unsigned char  pos;
   if (x==1)
     {x=0x80;}
   else if (x==2)
     {x=0x90;}