AT89X52单片机多点测温程序：18b20 ROM匹配与读取

#include<AT89X52.h>
#define uint unsigned int
#define uchar unsigned char
sbit rs=P2^6;
sbit Lcden=P2^7;
uchar table1[]="##      welcome!";
uchar table2[]="## **** TMP MCU~";
sbit DS=P2^0;           //define interface
sbit key0=P1^0;
sbit key1=P1^1;
uint temp=0;             // variable of temperature
uint keyvalue=0;
uint flag;
//unsigned char ID1[8]={0x28,0x49,0x31,0x08,0x02,0x00,0x00,0x0e7};
//unsigned char ID2[8]={0x28,0x15,0x32,0x2d,0x02,0x00,0x00,0x0b};
//unsigned char ID3[8]={0x28,0x7c,0x9a,0x0f6,0x01,0x00,0x00,0x22};
//unsigned char ID4[8]={0x28,0x05a,0x0f5,0x2c,0x02,0x00,0x00,0x0a6};
//unsigned char ID5[8]={0x28,0x8c,0x58,0x08,0x02,0x00,0x00,0x71};
//unsigned char ID6[8]={0x28,0x0f1,0x2e,0x2d,0x02,0x00,0x00,0x0a3};
//unsigned char ID7[8]={0x28,0x03,0x2b,0x08,0x02,0x00,0x00,0x9c};
//unsigned char ID8[8]={0x28,0x0af,0x49,0x08,0x02,0x00,0x00,0x2f};
//unsigned char ID9[8]={0x28,0x72,0x0f3,0x2c,0x02,0x00,0x00,0x2d};
unsigned char code SN1_9[9][8]={{0x28,0x49,0x31,0x08,0x02,0x00,0x00,0x0e7},
{0x28,0x15,0x32,0x2d,0x02,0x00,0x00,0x0b},
{0x28,0x7c,0x9a,0x0f6,0x01,0x00,0x00,0x22},
{0x28,0x0ed,0x52,0x08,0x02,0x00,0x00,0x38},
{0x28,0x8c,0x58,0x08,0x02,0x00,0x00,0x71},
{0x28,0x0f1,0x2e,0x2d,0x02,0x00,0x00,0x0a3},
{0x28,0x03,0x2b,0x08,0x02,0x00,0x00,0x9c},
{0x28,0x0af,0x49,0x08,0x02,0x00,0x00,0x2f},

{0x28,0x72,0x0f3,0x2c,0x02,0x00,0x00,0x2d}
};
unsigned int T[9]={0x00,0x00,0x00,0x00};
void write_T(uint tt);
 ///////18b20延时///////
void delay(uint count)      //delay
{
  uint i;
  while(count)
  {
    i=200;
    while(i>0)
    i--;
    count--;
  }
}
///////1602延时///////
void delay0(uint a)//1ms延时
{
uint x,y;
for(x=a;x>0;x--)
for(y=110;y>0;y--);
}
///////1602写命令///////
void write_com(uchar com)
{
P0=com;
rs=0;
Lcden=0;
delay0(5);