18B20温度检测，单片机

#include <reg52.h> #define uchar unsigned char #define uint unsigned int sbit DS=P2^7; //define interface 定义接口 uint temp; // variable of temperature 定义一个变量用来表示温度 uchar flag1; // sign of the result positive or negative 定义一个标志，标志温度是否还是正 sbit P2_0=P2^0; //数码管位选 sbit P2_1=P2^1; sbit P2_2=P2^2; unsigned char code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82, //数字编码 0xf8,0x80,0x90}; unsigned char code table1[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02, //带小数点的编码 0x78,0x00,0x10}; void delay(uint count) //delay 延时子程序 { uint i; while(count) { i=200; while(i>0) i--; count--; } }