keven032的博客

这是个18b20的温度计的接线图 #include "reg52.h" #include "intrins.h" //_nop_();延时函数用 #define Disdata P0 //段码输出口 #define discan P1 //扫描口 #define uchar unsigned char #define uint unsigned int sbit DQ="P1"^6; //温度输入口 sbit DIN="P0"^7; //LED小数点控制 uint h; // // //*******温度小数部分用查表法**********// uchar code ditab[16]={0x00,0x01,0x01,0x02,0x03,0x03,0x04,0x04,0x05,0x06,0x06,0x07,0x08,0x08,0x09,0x09}; // uchar code dis_7[12]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xff,0xbf}; /* 共阳LED段码表 "0" "1" "2" "3" "4" "5" "6" "7" "8" "9" "不亮" "-" */ uchar code scan_con[4]={0xfe,0xfd,0xfb,0xf7}; // 列扫描控制字 uchar data temp_data[2]={0x00,0x00}; // 读出温度暂放 uchar data display[5]={0x00,0x00,0x00,0x00,0x00};//显示单元数据,共4个数据,一个运算暂存用 // // // /***********11微秒延时函数**********/ // void delay(uint t) { for(;t>0;t--); } // /***********显示扫描函数**********/ scan() { char k; for(k=0;k<4;k++) //四位LED扫描控制 { Disdata="dis"_7[display[k]]; if(k==1){DIN=0;} discan="scan"_con[k];delay(90);discan=0xff; } } // //