1.单DS18B20温度读取#include<reg52.h>#include<intrins.h>#define uchar unsigned char#define uint unsigned intsbit DQ = P1^4; //数据线端口void delayms(uint x) //延时函数{uchar j;while(x--){for(j=0;j<123;j++){;}}}//ROM操作命令#define READ_ROM 0x33 //读ROM#define SKIP_ROM 0xCC //跳过ROM#define MATCH_ROM 0x55 //匹配ROM#define SEARCH_ROM 0xF0 //搜索ROM#define ALARM_SEARCH 0xEC //告警搜索//存储器操作命令#define ANEW_MOVE 0xB8 //重新调出E^2数据#define READ_POWER 0xB4 //读电源#define TEMP_SWITCH 0x44 //启动温度变换#define READ_MEMORY 0xBE //读暂存存储器#define COPY_MEMORY 0x48 //复制暂存存储器#define WRITE_MEMORY 0x4E //写暂存存储器//数据存储结构typedef struct tagTempData{unsigned char btThird; //百位数据unsigned char btSecond; //十位数据unsigned char btFirst; //个位数据unsigned char btDecimal; //小数点后一位数据unsigned char btNegative; //是否为负数}TEMPDATA;void Delay16us() //延时16us子函数{unsigned char a;for (a = 0; a < 4; a++);}void Delay60us() //延时60us子函数{unsigned char a;for (a = 0; a < 18; a++);}void Delay480us() //延时480us子函数{unsigned char a;for (a = 0; a < 158; a++);}void Delay240us() //延时240us子函数{unsigned char a;for (a = 0; a < 78; a++);}void Initialization() //芯片初始化{while(1) //无限循环知道收到了存在脉冲（即DS18B20的应答脉冲）{DQ = 0;Delay480us(); //延时480us 复位单总线至少480us的低电平信号DQ = 1;Delay60us(); //延时60us 在复位电平结束后将数据总线拉高，以便在15~60us后接收存在脉冲if(~DQ) //收到ds18b20的应答信号{DQ = 1;Delay240us(); //延时240us 存在脉冲为一个60~240us的低电平信号break;}}}void WriteByte(unsigned char btData) //写ROM(从低位开始写) {unsigned char i, btBuffer;for (i = 0; i < 8; i++){btBuffer = btData >> i; //最低位移出if (btBuffer & 1){DQ = 0;_nop_(); //延时1个机器周期_nop_();DQ = 1;Delay60us(); //延时60us}else{DQ = 0;Delay60us();DQ = 1;}}}unsigned char ReadByte() //读ROM(从低位开始读) {unsigned char i, btDest;for (i = 0; i < 8; i++){btDest >>= 1;DQ = 0;_nop_();_nop_();DQ = 1;Delay16us();if (DQ) btDest |= 0x80;Delay60us();}return btDest;}//读取温度值TEMPDATA ReadTemperature(){TEMPDATA TempData; //定义储存结构用于存储温度的值unsigned int iTempDataH;unsigned char btDot, iTempDataL;TempData.btNegative = 0; //为0温度为正Initialization();WriteByte(SKIP_ROM); //跳过ROM匹配WriteByte(TEMP_SWITCH); //启动温度转换delayms(1); //温度转换需要时间500usInitialization();WriteByte(SKIP_ROM); //跳过ROM匹配(单个芯片时用这句换掉上面的switch)WriteByte(READ_MEMORY); //读暂存储存数据iTempDataL = ReadByte(); //读取温度的低8位iTempDataH = ReadByte(); //读取温度的高8位iTempDataH <<= 8;iTempDataH |= iTempDataL;if (iTempDataH & 0x8000) //判断温度的值是否为负数{TempData.btNegative = 1; //负数标志iTempDataH = ~iTempDataH + 1; //负数求补}btDot = (unsigned char)(iTempDataH & 0x000F); //得到小数部分iTempDataH >>= 4; //得到整数部分btDot *= 5; //btDot*10/16得到转换后的小数数据btDot >>= 3;//数据处理TempData.btThird = (unsigned char)iTempDataH /100; //整数部分的百位TempData.btSecond = (unsigned char)iTempDataH % 100/10;//整数部分的十位TempData.btFirst = (unsigned char)iTempDataH % 10; //整数部分的个位TempData.btDecimal = btDot; //小数点后的一位return TempData; //函数返回温度值的存储结构体}2.多个DS18B20单总线温度读取#include<reg52.h>#include<intrins.h>#define uchar unsigned char#define uint unsigned intsbit DQ = P2^7; //数据线端口unsigned char channel,n=0;void delayms(uint x) //延时函数{uchar j;while(x--){for(j=0;j<123;j++){;}}}//ROM操作命令#define READ_ROM 0x33 //读ROM#define SKIP_ROM 0xCC //跳过ROM #define MATCH_ROM 0x55 //匹配ROM #define SEARCH_ROM 0xF0 //搜索ROM//存储器操作命令#define ANEW_MOVE 0xB8//重新调出E^2数据#define READ_POWER 0xB4 //读电源#define TEMP_SWITCH 0x44 //启动温度变换#define READ_MEMORY 0xBE //读暂存存储器#define COPY_MEMORY 0x48 //复制暂存存储器#define WRITE_MEMORY 0x4E //写暂存存储器//数据存储结构typedef struct tagTempData{unsigned char btThird; //百位数据unsigned char btSecond; //十位数据unsigned char btFirst; //个位数据unsigned char btDecimal; //小数点后一位数据unsigned char btNegative; //是否为负数}TEMPDATA;//DS18B20序列号const unsigned char code ROMData1[8] = {0x28, 0x33, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0xD7}; //U1const unsigned char code ROMData2[8] = {0x28, 0x30, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x8E}; //U2const unsigned char code ROMData3[8] = {0x28, 0x31, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0xB9}; //U3const unsigned char code ROMData4[8] = {0x28, 0x32, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0xE0}; //U4const unsigned char code ROMData5[8] = {0x28, 0x34, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x52}; //U5const unsigned char code ROMData6[8] = {0x28, 0x35, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x65}; //U6const unsigned char code ROMData7[8] = {0x28, 0x36, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x3C}; //U7const unsigned char code ROMData8[8] = {0x28, 0x37, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x0B}; //U8void Delay16us() //延时16us子函数{unsigned char a;for (a = 0; a < 4; a++);}void Delay60us() //延时60us子函数{unsigned char a;for (a = 0; a < 18; a++);}void Delay480us() //延时480us子函数{unsigned char a;for (a = 0; a < 158; a++);}void Delay240us() //延时240us子函数{unsigned char a;for (a = 0; a < 78; a++);}void Initialization() //芯片初始化{while(1) //无限循环知道收到了存在脉冲（即DS18B20的应答脉冲）{DQ = 0;Delay480us(); //延时480us 复位单总线至少480us的低电平信号DQ = 1;Delay60us(); //延时60us 在复位电平结束后将数据总线拉高，以便在15~60us后接收存在脉冲if(!DQ) //收到ds18b20的应答信号{DQ = 1;Delay240us(); //延时240us 存在脉冲为一个60~240us的低电平信号break;}}}void WriteByte(unsigned char btData) //写ROM(从低位开始写) {unsigned char i, btBuffer;for (i = 0; i < 8; i++){btBuffer = btData >> i; //最低位移出if (btBuffer & 1){_nop_(); //延时1个机器周期_nop_();DQ = 1;Delay60us(); //延时60us}else{DQ = 0;Delay60us();DQ = 1;}}}unsigned char ReadByte() //读ROM(从低位开始读) {unsigned char i, btDest;for (i = 0; i < 8; i++){DQ = 0;_nop_();_nop_();DQ = 1;Delay16us();if (DQ) btDest |= 0x80;Delay60us();}return btDest;}//序列号匹配void MatchROM(const unsigned char *pMatchData) {unsigned char i;Initialization(); //芯片初始化WriteByte(MATCH_ROM); //写入匹配ROM指令for (i = 0; i < 8; i++) WriteByte(*(pMatchData + i)); }//读取温度值TEMPDATA ReadTemperature(){TEMPDATA TempData; //定义储存结构用于存储温度的值unsigned int iTempDataH;unsigned char btDot, iTempDataL;static unsigned char i = 0;TempData.btNegative = 0; //为0温度为正i++;if (i == 9) i = 1;channel=i;Initialization();WriteByte(SKIP_ROM); //跳过ROM匹配WriteByte(TEMP_SWITCH); //启动温度转换if(n==0)delayms(1000); //温度转换需要时间500msn++;if(n==8)n=1;delayms(1);Initialization();//多个芯片的时候用MatchROM(ROMData)换掉WriteByte(SKIP_ROM)switch (i){case 1 : MatchROM(ROMData1); break; //匹配1case 2 : MatchROM(ROMData2); break; //匹配2case 3 : MatchROM(ROMData3); break; //匹配3case 4 : MatchROM(ROMData4); break; //匹配4case 5 : MatchROM(ROMData5); break; //匹配5case 6 : MatchROM(ROMData6); break; //匹配6case 7 : MatchROM(ROMData7); break; //匹配7case 8 : MatchROM(ROMData8); break; //匹配8 }//WriteByte(SKIP_ROM); //跳过ROM匹配(单个芯片时用这句换掉上面的switch)WriteByte(READ_MEMORY); //读暂存储存数据iTempDataL = ReadByte(); //读取温度的低8位iTempDataH = ReadByte(); //读取温度的高8位iTempDataH <<= 8;iTempDataH |= iTempDataL;if (iTempDataH & 0x8000) //判断温度的值是否为负数{TempData.btNegative = 1; //负数标志iTempDataH = ~iTempDataH + 1; //负数求补}btDot = (unsigned char)(iTempDataH & 0x000F); //得到小数部分iTempDataH >>= 4; //得到整数部分btDot *= 5; //btDot*10/16得到转换后的小数数据btDot >>= 3;//数据处理TempData.btThird = (unsigned char)iTempDataH / 100;//整数部分的百位TempData.btSecond = (unsigned char)iTempDataH % 100 / 10;//整数部分的十位TempData.btFirst = (unsigned char)iTempDataH % 10;//整数部分的个位TempData.btDecimal = btDot; //小数点后的一位return TempData; //函数返回温度值的存储结构体}3. DS18B20的序列号读取程序<用LCD1602显示序列号>#include<reg52.h>#include<LCD1602.h>#include<string.h>#define uchar unsigned char#define uint unsigned intuchar sn[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10};uchar t;uchart01,t02,t11,t12,t21,t22,t31,t32,t41,t42,t51,t52,t61,t62,t71,t72;sbit DQ=P2^7;//ds18b20与单片机连接口void delay1ms(unsigned int ms)// 延时1毫秒（不够精确的）{unsigned int i,j;for(i=0;i<ms;i++)for(j=0;j<100;j++);}void delay_18B20(unsigned int i)// 延时1微秒{while(i--);}void ds1820rst()/*ds1820复位*/{unsigned char x=0;DQ = 1; //DQ复位delay_18B20(4); //延时DQ = 0; //DQ拉低delay_18B20(100); //精确延时大于480usDQ = 1; //拉高delay_18B20(40);}uchar ds1820rd()/*读数据*/{unsigned char i=0;unsigned char dat = 0;for (i=8;i>0;i--){DQ = 0; //给脉冲信号dat>>=1;DQ = 1; //给脉冲信号if(DQ)dat|=0x80;delay_18B20(10);}return(dat);}void ds1820wr(uchar wdata)/*写数据*/{unsigned char i=0;for (i=8; i>0; i--){DQ = 0;DQ = wdata&0x01;delay_18B20(10);DQ = 1;wdata>>=1;}}////////////////////////读取器件序列号子程序////////////////////////////void rom(void){ds1820rst(); //复位//delay1ms(1); //延时//ds1820wr(0x33); //发送读序列号子程序//sn[0]=ds1820rd(); //连续读出64位ROM t01=sn[0]/16;t02=sn[0]%16; //转为16进制sn[1]=ds1820rd(); //t11=sn[1]/16;t12=sn[1]%16; //转为16进制sn[2]=ds1820rd(); //t21=sn[2]/16;t22=sn[2]%16; //转为16进制sn[3]=ds1820rd(); //t31=sn[3]/16;t32=sn[3]%16; //转为16进制sn[4]=ds1820rd(); //t41=sn[4]/16;t42=sn[4]%16; //转为16进制sn[5]=ds1820rd(); //t51=sn[5]/16;t52=sn[5]%16; //转为16进制sn[6]=ds1820rd(); //t61=sn[6]/16;t62=sn[6]%16; //转为16进制sn[7]=ds1820rd(); //t71=sn[7]/16;t72=sn[7]%16; //转为16进制}void chuan(uchar i,uchar j,uchar x) {if(x<10)DisplayOne(i,j,x,1);if(x==10)DisplayOne(i,j,'A',0);if(x==11)DisplayOne(i,j,'B',0);if(x==12)DisplayOne(i,j,'C',0);if(x==13)DisplayOne(i,j,'D',0);if(x==14)DisplayOne(i,j,'E',0);if(x==15)DisplayOne(i,j,'F',0);}void Displaychar(){chuan(0,0,t01);chuan(0,1,t02);chuan(0,4,t11);chuan(0,5,t12);chuan(0,8,t21);chuan(0,9,t22);chuan(0,12,t31);chuan(0,13,t32);chuan(1,0,t41);chuan(1,1,t42);chuan(1,4,t51);chuan(1,5,t52);chuan(1,8,t61);chuan(1,9,t62);chuan(1,12,t71);chuan(1,13,t72);}/********************主程序***********************************/void main(){Clear();Init();while(1){rom(); //调用读序列号子程序//Displaychar();}}。
