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main.c

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#include "DS18B20.h"

void main()
{
    unsigned char temperature[2];
    unsigned char num;
    //unsigned char id[4][8];

    Delay500ms();
    Delay500ms();
    UART_INIT();
    while(1)
    {
//        ReadTemperature(temperature, 2);
//        SendByte(temperature[0]);
//        SendByte(temperature[1]);
        num = DS18B20_Search_Rom();
        SendStr("ID=");
        SendHEX(num);
        SendLR();


//        foreach(num);

        Delay500ms();
        Delay500ms();
        Delay500ms();
        Delay500ms();
    }
}

DS18B20.h

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#include "uart.h"
#include "sys.h"

sbit DQ =P3^5;                  //数据传输线接单片机的相应的引脚

//DS18B20指令
typedef enum
{
    SEARCH_ROM          =   0xf0,   //搜索ROM指令
    READ_ROM            =   0x33,   //读取ROM指令
    MATH_ROM            =   0x55,   //匹配ROM指令
    SKIP_ROM            =   0xcc,   //跳过ROM指令
    ALARM_SEARCH        =   0xec,   //报警搜索指令
    CONVERT_T           =   0x44,   //温度转换指令
    WRITE_SCRATCHPAD    =   0x4e,   //写暂存器指令
    READ_SCRATCHPAD     =   0xbe,   //读取转存器指令
    COPY_SCRATCHPAD     =   0x48,   //拷贝暂存器指令
    RECALL_E2           =   0xb8,   //召回EEPROM指令
    READ_POWER_SUPPLY   =   0xb4,   //读取电源模式指令
} DS18B20_CMD;


/**************************************
复位DS18B20,并检测设备是否存在
**************************************/
void DS18B20_Reset()
{
    /* 复位请求  */
    DQ = 0;                     //送出低电平复位信号
    Delay500us();               //延时至少480us
    DQ = 1;                     //释放数据线

    /* 复位响应  */
    while(1==DQ);               //直到总线被DS18B20拉低
    while(0==DQ);               //直到总线被DS18B20拉高
}


/**************************************
从DS18B20读1字节数据
**************************************/
unsigned char DS18B20_ReadByte()
{
    unsigned char i   = 0;
    unsigned char dat = 0;
    for (i=0; i<8; i++)             //8位计数器
    {
        dat >>= 1;
        DQ = 0;                     //开始时间片
        Delay1us();                 //延时等待
        DQ = 1;                     //准备接收
        Delay1us();                //接收延时
        if (DQ)                     //读取数据
        {
            dat |= 0x80;
        }
        Delay60us();               //等待时间片结束
    }
    return dat;
}

/**************************************
向DS18B20写1字节数据
**************************************/
void DS18B20_WriteByte(unsigned char dat)
{
    char i;
    for (i=0; i<8; i++)             //8位计数器
    {
        DQ = 0;                     //开始时间片
        Delay1us();                //延时等待
        DQ = 0X01 & dat;
        Delay60us();               //等待时间片结束
        DQ = 1;                     //恢复数据线
        Delay1us();                //恢复延时
        dat >>= 1;                  //送出数据
    }
}

/* 读1位 */
bit DS18B20_read_bit()
{
    bit dat = 0;

    DQ = 0;                     //开始时间片
    Delay1us();                //延时等待
    DQ = 1;                     //准备接收
    Delay1us();;                //接收延时
    if (DQ)                     //读取数据
    {
        dat = 1;
    }
    Delay60us();               //等待时间片结束
    return dat;
}

/* 写1位 */
bit DS18B20_write_bit(bit dat)  //
{
    DQ = 0;                     //开始时间片
    Delay1us();                //延时等待
    DQ = dat;
    Delay60us();;               //等待时间片结束
    DQ = 1;                     //恢复数据线
    Delay1us();                //恢复延时
    return dat;
}


//读温度值（低位放tempL;高位放tempH;）
char DS18B20_ReadTemperature(char *pData, int Size)
{
    unsigned char TPH = 0;                     //存放温度值的高字节
    unsigned char TPL = 0;                     //存放温度值的低字节

    DS18B20_Reset();                    //设备复位
    DS18B20_WriteByte(SKIP_ROM);        //跳过ROM命令
    DS18B20_WriteByte(CONVERT_T);       //开始转换命令
    while (!DQ);                        //等待转换完成

    DS18B20_Reset();                    //设备复位
    DS18B20_WriteByte(SKIP_ROM);        //跳过ROM命令
    DS18B20_WriteByte(READ_SCRATCHPAD); //读暂存存储器命令
    TPL = DS18B20_ReadByte();           //读温度低字节
    TPH = DS18B20_ReadByte();           //读温度高字节
    pData[0] =  (TPL >> 4) + (TPH << 4);    //返回整数部分
    pData[1] = ((TPL&0X08)>>3)*50+ ((TPL&0X04)>>2)*25 ;
    return pData[0];
}

//读温度值（低位放tempL;高位放tempH;）
char DS18B20_Read_ROM_Temperature(char *pID, int IDSize, char *pData, int Size)
{
    unsigned char TPH = 0;                     //存放温度值的高字节
    unsigned char TPL = 0;                     //存放温度值的低字节
    unsigned char i = 0;

    DS18B20_Reset();                    //设备复位
    DS18B20_WriteByte(SKIP_ROM);        //跳过ROM命令
    DS18B20_WriteByte(CONVERT_T);       //开始转换命令
    while (!DQ);                        //等待转换完成

    DS18B20_Reset();                    //设备复位
    DS18B20_WriteByte(MATH_ROM);        //跳过ROM命令
    for(i = 0; i < IDSize; i++)              //发送8个字节的序列号
    {
        DS18B20_WriteByte(pID[i]);
    }

    DS18B20_WriteByte(READ_SCRATCHPAD); //读暂存存储器命令
    TPL = DS18B20_ReadByte();           //读温度低字节
    TPH = DS18B20_ReadByte();           //读温度高字节
    pData[0] =  (TPL >> 4) + (TPH << 4);    //返回整数部分
    pData[1] = ((TPL&0X08)>>3)*50+ ((TPL&0X04)>>2)*25 ;
    return pData[0];
}


/* 遍历搜索单线上所连的所有18b20的序列号 */
unsigned char DS18B20_Search_Rom()
{
    unsigned char  i = 0;
    unsigned char  aByte = 0;
    unsigned char  num = 0;
    unsigned char  Stack[10];
    unsigned char  StackTop;
    unsigned char  Way;
    unsigned char  MarkTheWay[8];                 //记住每个分支点的上一次走向

    bit FirstBit;
    bit SecondBit;

    StackTop = 0;        /* 栈的初始化 */
    Stack[StackTop] = 0; /* 栈底初始化 */
    num = 0;
    do
    {
        DS18B20_Reset();
        DS18B20_WriteByte(SEARCH_ROM);
        i=0;
        while(++i)                              //起始值大于栈底的0， 直到总线无响应
        {
            aByte >>= 1;                        //首先把最高位让出来， 最高位会默认补0
            FirstBit  = DS18B20_read_bit();
            SecondBit = DS18B20_read_bit();

            if(1 == FirstBit && 1 == SecondBit) //第1种情况, 总线无应答
            {
                num++;
                break ;
            }
            if(0 == FirstBit && 1 == SecondBit) //第3种情况，代表0
            {
                aByte |= 0X00;                  //此语句运行无意义， 仅仅为了方便阅读理解
                DS18B20_write_bit(0);
            }
            if(1 == FirstBit && 0 == SecondBit) //第2种情况，代表1
            {
                aByte |= 0X80;
                DS18B20_write_bit(1);
            }
            if(0 == FirstBit && 0 == SecondBit) //第4种情况，既有 0 又有 1
            {
                if( i > Stack[StackTop])         //如果是新的冲突标记，
                {
                    Stack[++StackTop] = i;       //入栈
                    aByte |= 0X00;               //此语句运行无意义， 仅仅为了方便阅读理解
                    DS18B20_write_bit(0);                //向 0 方向的分支走
                    SetBit(MarkTheWay, sizeof(MarkTheWay), i, 0);// 记住本次在分支 i 的走向
                }
                else if( i == Stack[StackTop])   //说明这不是新的冲突且这是栈顶
                {
                    StackTop--;                  //出栈
                    aByte |= 0X80;
                    DS18B20_write_bit(1);                //向 1 方向的分支走
                    SetBit(MarkTheWay, sizeof(MarkTheWay), i, 1);
                }

                else if( i < Stack[StackTop])    //这说明这是靠近根分支的冲突
                {
                    Way = GetBit(MarkTheWay, sizeof(MarkTheWay), i);//取出原先的走法
                    aByte |= (Way << 7);
                    DS18B20_write_bit(Way);         //按照 之前 方向的分支走
                }
            }
            if(i%8==0)
            {
                SendHEX(aByte);
            }
            if(i >= 64)
            {
                SendLR();
            }
        }
    }while(Stack[StackTop] != 0);
    return num;
}

sys.h

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#include "INTRINS.H"

void Delay500us()       //@11.0592MHz
{
    unsigned char i, j;

    i = 6;
    j = 93;
    do
    {
        while (--j);
    } while (--i);
}

void Delay1us()     //@11.0592MHz
{
    _nop_();
}

void Delay60us()        //@11.0592MHz
{
    unsigned char i, j;

    _nop_();
    _nop_();
    i = 1;
    j = 161;
    do
    {
        while (--j);
    } while (--i);
}

void Delay500ms()       //@11.0592MHz
{
    unsigned char i, j, k;

    i = 22;
    j = 3;
    k = 227;
    do
    {
        do
        {
            while (--k);
        } while (--j);
    } while (--i);
}

void SetBit(unsigned char* pData, unsigned int DataSize, unsigned int bits, unsigned int flag)
{
    unsigned char Magic;
    Magic = 1 << (bits % 8);
    if (flag)
    {
        pData[bits/8] |= Magic;
    }
    else
    {
        pData[bits/8] &= ~Magic;
    }
}

bit GetBit(unsigned char* pData, unsigned int DataSize, unsigned int bits)
{
    return 0x01 & (pData[bits/8] >> (bits%8));
}

uart.h

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#include "reg51.h"

//#define BAUD  0xF400                  // 1200bps @ 11.0592MHz
//#define BAUD  0xFA00                  // 2400bps @ 11.0592MHz
//#define BAUD  0xFD00                  // 4800bps @ 11.0592MHz
#define BAUD  0xFE80                  // 9600bps @ 11.0592MHz
//#define BAUD  0xFF40                  //19200bps @ 11.0592MHz
//#define BAUD  0xFFA0                    //38400bps @ 11.0592MHz


sfr AUXR = 0x8E;
sbit RXB = P3^0;
sbit TXB = P3^1;

typedef bit BOOL;
typedef unsigned char BYTE;
typedef unsigned int WORD;

BYTE TBUF,RBUF;
BYTE TDAT,RDAT;
BYTE TCNT,RCNT;
BYTE TBIT,RBIT;
BOOL TING,RING;
BOOL TEND,REND;

void UART_INIT();

BYTE t, r;
BYTE buf[16];

//-----------------------------------------
//Timer interrupt routine for UART

void tm0() interrupt 1
{
    if (RING)
    {
        if (--RCNT == 0)
        {
            RCNT = 3;                   //reset send baudrate counter
            if (--RBIT == 0)
            {
                RBUF = RDAT;            //save the data to RBUF
                RING = 0;               //stop receive
                REND = 1;               //set receive completed flag
            }
            else
            {
                RDAT >>= 1;
                if (RXB)
                    RDAT |= 0x80;  //shift RX data to RX buffer
            }
        }
    }
    else if (!RXB)
    {
        RING = 1;                       //set start receive flag
        RCNT = 4;                       //initial receive baudrate counter
        RBIT = 9;                       //initial receive bit number (8 data bits + 1 stop bit)
    }

    if (--TCNT == 0)
    {
        TCNT = 3;                       //reset send baudrate counter
        if (TING)                       //judge whether sending
        {
            if (TBIT == 0)
            {
                TXB = 0;                //send start bit
                TDAT = TBUF;            //load data from TBUF to TDAT
                TBIT = 9;               //initial send bit number (8 data bits + 1 stop bit)
            }
            else
            {
                TDAT >>= 1;             //shift data to CY
                if (--TBIT == 0)
                {
                    TXB = 1;
                    TING = 0;           //stop send
                    TEND = 1;           //set send completed flag
                }
                else
                {
                    TXB = CY;           //write CY to TX port
                }
            }
        }
    }
}

void UART_INIT()
{
    TMOD = 0x00;                        //timer0 in 16-bit auto reload mode
    AUXR = 0x80;                        //timer0 working at 1T mode
    TL0 = BAUD;
    TH0 = BAUD>>8;                      //initial timer0 and set reload value
    TR0 = 1;                            //tiemr0 start running
    ET0 = 1;                            //enable timer0 interrupt
    PT0 = 1;                            //improve timer0 interrupt priority
    EA = 1;                             //open global interrupt switch

    TING = 0;
    RING = 0;
    TEND = 1;
    REND = 0;
    TCNT = 0;
    RCNT = 0;
}

void SendByte(char aByte)
{
    while(!TEND);
    TEND = 0;
    TBUF = aByte;
    TING = 1;
}
char RecvByte()
{
    while(!REND);
    REND = 0;
    return RBUF;
}

void SendData(char* pData, int len)
{
    int i;
    for(i=0; i<len; i++)
    {
        SendByte(pData[i]);
    }
}
void SendHEX(unsigned char Data)
{
    unsigned char highByte = (Data >> 4);
    unsigned char lowByte = (Data & 0X0F);

    highByte += 0x30;
    if (highByte > 0x39)
    {
             SendByte(highByte + 0x07);
    }
    else
    {
             SendByte(highByte);
    }

    lowByte += 0x30;
    if (lowByte > 0x39)
    {
        SendByte(lowByte + 0x07);
    }
    else
    {
         SendByte(lowByte);
    }
}



void SendLR()
{
    SendByte('\r');
    SendByte('\n');
}

void SendStr(char* pData)
{
    int i = 0;;
    while(pData[i] != '\0')
    {
        SendByte(pData[i++]);
    }
}





//void main()
//{
//    char aByte;
//    UART_INIT();

//    while (1)
//    {                                   //user's function
//        aByte = RecvByte();
//        SendByte(aByte);
//    }
//}

STARTUP.A51

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$NOMOD51
;------------------------------------------------------------------------------
;  This file is part of the C51 Compiler package
;  Copyright (c) 1988-2005 Keil Elektronik GmbH and Keil Software, Inc.
;  Version 8.01
;
;  *** <<< Use Configuration Wizard in Context Menu >>> ***
;------------------------------------------------------------------------------
;  STARTUP.A51:  This code is executed after processor reset.
;
;  To translate this file use A51 with the following invocation:
;
;     A51 STARTUP.A51
;
;  To link the modified STARTUP.OBJ file to your application use the following
;  Lx51 invocation:
;
;     Lx51 your object file list, STARTUP.OBJ  controls
;
;------------------------------------------------------------------------------
;
;  User-defined <h> Power-On Initialization of Memory
;
;  With the following EQU statements the initialization of memory
;  at processor reset can be defined:
;
; <o> IDATALEN: IDATA memory size <0x0-0x100>
;     <i> Note: The absolute start-address of IDATA memory is always 0
;     <i>       The IDATA space overlaps physically the DATA and BIT areas.
IDATALEN        EQU     80H
;
; <o> XDATASTART: XDATA memory start address <0x0-0xFFFF>
;     <i> The absolute start address of XDATA memory
XDATASTART      EQU     0
;
; <o> XDATALEN: XDATA memory size <0x0-0xFFFF>
;     <i> The length of XDATA memory in bytes.
XDATALEN        EQU     0
;
; <o> PDATASTART: PDATA memory start address <0x0-0xFFFF>
;     <i> The absolute start address of PDATA memory
PDATASTART      EQU     0H
;
; <o> PDATALEN: PDATA memory size <0x0-0xFF>
;     <i> The length of PDATA memory in bytes.
PDATALEN        EQU     0H
;
;</h>
;------------------------------------------------------------------------------
;
;<h> Reentrant Stack Initialization
;
;  The following EQU statements define the stack pointer for reentrant
;  functions and initialized it:
;
; <h> Stack Space for reentrant functions in the SMALL model.
;  <q> IBPSTACK: Enable SMALL model reentrant stack
;     <i> Stack space for reentrant functions in the SMALL model.
IBPSTACK        EQU     0       ; set to 1 if small reentrant is used.
;  <o> IBPSTACKTOP: End address of SMALL model stack <0x0-0xFF>
;     <i> Set the top of the stack to the highest location.
IBPSTACKTOP     EQU     0xFF +1     ; default 0FFH+1
; </h>
;
; <h> Stack Space for reentrant functions in the LARGE model.
;  <q> XBPSTACK: Enable LARGE model reentrant stack
;     <i> Stack space for reentrant functions in the LARGE model.
XBPSTACK        EQU     0       ; set to 1 if large reentrant is used.
;  <o> XBPSTACKTOP: End address of LARGE model stack <0x0-0xFFFF>
;     <i> Set the top of the stack to the highest location.
XBPSTACKTOP     EQU     0xFFFF +1   ; default 0FFFFH+1
; </h>
;
; <h> Stack Space for reentrant functions in the COMPACT model.
;  <q> PBPSTACK: Enable COMPACT model reentrant stack
;     <i> Stack space for reentrant functions in the COMPACT model.
PBPSTACK        EQU     0       ; set to 1 if compact reentrant is used.
;
;   <o> PBPSTACKTOP: End address of COMPACT model stack <0x0-0xFFFF>
;     <i> Set the top of the stack to the highest location.
PBPSTACKTOP     EQU     0xFF +1     ; default 0FFH+1
; </h>
;</h>
;------------------------------------------------------------------------------
;
;  Memory Page for Using the Compact Model with 64 KByte xdata RAM
;  <e>Compact Model Page Definition
;
;  <i>Define the XDATA page used for PDATA variables.
;  <i>PPAGE must conform with the PPAGE set in the linker invocation.
;
; Enable pdata memory page initalization
PPAGEENABLE     EQU     0       ; set to 1 if pdata object are used.
;
; <o> PPAGE number <0x0-0xFF>
; <i> uppermost 256-byte address of the page used for PDATA variables.
PPAGE           EQU     0
;
; <o> SFR address which supplies uppermost address byte <0x0-0xFF>
; <i> most 8051 variants use P2 as uppermost address byte
PPAGE_SFR       DATA    0A0H
;
; </e>
;------------------------------------------------------------------------------

; Standard SFR Symbols
ACC     DATA    0E0H
B       DATA    0F0H
SP      DATA    81H
DPL     DATA    82H
DPH     DATA    83H

                NAME    ?C_STARTUP


?C_C51STARTUP   SEGMENT   CODE
?STACK          SEGMENT   IDATA

                RSEG    ?STACK
                DS      1

                EXTRN CODE (?C_START)
                PUBLIC  ?C_STARTUP

                CSEG    AT      0
?C_STARTUP:     LJMP    STARTUP1

                RSEG    ?C_C51STARTUP

STARTUP1:

IF IDATALEN <> 0
                MOV     R0,#IDATALEN - 1
                CLR     A
IDATALOOP:      MOV     @R0,A
                DJNZ    R0,IDATALOOP
ENDIF

IF XDATALEN <> 0
                MOV     DPTR,#XDATASTART
                MOV     R7,#LOW (XDATALEN)
  IF (LOW (XDATALEN)) <> 0
                MOV     R6,#(HIGH (XDATALEN)) +1
  ELSE
                MOV     R6,#HIGH (XDATALEN)
  ENDIF
                CLR     A
XDATALOOP:      MOVX    @DPTR,A
                INC     DPTR
                DJNZ    R7,XDATALOOP
                DJNZ    R6,XDATALOOP
ENDIF

IF PPAGEENABLE <> 0
                MOV     PPAGE_SFR,#PPAGE
ENDIF

IF PDATALEN <> 0
                MOV     R0,#LOW (PDATASTART)
                MOV     R7,#LOW (PDATALEN)
                CLR     A
PDATALOOP:      MOVX    @R0,A
                INC     R0
                DJNZ    R7,PDATALOOP
ENDIF

IF IBPSTACK <> 0
EXTRN DATA (?C_IBP)

                MOV     ?C_IBP,#LOW IBPSTACKTOP
ENDIF

IF XBPSTACK <> 0
EXTRN DATA (?C_XBP)

                MOV     ?C_XBP,#HIGH XBPSTACKTOP
                MOV     ?C_XBP+1,#LOW XBPSTACKTOP
ENDIF

IF PBPSTACK <> 0
EXTRN DATA (?C_PBP)
                MOV     ?C_PBP,#LOW PBPSTACKTOP
ENDIF

                MOV     SP,#?STACK-1

; This code is required if you use L51_BANK.A51 with Banking Mode 4
;<h> Code Banking
; <q> Select Bank 0 for L51_BANK.A51 Mode 4
#if 0
;     <i> Initialize bank mechanism to code bank 0 when using L51_BANK.A51 with Banking Mode 4.
EXTRN CODE (?B_SWITCH0)
                CALL    ?B_SWITCH0      ; init bank mechanism to code bank 0
#endif
;</h>
                LJMP    ?C_START

                END