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//頭文件包含
#include <AT89X51.H>
#include <Intrins.h>
#include "DS18B20.H"
//引腳定義
sbit DQ = P2^7; //數據線端口
//DS18B20序列號,通過調用GetROMSequence()函數在P1口讀出(讀8次)
const unsigned char code ROMData1[8] = {0x28, 0x33, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0xD7}; //U1
const unsigned char code ROMData2[8] = {0x28, 0x30, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x8E}; //U2
const unsigned char code ROMData3[8] = {0x28, 0x31, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0xB9}; //U3
const unsigned char code ROMData4[8] = {0x28, 0x32, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0xE0}; //U4
const unsigned char code ROMData5[8] = {0x28, 0x34, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x52}; //U5
const unsigned char code ROMData6[8] = {0x28, 0x35, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x65}; //U6
const unsigned char code ROMData7[8] = {0x28, 0x36, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x3C}; //U7
const unsigned char code ROMData8[8] = {0x28, 0x37, 0xC5, 0xB8, 0x00, 0x00, 0x00, 0x0B}; //U8
//延時16us子函數
void Delay16us()
{
unsigned char a;
for (a = 0; a < 4; a++);
}
//延時60us子函數
void Delay60us()
{
unsigned char a;
for (a = 0; a < 18; a++);
}
//延時480us子函數
void Delay480us()
{
unsigned char a;
for (a = 0; a < 158; a++);
}
//延時240us子函數
void Delay240us()
{
unsigned char a;
for (a = 0; a < 78; a++);
}
//延時500ms子函數
void Delay500ms()
{
unsigned char a, b, c;
for (a = 0; a < 250; a++)
for (b = 0; b < 3; b++)
for (c = 0; c < 220; c++);
}
//芯片初始化
void Initialization()
{
while(1)
{
DQ = 0;
Delay480us(); //延時480us
DQ = 1;
Delay60us(); //延時60us
if(!DQ) //收到ds18b20的應答信號
{
DQ = 1;
Delay240us(); //延時240us
break;
}
}
}
//寫一個字節(從低位開始寫)
void WriteByte(unsigned char btData)
{
unsigned char i, btBuffer;
for (i = 0; i < 8; i++)
{
btBuffer = btData >> i;
if (btBuffer & 1)
{
DQ = 0;
_nop_();
_nop_();
DQ = 1;
Delay60us();
}
else
{
DQ = 0;
Delay60us();
DQ = 1;
}
}
}
//讀一個字節(從低位開始讀)
unsigned char ReadByte()
{
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;
}
//序列號匹配
void MatchROM(const unsigned char *pMatchData)
{
unsigned char i;
Initialization();
WriteByte(MATCH_ROM);
for (i = 0; i < 8; i++) WriteByte(*(pMatchData + i));
}
//得到64位ROM序列(在P1口顯示,必須與Proteus聯調且在單步調試下才能得到)
/*void GetROMSequence()
{
unsigned char i;
Initialization();
WriteByte(READ_ROM);
for (i = 0; i < 8; i++)
P1 = ReadByte();
}*/
//讀取溫度值
TEMPDATA ReadTemperature()
{
TEMPDATA TempData;
unsigned int iTempDataH;
unsigned char btDot, iTempDataL;
static unsigned char i = 0;
TempData.btNegative = 0; //為0溫度為正
i++;
if (i == 9) i = 1;
Initialization();
WriteByte(SKIP_ROM); //跳過ROM匹配
WriteByte(TEMP_SWITCH); //啟動轉換
Delay500ms(); //調用一次就行
Delay500ms();
Initialization();
//多個芯片的時候用MatchROM(ROMData)換掉WriteByte(SKIP_ROM)
switch (i)
{
case 1 : MatchROM(ROMData1); break; //匹配1
case 2 : MatchROM(ROMData2); break; //匹配2
case 3 : MatchROM(ROMData3); break; //匹配3
case 4 : MatchROM(ROMData4); break; //匹配4
case 5 : MatchROM(ROMData5); break; //匹配5
case 6 : MatchROM(ROMData6); break; //匹配6
case 7 : MatchROM(ROMData7); break; //匹配7
case 8 : MatchROM(ROMData8); break; //匹配8
}
//WriteByte(SKIP_ROM); //跳過ROM匹配(單個芯片時用這句換掉上面的switch)
WriteByte(READ_MEMORY); //讀數據
iTempDataL = ReadByte();
iTempDataH = ReadByte();
iTempDataH <<= 8;
iTempDataH |= iTempDataL;
if (iTempDataH & 0x8000)
{
TempData.btNegative = 1;
iTempDataH = ~iTempDataH + 1; //負數求補
}
//為了省去浮點運算帶來的開銷，而采用整數和小數部分分開處理的方法(沒有四舍五入)
btDot = (unsigned char)(iTempDataH & 0x000F); //得到小數部分
iTempDataH >>= 4; //得到整數部分
btDot *= 5; //btDot*10/16得到轉換后的小數數據
btDot >>= 3;
//數據處理
TempData.btThird = (unsigned char)iTempDataH / 100;
TempData.btSecond = (unsigned char)iTempDataH % 100 / 10;
TempData.btFirst = (unsigned char)iTempDataH % 10;
TempData.btDecimal = btDot;
return TempData;
}

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