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C語言源程序：
?
#include
code unsigned char seg7code[11]={0x3f,0x06,0x5b,0x4f,0x66,
???????????????????????????????? 0x6d,0x7d,0x07,0x7f,0x6f,0x40}; //顯示段碼
void Delay(unsigned int tc)???? //顯示延時程序
{while( tc != 0 )?
?{unsigned int i;?
? for(i=0; i<100; i++);
? tc--;}
}
sbit TMDAT =P3^1; //DS18B20的數(shù)據(jù)輸入/輸出腳DQ,根據(jù)情況設(shè)定
unsigned int sdata;//測量到的溫度的整數(shù)部分
unsigned char xiaoshu1;//小數(shù)第一位
unsigned char xiaoshu2;//小數(shù)第二位
unsigned char xiaoshu;//兩位小數(shù)
bit? fg=1;??????? //溫度正負(fù)標(biāo)志
void dmsec (unsigned int count)?????? //延時部分
?{???
?unsigned char i;
?while(count--)
?{for(i=0;i<115;i++);}?
?}?????????
void tmreset (void)?????? //發(fā)送復(fù)位
{???????????????????????????????
?unsigned char i;
?TMDAT=0;?? for(i=0;i<103;i++);???
?TMDAT = 1; for(i=0;i<4;i++);???????
}?????????
bit tmrbit (void)?????? //讀一位//
?{???????????????????????????
? unsigned int i;???????
? bit dat;??????
? TMDAT = 0;
? i++;???????
? TMDAT = 1;?
? i++; i++;? //微量延時?? //
? dat = TMDAT;?????
?for(i=0;i<8;i++);?
? return (dat);??????
?}?????????
unsigned char tmrbyte (void)??????? //讀一個字節(jié)
? {?????????????????
? unsigned char i,j,dat;??????
? dat = 0;???????
? for (i=1;i<=8;i++)??????
? { j = tmrbit();? dat = (j << 7) | (dat >> 1); }?????????
?? return (dat);???
}?????????
void tmwbyte (unsigned char dat)???? //寫一個字節(jié)
{???????????????????????
? unsigned char j,i;??????
? bit testb;???????
? for (j=1;j<=8;j++)??????
? { testb = dat & 0x01;?????
?? dat = dat >> 1;??????
?? if (testb)?????
?? {?? TMDAT = 0;???????? //寫0??
???? i++; i++;??????????????????????????????
??? TMDAT = 1;????
??? for(i=0;i<8;i++); }
??????????
?? else???????
? {? TMDAT = 0;???????? //寫0?
???? for(i=0;i<8;i++);?
??TMDAT = 1;?????
???? i++; i++;}???????????????????????????????
}????????
}??
void tmstart (void)?????? //發(fā)送ds1820 開始轉(zhuǎn)換
? {? tmreset();? //復(fù)位?????
??dmsec(1);? //延時????
??tmwbyte(0xcc);? //跳過序列號命令???
??tmwbyte(0x44);? //發(fā)轉(zhuǎn)換命令 44H,
? }?????????
void tmrtemp (void)?????? //讀取溫度
??? {??????????????????????????
??unsigned char a,b;?
??tmreset ();? //復(fù)位?????
??dmsec (1);? //延時?????
??tmwbyte (0xcc);? //跳過序列號命令???
??tmwbyte (0xbe);? //發(fā)送讀取命令?????
??a = tmrbyte ();? //讀取低位溫度????
??b = tmrbyte ();?? //讀取高位溫度???????????
??if(b>0x7f)????? //最高位為1時溫度是負(fù)
??{a=~a;?? b=~b+1;?????? //補(bǔ)碼轉(zhuǎn)換，取反加一
?? fg=0;????? //讀取溫度為負(fù)時fg=0
?????? }
??sdata = a/16+b*16;????? //整數(shù)部分
??xiaoshu1 = (a&0x0f)*10/16; //小數(shù)第一位
??xiaoshu2 = (a&0x0f)*100/16%10;//小數(shù)第二位
??xiaoshu=xiaoshu1*10+xiaoshu2; //小數(shù)兩位
}??
void DS18B20PRO(void)?????????
{? tmstart();??????
? //dmsec(5); ?//如果是不斷地讀取的話可以不延時 //
? tmrtemp(); ?//讀取溫度,執(zhí)行完畢溫度將存于TMP中 //
}???????????
void Led()
{?
?? if(fg==1)?? //溫度為正時顯示的數(shù)據(jù)
?? {?? P2=P2&0xef;?
??? P0=seg7code[sdata/10];?????????? //輸出十位數(shù)
??? Delay(8); P2=P2|0xf0; P2=P2&0xdf;??
??? P0=seg7code[sdata%10]|0x80; //輸出個位和小數(shù)點(diǎn)
??? Delay(8); P2=P2|0xf0; P2=P2&0xbf;?
??? P0=seg7code[xiaoshu1];?? //輸出小數(shù)點(diǎn)后第一位
??? Delay(8); P2=P2|0xf0; P2=P2&0x7f;?
??? P0=seg7code[xiaoshu2];?????? //輸出小數(shù)點(diǎn)后第二位
??? Delay(4); P2=P2|0xf0;
?? }
?? if(fg==0)? //溫度為負(fù)時顯示的數(shù)據(jù)
?? {?? P2=P2&0xef;?
??? P0=seg7code[11];?????????? //負(fù)號
??? Delay(8); P2=P2|0xf0; P2=P2&0xdf;??
??? P0=seg7code[sdata/10]|0x80; //輸出十位數(shù)
??? Delay(8); P2=P2|0xf0; P2=P2&0xbf;?
??? P0=seg7code[sdata%10];?? //輸出個位和小數(shù)點(diǎn)
??? Delay(8); P2=P2|0xf0; P2=P2&0x7f;?
??? P0=seg7code[xiaoshu1];?????? //輸出小數(shù)點(diǎn)后第一位
??? Delay(4); P2=P2|0xf0;
?? }
}
main()
{fg=1;
?while(1)
?{
? DS18B20PRO();
? Led();
?}
}
?
#include
code unsigned char seg7code[11]={0x3f,0x06,0x5b,0x4f,0x66,
???????????????????????????????? 0x6d,0x7d,0x07,0x7f,0x6f,0x40}; //顯示段碼
void Delay(unsigned int tc)???? //顯示延時程序
{while( tc != 0 )?
?{unsigned int i;?
? for(i=0; i<100; i++);
? tc--;}
}
sbit TMDAT =P3^1; //DS18B20的數(shù)據(jù)輸入/輸出腳DQ,根據(jù)情況設(shè)定
unsigned int sdata;//測量到的溫度的整數(shù)部分
unsigned char xiaoshu1;//小數(shù)第一位
unsigned char xiaoshu2;//小數(shù)第二位
unsigned char xiaoshu;//兩位小數(shù)
bit? fg=1;??????? //溫度正負(fù)標(biāo)志
void dmsec (unsigned int count)?????? //延時部分
?{???
?unsigned char i;
?while(count--)
?{for(i=0;i<115;i++);}?
?}?????????
void tmreset (void)?????? //發(fā)送復(fù)位
{???????????????????????????????
?unsigned char i;
?TMDAT=0;?? for(i=0;i<103;i++);???
?TMDAT = 1; for(i=0;i<4;i++);???????
}?????????
bit tmrbit (void)?????? //讀一位//
?{???????????????????????????
? unsigned int i;???????
? bit dat;??????
? TMDAT = 0;
? i++;???????
? TMDAT = 1;?
? i++; i++;? //微量延時?? //
? dat = TMDAT;?????
?for(i=0;i<8;i++);?
? return (dat);??????
?}?????????
unsigned char tmrbyte (void)??????? //讀一個字節(jié)
? {?????????????????
? unsigned char i,j,dat;??????
? dat = 0;???????
? for (i=1;i<=8;i++)??????
? { j = tmrbit();? dat = (j << 7) | (dat >> 1); }?????????
?? return (dat);???
}?????????
void tmwbyte (unsigned char dat)???? //寫一個字節(jié)
{???????????????????????
? unsigned char j,i;??????
? bit testb;???????
? for (j=1;j<=8;j++)??????
? { testb = dat & 0x01;?????
?? dat = dat >> 1;??????
?? if (testb)?????
?? {?? TMDAT = 0;???????? //寫0??
???? i++; i++;??????????????????????????????
??? TMDAT = 1;????
??? for(i=0;i<8;i++); }
??????????
?? else???????
? {? TMDAT = 0;???????? //寫0?
???? for(i=0;i<8;i++);?
??TMDAT = 1;?????
???? i++; i++;}???????????????????????????????
}????????
}??
void tmstart (void)?????? //發(fā)送ds1820 開始轉(zhuǎn)換
? {? tmreset();? //復(fù)位?????
??dmsec(1);? //延時????
??tmwbyte(0xcc);? //跳過序列號命令???
??tmwbyte(0x44);? //發(fā)轉(zhuǎn)換命令 44H,
? }?????????
void tmrtemp (void)?????? //讀取溫度
??? {??????????????????????????
??unsigned char a,b;?
??tmreset ();? //復(fù)位?????
??dmsec (1);? //延時?????
??tmwbyte (0xcc);? //跳過序列號命令???
??tmwbyte (0xbe);? //發(fā)送讀取命令?????
??a = tmrbyte ();? //讀取低位溫度????
??b = tmrbyte ();?? //讀取高位溫度???????????
??if(b>0x7f)????? //最高位為1時溫度是負(fù)
??{a=~a;?? b=~b+1;?????? //補(bǔ)碼轉(zhuǎn)換，取反加一
?? fg=0;????? //讀取溫度為負(fù)時fg=0
?????? }
??sdata = a/16+b*16;????? //整數(shù)部分
??xiaoshu1 = (a&0x0f)*10/16; //小數(shù)第一位
??xiaoshu2 = (a&0x0f)*100/16%10;//小數(shù)第二位
??xiaoshu=xiaoshu1*10+xiaoshu2; //小數(shù)兩位
}??
void DS18B20PRO(void)?????????
{? tmstart();??????
? //dmsec(5); ?//如果是不斷地讀取的話可以不延時 //
? tmrtemp(); ?//讀取溫度,執(zhí)行完畢溫度將存于TMP中 //
}???????????
void Led()
{?
?? if(fg==1)?? //溫度為正時顯示的數(shù)據(jù)
?? {?? P2=P2&0xef;?
??? P0=seg7code[sdata/10];?????????? //輸出十位數(shù)
??? Delay(8); P2=P2|0xf0; P2=P2&0xdf;??
??? P0=seg7code[sdata%10]|0x80; //輸出個位和小數(shù)點(diǎn)
??? Delay(8); P2=P2|0xf0; P2=P2&0xbf;?
??? P0=seg7code[xiaoshu1];?? //輸出小數(shù)點(diǎn)后第一位
??? Delay(8); P2=P2|0xf0; P2=P2&0x7f;?
??? P0=seg7code[xiaoshu2];?????? //輸出小數(shù)點(diǎn)后第二位
??? Delay(4); P2=P2|0xf0;
?? }
?? if(fg==0)? //溫度為負(fù)時顯示的數(shù)據(jù)
?? {?? P2=P2&0xef;?
??? P0=seg7code[11];?????????? //負(fù)號
??? Delay(8); P2=P2|0xf0; P2=P2&0xdf;??
??? P0=seg7code[sdata/10]|0x80; //輸出十位數(shù)
??? Delay(8); P2=P2|0xf0; P2=P2&0xbf;?
??? P0=seg7code[sdata%10];?? //輸出個位和小數(shù)點(diǎn)
??? Delay(8); P2=P2|0xf0; P2=P2&0x7f;?
??? P0=seg7code[xiaoshu1];?????? //輸出小數(shù)點(diǎn)后第一位
??? Delay(4); P2=P2|0xf0;
?? }
}
main()
{fg=1;
?while(1)
?{
? DS18B20PRO();
? Led();
?}
}
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