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#include
#include
#define?? BUSY1??? (DQ1==0)
sbit????? DQ1??? =? P0^4;
unsigned char idata TMP;
unsigned char idata TMP_d;
unsigned char f;
void wr_ds18_1(char dat);
unsigned char rd_ds18_1();
/***************延時程序，單位us,大于10us*************/
void time_delay(unsigned char time)
{
?
??time=time-10;
??time=time/6;
??while(time!=0)time--;
}
/*****************************************************/
/*??????????????? reset ds18b20????????????????????? */
/*****************************************************/
void ds_reset_1(void)
{
??unsigned char idata count=0;?
??DQ1=0;
? ?time_delay(240);
?time_delay(240);
??DQ1=1;
??return;
}
void check_pre_1(void)
{
??? ?while(DQ1);
??? ?while(~DQ1);
??
???????? time_delay(30);
}
void read_ROM(void)
{
?int n;
?ds_reset_1();
??check_pre_1();
??wr_ds18_1(0x33);
??for(n=0;n<8;n++){ROM[n]=rd_ds18_1();}??
}
/*****************************************************/
/*????? Read a bit from 1820????? 位讀取???????????? */
/*****************************************************/
bit tmrbit_1(void)
{
??????? idata char i=0;
??? ?bit dat;
??? ?
??? ?DQ1=0;_nop_();
? ?
??????? DQ1=1;
???????
? ?_nop_();
? ?_nop_();
? ?_nop_();
?_nop_();
??_nop_();
? ?_nop_();
? ?_nop_();
? ?_nop_();
??????? _nop_();
??_nop_();
? ?_nop_();
? ?_nop_();
? ?_nop_();
? ?_nop_();
?
? ?
??? ?dat = DQ1;
??? ?
??????? time_delay(50);
?????
??? ?return dat;
}
/*****************************************************/
/*??????????????? read a bety from ds18b20 字節讀取? */
/*****************************************************/
unsigned char rd_ds18_1()
{
??unsigned char idata i,j,dat=0;
??? ?for(i=1;i<=8;i++)
??? ?{
??????? ?j=tmrbit_1();
??????? ?dat=(j<<(i-1))|dat;
??? ?}
??? ?return dat;
}
/*****************************************************/
/*???????? write a bety from ds18b20?? 寫字節??????? */
/****************************************************/
void wr_ds18_1(char dat)
{
??? ?signed char? idata i=0;
??? ?unsigned char idata j;
??? ?bit testb;
??? ?for(j=1;j<=8;j++)
??? ?{
??????? ?testb=dat & 0x01;
??????? ?dat = dat>>1;
??????? ?if(testb)
??????? ?{
??????????? ??DQ1=0;
???????????? ??_nop_();
??? ???_nop_();
??????????? ??DQ1=1;
????????? ??time_delay(60);??
?????????? ?}
??????? ?
??????? ?else
??????? ?{
??????????? ??DQ1=0;
??????????? ??time_delay(50);
??????????????????
??????????? ??DQ1=1;
???????????? ??_nop_();
??? ???_nop_();
??????? ?}
??? ?}
}
int get_temp_1(void)
{
??unsigned char idata a=0,b=0;
??unsigned char idata i;
??EA=0;
??
??ds_reset_1();
??check_pre_1();
??
??wr_ds18_1(0xcc);??????????????????
??wr_ds18_1(0x44);????? ?
??while(BUSY1);
??
??ds_reset_1();
??check_pre_1();
??wr_ds18_1(0xcc);????????????????
??wr_ds18_1(0xbe);?????????????????
??
??a=rd_ds18_1();
??b=rd_ds18_1();
??
??i=b;?? /*若b為1則為負溫?? */
??i=(i>>4);
??if(i==0)
??{
???f=0;
???TMP=((a>>4)|(b<<4));
??a=(a&0x0f);
??if (a>8)
??{
???TMP=(TMP+1);
??}
??}
??else
??{
???f=1;
??a=a>>4;
???b=b<<4;
??? ??
???TMP=(a|b);
???
???TMP=~TMP;
???TMP=(TMP+1);
??}
??EA=1;
??return(TMP);
}
??
?
int get_temp_d(void)
{
??unsigned char idata a=0,b=0;
??unsigned char idata i,m;
??EA=0;
??
??ds_reset_1();//復位
??check_pre_1();
??
??wr_ds18_1(0xcc);???????
??wr_ds18_1(0x44);????? ?
??while(BUSY1);
??
??ds_reset_1();
??check_pre_1();
??wr_ds18_1(0xcc);???????
??wr_ds18_1(0xbe);???????
??
??a=rd_ds18_1();
??b=rd_ds18_1();
??
??
??i=b;?? /*若b為1則為負溫?? */
??i=(i>>4);
??
??if(i==0)
??{
???f=0;
???TMP=((a>>4)|(b<<4));
??a=(a&0x0f);
??TMP_d=a;
??}
??else
??{
???f=1;
???a=~a;
???a=(a+1);
???b=~b;
???b=(b+1);
???
???m=a;
???a=a>>4;
???b=b<<4;
??? ??
???TMP=(a|b); ??
???m=(m&0x0f);
???TMP_d=m;
??}
??
??EA=1;
??return(TMP);
}
???
?
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