2019-03-24 16:55发布
doublezz 发表于 2018-12-26 15:58 #include #define uchar unsigned char #define uint unsigned int sbit DQ=P3^7;//ds18b20与单片机连接 ...
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//下面是测试过的DS18B20的程序
uchar shuju[2];
uchar i;
int t = 0;
sbit DQ = P1^0; //óÃóú′®¿ú·¢Ëí¼°1¤×÷×′ì¬Ö¸ê¾
BYTE TPH; //′æ·ÅζèÖμμĸß×Ö½ú
BYTE TPL; //′æ·ÅζèÖμμÄμí×Ö½ú
void DelayXus(BYTE n);
void DS18B20_Reset();
void DS18B20_WriteByte(BYTE dat);
BYTE DS18B20_ReadByte();
void delay(uint x)//Ñóê±
{
uint a,b;
for(a=0;a<200;a++)
for(b=x;b>0;b--);
}
uchar get_AD_result(uchar channel)
{
uchar AD_finished = 0; // ′æ′¢ A/D ×a»»±êÖ¾
ADC_DATA = 0;
ADC_CONTR = channel; // Ñ¡Ôñ A/D μ±Ç°í¨μà?
//ê1êäèëμçÑ1′ïμ½Î趨
ADC_CONTR |= 0x88; //1000,1000 áî ADC_START = 1, Æô¶ˉA/D ×a»»
delay(1);
AD_finished = 0;
while ( AD_finished == 0 ) // μè′yA/D ×a»»½áêø
{ AD_finished = (ADC_CONTR & 0x10); //0001,0000, ADC_FLAG ==12aêÔA/D×a»»½áêø·ñ
}
ADC_CONTR &=0x80; //10000000 áî ADC_START = 0, 1رÕA/D ×a»»
return (ADC_DATA); // ·μ»Ø A/D ×a»»½á1û
}
int get_temper()//¶áζè′«¸DÆ÷
{
unsigned int temp;
unsigned int wen;
DS18B20_Reset(); //é豸¸′λ
DS18B20_WriteByte(0xCC); //ìø1yROMÃüáî
DS18B20_WriteByte(0x44); //¿aê¼×a»»Ãüáî
while (!DQ); //μè′y×a»»íê3é
DS18B20_Reset(); //é豸¸′λ
DS18B20_WriteByte(0xCC); //ìø1yROMÃüáî
DS18B20_WriteByte(0xBE); //¶áÔY′æ′æ′¢Æ÷Ãüáî
TPL = DS18B20_ReadByte(); //¶áζèμí×Ö½ú
TPH = DS18B20_ReadByte(); //¶áζè¸ß×Ö½ú
/* temp=(TPH<<8)|TPL; //oÏ2¢
if(TPH>200) temp=~temp+1;
wen=(temp*6/10)+(temp*2/100)+(temp*5/1000); //×a»»*/
if(!t){
temp = TPL;
t = 1;
}
else{
temp = TPH;
t = 0;
}
return(temp); //·μ»Øζè
}
/**************************************
Ñóê±X΢Ãë(STC12C5A60S2@5.2M)
2»í¬μÄ1¤×÷»·¾3,Dèòaμ÷Õû′Ëoˉêy
′ËÑóê±oˉêyêÇê1óÃ1TμÄÖ¸áîÖüÆú½øDD¼ÆËã,óë′«í3μÄ12TμÄMCU2»í¬
**************************************/
void DelayXus(BYTE n)
{
while (n--)
{
_nop_();
}
}
void inint_ser()//3õê¼»ˉ′®¿ú,2¨ìØÂê9600
{
TMOD=0x20;
TH1=0xfd;
TL1=0xfd;
REN=1;
TR1=1;
ES=1;
EA=1;
SM0=0;
SM1=1;
PCON=0X80;
}
/**************************************
¸′λDS18B20,2¢¼ì2aé豸êÇ·ñ′æÔú
**************************************/
void DS18B20_Reset()
{
CY = 1;
while (CY)
{
DQ = 0; //Ëí3öμíμçƽ¸′λDÅoÅ
DelayXus(180); //Ñóê±Öáéù480us
DelayXus(180);
DQ = 1; //êí·Åêy¾YÏß
DelayXus(40); //μè′y60us
CY = DQ; //¼ì2a′æÔúÂö3å
DelayXus(200); //μè′yé豸êí·Åêy¾YÏß
DelayXus(150);
}
}
/**************************************
′óDS18B20¶á1×Ö½úêy¾Y
**************************************/
BYTE DS18B20_ReadByte()
{
BYTE i;
BYTE dat = 0;
for (i=0; i<8; i++) //8λ¼ÆêyÆ÷
{
dat >>= 1;
DQ = 0; //¿aê¼ê±¼äƬ
DelayXus(0); //Ñóê±μè′y
DQ = 1; //×¼±¸½óêÕ
DelayXus(0); //½óêÕÑóê±
if (DQ) dat |= 0x80; //¶áè¡êy¾Y
DelayXus(40); //μè′yê±¼äƬ½áêø
}
return dat;
}
/**************************************
ÏòDS18B20D′1×Ö½úêy¾Y
**************************************/
void DS18B20_WriteByte(BYTE dat)
{
char i;
for (i=0; i<8; i++) //8λ¼ÆêyÆ÷
{
DQ = 0; //¿aê¼ê±¼äƬ
DelayXus(0); //Ñóê±μè′y
dat >>= 1; //Ëí3öêy¾Y
DQ = CY;
DelayXus(40); //μè′yê±¼äƬ½áêø
DQ = 1; //»Ö¸′êy¾YÏß
DelayXus(0); //»Ö¸′Ñóê±
}
}
void send_data(uchar x)
{
ES=0;
SBUF=shuju[x];
delay(20);
while(!TI);
TI=0;
ES=1;
}
void send_dataA()
{
ES=0;
SBUF=0xAA;
delay(20);
while(!TI);
TI=0;
ES=1;
}
void send_dataB()
{
ES=0;
SBUF=0xBB;
delay(20);
while(!TI);
TI=0;
ES=1;
}
void main()
{
int k;
inint_ser();
P1M0=0XFF;
P1M1=0xFF;
P1=0XFF;
while(1)
{
send_dataA();
for(k = 0;k < 2;k++)
{
shuju[k]=get_temper();
send_data(k);
}
send_dataB();
delay(100);
}
}
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