姹侫T89S52鏁板瓧娓╁害璁�{鐢―S18B20娓╁害浼犳劅鍣▆绋嬪簭

52鍗曠墖鏈� 18b20娓╁害浼犳劅鍣�绋嬪簭2009-11-05 18:20
#include<reg52.h>
#include<math.h>
#include<INTRINS.H>

#define uchar unsigned char
#define uint unsigned int

sbit DQ=P1^3; //ds18b20 绔�鍙�

uchar Temp_Integer=0;
uchar Temp_Decimal=0;
uchar fg=0;

void delay2(uint us)
{
while(us--);
}

uchar Init_DS18B20(void)
{
uchar x=0;
DQ = 1; //DQ澶嶄綅
delay2(8); //绋嶅仛寤舵椂
DQ = 0; //鍗曠墖鏈哄皢DQ鎷変綆
delay2(80); //绮剧‘寤舵椂 澶т簬480us
DQ = 1; //鎷夐珮鎬荤嚎
delay2(10);
x=DQ; //绋嶅仛寤舵椂鍚� 濡傛灉x=0鍒欏垵濮嬪寲鎴愬姛 x=1鍒欏垵濮嬪寲澶辫触
delay2(5);
return x;
}

uchar ReadOneChar(void) //璇讳竴涓�瀛楄妭,"LSB"
{
uchar i=0;
uchar dat = 0;
for (i=8;i>0;i--)
{
DQ = 0; // 缁欒剦鍐蹭俊鍙�
dat>>=1;
DQ = 1; // 缁欒剦鍐蹭俊鍙�
if(DQ)
dat|=0x80;
delay2(5);
}
return(dat);
}

void WriteOneChar(unsigned char dat) //鍐欎竴涓�瀛楄妭
{
uchar i=0;
for (i=8; i>0; i--)
{
DQ = 0;
DQ = dat&0x01;
delay2(5);
DQ = 1;
dat>>=1;
}
delay2(5);
}

/**********************DS18b20璇诲彇涓诲嚱鏁�,鏁翠釜娴佺▼5ms宸﹀彸************************/
uchar ReadTemperature(void) //璇诲彇娓╁害
{

uchar L_18B20=0;
uchar H_18B20=0;


Init_DS18B20();
WriteOneChar(0xCC); // skip:璺宠繃璇诲簭鍙峰垪鍙风殑鎿嶄綔
WriteOneChar(0x44); // convert:鍚�鍔ㄦ俯搴﹁浆鎹�
delay2(200);

Init_DS18B20();
WriteOneChar(0xCC); //skip:璺宠繃璇诲簭鍙峰垪鍙风殑鎿嶄綔
WriteOneChar(0xBE); //read:璇诲彇娓╁害瀵勫瓨鍣�,鍓嶄袱涓�灏辨槸娓╁害

L_18B20=ReadOneChar(); //璇诲彇娓╁害浣庡叓浣嶆暟鎹�
H_18B20=ReadOneChar(); //璇诲彇娓╁害楂樺叓浣嶆暟鎹�

if(H_18B20>0x7f) //鏈�楂樹綅涓�1鏃舵俯搴︽槸璐�
{
L_18B20=~L_18B20+1; //琛ョ爜杞�鎹�锛屽彇鍙嶅姞涓�
H_18B20=~H_18B20;
fg=1; //璇诲彇娓╁害涓鸿礋鏃秄g=1
}
Temp_Decimal=L_18B20&0x0f; //鍙栨俯搴﹀皬鏁伴儴鍒嗕簩杩涘埗
L_18B20=L_18B20>>4; //鍙栨俯搴︽暣鏁伴儴鍒嗕簩杩涘埗
H_18B20=H_18B20<<4;
Temp_Integer=H_18B20|L_18B20;
}



/***********************涓插彛閫氫俊***************************/
0 澶栭儴涓�鏂�0
1 瀹氭椂鍣�1
2 澶栭儴缁堢��1
3 瀹氭椂鍣�1
4 涓茶�屽彛涓�鏂�

RCAP2H = 0xff;
RCAP2L = 0xd9;
TCLK = 1;
RCLK = 1;
SCON = 0x50;//妯″紡1寮傛�ヤ紶杈撴ā寮�
PCON = 0x00;

IE |= 0x90; //Enable Serial Interrupt

TR2=1//寮�涓�鏂�

void serial() interrupt 4
{
if(RI == 1)
{
tempnum = SBUF;
RI = 0;
}
TI = 0;
}
void receiveinfo()
{
convert();
return;
}
void sendinfo()
{
SBUF = 100*displaynum[2] + 10*displaynum[1] + displaynum[0];
return;
}
void convert()
{
displaynum[0] = tempnum%10;
tempnum /= 10;
displaynum[1] = tempnum%10;
tempnum /= 10;
displaynum[2] = tempnum;
return;
}


void main()
{
while(1)
{
sendinfo();
receiveinfo();
}
return;
}