include <reg52.H>
#include <intrins.h>
sbit D18B20=P3^7; //DQ接P3^7
#define NOP() _nop_()
#define _Nop() _nop_()
void TempDelay (unsigned char idata us); //延时函数定义
void Init18b20 (void); //初始化函数定义
void WriteByte (unsigned char idata wr); //单字节写入
void read_bytes (unsigned char idata j); //定义多字节数据读取
unsigned char CRC (unsigned char j);//定义校验码数组
void GemTemp (void); //数据处理
void Config18b20 (void); //配置上下限即处理位数(9/10/11)
void ReadID (void); //读取器件ID，即ROM中的数据
void TemperatuerResult(void); //最终数据输出
//bit flag;
unsigned int idata Temperature,D[10]; //定义温度数组
unsigned char idata temp_buff[9]; //定义RAM数据暂存数组
//存储读取的字节，read scratchpad为9字节，read rom ID为8字节
unsigned char idata id_buff[8]; //定义ROM数据暂存数组
unsigned char idata *p,TIM; //指针变量
unsigned char idata crc_data; //CRC计算变量定义
unsigned char code CrcTable [256]={
0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53};
//CRC数据表
//Function:延时处理
void TempDelay (unsigned char idata us)
{
while(us--);
}
//Function:18B20初始化
void Init18b20 (void)
{
D18B20=1; //侦测到下跳沿，初始化
_nop_();
D18B20=0;
TempDelay(160); //delay480 us (480)
_nop_();
D18B20=1; //释放总线
TempDelay(30); //delay 96 us (60-112)
_nop_();
_nop_();
_nop_(); //18B20侦测到此上升沿，会自动应答
//发送presence信号
//if(D18B20==0)
// flag = 1; //detect 1820 success!
//else
// flag = 0; //detect 1820 fail!
TempDelay(30); //delay 96 us(60-240)
_nop_(); //发送应答脉冲
_nop_();
D18B20 = 1; //释放总线
}
//Function:向18B20写入一个字节
void WriteByte (unsigned char idata wr) //单字节写入
{
unsigned char idata i;
for (i=0;i<8;i++)
{
D18B20 = 1;
_nop_();
D18B20 = 0; //侦测到下跳沿，初始化
_nop_();
D18B20=wr&0x01; //写数据在（60-120）us内
TempDelay(30); //delay 96(60-120)us
_nop_();
_nop_(); //至少大于1us恢复时间
D18B20=1; //释放总线
wr >>= 1; //一个字节8位，总共写8次
}
}
//Function:读18B20的一个字节
unsigned char ReadByte (void) //读取单字节
{
unsigned char idata i,u=0;
for(i=0;i<8;i++)
{
D18B20 = 1;
_nop_();
D18B20 = 0; //负跳沿，初始化
u >>= 1;
D18B20 = 1; //释放总线
if(D18B20==1)
u |= 0x80;
TempDelay (3); //15us内采样
_nop_();
}
return(u);
}
//Function:读18B20
void read_bytes (unsigned char idata j)
{
unsigned char idata i;
for(i=0;i<j;i++)
{
*p = ReadByte();
p++;
}
}
//Function:CRC校验
unsigned char CRC (unsigned char j)
{
unsigned char idata i,crc_data=0;
for(i=0;i<j;i++) //查表校验
crc_data = CrcTable[crc_data^temp_buff[i]];
return (crc_data);//返回i=8时的crc_data
}//若为0，校验正确，即此时的temp_buff[8]=0x00;
//Function:读取温度
void GemTemp (void)
{
read_bytes (9);
if (CRC(9)==0) //校验正确
{ //暂存器第0字节低8位，第一字节为高8位。
Temperature = temp_buff[1]*0x100 + temp_buff[0];
// Temperature *= 0.625;
Temperature /= 16; //转换成10进制
TempDelay(1);
}
}
//Function:内部配置
void Config18b20 (void) //重新配置报警限定值和分辨率
{
Init18b20();
WriteByte(0xcc); //skip rom
WriteByte(0x4e); //配置暂存器2，3，4字节数据
WriteByte(0x19); //上限
WriteByte(0x1a); //下限
WriteByte(0x7f); //set 11 bit (0.125)
Init18b20();
WriteByte(0xcc); //skip rom
WriteByte(0x48); //保存设定值
Init18b20();
WriteByte(0xcc); //skip rom
WriteByte(0xb8); //回调设定值
}
//Function:读18B20ID
void ReadID (void)//读取器件 id
{
Init18b20();
WriteByte(0x33); //read rom
read_bytes(8);
}
//Function:18B20ID全处理
void TemperatuerResult(void)
{
p = id_buff;
ReadID(); //读取器件ID
Config18b20(); //ROM配置
Init18b20 (); //初始化
WriteByte(0xcc); //单点检测，跳过ROM检索
WriteByte(0x44); //启用温度转换
Init18b20 ();
WriteByte(0xcc); //单点检测，跳过ROM检索
WriteByte(0xbe); //读取暂存器的全部内容
p = temp_buff;
GemTemp();
}
unsigned int TempTick=0;
void GetTemp()
{
if(TIM==1)
{ TIM=0;
TemperatuerResult();
// D[5]=Temperature;
}
}
//刷新时间
void T1zd(void) interrupt 3
{
TH1 = 0xfe; TL1 = 0x33;
TIM++;
}
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