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/*************************此部分为18B20的驱动程序*************************************/ #include "..\src\config.h" sbit D18B20=P3^7; bit flag; uint Temperature; uchar temp_buff[9]; //存储读取的字节，read scratchpad为9字节，read rom ID为8字节 uchar id_buff[8]; uchar *p,TIM; uchar crc_data; void TempDelay (uint us); void Init18b20 (void); void WriteByte (unsigned char idata wr); //单字节写入 void read_bytes (unsigned char idata j); void GemTemp (void); void Config18b20 (void); void ReadID (void); void TemperatuerResult(void); uchar CRC (uchar j); 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}; // /************************************************************ *Function:延时处理 *parameter: *Return: *Modify: *************************************************************/ void TempDelay (uint us) { while(us--); } /************************************************************ *Function:18B20初始化 *parameter: *Return: *Modify: *************************************************************/ void Init18b20 (void) { D18B20=1; _nop_(); D18B20=0; TempDelay(80); //delay 530 uS//80 _nop_(); D18B20=1; TempDelay(14); //delay 100 uS//14 _nop_(); _nop_(); _nop_(); if(D18B20==0) flag = 1; //detect 1820 success! else flag = 0; //detect 1820 fail! TempDelay(20); //20 _nop_(); _nop_(); D18B20 = 1; } /************************************************************ *Function:向18B20写入一个字节 *parameter: *Return: *Modify: *************************************************************/ void WriteByte (unsigned char idata wr) //单字节写入 { unsigned char idata i; for (i=0;i<8;i++) { D18B20 = 0; _nop_(); D18B20=wr&0x01; TempDelay(3); //delay 45 uS //5 _nop_(); _nop_(); D18B20=1; wr >>= 1; } } /************************************************************ *Function:读18B20的一个字节 *parameter: *Return: *Modify: *************************************************************/ unsigned char ReadByte (void) //读取单字节 { unsigned char idata i,u=0; for(i=0;i<8;i++) { D18B20 = 0; u >>= 1; D18B20 = 1; if(D18B20==1) u |= 0x80; TempDelay (2); _nop_(); } return(u); } /************************************************************ *Function:读18B20 *parameter: *Return: *Modify: *************************************************************/ void read_bytes (unsigned char idata j) { unsigned char idata i; for(i=0;i<j;i++) { *p = ReadByte(); p++; } } /************************************************************ *Function:CRC校验 *parameter: *Return: *Modify: *************************************************************/ 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); } /************************************************************ *Function:读取温度 *parameter: *Return: *Modify: *************************************************************/ void GemTemp (void) { read_bytes (9); if (CRC(9)==0) //校验正确 { Temperature = temp_buff[1]*0x100 + temp_buff[0]; // Temperature *= 0.625; Temperature /= 16; TempDelay(1); } } /************************************************************ *Function:内部配置 *parameter: *Return: *Modify: *************************************************************/ void Config18b20 (void) //重新配置报警限定值和分辨率 { Init18b20(); WriteByte(0xcc); //skip rom WriteByte(0x4e); //write scratchpad WriteByte(0x19); //上限 WriteByte(0x1a); //下限 WriteByte(0x7f); //set 12 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 *parameter: *Return: *Modify: *************************************************************/ void ReadID (void)//读取器件 id { Init18b20(); WriteByte(0x33); //read rom read_bytes(8); } /************************************************************ *Function:18B20ID全处理 *parameter: *Return: *Modify: *************************************************************/ void TemperatuerResult(void) { p = id_buff; ReadID(); Config18b20(); Init18b20 (); WriteByte(0xcc); //skip rom WriteByte(0x44); //Temperature convert 温度转换 Init18b20 (); WriteByte(0xcc); //skip rom WriteByte(0xbe); //read Temperature p = temp_buff; GemTemp(); } void GetTemp() { if(TIM==100) //每隔 1000ms 读取温度 { TIM=0; TemperatuerResult(); } } /************************************* [ t1 (10ms)中断] 中断 *************************************/ void T1zd(void) interrupt 3 { TH1 = 0xD8; //定时10MS TL1 = 0xF0; TIM++; }