MCU.rar_AT品牌MCU

/******************************************************************************* 归梦桃花源 说明：DS18B20温度显示在前四个数码管上 2010.9.3 ********************************************************************************/ #include <reg52.H> #include <intrins.H> extern unsigned int idata Temperature; void delay(unsigned int i); sbit LS138A=P2^2; sbit LS138B=P2^3; sbit LS138C=P2^4; sbit D18B20=P3^7; unsigned char code Disp_Tab[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40}; unsigned long LedOut[5],LedNumVal; #define NOP() _nop_() #define _Nop() _nop_() void TempDelay (unsigned char idata us); void Init18b20 (void); void WriteByte (unsigned char idata wr); void read_bytes (unsigned char idata j); unsigned char CRC (unsigned char j); void GemTemp (void); void Config18b20 (void); void ReadID (void); void TemperatuerResult(void); bit flag; unsigned int idata Temperature,D[10]; unsigned char idata temp_buff[9]; unsigned char idata id_buff[8]; unsigned char idata *p,TIM; unsigned char idata crc_data; 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 (unsigned char idata us) { while(us--); } /************************************************************ *Function:18B20初始化 *parameter: *Return: *Modify: *************************************************************/ void Init18b20 (void) { D18B20=1; _nop_(); D18B20=0; TempDelay(50); _nop_(); D18B20=1; TempDelay(10); _nop_(); _nop_(); _nop_(); if(D18B20==0) flag = 1; else flag = 0; TempDelay(15); _nop_(); _nop_(); D18B20 = 1; } /************************************************************ *Function:向18B20写入一个字节 *parameter: *Return: *Modify: *************************************************************/ void WriteByte (unsigned char idata wr) { unsigned char idata i; for (i=0;i<8;i++) { D18B20 = 0; _nop_(); D18B20=wr&0x01; TempDelay(3); _nop_(); _nop_(); D18B20=1; wr >>= 1; } } /************************************************************ *Function:读18B20的一个字节 *parameter: *Return: *Modify: *************************************************************/ unsigned char ReadByte (void) { 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++) 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) { Temperature = temp_buff[1]*0x100 + temp_buff[0]; Temperature /= 16; TempDelay(1); } } /************************************************************ *Function:内部配置 *parameter: *Return: *Modify: *************************************************************/ void Config18b20 (void) { Init18b20(); WriteByte(0xcc); //skip rom WriteByte(0x4e); //write scratchpad 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 *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); WriteByte(0x44); Init18b20 (); WriteByte(0xcc); WriteByte(0xbe); p = temp_buff; GemTemp(); } unsigned int TempTick=0; void GetTemp() { if(TIM==1) { TIM=0; TemperatuerResult(); D[5]=Temperature; } } void T1zd(void) interrupt 3 { TH1 = 0xfe; //11.0592 TL1 = 0x33; TIM++; } void system_Ini() { TMOD|= 0x11; TH1=0xDC; //11.0592M TL1=0x00; IE = 0x8A; TR1 = 1; } main() { unsigned char i; system_Ini(); while(1) { GetTemp(); LedNumVal=Temperature; LedOut[0]=Disp_Tab[LedNumVal%10000/1000]; LedOut[1]=Disp_Tab[LedNumVal%1000/100]; LedOut[2]=Disp_Tab[LedNumVal%100/10]; //十位 LedOut[3]=Disp_Tab[LedNumVal%10]; //个位 for(i=0; i<4; i++) { P0 = LedOut[i] ; switch(i) { //138译码 case 0:LS138A=0; LS138B=0; LS138C=0; break; case 1:LS138A=1; LS138B=0; LS138C=0; break; case 2:LS138A=0; LS138B=1; LS138C=0; break; case 3:LS138A=1; LS138B=1; LS138C=0; break; } delay(150); } P0 = 0; } } void delay(unsigned int i) { c