中颖单片机DS18B20温度读取程序（12MHz)

#include "stdio.h" #include "SH79F081.h" #include "string.h" #include "EUART.h" #include <intrins.h> //Pin defination ////////////////Gloable Variable defination///////////////////////////////// //If this counter is more than one number, it means that alarm states. unsigned int Timer0_Counter; unsigned char SPI_Command_Data[5]; volatile unsigned char Flag; sbit IR_CTRL = P3^0; sbit IR_REC = P2^0; unsigned char NEC_IR_ADDR1; unsigned char NEC_IR_ADDR2; #define RC5_Protocol 1 #define NEC_Protocol 2 volatile unsigned char Protocol_Type; volatile unsigned int endcount; unsigned char iPreBit,iIrMode; unsigned int iHight,iLow; unsigned char iBitCount,iIrData[4]; unsigned char IR_Data_Received; unsigned char CheckIR(); sbit d_18b20=P3^1;//18b20器件引脚 unsigned char temp_int;//整数部分 unsigned char temp_point;//小数部分 unsigned int temph; unsigned int templ; ////////////////End of Gloable Variable defination////////////////////////// void Delayms(unsigned int ms) { int i,j; for(j = 0; j < ms; j++) { for (i = 0; i < 820; i++); //1ms } } void Init_Timer0_ISR(void) { TMOD &= 0xF0; TMOD |= 0x01; TL0 = 0x84; TH0 = 0xFF; ET0 = 1; TR0 = 1; EA = 1; } //External 0 interrupt service routine void INT0_isr() interrupt 0 using 2 { EA=0; EA=1; } //Timer 0 interrupt service routine void Timer0_ISR()interrupt 1 { // EA=0; if(1 == Protocol_Type) { TL0 = 0x85; TH0 = 0xFF; } else if(2 == Protocol_Type) { TL0 = 0x83; TH0 = 0xFF; } else if(3 == Protocol_Type) { TL0 = 0x85; TH0 = 0xFF; CheckIR(); } if(1 == Flag) { IR_CTRL = !IR_CTRL; } else { IR_CTRL = 0; } Timer0_Counter++; // EA=1; } void RC5_Send_IF_One() { } void RC5_Send_IF_Zero() { } void RC5_Send_IR_Data(unsigned char RC5_Address, unsigned char RC5_Command) { } void NEC_Send_IR_Data(unsigned char p_irdata) { } void NEC_Send_IR_Data_SAMSUNG(unsigned char p_irdata) { } unsigned char CheckIR() { } void delay_18b20(unsigned int i)//18b20延时程序 { while(--i); } void initial_18b20()//初始化 { unsigned char x = 0; d_18b20=1; P3CR = P3CR | 0x02; delay_18b20(10); d_18b20=0; delay_18b20(600); P3CR = P3CR & 0xFD; P3PCR = P3PCR & 0xFD; delay_18b20(55); x = d_18b20; delay_18b20(10); while(x){;} delay_18b20(150); } void ww_byte_18b20(unsigned char _data)//向18b20写入数据 { unsigned char i; d_18b20=1; P3CR = P3CR | 0x02; delay_18b20(5); for(i=0;i<8;i++) { d_18b20=0; delay_18b20(1); d_18b20=_data&0x01; delay_18b20(90); d_18b20=1; _data>>=1; } delay_18b20(10); } unsigned int rebyte(void)//读取温度子程序 { unsigned char i,dat=0; unsigned char x = 0; for(i=0;i<8;i++) { dat>>=1; d_18b20=1; P3CR = P3CR | 0x02; delay_18b20(1); d_18b20=0; delay_18b20(1); P3CR = P3CR & 0xFD; P3PCR = P3PCR & 0xFD; delay_18b20(8); x = d_18b20; if(x)dat|=0x80; delay_18b20(40); } delay_18b20(40); return(dat); } unsigned int readtemp()//读取温度 { initial_18b20();//先初始化18b20 ww_byte_18b20(0xcc);//跳过ROM匹配 ww_byte_18b20(0x44);//启动温度转换 delay_18b20(1200); delay_18b20(1200); delay_18b20(1200); delay_18b20(1200); delay_18b20(1200); delay_18b20(1200); initial_18b20(); ww_byte_18b20(0xcc);//跳过ROM匹配 ww_byte_18b20(0xbe);//读取温度寄存器等 templ=rebyte(); temph=rebyte(); temp_int=((temph<<4)&0x70)|((templ>>4)&0x0f);//整数部分 temp_point=(templ&0x0f)*5;//小数部分 return(temp_int*100+temp_point); } //////////////////////////////////////////////////////////////////////////// ///////////////Main Function, the program starts from here/////////////////// void main() { unsigned char Receive_Data; unsigned char String_Length; unsigned int i,j; unsigned char Parity,temp; unsigned int Temperature; unsigned char string[8]; unsigned char IR_Flag = 0; // P3CR = P3CR | 0x02; P2CR = P2CR & 0xFE; Flag = 1; // Init_Timer0_ISR(); Init_EUART_ISR(); uiGRcvNew = 0; uiGNum = 0; // NEC_IR_ADDR1 = 3; // NEC_IR_ADDR2 = ~NEC_IR_ADDR1; NEC_IR_ADDR1 = 0x07; NEC_IR_ADDR2 = 0x07; PCON = PCON |0x80; Flag = 1; ////////////////////////////*************///////// iIrMode = 0; iPreBit = 0; Protocol_Type = 3; IR_Data_Received = 0; EUART_SendnStr("The system is running ...\r\n",27); EUART_SendnStr("\r\n",2); P3CR = P3CR & 0xFD; P3PCR = P3PCR & 0xFD; while(1) { // IR_CTRL=1; // delay_18b20(600); /// IR_CTRL=0; // delay_18b20(600); // //1 --> 2.84uS //10 --> 14.4uS //20 --> 27.2uS //50 --> 64.8uS //100 --> 128uS //160 --> 204uS //600 --> 748uS // initial_18b20(); // initial_18b20(); Temperature = readtemp(); EUART_SendnStr("The temperature is \r\n",20); string[0] = ((Temperature/100)/10) + '0'; string[1] = ((Temperature/100)%10) + '0'; string[2] = '.'; string[3] = ((Temperature%100)/10) + '0'; string[4] = ((Temperature%100)%10) + '0'; string[5] = '\r'; string[6] = '\n'; EUART_SendnStr(string,7); #if 0 if(1 == uiGRcvNew) { EUART_SendnStr("This is a demo program for UART speed test\r\n",44); uiGRcvNew = 0; if((uiGRcvBuf[0] == 0x55)) { Parity = uiGRcvBuf[0] ^ uiGRcvBuf[1] ^ uiGRcvBuf[2] ^ uiGRcvBuf[3] ^ uiGRcvBuf[4]; if(Parity == uiGRcvBuf[5]) { if(0x01 == uiGRcvBuf[1]) //NEC Protocol { Protocol_Type = 1; NEC_IR_ADDR1 = uiGRcvBuf[2]; NEC_IR_ADDR2 = uiGRcvBuf[3]; NEC_Send_IR_Data(uiGRcvBuf[4]); } else if(0x02 == uiGRcvBuf[1]) { Protocol_Type = 2; RC5_Send_IR_Data(uiGRcvBuf[2], uiGRcvBuf[3]); } } } } if(1 == IR_Data_Received) { IR_Data_Received = 0; } #endif }// end while(1) }