DS1621溫度傳感器實驗.doc

/* writer:shopping.w */#include <reg52.h>#include <intrins.h>#define uint unsigned int#define uchar unsigned charbit I2C_Busy, NO_Ack,Bus_Fault,point;uchar bdata a;sbit LSB = a0;sbit MSB = a7;sbit SDA = P33;sbit SCL = P32;uchar Array = 0,1,2,3,4,5,6,7,8,9;uchar command_data= 0xac,0x00,0xee,0xa1,0x00,0x00,0xa2,0x00,0x00,0xaa;uchar Prompt="Waiting for a while.r"uchar i;void DelayMS(uint ms) uchar i;while(ms-) for(i=0;i<120;i+);void SendStop() SDA = 0;SCL = 1;_nop_();SDA = 1;I2C_Busy = 0;void SendByte(uchar wd) uchar i;a = wd;for(i=0;i<8;i+) SCL = 0;_nop_();_nop_();SDA = MSB;a <<= 1;_nop_();_nop_();SCL = 1;_nop_();_nop_();SCL = 0;SDA = 1;SCL = 1;_nop_();_nop_();if(!SDA) SCL = 0;_nop_();_nop_();else NO_Ack = 1;SCL = 0;_nop_();_nop_();void Master(uchar slave_addr) I2C_Busy = 1;NO_Ack = 0;Bus_Fault = 0;if(!SCL | !SDA)Bus_Fault = 1;else SDA = 0;_nop_();_nop_();SCL = 0;_nop_();_nop_();SendByte(slave_addr);uchar RecvByte(uchar cnt)uchar i,rcv_data;for(i=0;i<8;i+) SDA = 1;SCL = 1;_nop_();LSB = SDA;if(i<7)a <<= 1;_nop_();SCL = 0;_nop_(); if(cnt = 1)SDA = 1;elseSDA = 0;SCL = 1;_nop_();SCL = 0;SDA = 1;_nop_();rcv_data = a;return rcv_data;void SendData(uchar slave_address,uchar start,uchar end) Master(slave_address);for(i=start;i<=end;i+)SendByte(command_datai);SendStop();void InitialiseSerialPort() TMOD = 0x20;TH1 = 0xfd;SCON = 0x50;TR1 = 1;void SendCharToSerialPort(uchar ch) SBUF = ch;while(!TI);TI = 0;void SendTemperatureToSerialPort(uchar val) if(val>200) val = 255-val;SendCharToSerialPort(-);if(!point)val+=1;SendCharToSerialPort(Array(val/10)/10);SendCharToSerialPort(Array(val/10)%10);SendCharToSerialPort(Arrayval%10);SendCharToSerialPort(.);if(point)SendCharToSerialPort(5);elseSendCharToSerialPort(0);SendCharToSerialPort( );SendCharToSerialPort(C);SendCharToSerialPort(r);void SetTemperatureLimit(uchar HI,uchar LO)command_data4 = HI;command_data5= 0;command_data7 = LO;command_data8 = 0;SendData(0x90,3,5);DelayMS(10);SendData(0x90,6,8);void StartConversion() SendData(0x90,2,2);DelayMS(750);uchar ReadTemp() uchar d;SendData(0x90,9,9);Master(0x91);d = RecvByte(0);point = RecvByte(1)>>7;SendStop();return d;void WriteConfig(uchar c) command_data1 = c;SendData(0x90,0,1);void main() uchar i; InitialiseSerialPort();while(Prompti!=0)SendCharToSerialPort(Prompti+);WriteConfig(0x02);StartConversion();SetTemperatureLimit(40,35);while(1) DelayMS(50);SendTemperatureToSerialPort(ReadTemp();