【51单片机C语言+Proteus仿真实例】DS1621温度传感器实验.zip

/*************** writer:shopping.w ******************/ #include <reg52.h> #include <intrins.h> #define uint unsigned int #define uchar unsigned char bit I2C_Busy, NO_Ack,Bus_Fault,point; uchar bdata a; sbit LSB = a^0; sbit MSB = a^7; sbit SDA = P3^3; sbit SCL = P3^2; 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; else SDA = 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_data[i]); 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(Array[val%10]); SendCharToSerialPort('.'); if(point) SendCharToSerialPort('5'); else SendCharToSerialPort('0'); SendCharToSerialPort(' '); SendCharToSerialPort('C'); SendCharToSerialPort('\r'); } void SetTemperatureLimit(uchar HI,uchar LO) { command_data[4] = HI; command_data[5] = 0; command_data[7] = LO; command_data[8] = 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_data[1] = c; SendData(0x90,0,1); } void main() { uchar i; InitialiseSerialPort(); while(Prompt[i]!='\0') SendCharToSerialPort(Prompt[i++]); WriteConfig(0x02); StartConversion(); SetTemperatureLimit(40,35); while(1) { DelayMS(50); SendTemperatureToSerialPort(ReadTemp()); } }