(部分代码参考蜜蜂老师)

void read_rd1() {   IIC_Start();   IIC_SendByte(0x90);   IIC_WaitAck();   IIC_SendByte(0x01);   IIC_WaitAck();    IIC_Start();   IIC_SendByte(0x91);   IIC_WaitAck();   rb1=IIC_RecByte();   IIC_SendAck(1);   IIC_Stop(); } 

void read_rb3() {   IIC_Start();   IIC_SendByte(0x90);   IIC_WaitAck();   IIC_SendByte(0x03);   IIC_WaitAck()；   IIC_Start();   IIC_SendByte(0x91);   IIC_WaitAck();   rb2=IIC_RecByte();   IIC_SendAck(1);   IIC_Stop(); } 

float ds18b20_read(void) {  unsigned char tml,tmh;  init_ds18b20(); // Delay_OneWire(1);  Write_DS18B20(0xcc);  Write_DS18B20(0x44);    init_ds18b20(); // Delay_OneWire(1);  Write_DS18B20(0xcc);  Write_DS18B20(0xbe);  tml=Read_DS18B20();  tmh=Read_DS18B20();  temp=(tmh<<8|tml)*0.625;  temp_r=(unsigned int)temp;  return temp; } 

unsigned char code write[7]={0x80,0x82,0x84,0x86,0x88,0x8a,0x8c}; unsigned char code read[7]={0x81,0x83,0x85,0x87,0x89,0x8b,0x8d}; unsigned char time[4]={0x55,0x23,0x23}/秒，分，日，月，周，年 void ds1302write() {  unsigned char i;  Write_Ds1302_Byte(0x8e,0x00);   for(i=0;i<7;i  )    {      Write_Ds1302_Byte(write[i],time[i]);    }      Write_Ds1302_Byte(0x8e,0x80); }  void ds1302read() {   unsigned char i;  for(i=0;i<7;i  )  {   time[i]=Read_Ds1302_Byte(read[i]);     } } 

void write_e2prom(unsigned char pom,unsigned char dat) {   IIC_Start();   IIC_SendByte(0xa0);   IIC_WaitAck();   IIC_SendByte(pom);   IIC_WaitAck();   IIC_SendByte(dat);   IIC_WaitAck();   IIC_Stop(); }  unsigned char read_e2prom(unsigned char pom) {   unsigned char dat;   IIC_Start();   IIC_SendByte(0xa0);   IIC_WaitAck();   IIC_SendByte(pom);   IIC_WaitAck();     IIC_Start();   IIC_SendByte(0xa1);   IIC_WaitAck();   dat=IIC_RecByte();   IIC_SendAck(1);   IIC_Stop();   return dat; } 

void out_dac(unsigned char dat) {   IIC_Start();   IIC_SendByte(0x90);   IIC_WaitAck();   IIC SendByte(0x40);   IIC_WaitAck();   IIC_SendByte(dat);   IIC_WaitAck();   IIC_Stop(); } 

void Init_Timer() {  TH0 = 0xff;          TL0 = 0xff;  TH1 = (65536 - 50000) / 256;          TL1 = (65536 - 50000) % 256;  TMOD = 0x16;     ///定时器1用法1，定时器0用法2，计数         ET0 = 1;         ET1 = 1;     EA = 1;  TR0 = 1;  TR1 = 1; } void Service_T0() interrupt 1 {  count_f  ; } void Service_T1() interrupt 3 {     TH1 = (65536 - 50000) / 256;             TL1 = (65536 - 50000) % 256;       count_t  ;  if(count_t == 20)       //1s  {   dat_f = count_f;   count_f = 0;   count_t = 0;  } } 

void Rsevies_Uart() interrupt 4  //接收 {    if(RI == 1)    {      Rsevies_dat=SBUF;   RI = 0;     } } void Send_Uart(unsigned char Send_dat)   //发送 {  SBUF = Send_dat;  while(TI == 0);  TI = 0; }  void Send_string(unsigned char *str) {  while(*str != '\0')  {   Send_Uart(*str  );  } } 

sbit TX=P1^0; sbit RX=P1^1; unsigned char flag；    //使能参数 unsigned int distance ; //距离 void Delay14us()  //@12.000MHz  14us     {  unsigned char i;  _nop_();  _nop_();  i = 39;  while (--i); }  void inte()       //定时器1初始化 {   TMOD &= 0x0f;   TH1=0X00;   TL1=0X00; }  void send_wave()     ///产生8个脉冲信号 {     u8 i;  for(i=0;i<7;i  )  {    TX=1;    Delay14us();    TX=0;    Delay14us();  } }   void measure() {  u16 time;  send_wave();  TR1=1;  while((RX==1)&&(TF1==0))  {    flag=1;            SMG();  }   flag=0;  TR1=0;  if(TF1==0)  {   time=TH1;   time=(time<<8)|TL1;   distance = ((time/10)*17)/100;       //距离  }  else  {   TF1=0;   distance= 999;         ///测距跑飞标志  }  TH1=0X00;  TL1=0X00; }