/*********************************************************/// SHT11温湿度检测/*********************************************************/char ShtMeasure(unsigned char *p_value, unsigned char*p_checksum, unsigned char mode){unsignederror=0;unsignedint i;ShtTransStart(); switch(mode)  {case1 : error+=WriteByte(0x03);break;case2 :            error+=ShtWriteByte(0x05);break;default:break;}for(i=0;i<65535;i++)if(Data_P==0)break; if(Data_P)error+=1; *(p_value)=ShtReadByte(1);*(p_value-1)=ShtReadByte(1);*p_checksum=ShtReadByte(0);returnerror;      }/*********************************************************/// SHT11温湿度值标度变换及温度补偿/*********************************************************/void CalcSHT11(float *p_humidity ,float*p_temperature){constfloat C1=-4.0constfloat C2=+0.0405;  constfloat C3=-0.0000028;constfloat T1=+0.01;constfloat T2=+0.00008;floatrh=*p_humidity;floatt=*p_temperature;   floatrh_lin; floatrh_true;      float t_C;t_C=t*0.01- 40;rh_lin=C3*rh*rh+ C2*rh + C1;rh_true=(t_C-25)*(T1+T2*rh)+rh_lin;*p_temperature=t_C;*p_humidity=rh_true;}/*********************************************************/// 温度校正/*********************************************************/unsigned char TempCorrect(int temp){if(temp<0)    temp=0;if(temp>970)  temp=970;if(temp>235)  temp=temp+10;if(temp>555)  temp=temp+10;if(temp>875)  temp=temp+10;temp=(temp%1000)/10;returntemp;}/*********************************************************/// 湿度校正/*********************************************************/unsigned char HumiCorrect(unsigned int humi){if(humi>999)  humi=999;if((humi>490)&&(humi<951))  humi=humi-10;humi=(humi%1000)/10;returnhumi;}/*********************************************************/// 读取SHT11的温湿度数据/*********************************************************/void ReadShtData(){valuehumi_val,temp_val;unsignedchar error;unsignedchar checksum; unsignedint temp1,humi1;     error=0;error+=ShtMeasure((unsignedchar*)&temp_val.i,&checksum,1);error+=ShtMeasure((unsignedchar*)&humi_val.i,&checksum,2);if(error!=0)ShtConnectReset();else{temp_val.f=(float)temp_val.i;CalcSHT11(&humi_val.f,&temp_val.f);    temp1=temp_val.f*10;temp=TempCorrect(temp1);humi1=humi_val.f*10-50;humi=HumiCorrect(humi1);humi = humi + 2;}
}