sht10.h

SHT10资料和C例程

#include <intrins.h>
#include <stdio.h>
#include <string.h>

#define uchar unsigned char
#define uint unsigned int

uchar a,b,c,d,e,f,g,h;

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// SHT10 相关控制信号及变量 
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
enum {TEMP,HUMI};
sbit DATA = P2^1;
sbit SCK = P2^0;

unsigned char Tem[2];
unsigned char Hum[2];
uchar error;

////////////////////////////////////////////////
//温湿度传感器地址定义
///////////////////////////////////////////////
#define noACK 0
#define ACK   1
                            //adr command r/w
#define STATUS_REG_W 0x06   //000   0011    0
#define STATUS_REG_R 0x07   //000   0011    1
#define MEASURE_TEMP 0x03   //000   0001    1
#define MEASURE_HUMI 0x05   //000   0010    1
#define RESET        0x1e   //000   1111    0


//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// SHT10 温湿度读字节子程序 
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
char s_write_byte(unsigned char value)
{ 
unsigned char i,error=0; 
for (i=0x80;i>0;i/=2)             //shift bit for masking
{ 
   if (i & value) 
    DATA=1;          //masking value with i , write to SENSI-BUS
   else 
    DATA=0;                        
   SCK=1;                          //clk for SENSI-BUS
   _nop_();_nop_();_nop_();        //pulswith approx. 5 us 
   SCK=0;
}
DATA=1;                           //release DATA-line
SCK=1;                            //clk #9 for ack 
error=DATA;                       //check ack (DATA will be pulled down by SHT11)
SCK=0;        
return error;                     //error=1 in case of no acknowledge
}

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// SHT10 温湿度写字节子程序 
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
char s_read_byte(unsigned char ack)
{ 
unsigned char i,val=0;
DATA=1;                           //release DATA-line
for (i=0x80;i>0;i/=2)             //shift bit for masking
{ 
   SCK=1;                          //clk for SENSI-BUS
   if (DATA) val=(val | i);        //read bit 
   SCK=0;       
}
DATA=!ack;                        //in case of "ack==1" pull down DATA-Line
SCK=1;                            //clk #9 for ack
_nop_();_nop_();_nop_();          //pulswith approx. 5 us 
SCK=0;          
DATA=1;                           //release DATA-line
return val;
}

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// SHT10 温湿度传输其始子程序 
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
void s_transstart(void)
{ 
DATA=1; SCK=0;                   //Initial state
_nop_();
SCK=1;
_nop_();
DATA=0;
_nop_();
SCK=0; 
_nop_();_nop_();_nop_();
SCK=1; 
_nop_();
DATA=1;     
_nop_();
SCK=0;     
}

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// SHT10 温湿度连接复位子程序 
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
void s_connectionreset(void)
{ 
unsigned char i; 
DATA=1; SCK=0;                    //Initial state
for(i=0;i<9;i++)                  //9 SCK cycles
{ 
   SCK=1;
   SCK=0;
}
s_transstart();                   //transmission start
}
           
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// SHT10 温湿度获取温度或湿度子程序 
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)
{ 
unsigned error=0;
unsigned int i;

s_transstart();                   //transmission start
switch(mode)
{                     //send command to sensor
   case TEMP : error+=s_write_byte(MEASURE_TEMP); break;               温湿度写字节 //查一下
   case HUMI : error+=s_write_byte(MEASURE_HUMI); break;                 温湿度写字节 //查一下
   default     : break; 
}
for (i=0;i<65535;i++) 
   if(DATA==0) break;             //wait until sensor has finished the measurement
if(DATA) error+=1;                // or timeout (~2 sec.) is reached
*(p_value) =s_read_byte(ACK);    //read the first byte (MSB)最高有效位
*(p_value+1)=s_read_byte(ACK);    //read the second byte (LSB)最低有效位
*p_checksum =s_read_byte(noACK); //read checksum
return error;
}

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//显示温湿度子程序
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
void ShowTem(uchar *ptem,uchar *phum)
{ 
int ntemp,t1,t0,aa;
int nhum;
float flt1;

ntemp= (*ptem)*256+ (*(ptem+1));
t1=(ntemp)/100-40;
t0=(ntemp)%100;
a=t1/10;b=t1%10;
c=t0/10;d=t0%10;

nhum = (*phum)*256+ (*(phum+1));
flt1=0.0405*nhum-0.0000028*nhum*nhum-4; 
aa=flt1*100;
e=aa/1000;
f=aa%1000/100;
g=aa%1000%100/10;
h=aa%10;
}