SHT10程序代码

/*************定义接口******************
P2.6------SCK (SHT10)
P2.7------DATA (SHT10)
*****************************************/ sbit SCK = P2^6; //定义通讯时钟端口
sbit DATA = P2^7; //定义通讯数据端口
;-------------------------------------*/
char s_write_byte(unsigned char value)
// writes a byte on the Sensibus and checks the acknowledge
{
unsigned char i,error=0;
// calculates dew point // input: humidity [%RH], temperature [℃]
// output: dew point [℃]
{ float logEx,dew_p3;7.5*t/(237.3+t)+(log10(h)-2);
typedef union { unsigned int i;
//定义了两个共用体
float f;
} value; enum {TEMP,HUMI};
//枚举测量温度或湿度
#define noACK 0
//用于判断是否结束通讯
#define ACK 1
//结束数据传输
//adr command r/w
float calc_dewpoint(float h,float t); //计算露点
//char s_softreset(void);
//char s_read_statusreg(unsigned char *p_value, unsigned char *p_checksum);
//char s_write_statusreg(unsigned char *p_value);
#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
rh_true=(t_C-25)*(T1+T2*rh)+rh_lin; //calc. temperature compensated humidity [%RH]
if(rh_true>100)rh_true=100;
//cut if the value is outside of
if(rh_true<0.1)rh_true=0.1;
//error=1 in case of no acknowledge
}
/*-------------------------------------;模块名称:s_read_byte();
;功 能:SHT10 读函数
;占用资源:--
;参数说明:--
;创建日期:2012.04.10
;版 本:FV1.0(函数版本 Function Version)
;修改日期:--
;修改说明:--
;-------------------------------------*/
char s_read_byte(unsigned char ack)
// reads a byte form the Sensibus and gives an acknowledge in case of "ack=1"
温湿度传感器的 SHT10 代码如下： ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 功能说明:SHT10 与上位机（串口调试助手）的温湿度显示 KeilC 程序 微处理器:STC89C52 编译环境:Keil uVision V4 作 者:Ding ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
;修改日期:--
;修改说明:--
;-------------------------------------*/
void s_connectionreset(void)
// communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart
//the physical possible range
*p_temperature=t_C;
//return temperature [℃]
*p_humidity=rh_true;
//return humidity[%RH]
}
/*-------------------------------------;模块名称:calc_dewpoint();
char s_read_byte(unsigned char ack); //SHT10 读函数
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode);//测量温湿
度函数
void calc_sht10(float *p_humidity ,float *p_temperature);//温湿度补偿
}
//---------------------------------------------------------------------------------char s_read_statusreg(unsigned char *p_value, unsigned char *p_checksum) //---------------------------------------------------------------------------------// reads the status register with checksum (8-bit) {
#define RESET
0x1e //000 1111 0
/****************定义函数****************/
void s_transstart(void);
//启动传输函数
void s_connectionreset(void);
//连接复位函数
char s_write_byte(unsigned char value);//SHT10 写函数
s_connectionreset();
//reset communication
error+=s_write_byte(RESET);
//send RESET-command to sensor
return error;
//error=1 in case of no response form the sensor
;功 能:露点，空气湿度达到饱和时的温度
;占用资源:--
;参数说明:--
;创建日期:2012.04.10
;版 本:FV1.0(函数版本 Function Version)
;修改日期:--
;修改说明:--
;-------------------------------------*/
float calc_dewpoint(float h,float t)
float rh=*p_humidity; float t=*p_temperature; float rh_lin; float rh_true; float t_C;
// rh: Humidity [Ticks] 12 Bit
// t:
Temperature [Ticks] 14 Bit
// rh_lin: Humidity linear
;*************************************************************/ #include <reg52.h> //Microcontroller specific library, e.g. port definitions #include <intrins.h> //Keil library (is used for _nop()_ operation) #include <math.h> //Keil library #include <stdio.h> //Keil library
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_();
//
_____________________________________________________
________
// DATA:
|_______|
//
_________
___ ___
// SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______
// rh_true: Temperature compensated humidity