基于STM32的SHT10温湿度程序

//本程序不包括配置时钟、IO口等配置函数，用户只需根据自己的需要配置好IO口，并改掉GPIO_Pin_10、GPIO_Pin_11这两个引脚即可。



#include "stm32f10x_lib.h"



//*********************第二部分DHT90设置 START****************************************
#define SCK GPIO_Pin_10 //定义通讯时钟端口
#define DATA GPIO_Pin_11 //定义通讯数据端口
#define uchar unsigned char
#define uint unsigned int

typedef union
{ u16 i; //定义了两个共用体
float f;
} value;

//enum {TEMP,HUMI}; //TEMP=0,HUMI=1

#define noACK 0 //结束数据传输
#define ACK 1 //不结束数据传输
//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

/****************声明函数****************/
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
char s_read_byte(unsigned char ack); //SHT100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);//温湿度数据转换
extern void Delay(u32 nCount);
void Temperatuer(float *wendu,float *shidu) ;


extern u32 *wendu,*shidu;
//u8 a,b,c,d;
/*--------------------------------------
;模块名称:s_transstart();
;功 能:启动传输函数
;占用资源:--
;参数说明:--
;创建日期:2008.08.15
;版 本:FV1.0(函数版本Function Version)
;修改日期:--
;修改说明:--
;-------------------------------------*/
void s_transstart(void)
// generates a transmission start
// _____ ________
// DATA: |_______|
// ___ ___
// SCK : ___| |___| |______
{
GPIO_SetBits(GPIOB, DATA); //DATA=1,SCK=0
GPIO_ResetBits(GPIOB, SCK);
//Initial state
Delay(10);
GPIO_SetBits(GPIOB, SCK);// SCK=1;
Delay(10);
GPIO_ResetBits(GPIOB, DATA);// DATA=0;
Delay(10);
GPIO_ResetBits(GPIOB, SCK);//SCK=0;
Delay(30); //_nop_();_nop_();_nop_();
GPIO_SetBits(GPIOB, SCK);//SCK=1;
Delay(10);
GPIO_SetBits(GPIOB,DATA);//DATA=1;
Delay(10);
GPIO_ResetBits(GPIOB,SCK);//SCK=0;
Delay(10);
}

/*--------------------------------------
;模块名称:s_connectionreset();
;功 能:连接复位函数
;占用资源:--
;参数说明:--
;创建日期:2008.08.15
;版 本:FV1.0(函数版本Function Version)
;修改日期:--
;修改说明:--
;-------------------------------------*/
void s_connectionreset(void)
// communication reset: DATA-line=1 and at l

east 9 SCK cycles followed by transstart
// _____________________________________________________ ________
// DATA: |_______|
// _ _ _ _ _ _ _ _ _ ___ ___
// SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______
{
unsigned char i;
GPIO_SetBits(GPIOB,DATA); //DATA=1;
GPIO_ResetBits(GPIOB,SCK); // SCK=0;
for(i=0;i<9;i++) //9 SCK cycles
{
GPIO_SetBits(GPIOB, SCK); //SCK=1;
Delay(10);
GPIO_ResetBits(GPIOB, SCK);//SCK=0;
Delay(10);
}
s_transstart(); //transmission start
}


/*--------------------------------------
;模块名称:s_write_byte();
;功 能:DHT90写函数
;占用资源:--
;参数说明:--
;创建日期:2008.08.15
;版 本:FV1.0(函数版本Function Version)
;修改日期:--
;修改说明:--
;-------------------------------------*/
char s_write_byte(unsigned char value)
//----------------------------------------------------------------------------------
// writes a byte on the Sensibus and checks the acknowledge
{

unsigned char i, wrong=0;
for (i=0x80;i>0;i/=2) //shift bit for masking
{
if (i & value) GPIO_SetBits(GPIOB, DATA); //写数据
else GPIO_ResetBits(GPIOB, DATA);

GPIO_SetBits(GPIOB, SCK); //clk for SENSI-BUS
Delay(30);
GPIO_ResetBits(GPIOB, SCK);


}
GPIO_SetBits(GPIOB, DATA);
Delay(20);

GPIO_SetBits(GPIOB, SCK); //第九个上升沿 第9个上升沿后将数据线拉低表示写数据成功
Delay(20);

wrong=GPIO_ReadInputDataBit(GPIOB, DATA);
Delay(20);

GPIO_ResetBits(GPIOB, SCK); //第九个下降沿 第9个下降沿后自动释放数据线
Delay(20);

GPIO_SetBits(GPIOB, DATA); //释放数据线
return wrong; //error=1 in case of no acknowledge //返回：0成功，1失败

}


/*--------------------------------------
;模块名称:s_read_byte();
;功 能:DHT90读函数
;占用资源:--
;参数说明:--
;创建日期:2008.08.15
;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"
{

unsigned char i,val=0;
GPIO_SetBits(GPIOB, DATA); //release DATA-line
Delay(5);
for (i=0x80;i>0;i/=2)
{
GPIO_SetBits(GPIOB, SCK);
Delay(5); //稍微延时等待数据线稳定再读取
if (GPIO_ReadInputDataBit(GPIOB, DATA)) val=(val | i); //读数据

Delay(30); //脉冲宽度 3 us
GPIO_ResetBits(GPIOB, SCK);
}
Delay(5); //第8个下降沿后稍微延时
if(ack==1) GPIO_ResetBits(GPIOB, DATA); //in case of "ack==1" pull down DATA-Line
else GPIO_SetBits(GPIOB, DATA); //如果是校验(ack==0)，读取完后结束通讯
Delay(30); //pulswith approx 3 us
GPIO_SetBits(GPIOB, SCK); //第9个上升沿
Delay(30); //pulswith approx 3 us
GPIO_ResetBits(GPIOB, SCK); //第9个下降沿
Delay(30);
GPIO_SetBits(GPIOB, DATA); //release DATA-line
return val;
}




/*--------------------------------------
;模块名称:s_measure();
;功 能:测量温湿度函数
;占用资源:--
;参数说明:--
;创建日期:2008.08.15
;版 本:FV1.0(函数版本Function Version)
;修改日期:--
;修改说明:--
;-------------------------------------*/
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)
// makes a measurement (humidity/temperature) with checksum
{
unsigned char wrong=0;
unsigned int i;

s_transstart(); //transmission start
Delay(30);
switch(mode)
{ //send command to sensor
case 0 : wrong+=s_write_byte(MEASURE_TEMP); break;
case 1 : wrong+=s_write_byte(MEASURE_HUMI); break;
default : break;
}
for (i=0;i<500;i++)
{Delay(20);
if(GPIO_ReadInputDataBit(GPIOB, DATA)==0) break; // 等待传感器测量
}
Delay(0x8fffff);
if(GPIO_ReadInputDataBit(GPIOB, DATA)) wrong+=1; // or timeout (~2 sec.) is reached

*(p_value+1)=s_read_byte(ACK); //读高八位
*(p_value) =s_read_byte(ACK); //读低八位
*p_checksum =s_read_byte(noACK); //read checksum
return wrong;
}


/*--------------------------------------
;模块名称:calc_dht90();
;功 能:温湿度补偿函数
;占用资源:--
;参数说明:--
;创建日期:2008.08.15
;版 本:FV1.0(函数版本Function Version)
;修改日期:--
;修改说明:--
;-------------------------------------*/
void calc_sht10(float *p_humidity ,float *p_temperature)
// calculates temperature [C] and humidity [%RH]
// input : humi [Ticks] (12 bit)
// temp [Ticks] (14 bit)
// output: humi [%RH]
// temp [C]
{
const float C1=-4.0; // for 12 Bit
const float C2=+0.0405; // for 12 Bit
const float C3=-0.0000028; // for 12 Bit

// const float C1=-2.0468; // for 12 Bit
// const float C2=+0.036

7; // for 12 Bit
// const float C3=-0.0000015955; // for 12 Bit

const float T1=+0.01; // for 14 Bit @ 5V
const float T2=+0.00008; // for 14 Bit @ 5V

float rh=*p_humidity; // rh: Humidity [Ticks] 12 Bit
float t=*p_temperature; // t: Temperature [Ticks] 14 Bit
float rh_lin; // rh_lin: Humidity linear
float rh_true; // rh_true: Temperature compensated humidity
float t_C; // t_C : Temperature [C]

t_C=t*0.01 - 39.6; //calc. temperature from ticks to [C]
rh_lin=C3*rh*rh + C2*rh + C1; //calc. humidity from ticks to [%RH]
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; //the physical possible range

*p_temperature=t_C; //return temperature [C]
*p_humidity=rh_true; //return humidity[%RH]
}




//*********************第二部分DHT90设置 END****************************************

//**************************
void Temperatuer(float *wendu,float *shidu)
{
unsigned char w = 0;
value humi_val,temp_val;
unsigned char checksum;

s_connectionreset();

Delay(0x3fffff); //延时0.2s
w += s_measure((unsigned char*) &humi_val.i,&checksum,1); //measure humidity
w += s_measure((unsigned char*) &temp_val.i,&checksum,0); //measure temperature
if( w != 0 )
{
s_connectionreset(); //in case of an error: connection reset
}
else
{
humi_val.f=(float)humi_val.i; //converts integer to float
temp_val.f=(float)temp_val.i; //converts integer to float
calc_sht10(&humi_val.f,&temp_val.f); //calculate humidity, temperature
}
*wendu=temp_val.f;
*shidu=humi_val.f;


//Delay(0x9fffff); //延时约0.8s

}