sht10温湿度传感器说明.

温湿度传感器SHT10驱动程序——基于MSP430这是暑假时用430的单片机写的温湿度传感器SHT10的程序，参考了官方的51例程，分享一下~~/****************************************Copyright(c)********************************************************************************************LiPeng********************* *************************************--------------FileInfo-------------------------------------------------------------------------------** File Name: Sht10_Driver.c** Created by: LiPeng** Created date: 2008-09-15** Version: 1.0** Descriptions: The original version****------------------------------------------------------------------------------------------------------** Modified by:** Modified date:** Version:** Descriptions:****------------------------------------------------------------------------------------------------------** System Function: Sht10 Driver------温湿度传感器SHT10驱动** 使用MSP430-F413连接方式:** VCC: P6.3** SCK: P6.4** SDA: P6.5*********************************************************************** ***********************************/#include <msp430x14x.h>/*宏定义，延时函数，参数为1时相应延时分别为1us和1ms*/#define CPU_F (double)1000000#define delay_us(x) __delay_cycles((long)(CPU_F * (double)x/1000000.0)) #define delay_ms(x) __delay_cycles((long)(CPU_F * (double)x/1000.0))/*常量定义*/#define uint unsigned int#define uchar unsigned char#define ulong unsigned long//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#define bitselect 0x01 //选择温度与湿度的低位读#define noACK 0#define ACK 1#define HUMIDITY 2#define TEMPERATURE 1#define SCK BIT4#define SDA BIT5#define SVCC BIT3#define SCK_H P6OUT|=SCK#define SCK_L P6OUT&=~SCK#define SDA_H P6OUT|=SDA#define SDA_L P6OUT&=~SDA#define SVCC_H P6OUT|=SVCC#define SVCC_L P6OUT&=~SVCCtypedef union{unsigned int i;float f;}value;uint table_temp[3];uint table_humi[3];uint temten;uint humi_true;/******************************************************************** ****************************************Function Name: S_Init**Description: 初始化**Input Parameters: 无**Output Parameters: 无*************************************/void S_Init(){P6SEL&=~(SCK+SDA+SVCC); //选择P6.3 P6.4 为IO端口，输出 P6.5输入P6DIR|=(SCK+SVCC);P6DIR&=~SDA;BCSCTL1=(XT2OFF+RSEL2); //关闭XT2，1MHz DOCDCOCTL=DCO2; //设定DCO频率为1MHz}/******************************************************************** ****************************************Function Name: S_Transstart**Description: 发送开始时序**** generates a transmission start** _____ ________** DATA: |_______|** ___ ___** SCK : ___| |___| |______**Input Parameters: 无**Output Parameters: 无********************************************************************* *************************************/void S_Transstart(){P6DIR|=SDA;SDA_H;SCK_L;_NOP();SCK_H;_NOP();SDA_L;_NOP();SCK_L;_NOP();_NOP();_NOP();SCK_H;_NOP();SDA_H;_NOP();SCK_L;P6DIR&=~SDA;}****************************************Function Name: S_WriteByte**Description: 写时序**Input Parameters: 无**Output Parameters: 无********************************************************************* *************************************/char S_WriteByte(unsigned char value){unsigned char i,error=0;P6DIR|=SDA;for(i=0x80;i>0;i/=2) //shift bit for masking{if(i&value)SDA_H; //masking value with i , write to SENSI-BUSelseSDA_L;SCK_H; //clk for SENSI-BUS_NOP();_NOP();_NOP(); //pulswith approx. 5 usSCK_L;}SDA_H; //release DATA-lineP6DIR&=~SDA; //Change SDA to be inputSCK_H; //clk #9 for ackerror=P6IN; //check ack (DATA will be pulled down by SHT11)error&=SDA;P6DIR|=SDA;SCK_L;if(error)return 1; //error=1 in case of no acknowledgereturn 0;}/******************************************************************** ****************************************Function Name: S_ReadByte**Description: 读时序**Input Parameters: ack--->reads a byte form the Sensibus and gives an acknowledge in case of "ack=1"**Output Parameters: 无********************************************************************* *************************************/char S_ReadByte(unsigned char ack){unsigned char i,val=0;P6DIR|=SDA;SDA_H; //release DATA-lineP6DIR&=~SDA;for(i=0x80;i>0;i/=2) //shift bit for masking{SCK_H; //clk for SENSI-BUSif(P6IN&SDA)val=(val|i); //read bitSCK_L;}P6DIR|=SDA;if(ack) //in case of "ack==1" pull down DATA-LineSDA_L;elseSDA_H;SCK_H; //clk #9 for ack_NOP();_NOP();_NOP(); //pulswith approx. 5 usSCK_L;SDA_H; //release DATA-lineP6DIR&=~SDA;return val;}/******************************************************************** ****************************************Function Name: S_Connectionreset**Description: 通讯复位时序** communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart** _____________________________________________________ ________** DATA: |_______|** _ _ _ _ _ _ _ _ _ ___ ___** SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______ **Input Parameters: 无**Output Parameters: 无********************************************************************* *************************************/void S_Connectionreset(){unsigned char ClkCnt;P6DIR|=SDA;SDA_H;SCK_L; //Initial statefor(ClkCnt=0;ClkCnt<9;ClkCnt++) //9 SCK cycles{SCK_H;SCK_L;}S_Transstart(); //transmission start}/******************************************************************** ****************************************Function Name: S_Softreset**Description: 软件复位时序resets the sensor by a softreset**Input Parameters: 无**Output Parameters: 无********************************************************************* *************************************/char S_Softreset(){unsigned char error=0;S_Connectionreset(); //reset communicationerror+=S_WriteByte(RESET); //send RESET-command to sensorreturn error; //error=1 in case of no response form the sensor}/******************************************************************** ****************************************Function Name: S_WriteStatusReg**Description: 写状态寄存器**Input Parameters: *p_value**Output Parameters: 无********************************************************************* *************************************/char S_WriteStatusReg(unsigned char *p_value){unsigned char error=0;S_Transstart(); //transmission starterror+=S_WriteByte(STATUS_REG_W); //send command to sensorerror+=S_WriteByte(*p_value); //send value of status registerreturn error; //error>=1 in case of no response form the sensor}/******************************************************************** ****************************************Function Name: S_Mearsure**Description: 读时序 makes a measurement (humidity/temperature) withchecksum**Input Parameters: *p_value ,*p_checknum ,mode**Output Parameters: 无********************************************************************* *************************************/unsigned char S_Measure(unsigned char *p_value, unsigned char*p_checksum, unsigned char mode){unsigned error=0;unsigned int i;S_Transstart(); //transmission startswitch(mode){ //send command to sensorcase TEMPERATURE: error+=S_WriteByte(MEASURE_TEMP); break;case HUMIDITY: error+=S_WriteByte(MEASURE_HUMI); break;}P6DIR&=~SDA;for(i=0;i<65535;i++) //wait until sensor has finished the measurement if((P6IN&SDA)==0)break;if(P6IN&SDA)error+=1; //or timeout (~2 sec.) is reached*(p_value)=S_ReadByte(ACK); //read the first byte (MSB)*(p_value+1)=S_ReadByte(ACK); //read the second byte (LSB)*p_checksum=S_ReadByte(noACK); //read checksumreturn(error);}/******************************************************************** ****************************************Function Name: S_Calculate**Description: 计算**Input Parameters: humi [Ticks] (12 bit)** temp [Ticks] (14 bit)**Output Parameters: humi [%RH]** temp [癈]********************************************************************* *************************************/void S_Calculate(unsigned int *p_humidity ,unsigned int *p_temperature) {const float C1=-4.0; // for 8 Bitconst float C2=+0.648; // for 8 Bitconst float C3=-0.0000072; // for 8 Bitconst float D1=-39.6; // for 12 Bit @ 3Vconst float D2=+0.04; // for 12 Bit @ 3Vconst float T1=0.01; // for 8 bitconst float T2=0.00128; // for 8 bitfloat rh=*p_humidity; // rh: Humidity [Ticks] 12 Bitfloat t=*p_temperature; // t: Temperature [Ticks] 14 Bitfloat rh_lin; // rh_lin: Humidity linearfloat rh_true; // rh_true: Temperature compensated humidityfloat t_C; // t_C : Temperature [癈]t_C=t*D2+D1; //calc. temperature from ticks to [癈]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 ofif(rh_true<0.1)rh_true=0.1; //the physical possible range*p_temperature=t_C; //return temperature [癈]*p_humidity=rh_true; //return humidity[%RH]}void main(){value humi_val,temp_val;unsigned char error,checksum;unsigned int i,temphigh,templow;unsigned int RegCMD=0x01;WDTCTL=WDTPW+WDTHOLD; //Stop watchdog timer to prevent time out resetS_Init();SVCC_H;S_Connectionreset();S_WriteStatusReg((unsigned char *)&RegCMD);while(1){error=0;error+=S_Measure((unsigned char*) &humi_val.i,&checksum,HUMIDITY);//measure humidityerror+=S_Measure((unsigned char*) &temp_val.i,&checksum,TEMPERATURE); //measure temperatureif(error!=0)S_Connectionreset(); //in case of an error: connection resetelse{templow=(humi_val.i&0xff00);humi_val.i=templow>>8;temphigh=((temp_val.i&0xf)<<8);templow=((temp_val.i&0xff00)>>8);temp_val.i=temphigh+templow;S_Calculate(&humi_val.i,&temp_val.i); //calculate humidity, temperature//temp_val_NOP();//printf("temp:%5.1fC humi:%5.1f%% dewpoint:%5.1fC\n",temp_val.f,humi_val.f,dew_point);}//----------wait approx. 0.8s to avoid heating upSHTxx------------------------------for (i=0;i<40000;i++); //(be sure that the compiler doesn't eliminate this line!)//-----------------------------------------------------------------------------------}}。

SHT10温湿度传感器的通信协议命令包含：1.读取站号命令2.写站号命令3.读取数据4.手动矫正数据串口参数设置：读站号命令(固定命令)主站从站地址功能码H地址L地址 H数据L数据 CRC00 03 00 01 00 01 CRClo CRChi 从站从站地址功能码H地址L地址H数据CRC00 03 02 00 XX CRClo CRChi 注：返回帧与主站相同设备地址：（XX=01-FF）示例：命令00 03 00 01 00 01 D4 1B（固定命令）回复00 03 02 00 FF C5 C4 （设备默认站号FF）写站号命令主站从站地址功能码H地址L地址寄存器个数寄存器个数数据长度数据CRC00 10 00 01 00 01 02 00 XX CRClo CRChi 注：（XX=0X01-0XFF）从站从站地址功能码 H地址L地址寄存器个数CRC00 10 00 01 00 01 CRClo CRChi 示例：命令00 10 00 01 00 01 02 00 33 EA 04回复00 10 00 01 00 01 51 D8读数据主站从站地址功能码 H地址L地址寄存器个数寄存器个数CRCXX 03 00 00 00 02 CRClo CRChi注：（XX=0X01-0XFF）从站从站地址功能码数据长度数据数据CRCXX 03 04 19 AD 1B E4 CRClo CRCh 示例命令FF 03 00 00 00 02 D1 D5回复FF 03 04 19 AD 1B E4 79 FA注：温度：第4，5个字节19 AD温度=读数/100-40度湿度：第5，6个字节1B E4。