sht10的51程序精心挑选必成功版本下载_Word模板_14

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sht10的51程序精心挑选必成功版本sht10的51程序精心挑选必成功版本 //通常网上这些例程都是一大堆而且传感器的驱动程序都是一样的为什么拿到自己的板 //子就不行呢很有可能是因为没有上拉电阻这个IIC通信的sht10 如果读出来的数不对那 //么最好在SCK和DATA上拉两个4.7k到10k的电阻另外还要把串口波特率调对 9600 用 //字符显示 #include //Microcontroller specific library, e.g. port definitions #include //Keil library (...

sht10的51程序精心挑选必成功版本 //通常网上这些例程都是一大堆而且传感器的驱动程序都是一样的为什么拿到自己的板 //子就不行呢很有可能是因为没有上拉电阻这个IIC通信的sht10 如果读出来的数不对那 //么最好在SCK和DATA上拉两个4.7k到10k的电阻另外还要把串口波特率调对 9600 用 //字符显示 #include //Microcontroller specific library, e.g. port definitions #include //Keil library (is used for _nop()_ operation) #include //Keil library #include //Keil library typedef union { unsigned int i; float f; } value; //-------------------------- #define uchar unsigned char #define uint unsigned int #define NOP _nop_() //------------------------------- //---------------------------------------------------------------------------------- // modul-var //---------------------------------------------------------------------------------- enum {TEMP,HUMI}; sbit DATA =P1^5; sbit SCK =P1^6; #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 bit BJ1=0; unsigned char JS1=0; sbit LED=P0^4; sbit FAN=P2^4; unsigned char SOU[25]={0}; //---------------------------------------------------------------------------------- char s_write_byte(unsigned char value) //---------------------------------------------------------------------------------- // writes a byte on the Sensibus and checks the acknowledge { 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 } //---------------------------------------------------------------------------------- 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; 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; } //---------------------------------------------------------------------------------- void s_transstart(void) //---------------------------------------------------------------------------------- // generates a transmission start // _____ ________ // DATA: |_______| // ___ ___ // SCK : ___| |___| |______ { 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; } //---------------------------------------------------------------------------------- void s_connectionreset(void) //---------------------------------------------------------------------------------- // communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart // _____________________________________________________ ________ // DATA: |_______| // _ _ _ _ _ _ _ _ _ ___ ___ // SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______ { 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 } //---------------------------------------------------------------------------------- char s_softreset(void) //---------------------------------------------------------------------------------- // resets the sensor by a softreset { unsigned char error=0; 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 } //---------------------------------------------------------------------------------- char s_read_statusreg(unsigned char *p_value, unsigned char *p_checksum) //---------------------------------------------------------------------------------- // reads the status register with checksum (8-bit) { unsigned char error=0; s_transstart(); //transmission start error=s_write_byte(STATUS_REG_R); //send command to sensor *p_value=s_read_byte(ACK); //read status register (8-bit) *p_checksum=s_read_byte(noACK); //read checksum (8-bit) return error; //error=1 in case of no response form the sensor } //---------------------------------------------------------------------------------- char s_write_statusreg(unsigned char *p_value) //---------------------------------------------------------------------------------- // writes the status register with checksum (8-bit) { unsigned char error=0; s_transstart(); //transmission start error+=s_write_byte(STATUS_REG_W);//send command to sensor error+=s_write_byte(*p_value); //send value of status register return error; //error>=1 in case of no response form the sensor } //---------------------------------------------------------------------------------- char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode) //---------------------------------------------------------------------------------- // makes a measurement (humidity/temperature) with checksum { 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; case HUMI : error+=s_write_byte(MEASURE_HUMI); break; 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) *(p_value+1)=s_read_byte(ACK); //read the second byte (LSB) *p_checksum =s_read_byte(noACK); //read checksum return error; } //---------------------------------------------------------------------------------- /*void init_uart() //---------------------------------------------------------------------------------- //9600 bps @ 11.059 MHz { TMOD = 0x20; SCON = 0x50; TH1 = 0xFD; TL1 = TH1; PCON = 0x00; EA = 1; ES = 1; TR1 = 1; }*/ void init_uart() //---------------------------------------------------------------------------------- //9600 bps @ 11.059 MHz { SCON = 0x52; TMOD = 0x20; TCON = 0x69; TH1 = 0xfd; } //*********串口数据发送****************** //--------------------------------------- void SeriPushSend(uchar N,uchar *YS) { char i; for(i=0;i100)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] } //-------------------------------------------------------------------- float calc_dewpoint(float h,float t) { float logEx,dew_point ; logEx=0.66077+7.5*t/(237.3+t)+(log10(h)-2) ; dew_point=(logEx-0.66077)*237.3/(0.66077+7.5-logEx); return dew_point; } //---------------------------------------------------------------------------------- void main() //---------------------------------------------------------------------------------- // sample program that shows how to use SHT11 functions // 1. connection reset // 2. measure humidity [ticks](12 bit) and temperature [ticks](14 bit) // 3. calculate humidity [%RH] and temperature [C] // 4. calculate dew point [C] // 5. print temperature, humidity, dew point { value humi_val,temp_val; float dew_point; unsigned char error,checksum; unsigned int i; init_uart(); s_connectionreset(); while(1) { error=0; error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI); //measure humidity error+=s_measure((unsigned char*) &temp_val.i,&checksum,TEMP); //measure temperature printf("hello") ; if(error!=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_sth11(&humi_val.f,&temp_val.f); //calculate humidity, temperature dew_point=calc_dewpoint(humi_val.f,temp_val.f); //calculate dew point printf("temp:%5.1fc humi:%5.1f%% dew_point:%5.1fc\n",temp_val.f,humi_val.f,dew_point); } //----------wait approx. 0.8s to avoid heating up SHTxx------------------------------ for (i=0;i<40000;i++); //(be sure that the compiler doesn’t eliminate this line!) //----------------------------------------------------------------------------------- } } //----------------------------------------------------------------------------------- //--------------------------------------- void RS232_INT(void) interrupt 4 { if (RI) { RI=0; BJ1=1; EA=0; //串口接收中断函数中，跳入中断时最好把EA关掉，处理完后在将EA 置位 if(1==BJ1) { SOU[JS1]=SBUF; JS1++; if(JS1>=15) JS1=0; } EA=1; } else TI = 0; } //--------------------------------------

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