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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