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//*********主函數*****************
void main(void)
{
value humi_val,temp_val;
unsigned char error,checksum;
unsigned int wendu,shidu;
LCD_init();
s_connectionreset();
LCD_disp_str(0,1,"TE ");
LCD_disp_str(0,2,"RH ");
//*********初始化溫度顯示區*********
LCD_disp_str(2,1,"TTT.T C");
//*********初始化濕度顯示區*********
LCD_disp_str(2,2,"RRR.R%");
delay_n10us(20000); //延時0.2s
while(1)
{ error=0;
error+=s_measure((unsigned char*)&humi_val.i,&checksum,HUMI);
error+=s_measure((unsigned char*)&temp_val.i,&checksum,TEMP);
if(error!=0) s_connectionreset();
else
{ humi_val.f=(float)humi_val.i;
temp_val.f=(float)temp_val.i;
calc_SHT10(&humi_val.f,&temp_val.f);
wendu=10*temp_val.f;
LCD_disp_char(2,1,wendu/1000+'0'); //顯示溫度百位
LCD_disp_char(3,1,(wendu%1000)/100+'0'); //顯示溫度十位
LCD_disp_char(4,1,(wendu%100)/10+'0'); //顯示溫度個位
LCD_disp_char(6,1,(wendu%10)+'0'); //顯示溫度小數點后第一位
shidu=10*humi_val.f;
LCD_disp_char(2,2,shidu/1000+'0'); //顯示濕度百位
LCD_disp_char(3,2,(shidu%1000)/100+'0'); //顯示濕度十位
LCD_disp_char(4,2,(shidu%100)/10+'0'); //顯示濕度個位
LCD_disp_char(6,2,(shidu%10)+'0'); //顯示濕度小數點后第一位
}
delay_n10us(80000); //延時約0.8s
}
}
系統部分程序：
/*************定義接口********************
P0------DB0～DB7 (LCD1602)
P2.4------RS (LCD1602)
P2.5------RW (LCD1602)
P2.6------E (LCD1602)
P3.5------SOUNDER (蜂鳴器）
P3.6------SCK (SHT10) //時鐘
P3.7------DATA (SHT10) //數據
*****************************************/
#include <AT89x51.h>
#include <intrins.h>
#include <math.h> //Keil library
#include <stdio.h> //Keil library
#define TEMPUP 24 //溫度上限, 達到該溫度蜂鳴器報警
typedef unsigned char BYTE;
typedef unsigned int WORD;
typedef bit BOOL ;
/*******************************************/
sbit buzzer = P3^5; //蜂鳴器
BOOL start;
/******************************************/
//************第一部分LCD1602設置******
START*************************************/
#define LCD_DB P0
sbit LCD_RS=P2^5; //P2^5是p2.5
sbit LCD_RW=P2^6; //P2^6是p2.6
sbit LCD_E=P2^7; //P2^7是p2.7
/******定義函數****************/
#define uchar unsigned char
#define uint unsigned int
void LCD_init(void); //初始化函數
void LCD_write_command(ucharcommand); //寫指令函數
void LCD_write_data(uchardat); //寫數據函數
void LCD_disp_char(ucharx,uchar y,uchar dat);//在某個屏幕位置上顯示一個字符,X（0-15),y(1-2)
void LCD_disp_str(ucharx,uchar y,uchar *str); //LCD1602顯示字符串函數
void delay_n10us(uintn); //延時函數
/*--------------------------------------
;初始化LCD1602
;-------------------------------------*/
void LCD_init(void)
{
delay_n10us(10);
LCD_write_command(0x38);//設置8位格式，2行，5x7
delay_n10us(10);
LCD_write_command(0x0c);//整體顯示，關光標，不閃爍
delay_n10us(10);
LCD_write_command(0x06);//設定輸入方式，增量不移位
delay_n10us(10);
LCD_write_command(0x01);//清除屏幕顯示
delay_n10us(100); //延時清屏，延時函數，延時約n個10us
}
/*--------------------------------------
;LCD1602寫指令函數
;-------------------------------------*/
void LCD_write_command(uchardat)
{
delay_n10us(10);
LCD_RS=0; //指令
LCD_RW=0; //寫入
LCD_E=1; //允許
LCD_DB=dat;
delay_n10us(10);
LCD_E=0;
delay_n10us(10);
}
/*--------------------------------------
;LCD1602寫數據函數
;-------------------------------------*/
void LCD_write_data(uchardat)
{
delay_n10us(10);
LCD_RS=1; //數據
LCD_RW=0; //寫入
LCD_E=1; //允許
LCD_DB=dat;
delay_n10us(10);
LCD_E=0;
delay_n10us(10);
}
/*--------------------------------------
;LCD1602顯示一個字符函數，在某個屏幕位置上顯示一個字符,X（0-15),y(1-2)。
;-------------------------------------*/
void LCD_disp_char(ucharx,uchar y,uchar dat)
{
uchar address;
if(y==1)
address=0x80+x;
else
address=0xc0+x;
LCD_write_command(address);
LCD_write_data(dat);
}
/*--------------------------------------
;LCD1602顯示字符串函數，在某個屏幕起始位置{X（0-15),y(1-2)}上顯示一個字符串。
;-------------------------------------*/
void LCD_disp_str(ucharx,uchar y,uchar *str)
{
uchar address;
if(y==1)
address=0x80+x;
else
address=0xc0+x;
LCD_write_command(address);
while(*str!='\0')
{
LCD_write_data(*str);
str++;
}
}
/*--------------------------------------
;延時函數，延時約n個10us
;-------------------------------------*/
void delay_n10us(uintn) //延時n個10us@12M晶振
{
uint i;
for(i=n;i>0;i--)
{
_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
}
}
//***************第一部分LCD1602設置*******
END****************************************
//*************第二部分SHT10設置*************
START****************************************
sbit SCK = P3^6; //定義通訊時鐘端口
sbit DATA = P3^7; //定義通訊數據端口
typedef union
{ unsigned int i; //定義了兩個共用體
float f;
} value;
enum {TEMP,HUMI}; //TEMP=0,HUMI=1
#define noACK 0 //用于判斷是否結束通訊
#define ACK 1 //結束數據傳輸
//adr command r/w
#define STATUS_REG_W0x06 //000 0011 0
#define STATUS_REG_R0x07 //000 0011 1
#define MEASURE_TEMP0x03 //000 0001 1
#define MEASURE_HUMI0x05 //000 0010 1
#define RESET 0x1e //000 1111 0
/****************定義函數****************/
voids_transstart(void); //啟動傳輸函數
voids_connectionreset(void); //連接復位函數
char s_write_byte(unsignedchar value);//SHT10寫函數
char s_read_byte(unsignedchar ack); //SHT10讀函數
char s_measure(unsigned char*p_value, unsigned char *p_checksum, unsigned char mode);//測量溫濕度函數
void calc_SHT10(float*p_humidity ,float *p_temperature);//溫濕度補償
/*--------------------------------------
;啟動傳輸函數
;-------------------------------------*/
void s_transstart(void)
// generates a transmissionstart
// _____ ________
// 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;
}
/*--------------------------------------
;連接復位函數
;-------------------------------------*/
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
}
/*--------------------------------------
;SHT10寫函數
;-------------------------------------*/
char s_write_byte(unsignedchar value)
//----------------------------------------------------------------------------------
// writes a byte on theSensibus 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 toSENSI-BUS
elseDATA=0;
SCK=1; //clk for SENSI-BUS
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
SCK=0;
}
DATA=1; //release DATA-line
SCK=1; //clk #9for ack
error=DATA; //check ack (DATA willbe pulled down by SHT10),DATA在第9個上升沿將被SHT10自動下拉為低電
_nop_();_nop_();_nop_();
SCK=0;
DATA=1; //release DATA-line
return error; //error=1 in case of noacknowledge //返回：0成功，1失敗
}
/*--------------------------------------
;SHT10讀函數
;-------------------------------------*/
char s_read_byte(unsignedchar ack)
// reads a byte form theSensibus 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
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
SCK=0;
}
if(ack==1)DATA=0; //in case of"ack==1" pull down DATA-Line
else DATA=1; //如果是校驗(ack==0)，讀取完后結束通訊
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
SCK=1; //clk #9 for ack
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
SCK=0;
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
DATA=1; //release DATA-line
return val;
}
/*--------------------------------------
;測量溫濕度函數
;-------------------------------------*/
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
caseTEMP :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.) isreached
*(p_value) =s_read_byte(ACK); //read thefirst byte (MSB)
*(p_value+1)=s_read_byte(ACK); //read the second byte (LSB)
*p_checksum =s_read_byte(noACK); //read checksum
return error;
}
/*--------------------------------------
;溫濕度補償函數
;-------------------------------------*/
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 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: Temperaturecompensated humidity
float t_C; // t_C : Temperature [C]
t_C=t*0.01 - 40; //calc. temperature fromticks 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SHT10設置***************
//END****************************************

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