1、/*端口定義* P1.0-SCK (SHT10) P1.1-DATA (SHT10) P0-DB0DB7 (LCD1602) P2.0-RS (LCD1602) P2.1-RW (LCD1602) P2.2-E (LCD1602)*/#include <reg52.h>#include <intrins.h>#include <stdio.h>#include <string.h>#include <absacc.h>#include <math.h>#define uchar unsigned char#define u

2、int unsigned int/按鍵設置sbit TEM_UP = P12;sbit TEM_DOWN = P13;sbit HUM_UP = P14;sbit HUM_DOWN = P15;sbit SHEZHI_ENTER = P16;sbit SHEZHI_EXIT = P17;float f_tem_up_value = 50.0;float f_tem_down_value = -30.0;float f_hum_up_value = 10.0;float f_hum_down_value = 100.0;/1602液晶端口定義 *sbit LcdRs= P20;sbit LcdR

3、w= P21;sbit LcdEn= P22;sbit ACC0 = ACC0;sbit ACC7 = ACC7;uchar str7;/向LCD寫入命令或數據*#define LCD_COMMAND0 / Command#define LCD_DATA1 / Data#define LCD_CLEAR_SCREEN0x01 / 清屏#define LCD_HOMING 0x02 / 光標返回原點/設置顯示模式*#define LCD_SHOW0x04 /顯示開#define LCD_HIDE0x00 /顯示關 #define LCD_CURSOR0x02 /顯示光標#define LCD_N

4、O_CURSOR0x00 /無光標 #define LCD_FLASH0x01 /光標閃動#define LCD_NO_FLASH 0x00 /光標不閃動/設置輸入模式*#define LCD_AC_UP0x02#define LCD_AC_DOWN0x00 / default#define LCD_MOVE0x01 / 畫面可平移#define LCD_NO_MOVE0x00 /defaultunsigned char LCD_Wait(void);void LCD_Write(bit style, unsigned char input);/*1602液晶顯示部分子程序*/void del

5、ay(uint z)uint x,y;for(x=z;x>0;x-)for(y=110;y>0;y-);void LCD_Write(bit style, unsigned char input)LcdRs=style;P0=input; delay(5);LcdEn=1;delay(5);LcdEn=0;void LCD_SetDisplay(unsigned char DisplayMode)LCD_Write(LCD_COMMAND, 0x08|DisplayMode);void LCD_SetInput(unsigned char InputMode)LCD_Write(L

6、CD_COMMAND, 0x04|InputMode);/初始化LCD*void LCD_Initial()LcdEn=0;LCD_Write(LCD_COMMAND,0x38); /8位數據端口,2行顯示,5*7點陣LCD_Write(LCD_COMMAND,0x38);LCD_SetDisplay(LCD_SHOW|LCD_NO_CURSOR); /開啟顯示, 無光標LCD_Write(LCD_COMMAND,LCD_CLEAR_SCREEN); /清屏LCD_SetInput(LCD_AC_UP|LCD_NO_MOVE); /AC遞增, 畫面不動/液晶字符輸入的位置*void GotoX

7、Y(unsigned char x, unsigned char y)if(y=0)LCD_Write(LCD_COMMAND,0x80|x);if(y=1)LCD_Write(LCD_COMMAND,0x80|(x-0x40);/將字符輸出到液晶顯示void Print(unsigned char *str)while(*str!='0')LCD_Write(LCD_DATA,*str);str+;void zhuanhuan(float a)/浮點數轉換成字符串函數 memset(str,0,sizeof(str);sprintf (str,"%f",

8、a); void welcome()LCD_Initial();GotoXY(0,0);Print(" Welcome! ");GotoXY(0,1);Print(" Code of sht10 ");delay(200);/*- ;模塊名稱:delay_n10us(); ;功 能:延時函數，延時約n個10us較精確的延時函數,"_nop_()"延時1us12M晶振;-*/void delay_n10us(uint n) /延時n個10us12M晶振 uint i; for(i=n;i>0;i-) _nop_();_nop_()

9、;_nop_();_nop_();_nop_();_nop_(); /*第一部分LCD1602設置 END*/*第二部分DHT90設置 START* sbit SCK = P10; /定義通訊時鐘端口sbit DATA = P11; /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_W

10、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 /*定義函數*/void s_transstart(void); /啟動傳輸函數void s_connectionreset(void); /連接復位函數char s_write_byte(unsigned char value);/DHT90寫函數char s_read_b

11、yte(unsigned char ack); /DHT90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_dht90(float *p_humidity ,float *p_temperature);/溫濕度補償/*- ;模塊名稱:s_transstart(); ;功 能:啟動傳輸函數;-*/ void s_transstart(void) / generates a transmission start / _ _ / DAT

12、A: |_| / _ _ / 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; /*- ;模塊名稱:s_connectionreset(); ;功 能:連接復位函數;-*/ void s_connectionreset(void) / communication reset: DATA-line=1 and at least 9

13、 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 /*- ;模塊名稱:s_write_byte(); ;功 能:SHT10寫函數

14、;-*/ 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

15、_();_nop_(); /pulswith approx. 3 us SCK=0; DATA=1; /release DATA-line SCK=1; /clk #9 for ack error=DATA; /check ack (DATA will be pulled down by DHT90),DATA在第9個上升沿將被DHT90自動下拉為低電平。 _nop_();_nop_();_nop_(); SCK=0; DATA=1; /release DATA-line return error; /error=1 in case of no acknowledge /返回：0成功，1失敗

16、/*- ;模塊名稱:s_read_byte(); ;功 能:SHT10讀函數;-*/ 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)

17、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 u

18、s SCK=0; _nop_();_nop_();_nop_(); /pulswith approx. 3 us DATA=1; /release DATA-line return val; /*- ;模塊名稱:s_measure(); ;功 能: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; u

19、nsigned 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 measureme

20、nt 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; /*- ;模塊名稱:calc_dht90(); ;功 能:溫濕度補償函數;-*/ void calc_dht90(float *p_h

21、umidity ,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

22、 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 - 40; /calc

23、. 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/*主函數*void main(void)value humi_val,temp_val; unsigned char error,checksum; LcdRw=0; s_connectionreset(); welcome();/顯示歡迎畫面 delay(2000);LCD_Initial(); while(1) / shezh