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#include<reg52.h> #include<intrins.h> #define uchar unsigned char #define uint unsigned int #define Data P0 //數(shù)據(jù)端口 sbit RS=P2^4; sbit RW=P2^5; sbit E=P2^6; sbit DHT=P1^0; uchar FirstLine[] ="wen:00.00"; //第一行數(shù)據(jù) uchar SecondLine[]="shi:00.00"; //第二行數(shù)據(jù) unsigned char shiZ,shiX,wenZ,wenX,check; unsigned char tr_shiZ,tr_shiX,tr_wenZ,tr_wenX; unsigned char flag; unsigned int n=20,m; void delay_1ms(unsigned int i) { unsigned int j=88; for(;i>0;i--) { while(j>0)j--; } } void delay_10us() { unsigned char i; i--; i--; i--; i--; i--; i--; } /******************************************/ /*************溫濕度讀取函數(shù)***************/ /******************************************/ char read_data() { unsigned char i,num,temp; num=0; for(i=0;i<8;i++) { flag=2; while((!DHT)&&flag++); delay_10us(); delay_10us(); delay_10us(); if(DHT==1) { temp=1; flag=2; while(DHT&&flag++); } else temp=0; num<<=1; num|=temp; } return(num); } void delay(uchar ms) // 延時函數(shù)ms毫秒 { uchar i,j; for(i=ms;i>0;i--) for(j=100;j>0;j--); } void DelayUs(unsigned char us) //--延時函數(shù) { unsigned char uscnt; uscnt=us>>1; /*12MHz頻率*/ while(--uscnt); } void DelayMs(unsigned char ms) { while(--ms) { DelayUs(250); DelayUs(250); DelayUs(250); DelayUs(250); } } void lcd_write_com(uchar c) //寫命令 { DelayMs(5);//操作前短暫延時，保證信號穩(wěn)定 E=0; RS=0; RW=0; _nop_(); E=1; Data=c; E=0; } void lcd_write_dat(uchar c) //寫數(shù)據(jù) { DelayMs(5); //操作前短暫延時，保證信號穩(wěn)定 E=0; RS=1; RW=0; _nop_(); E=1; Data=c; E=0; RS=0; } void lcd_init() //LCD初始化 { DelayMs(15); lcd_write_com(0x38); //display mode lcd_write_com(0x38); //display mode lcd_write_com(0x38); //display mode lcd_write_com(0x06); //顯示光標移動位置 lcd_write_com(0x0c); //顯示開及光標設(shè)置 lcd_write_com(0x01); //顯示清屏 } void ShowChar(uchar pos,uchar c) //顯示單個字符 { unsigned char p; if (pos>=0x10) p=pos+0xb0; //是第二行則命令代碼高4位為0xc else p=pos+0x80; //是第二行則命令代碼高4位為0x8 lcd_write_com(p);//寫命令 lcd_write_dat(c); //寫數(shù)據(jù) } void ShowString (uchar line,char *ptr) //顯示字符串 { unsigned char l,*p; p=ptr; l=line<<4; while((*p)!='\0') { ShowChar(l++,*(p)); p++; } } void disp(void) //主函數(shù)調(diào)用的顯示函數(shù) { ShowString(0,FirstLine); ShowString(1,SecondLine); } /******************************************/ /************初始化及采集程序**************/ /******************************************/ void read_init() { DHT=0; //主機使DHT11低電平并延時至少18ms delay_1ms(21); DHT=1; //主機置DHT11高電平20~40us,并等待從機相應(yīng) delay_10us(); delay_10us(); delay_10us(); delay_10us(); DHT=1; if(!DHT) //從機發(fā)出相應(yīng)信號 { flag=2; while((!DHT)&&flag++); flag=2; while(DHT&&flag++); //開始采集數(shù)據(jù) tr_shiZ=read_data();//采集濕度整數(shù)部分 tr_shiX=read_data();//采集濕度小數(shù)部分 tr_wenZ=read_data();//采集溫度整數(shù)部分 tr_wenX=read_data();//采集溫度小數(shù)部分 check=read_data(); //采集校驗位 DHT=1; } } void main() { unsigned char temp; lcd_init(); delay(50); while(1) { disp(); read_init(); temp=tr_shiZ+tr_shiX+tr_wenZ+tr_wenX; if(check==temp) { shiZ=tr_shiZ; shiX=tr_shiX; wenZ=tr_wenZ; wenX=tr_wenX; } FirstLine[4]='0'+wenZ/10; FirstLine[5]='0'+wenZ%10; FirstLine[8]='0'+wenX/10; FirstLine[9]='0'+wenX%10; SecondLine[4]='0'+shiZ/10; SecondLine[5]='0'+shiZ%10; SecondLine[8]='0'+shiX/10; SecondLine[9]='0'+shiX%10; } }
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