單片機(jī)課設(shè)單片機(jī)課設(shè)#rw=0;ep=0;P1=dat;ep=1;ep=0;}voidlcd_init()//初始化{write_cmd(0x38);delay(1);write_cmd(0x08);delay(1);write_cmd(0x01);delay(1);write_cmd(0x06);delay(1);write_cmd(0x0c);delay(1);}voiddisplay(ucharaddr,ucharq)〃在某一地址上顯示一字節(jié){delay(10);write_addr(addr);write_byte(q);longdelay(2);}voidstart()〃開始信號(hào){io=1;delay1();io=0;delay(20);//>18msio=1;delay1();//20-40usdelay1();delay1();delay1();delay1();}ucharreceive_byte()〃接收一個(gè)字節(jié){uchari,temp,count;for(i=0;i<8;i++){count=2;while((!io)&&count++)〃等待50us低電平結(jié)束temp=0;delay1();delay1();delay1();delay1();if(io==1)temp=1;count=2;while((io)&&count++);if(count==1)break;data_byte<<=1;data_byte|=temp;}returndata_byte;}voidreceive。//接收數(shù)據(jù){ucharT_H,T_L,R_H,R_L,check,num_check;ucharcount;start();〃開始信號(hào)io=1;if(!io)〃讀取DHT11響應(yīng)信號(hào){count=2;while((!io)&&count++);//DHT11高電平80us是否結(jié)束count=2;while((io)&&count++);R_H=receive_byte();R_L=receive_byte();T_H=receive_byte();T_L=receive_byte();check=receive_byte();io=0;〃拉低延時(shí)50usdelay1();delay1();delay1();delay1();delay1();io=1;num_check=R_H+R_L+T_H+T_L;if(num_check=check){RH=R_H;RL=R_L;TH=T_H;TL=T_L;check=num_check;}}}voidmain(){lcd_init();delay(10);while(1){receive();delay(100);display(0x00,'R');display(0x01,':');display(0x02,RH/10+0x30);display(0x03,RH%10+0x30);display(0x04,'%');display(0x40,'T');display(0x41,':');display(0x42,TH/10+0x