代碼:

1. #include <reg52.h>
   
2. #define uint unsigned int
   
3. #define uchar unsigned char
   
4. typedef bit BOOL;
   
5. sbit io = P2^0;
   
6. sbit rs = P2^6;  
   
7. sbit rw = P2^5;
   
8. sbit ep = P2^7;
   
9. uchar data_byte;
   
10. uchar RH,RL,TH,TL;
    
11. /********延時(shí)模塊***********/
    
12. void delay(uchar ms)
    
13. {  // 延時(shí)子程序
    
14. uchar i;
    
15. while(ms--)
    
16. {
    
17.   for(i = 0;i<250;i++);  
    
18. }
    
19. }
    
20. void delay1()//延時(shí)10us
    
21. {
    
22. uchar i;
    
23. i--;
    
24. i--;
    
25. i--;
    
26. i--;
    
27. i--;
    
28. i--;
    
29. }
    
30. void longdelay(uchar s) //長(zhǎng)延時(shí)
    
31. {
    
32. while(s--)
    
33. {
    
34.   delay(60);
    
35. }
    
36. }
    
37. BOOL lcd_bz()//測(cè)試LCD忙碌狀態(tài)
    
38. {
    
39. BOOL result;  
    
40. rs = 0;  
    
41. rw = 1;
    
42. ep = 1;
    
43. result = (BOOL)(P0 & 0x80);
    
44. ep = 0;  
    
45. return result;  
    
46. }
    
47. void write_cmd(uchar cmd)// 寫指令
    
48. {  
    
49. while(lcd_bz());
    
50. rs = 0;
    
51. rw = 0;
    
52. ep = 0;
    
53. P0 = cmd;
    
54. ep = 1;
    
55. ep = 0;
    
56. }
    
57. void write_addr(uchar addr)//寫地址
    
58. {
    
59. write_cmd(addr|0x80);
    
60. }
    
61. void write_byte(uchar dat)//寫字節(jié)
    
62. {  
    
63. while(lcd_bz());
    
64. rs = 1;
    
65. rw = 0;
    
66. ep = 0;
    
67. P0 = dat;          
    
68. ep = 1;
    
69. ep = 0;
    
70. }
    
71. void lcd_init()// 初始化
    
72. {
    
73. write_cmd(0x38);
    
74. delay(1);
    
75.   write_cmd(0x08);
    
76. delay(1);
    
77. write_cmd(0x01);
    
78. delay(1);
    
79. write_cmd(0x06);
    
80. delay(1);  
    
81. write_cmd(0x0c);
    
82. delay(1);
    
83. }
    
84. void display(uchar addr, uchar q)//在某一地址上顯示一字節(jié)
    
85. {
    
86. delay(10);
    
87. write_addr(addr);
    
88. write_byte(q);
    
89. longdelay(2);
    
90. }
    
91. void start()//開(kāi)始信號(hào)
    
92. {
    
93. io=1;
    
94. delay1();
    
95. io=0;
    
96. delay(20);//>18ms  
    
97. io=1;
    
98. delay1();//20-40us
    
99. delay1();
    
100. delay1();
     
101. delay1();
     
102. delay1();
     
103. }
     
104. uchar receive_byte()//接收一個(gè)字節(jié)
     
105. {
     
106. uchar i,temp,count;
     
107. for(i=0;i<8;i++)
     
108. {
     
109.    count=2;  
     
110.   while((!io)&&count++)//等待50us低電平結(jié)束
     
111.   temp=0;
     
112.   delay1();
     
113.   delay1();
     
114.   delay1();
     
115.   delay1();
     
116.    if(io==1)
     
117.   temp=1;
     
118.   count=2;
     
119.   while((io)&&count++);
     
120.   if(count==1)break;
     
121. data_byte<<=1;
     
122.   data_byte|=temp;
     
123. }
     
124. return data_byte;
     
125. }
     
126. void receive()//接收數(shù)據(jù)
     
127. {
     
128. uchar T_H,T_L,R_H,R_L,check,num_check;
     
129.    uchar count;
     
130. start();//開(kāi)始信號(hào)
     
131. io=1;
     
132. if(!io)//讀取DHT11響應(yīng)信號(hào)
     
133. {
     
134.   count=2;
     
135.   while((!io)&&count++);//DHT11高電平80us是否結(jié)束
     
136.   count=2;
     
137.   while((io)&&count++);
     
138.   R_H=receive_byte();
     
139.   R_L=receive_byte();
     
140.   T_H=receive_byte();
     
141.   T_L=receive_byte();
     
142.   check=receive_byte();
     
143.   io=0;//拉低延時(shí)50us
     
144.   delay1();
     
145.    delay1();
     
146.   delay1();
     
147.   delay1();
     
148.   delay1();
     
149.   io=1;
     
150.   num_check=R_H+R_L+T_H+T_L;
     
151.   if(num_check=check)
     
152.   {
     
153.    RH=R_H;
     
154. RL=R_L;
     
155. TH=T_H;
     
156. TL=T_L;
     
157. check=num_check;
     
158.   }
     
159. }
     
160. }
     
161. void main()
     
162. {
     
163. lcd_init();
     
164. delay(10);
     
165. while(1)
     
166. {
     
167.   receive();
     
168.   delay(100);
     
169.   display(0x00,'R');
     
170.   display(0x01,':');
     
171.   display(0x02,RH/10+0x30);
     
172.    display(0x03,RH%10+0x30);
     
173.   display(0x04,'%');
     
174.   display(0x40,'T');
     
175.   display(0x41,':');                                
     
176.   display(0x42,TH/10+0x30);
     
177.   display(0x43,TH%10+0x30);
     
178. display(0x44,0xdf);
     
179.   display(0x45,0x43);
     
180. }
     
181. }