C51 COMPILER V9.54 DHT11 02/17/2022 16:20:58 PAGE 1
C51 COMPILER V9.54, COMPILATION OF MODULE DHT11
OBJECT MODULE PLACED IN .\Objects\dht11.obj
COMPILER INVOKED BY: C:\Keil_v5\C51\BIN\C51.EXE dht11.c OPTIMIZE(8,SPEED) BROWSE DEBUG OBJECTEXTEND PRINT(.\Listings\dht
-11.lst) TABS(2) OBJECT(.\Objects\dht11.obj)
line level source
1 #include "dht11.h"
2
3
4
5 void dht11_Delay32us(void) //@11.0592MHz
6 {
7 1 unsigned char i;
8 1
9 1 i = 12;
10 1 while (--i);
11 1 }
12 void dht11_Delay20ms(void) //@11.0592MHz
13 {
14 1 unsigned char i, j;
15 1
16 1 i = 36;
17 1 j = 217;
18 1 do
19 1 {
20 2 while (--j);
21 2 } while (--i);
22 1 }
23 void dht11_Delay50us(void) //@11.0592MHz
24 {
25 1 unsigned char i;
26 1
27 1 _nop_();
28 1 i = 20;
29 1 while (--i);
30 1 }
31
32
33 unsigned char dht11_read_byte(void)
34 {
35 1 unsigned char r_val = 0;
36 1 unsigned char t_count = 0; //��ʱ������ֹ��ʱ��
37 1 unsigned char i;
38 1
39 1 for(i = 0 ; i < 8 ; i++)
40 1 {
41 2 t_count = 0;
42 2
43 2 //�͵�ƽ50us��ʼһ������λ��ȡ��
44 2 while( !DHT11_PIN )
45 2 {
46 3 _nop_();
47 3 t_count++;
48 3 if(t_count > 250) //��ʱ��
49 3 return 100;
50 3 }
51 2 t_count = 0;
52 2
53 2 dht11_Delay32us(); //32us
54 2
C51 COMPILER V9.54 DHT11 02/17/2022 16:20:58 PAGE 2
55 2 //�ߵ�ƽ26~28us��ʾ'0',70us��ʾ'1'
56 2 if( DHT11_PIN == 1 )
57 2 {
58 3 r_val <<= 1;
59 3 r_val |= 1;
60 3 }
61 2 else
62 2 {
63 3 r_val <<= 1;
64 3 continue;
65 3 }
66 2
67 2 //�ȴ�DHT11�������������
68 2 while( DHT11_PIN == 1)
69 2 {
70 3 _nop_();
71 3 t_count++;
72 3 if(t_count>250)
73 3 {
74 4 return 100;
75 4 }
76 3 }
77 2 }
78 1 return r_val;
79 1 }
80
81
82 char dht11_value(unsigned char *temp , unsigned char *humi , unsigned char flag)
83 {
84 1 unsigned char t_count = 0; //��ʱ����
85 1 unsigned char h_i = 0 , h_f = 0;
86 1 unsigned char t_i = 0 , t_f = 0;
87 1 unsigned char check_sum = 0;
88 1
89 1 DHT11_PIN_OUT();
90 1 DHT11_PIN_L(); //����͵�ƽ��
91 1
92 1 //�͵�ƽ����ʱ��������18ms;
93 1 dht11_Delay20ms(); //20ms;
94 1
95 1 DHT11_PIN_H(); //���������ź�,�ߵ�ƽ��
96 1
97 1 //�����ȴ�20us~40us����ȡDHT11��Ӧ�����
98 1 dht11_Delay32us();
99 1
100 1 DHT11_PIN_IN();
101 1 if(DHT11_PIN == 0) //��ȷ����Ӧ�����
102 1 {
103 2 while( !DHT11_PIN )
104 2 {
105 3 _nop_();
106 3 t_count++;
107 3
108 3 if(t_count > 250) //��ʱ��
109 3 return -1;
110 3 }
111 2
112 2 t_count = 0;
113 2
114 2 dht11_Delay50us(); //DHT11������Ӧ��������������80us;
115 2 while( DHT11_PIN ); //�ȴ����գ�
116 2 {
C51 COMPILER V9.54 DHT11 02/17/2022 16:20:58 PAGE 3
117 3 _nop_();
118 3 t_count++;
119 3
120 3 if(t_count > 250) //��ʱ��
121 3 return -1;
122 3 }
123 2 EA=0;
124 2 h_i = dht11_read_byte(); //ʪ���������֣�
125 2 h_f = dht11_read_byte(); //ʪ��С�����֣�
126 2 t_i = dht11_read_byte(); //�¶��������֣�
127 2 t_f = dht11_read_byte(); //�¶�С�����֣�
128 2 check_sum = dht11_read_byte(); //У��ͣ�
129 2 EA=1;
130 2 //У�����ȷ������ʪ���������ֻ�ȡ��ȷ����ʾ��ȡ�ɹ���
131 2 if(check_sum == ( h_i + h_f + t_i + t_f ) || (h_i != 100 && t_i != 100) )
132 2 {
133 3 if(flag == DHT11_STRING)
134 3 {
135 4 temp[0] = t_i/10+0x30;
136 4 temp[1] = t_i%10+0x30;
137 4 humi[0] = h_i/10+0x30;
138 4 humi[1] = h_i%10+0x30;
139 4 }
140 3 else
141 3 {
142 4 if(t_i<=50&&h_i<95)
143 4 {
144 5 *temp = t_i;
145 5 *humi = h_i;
146 5 }
147 4 }
148 3 }
149 2 else
150 2 {
151 3 // if(flag == DHT11_STRING)
152 3 // {
153 3 // temp[0] = '0';
154 3 // temp[1] = '0';
155 3 // humi[0] = '0';
156 3 // humi[1] = '0';
157 3 // }
158 3 // else
159 3 // {
160 3 // *temp = 0;
161 3 // *humi = 0;
162 3 // }
163 3
164 3 return -1;
165 3 }
166 2 }
167 1 else
168 1 {
169 2 // if(flag == DHT11_STRING)
170 2 // {
171 2 // temp[0] = '0';
172 2 // temp[1] = '0';
173 2 // humi[0] = '0';
174 2 // humi[1] = '0';
175 2 // }
176 2 // else
177 2 // {
178 2 // *temp = 0;
C51 COMPILER V9.54 DHT11 02/17/2022 16:20:58 PAGE 4
179 2 // *humi = 0;
180 2 // }
181 2
182 2 return -1;
183 2 }
184 1 return 0;
185 1 }
186
187
188
189
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 367 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = ---- 9
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)