C51 COMPILER V9.60.0.0 DHT11 02/21/2022 21:12:49 PAGE 1
C51 COMPILER V9.60.0.0, COMPILATION OF MODULE DHT11
OBJECT MODULE PLACED IN .\Objects\dht11.obj
COMPILER INVOKED BY: D:\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 void dht11_Delay32us(void) //@11.0592MHz
5 {
6 1 unsigned char i;
7 1
8 1 i = 12;
9 1 while (--i);
10 1 }
11 void dht11_Delay20ms(void) //@11.0592MHz
12 {
13 1 unsigned char i, j;
14 1
15 1 i = 36;
16 1 j = 217;
17 1 do
18 1 {
19 2 while (--j);
20 2 } while (--i);
21 1 }
22 void dht11_Delay50us(void) //@11.0592MHz
23 {
24 1 unsigned char i;
25 1
26 1 _nop_();
27 1 i = 20;
28 1 while (--i);
29 1 }
30
31
32 unsigned char dht11_read_byte(void)
33 {
34 1 unsigned char r_val = 0;
35 1 unsigned char t_count = 0; //��ʱ������ֹ��ʱ��
36 1 unsigned char i;
37 1
38 1 for(i = 0 ; i < 8 ; i++)
39 1 {
40 2 t_count = 0;
41 2
42 2 //�͵�ƽ50us��ʼһ������λ��ȡ��
43 2 while( !DHT11_PIN )
44 2 {
45 3 _nop_();
46 3 t_count++;
47 3 if(t_count > 250) //��ʱ��
48 3 return 100;
49 3 }
50 2 t_count = 0;
51 2
52 2 dht11_Delay32us(); //32us
53 2
54 2 //�ߵ�ƽ26~28us��ʾ'0',70us��ʾ'1'
C51 COMPILER V9.60.0.0 DHT11 02/21/2022 21:12:49 PAGE 2
55 2 if( DHT11_PIN == 1 )
56 2 {
57 3 r_val <<= 1;
58 3 r_val |= 1;
59 3 }
60 2 else
61 2 {
62 3 r_val <<= 1;
63 3 continue;
64 3 }
65 2
66 2 //�ȴ�DHT11�������������
67 2 while( DHT11_PIN == 1)
68 2 {
69 3 _nop_();
70 3 t_count++;
71 3 if(t_count>250)
72 3 {
73 4 return 100;
74 4 }
75 3 }
76 2 }
77 1 return r_val;
78 1 }
79
80
81 char dht11_value(unsigned char *temp , unsigned char *humi , unsigned char flag)
82 {
83 1 unsigned char t_count = 0; //��ʱ����
84 1 unsigned char h_i = 0 , h_f = 0;
85 1 unsigned char t_i = 0 , t_f = 0;
86 1 unsigned char check_sum = 0;
87 1
88 1 DHT11_PIN_OUT();
89 1 DHT11_PIN_L(); //����͵�ƽ��
90 1
91 1 //�͵�ƽ����ʱ��������18ms;
92 1 dht11_Delay20ms(); //20ms;
93 1
94 1 DHT11_PIN_H(); //���������ź�,�ߵ�ƽ��
95 1
96 1 //�����ȴ�20us~40us����ȡDHT11��Ӧ�����
97 1 dht11_Delay32us();
98 1
99 1 DHT11_PIN_IN();
100 1 if(DHT11_PIN == 0) //��ȷ����Ӧ�����
101 1 {
102 2 while( !DHT11_PIN )
103 2 {
104 3 _nop_();
105 3 t_count++;
106 3
107 3 if(t_count > 250) //��ʱ��
108 3 return -1;
109 3 }
110 2
111 2 t_count = 0;
112 2
113 2 dht11_Delay50us(); //DHT11������Ӧ��������������80us;
114 2 while( DHT11_PIN ); //�ȴ����գ�
115 2 {
116 3 _nop_();
C51 COMPILER V9.60.0.0 DHT11 02/21/2022 21:12:49 PAGE 3
117 3 t_count++;
118 3
119 3 if(t_count > 250) //��ʱ��
120 3 return -1;
121 3 }
122 2 EA=0;
123 2 h_i = dht11_read_byte(); //ʪ���������֣�
124 2 h_f = dht11_read_byte(); //ʪ��С�����֣�
125 2 t_i = dht11_read_byte(); //�¶��������֣�
126 2 t_f = dht11_read_byte(); //�¶�С�����֣�
127 2 check_sum = dht11_read_byte(); //У��ͣ�
128 2 EA=1;
129 2 //У�����ȷ������ʪ���������ֻ�ȡ��ȷ����ʾ��ȡ�ɹ���
130 2 if(check_sum == ( h_i + h_f + t_i + t_f ) || (h_i != 100 && t_i != 100) )
131 2 {
132 3 if(flag == DHT11_STRING)
133 3 {
134 4 temp[0] = t_i/10+0x30;
135 4 temp[1] = t_i%10+0x30;
136 4 humi[0] = h_i/10+0x30;
137 4 humi[1] = h_i%10+0x30;
138 4 }
139 3 else
140 3 {
141 4 if(t_i<=50&&h_i<95)
142 4 {
143 5 *temp = t_i;
144 5 *humi = h_i;
145 5 }
146 4 }
147 3 }
148 2 else
149 2 {
150 3 // if(flag == DHT11_STRING)
151 3 // {
152 3 // temp[0] = '0';
153 3 // temp[1] = '0';
154 3 // humi[0] = '0';
155 3 // humi[1] = '0';
156 3 // }
157 3 // else
158 3 // {
159 3 // *temp = 0;
160 3 // *humi = 0;
161 3 // }
162 3
163 3 return -1;
164 3 }
165 2 }
166 1 else
167 1 {
168 2 // if(flag == DHT11_STRING)
169 2 // {
170 2 // temp[0] = '0';
171 2 // temp[1] = '0';
172 2 // humi[0] = '0';
173 2 // humi[1] = '0';
174 2 // }
175 2 // else
176 2 // {
177 2 // *temp = 0;
178 2 // *humi = 0;
C51 COMPILER V9.60.0.0 DHT11 02/21/2022 21:12:49 PAGE 4
179 2 // }
180 2
181 2 return -1;
182 2 }
183 1 return 0;
184 1 }
185
186
187
188
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 401 ----
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)