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DHT11.LST
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C51 COMPILER V9.01 DHT11 03/18/2018 20:40:03 PAGE 1
C51 COMPILER V9.01, COMPILATION OF MODULE DHT11
OBJECT MODULE PLACED IN DHT11.OBJ
COMPILER INVOKED BY: C:\Program Files (x86)\Keil\C51\BIN\C51.EXE DHT11.c BROWSE DEBUG OBJECTEXTEND
line level source
1 #include "DHT11.h"
2
3 //定义变量
4 unsigned char HUMI_Buffer_Int = 0;
5 unsigned char TEM_Buffer_Int = 0;
6
7
8 //****************************************************
9 //MS延时函数(12M晶振下测试)
10 //****************************************************
11 static void Delay1ms() //@11.0592MHz
12 {
13 1 unsigned char i, j;
14 1
15 1 _nop_();
16 1 i = 11;
17 1 j = 190;
18 1 do
19 1 {
20 2 while (--j);
21 2 } while (--i);
22 1 }
23
24 void DHT11_delay_ms(unsigned int n)
25 {
26 1 unsigned int i;
27 1 for(i=0;i<n;i++)
28 1 {
29 2 Delay1ms();
30 2 }
31 1 }
32 //****************************************************
33 //延时函数
34 //****************************************************
35 static void Delay10us() //@11.0592MHz
36 {
37 1 unsigned char i;
38 1
39 1 _nop_();
40 1 _nop_();
41 1 _nop_();
42 1 i = 24;
43 1 while (--i);
44 1 }
45 void DHT11_Delay( unsigned int n )
46 {
47 1 unsigned int i;
48 1 for(i = 0 ; i < n ; i++ )
49 1 Delay10us();
50 1 }
51
52 //****************************************************
53 //初始化DHT11
54 //****************************************************
55 bit DHT11_Init()
C51 COMPILER V9.01 DHT11 03/18/2018 20:40:03 PAGE 2
56 {
57 1 bit Flag_DHT11 = 1;
58 1 DHT11_DQ = 0;
59 1 DHT11_delay_ms(25); //延时>18ms
60 1
61 1 DHT11_DQ = 1;
62 1 DHT11_Delay(3); //延时20~40us
63 1
64 1 Flag_DHT11 = DHT11_DQ;
65 1 DHT11_Delay(3); //DHT11响应总时间80us
66 1
67 1 DHT11_Delay(4); //DHT11拉高信号80us
68 1
69 1 return Flag_DHT11;
70 1 }
71
72 //****************************************************
73 //读一个字节DHT11数据
74 //****************************************************
75 unsigned char DHT11_Read_Byte()
76 {
77 1 unsigned char i,dat,j;
78 1 while( DHT11_DQ == 1 );
79 1 for( i = 0 ; i < 8 ; i++ )
80 1 {
81 2 while( DHT11_DQ == 0 );
82 2 dat <<= 1;
83 2 for( j = 0 ; DHT11_DQ == 1 ; j++);
84 2 if( j < 30 )
85 2 dat &= 0xfe; //低位清零
86 2 else
87 2 dat |= 0x01; //低位置一
88 2 }
89 1 return dat;
90 1 }
91
92 //****************************************************
93 //读取温湿度值，存放在TEM_Buffer和HUMI_Buffer
94 //****************************************************
95 void DHT11_Read()
96 {
97 1 if( DHT11_Init() == 0 )
98 1 {
99 2 HUMI_Buffer_Int = DHT11_Read_Byte(); //读取湿度的整数值
100 2 DHT11_Read_Byte(); //读取湿度的小数值
101 2 TEM_Buffer_Int = DHT11_Read_Byte(); //读取温度的整数值
102 2 DHT11_Read_Byte(); //读取温度的小数值
103 2 DHT11_Read_Byte(); //读取校验和
104 2 DHT11_Delay(5); //DHT11拉低总线50us
105 2
106 2 DHT11_DQ = 1; //释放总线
107 2 }
108 1 }
109
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MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 178 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
C51 COMPILER V9.01 DHT11 03/18/2018 20:40:03 PAGE 3
PDATA SIZE = ---- ----
DATA SIZE = 2 ----
IDATA SIZE = ---- ----
BIT SIZE = ---- 1
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)