📄 ds18b20.lst
字号:
C51 COMPILER V6.12 DS18B20 05/07/2008 23:22:36 PAGE 1
C51 COMPILER V6.12, COMPILATION OF MODULE DS18B20
OBJECT MODULE PLACED IN .\DS18B20.OBJ
COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE .\DS18B20.C DEBUG OBJECTEXTEND
stmt level source
1 //安装目录下的EXE文件打开后可在电脑上显示当前温度值
2 #include <reg52.h>
3 #define uchar unsigned char
4 #define uint unsigned int
5 sbit DS=P2^2; //define interface
6 uint temp; // variable of temperature
7 uchar flag1; // sign of the result positive or negative
8 sbit dula=P2^6;
9 sbit wela=P2^7;
10 /*unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
11 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
12 unsigned char code table1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,
13 0x87,0xff,0xef};*/
14 unsigned char code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,
15 0xf8,0x80,0x90,0x88,0x83,0xc6,0xa2,0x86,0x8e};
16 unsigned char code table1[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,
17 0x78,0x00,0x10};
18
19
20 void delay(uint count) //delay
21 {
22 1 uint i;
23 1 while(count)
24 1 {
25 2 i=200;
26 2 while(i>0)
27 2 i--;
28 2 count--;
29 2 }
30 1 }
31 ///////功能:串口初始化,波特率9600，方式1///////
32 void Init_Com(void)
33 {
34 1 TMOD = 0x20;
35 1 PCON = 0x00;
36 1 SCON = 0x50;
37 1 TH1 = 0xFd;
38 1 TL1 = 0xFd;
39 1 TR1 = 1;
40 1 }
41
42 void dsreset(void) //send reset and initialization command
43 {
44 1 uint i;
45 1 DS=0;
46 1 i=103;
47 1 while(i>0)i--;
48 1 DS=1;
49 1 i=4;
50 1 while(i>0)i--;
51 1 }
52
53 bit tmpreadbit(void) //read a bit
54 {
55 1 uint i;
C51 COMPILER V6.12 DS18B20 05/07/2008 23:22:36 PAGE 2
56 1 bit dat;
57 1 DS=0;i++; //i++ for delay
58 1 DS=1;i++;i++;
59 1 dat=DS;
60 1 i=8;while(i>0)i--;
61 1 return (dat);
62 1 }
63
64 uchar tmpread(void) //read a byte date
65 {
66 1 uchar i,j,dat;
67 1 dat=0;
68 1 for(i=1;i<=8;i++)
69 1 {
70 2 j=tmpreadbit();
71 2 dat=(j<<7)|(dat>>1); //读出的数据最低位在最前面，这样刚好一个字节在DAT里
72 2 }
73 1 return(dat);
74 1 }
75
76 void tmpwritebyte(uchar dat) //write a byte to ds18b20
77 {
78 1 uint i;
79 1 uchar j;
80 1 bit testb;
81 1 for(j=1;j<=8;j++)
82 1 {
83 2 testb=dat&0x01;
84 2 dat=dat>>1;
85 2 if(testb) //write 1
86 2 {
87 3 DS=0;
88 3 i++;i++;
89 3 DS=1;
90 3 i=8;while(i>0)i--;
91 3 }
92 2 else
93 2 {
94 3 DS=0; //write 0
95 3 i=8;while(i>0)i--;
96 3 DS=1;
97 3 i++;i++;
98 3 }
99 2
100 2 }
101 1 }
102
103 void tmpchange(void) //DS18B20 begin change
104 {
105 1 dsreset();
106 1 delay(1);
107 1 tmpwritebyte(0xcc); // address all drivers on bus
108 1 tmpwritebyte(0x44); // initiates a single temperature conversion
109 1 }
110
111 uint tmp() //get the temperature
112 {
113 1 float tt;
114 1 uchar a,b;
115 1 dsreset();
116 1 delay(1);
117 1 tmpwritebyte(0xcc);
C51 COMPILER V6.12 DS18B20 05/07/2008 23:22:36 PAGE 3
118 1 tmpwritebyte(0xbe);
119 1 a=tmpread();
120 1 b=tmpread();
121 1 temp=b;
122 1 temp<<=8; //two byte compose a int variable
123 1 temp=temp|a;
124 1 tt=temp*0.0625;
125 1 temp=tt*10+0.5;
126 1 return temp;
127 1 }
128
129 void readrom() //read the serial
130 {
131 1 uchar sn1,sn2;
132 1 dsreset();
133 1 delay(1);
134 1 tmpwritebyte(0x33);
135 1 sn1=tmpread();
136 1 sn2=tmpread();
137 1 }
138
139
140 void delay10ms() //delay
141 {
142 1 uchar a,b;
143 1 for(a=10;a>0;a--)
144 1 for(b=60;b>0;b--);
145 1 }
146
147 void display(uint temp) //显示程序
148 {
149 1 uchar A1,A2,A2t,A3,ser;
150 1 ser=temp/10;
151 1 SBUF=ser;
152 1 A1=temp/100;
153 1 A2t=temp%100;
154 1 A2=A2t/10;
155 1 A3=A2t%10;
156 1 dula=0;
157 1 P0=table[A1]; //显示百位
158 1 dula=1;
159 1 dula=0;
160 1
161 1 wela=0;
162 1 //P0=0x7e;
163 1 P0=0x81;
164 1 wela=1;
165 1 wela=0;
166 1 delay(1);
167 1
168 1 dula=0;
169 1 P0=table1[A2]; //显示十位
170 1 dula=1;
171 1 dula=0;
172 1
173 1 wela=0;
174 1 //P0=0x7d;
175 1 P0=0x82;
176 1 wela=1;
177 1 wela=0;
178 1 delay(1);
179 1
C51 COMPILER V6.12 DS18B20 05/07/2008 23:22:36 PAGE 4
180 1 P0=table[A3]; //显示个位
181 1 dula=1;
182 1 dula=0;
183 1
184 1 //P0=0x7b;
185 1 P0=0x84;
186 1 wela=1;
187 1 wela=0;
188 1 delay(1);
189 1 }
190
191
192 void main()
193 {
194 1 uchar a;
195 1 Init_Com();
196 1 do
197 1 {
198 2 tmpchange();
199 2 // delay(200);
200 2 for(a=10;a>0;a--)
201 2 { display(tmp());
202 3 }
203 2 } while(1);
204 1 }
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 515 ----
CONSTANT SIZE = 26 ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = 3 8
IDATA SIZE = ---- ----
BIT SIZE = ---- 2
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -