📄 18b20.lst
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C51 COMPILER V8.02 18B20 06/29/2010 15:07:35 PAGE 1
C51 COMPILER V8.02, COMPILATION OF MODULE 18B20
OBJECT MODULE PLACED IN 18b20.OBJ
COMPILER INVOKED BY: D:\处理软件\keil\C51\BIN\C51.EXE 18b20.c BROWSE DEBUG OBJECTEXTEND
line level source
1 /*****************************************************************************
2 “天祥电子” 倾情奉献
3 www.txmcu.cn
4 www.txmcu.com
5 *******************************************************************************
6 程序功能：实时采集当前环境温度值，并显示于数码管上。
7 *****************************************************************************/
8 #include <reg52.h>
9 #define uchar unsigned char
10 #define uint unsigned int
11 sbit DS=P2^2; //define interface
12 uint temp; // variable of temperature
13 uchar flag1; // sign of the result positive or negative
14 sbit dula=P2^6;
15 sbit wela=P2^7;
16 unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
17 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
18 unsigned char code table1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,
19 0x87,0xff,0xef};
20
21 void delay(uint count) //delay
22 {
23 1 uint i;
24 1 while(count)
25 1 {
26 2 i=200;
27 2 while(i>0)
28 2 i--;
29 2 count--;
30 2 }
31 1 }
32 void dsreset(void) //send reset and initialization command
33 {
34 1 uint i;
35 1 DS=0;
36 1 i=103;
37 1 while(i>0)i--;
38 1 DS=1;
39 1 i=4;
40 1 while(i>0)i--;
41 1 }
42
43 bit tmpreadbit(void) //read a bit
44 {
45 1 uint i;
46 1 bit dat;
47 1 DS=0;i++; //i++ for delay
48 1 DS=1;i++;i++;
49 1 dat=DS;
50 1 i=8;while(i>0)i--;
51 1 return (dat);
52 1 }
53
54 uchar tmpread(void) //read a byte date
55 {
C51 COMPILER V8.02 18B20 06/29/2010 15:07:35 PAGE 2
56 1 uchar i,j,dat;
57 1 dat=0;
58 1 for(i=1;i<=8;i++)
59 1 {
60 2 j=tmpreadbit();
61 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
62 2 }
63 1 return(dat);
64 1 }
65
66 void tmpwritebyte(uchar dat) //write a byte to ds18b20
67 {
68 1 uint i;
69 1 uchar j;
70 1 bit testb;
71 1 for(j=1;j<=8;j++)
72 1 {
73 2 testb=dat&0x01;
74 2 dat=dat>>1;
75 2 if(testb) //write 1
76 2 {
77 3 DS=0;
78 3 i++;i++;
79 3 DS=1;
80 3 i=8;while(i>0)i--;
81 3 }
82 2 else
83 2 {
84 3 DS=0; //write 0
85 3 i=8;while(i>0)i--;
86 3 DS=1;
87 3 i++;i++;
88 3 }
89 2
90 2 }
91 1 }
92
93 void tmpchange(void) //DS18B20 begin change
94 {
95 1 dsreset();
96 1 delay(1);
97 1 tmpwritebyte(0xcc); // address all drivers on bus
98 1 tmpwritebyte(0x44); // initiates a single temperature conversion
99 1 }
100
101 uint tmp() //get the temperature
102 {
103 1 float tt;
104 1 uchar a,b;
105 1 dsreset();
106 1 delay(1);
107 1 tmpwritebyte(0xcc);
108 1 tmpwritebyte(0xbe);
109 1 a=tmpread();
110 1 b=tmpread();
111 1 temp=b;
112 1 temp<<=8; //two byte compose a int variable
113 1 temp=temp|a;
114 1 tt=temp*0.0625;
115 1 temp=tt*10+0.5;
116 1 return temp;
117 1 }
C51 COMPILER V8.02 18B20 06/29/2010 15:07:35 PAGE 3
118
119 void display(uint temp) //显示程序
120 {
121 1 uchar A1,A2,A2t,A3;
122 1 A1=temp/100;
123 1 A2t=temp%100;
124 1 A2=A2t/10;
125 1 A3=A2t%10;
126 1 dula=0;
127 1 P0=table[A1]; //显示百位
128 1 dula=1;
129 1 dula=0;
130 1
131 1 wela=0;
132 1 P0=0x7e;
133 1 wela=1;
134 1 wela=0;
135 1 delay(1);
136 1
137 1 dula=0;
138 1 P0=table1[A2]; //显示十位
139 1 dula=1;
140 1 dula=0;
141 1
142 1 wela=0;
143 1 P0=0x7d;
144 1 wela=1;
145 1 wela=0;
146 1 delay(1);
147 1
148 1 P0=table[A3]; //显示个位
149 1 dula=1;
150 1 dula=0;
151 1
152 1 P0=0x7b;
153 1 wela=1;
154 1 wela=0;
155 1 delay(1);
156 1 }
157
158
159 void main()
160 {
161 1 uchar a;
162 1 do
163 1 {
164 2 tmpchange();
165 2 for(a=10;a>0;a--)
166 2 {
167 3 display(tmp());
168 3 }
169 2 } while(1);
170 1 }
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 453 ----
CONSTANT SIZE = 26 ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = 3 6
IDATA SIZE = ---- ----
C51 COMPILER V8.02 18B20 06/29/2010 15:07:35 PAGE 4
BIT SIZE = ---- 2
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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