📄 ds1820.lst
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C51 COMPILER V8.08 DS1820 08/29/2008 11:02:01 PAGE 1
C51 COMPILER V8.08, COMPILATION OF MODULE DS1820
OBJECT MODULE PLACED IN DS1820.OBJ
COMPILER INVOKED BY: C:\Program Files\Keil\C51\BIN\C51.EXE DS1820.c BROWSE DEBUG OBJECTEXTEND
line level source
1 #include <stdio.h> //头文件
2 #include <reg52.h>
3
4 #define uchar unsigned char //预定义
5 #define FALSE 0
6 #define TRUE 1
7
8 sbit ONEWIRE_DQ = P2^0; //定义P2^0引脚为DS18S20的DQ引脚
9
10 /******************************* 全局变量声明 ********************************/
11 uchar DS18S20ROM[8]; // DS18S20 ROM位
12 uchar ROMFound[5][8]; // DS18S20的ROM 代码表
13 uchar CRCdsc; //用于CRC校验
14
15 /******************************* 子函数声明 ********************************/
16 void Delay(int useconds);
17 uchar Reset(void);
18 void WriteBit(char val);
19 void WriteByte(char val);
20 uchar ReadBit(void);
21 uchar ReadByte(void);
22 void ReadROMNumber(void);
23 uchar CRCCheck( uchar x);
24 uchar SearchDevice(uchar EndFlag, uchar LastData);
25 uchar FindFirstDevice(void);
26 void ReadData(void);
27 void FindDevices(void);
28 void ReadTemperature(void);
29
30 /******************************* 主函数 ********************************/
31 void main(void)
32 {
33 1 uchar MenuOption; //功能选择
34 1 uchar LastData = 0;
35 1 uchar EndFlag = 0;
36 1
37 1 SCON=0x50; //初始化串行口模式1
38 1 TMOD=0x20; //初始化T1为定时功能，模式2
39 1 PCON=0x80; //设置SMOD=1
40 1 TL1=0xF4; //波特率4800bit/s，初值
41 1 TH1=0xF4;
42 1
43 1 TR1 = 1; //启动T1
44 1 TI = 1; //启动发送
45 1
46 1 while(1) //主循环
47 1 {
48 2 printf (" AT89S52 Control 1-Wire DS18S20\n");
49 2 printf("\n*********************************************************\n");
50 2 printf (" Select Control Menu Option\n");
51 2 printf (" 1. Reset All 1-Wire Devices.\n");
52 2 printf (" 2. Read DS18S20 ROM Number.\n");
53 2 printf (" 3. Search DS18S20 ROM.\n");
54 2 printf (" 4. Find All DS18S20 Devices.\n");
55 2 printf (" 5. Read DS18S20 Scratch.\n");
C51 COMPILER V8.08 DS1820 08/29/2008 11:02:01 PAGE 2
56 2 printf (" 6. Read Temperature.\n");
57 2 printf (" 7. Exit Program.\n");
58 2 printf (" Please Input Menu Option:\n");
59 2
60 2 MenuOption = _getkey(); //从键盘输入选择数字
61 2 switch(MenuOption)
62 2 {
63 3 case '1': //复位1-Wire总线
64 3 printf ("\n You Select 1. Reset All 1-Wire Devices .\n");
65 3 printf("\nResetting!......\n");
66 3 Reset(); //复位函数
67 3 printf("\nReset Over!\n");
68 3 break;
69 3 case '2': //读DS18S20 ROM
70 3 printf ("\n You Select 2. Read DS18S20 ROM Number. \n");
71 3 printf("\nReading!......\n");
72 3 ReadROMNumber(); //读取ROM代码函数
73 3 printf("\nRead Over!\n");
74 3 break;
75 3 case '3': //搜索DS18S20
76 3 printf("\n You Select 3. Search DS18S20 ROM \n");
77 3 printf("\nSearching!......\n");
78 3 FindFirstDevice(); //搜索第一个器件
79 3 printf("\nDS18S20 ROM CODE =%02X%02X%02X%02X\n",
80 3 ROMFound[5][7],ROMFound[5][6],ROMFound[5][5],ROMFound[5][4],
81 3 ROMFound[5][3],ROMFound[5][2],ROMFound[5][1],ROMFound[5][0]);
82 3 printf("\nSearch Over!\n");
83 3 break;
84 3 case '4': //搜索所有DS18S20
85 3 printf ("\n You Select 4. Find All DS18S20\n");
86 3 printf("\nFinding!......\n");
87 3 FindDevices(); //查找器件函数
88 3 printf("\nFind Over!\n");
89 3 break;
90 3 case '5': //读取高速暂存器
91 3 printf ("\n You Select 5. Read DS18S20 Scratch \n");
92 3 printf("\nReading!......\n");
93 3 WriteByte(0xCC); //跳过ROM序列号命令（代码为CCH）
94 3 ReadData(); //读取高速暂存器
95 3 printf("\nRead Over!\n");
96 3 break;
97 3 case '6': //读取温度
98 3 printf ("\n You Select 6. Read DS18S20 Temperatur\n");
99 3 printf("\nReading!......\n");
100 3 ReadTemperature(); //读取温度值
101 3 printf("\nRead Over!\n");
102 3 break;
103 3 case '7': //退出程序
104 3 printf ("\n You Select 7. Exit\n");
105 3 goto Exit; //转向Exit标号处
106 3 break;
107 3 default:
108 3 printf ("\n Error: Please Select Right Menu Option\n");
109 3 break;
110 3 };
111 2 }
112 1 Exit: printf("Exit the program!"); //退出
113 1 }
114
115
116
117 void Delay(int useconds)
C51 COMPILER V8.08 DS1820 08/29/2008 11:02:01 PAGE 3
118 {
119 1 int s,t;
120 1 for (s=0; s<useconds;s++) //双重循环
121 1 {
122 2 for(t=0;t<10;t++); //空循环语句实现延时
123 2 }
124 1 }
125
126 uchar Reset(void)
127 {
128 1 uchar PresencePalse;
129 1 ONEWIRE_DQ = 0; //拉低数据线DQ
130 1 Delay(3); //延时
131 1 ONEWIRE_DQ = 1; //置数据线DQ为高电平
132 1 Delay(1); //延时
133 1 PresencePalse = ONEWIRE_DQ; //读取存在信号
134 1 Delay(3); //延时，等待时间隙结束
135 1 if(PresencePalse) //返回存在信号
136 1 return 1;
137 1 else
138 1 return 0;
139 1 }
140
141 void WriteBit(char val)
142 {
143 1 ONEWIRE_DQ = 0; //写时间隙
144 1 if(val==1)
145 1 ONEWIRE_DQ =1; //数据线DQ置1，写1
146 1 else
147 1 ONEWIRE_DQ=0; //数据线DQ置0，写0
148 1 Delay(1); //延时，在时间隙内保持电平值，
149 1 ONEWIRE_DQ = 1; //拉高数据线DQ
150 1 }
151
152 void WriteByte(char val)
153 {
154 1 uchar i;
155 1 uchar temp;
156 1 for (i=0; i<8; i++) //循环写入字节，每次写入一位
157 1 {
158 2 temp = val>>i; //移位
159 2 temp &= 0x01;
160 2 WriteBit(temp); //逐位写
161 2 }
162 1 }
163
164 uchar ReadBit(void)
165 {
166 1 ONEWIRE_DQ = 0; //读时间隙
167 1 ONEWIRE_DQ = 1; //DQ置1
168 1 Delay(1); //延时
169 1 if(ONEWIRE_DQ) //返回数据总线DQ上的位数据
170 1 return 1;
171 1 else
172 1 return 0;
173 1 }
174
175 uchar ReadByte(void)
176 {
177 1 uchar i;
178 1 uchar value = 0;
179 1 for (i=0;i<8;i++) //读取字节，每次读取一位
C51 COMPILER V8.08 DS1820 08/29/2008 11:02:01 PAGE 4
180 1 {
181 2 if(ReadBit())
182 2 value|=0x01<<i; //循环左移
183 2 else
184 2 ; //空语句
185 2 Delay(1);
186 2 }
187 1 return(value); //返回字节数据
188 1 }
189
190 void ReadROMNumber(void)
191 {
192 1 int n;
193 1 char dat[9];
194 1 printf("\nReading DS18S20 ROM Number\n"); //输出信息
195 1 Reset(); //复位子函数
196 1 WriteByte(0x33); //读出ROM序列号命令
197 1 for (n=0;n<8;n++)
198 1 {
199 2 dat[n]=ReadByte(); //循环读ROM序列号
200 2 }
201 1 printf("\nDS18S20 ROMNumber= "); //输出ROM序列号
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