wl007.lst
来自「单片机开发资料 基于51单片机的单片机开发板 包括《实验例程」· LST 代码 · 共 210 行
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C51 COMPILER V7.08 WL007 11/03/2004 11:07:41 PAGE 1
C51 COMPILER V7.08, COMPILATION OF MODULE WL007
OBJECT MODULE PLACED IN wl007.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE wl007.C BROWSE DEBUG OBJECTEXTEND
line level source
1 /*******************************************************************************
2 * *
3 * File : wl007.c *
4 * Date : 2004-11-5 *
5 * Version : 1.0 *
6 * *
7 ********************************************************************************
8 * Descriptoon: *
9 * 读写AT24C01演示程序 *
10 * *
11 * *
12 * *
13 *******************************************************************************/
14 #include <reg51.h>
15 #include <intrins.h>
16
17 #define OP_READ 0xa1 // 器件地址以及读取操作
18 #define OP_WRITE 0xa0 // 器件地址以及写入操作
19 #define MAX_ADDR 0x7f // AT24C01最大地址
20
21 unsigned char code dis_code[] = {0x7e,0xbd,0xdb,0xe7,0xdb,0xbd,0x7e,0xff};
22 // 写入到AT24C01的数据串
23
24 sbit SDA = P1^1;
25 sbit SCL = P1^0;
26
27
28 void start();
29 void stop();
30 unsigned char shin();
31 bit shout(unsigned char write_data);
32 unsigned char read_random(unsigned char random_addr);
33 void write_byte( unsigned char addr, unsigned char write_data);
34 void fill_byte(unsigned char fill_data);
35 void delayms(unsigned char ms);
36
37 main(void)
38 {
39 1 unsigned char i;
40 1 SDA = 1;
41 1 SCL = 1;
42 1 fill_byte(0xff); // 全部填充0xff
43 1
44 1 for(i = 0 ; i < 8; i++) //写入显示代码到AT24Cxx
45 1 {
46 2 write_byte(i, dis_code[i]);
47 2 }
48 1
49 1 i = 0;
50 1 while(1)
51 1 {
52 2
53 2 P0 = read_random(i); // 循环读取24Cxx内容，并输出到P0口
54 2 i++;
55 2 i &= 0x07; // 循环读取范围为0x00～0x07
C51 COMPILER V7.08 WL007 11/03/2004 11:07:41 PAGE 2
56 2 delayms(250);
57 2 }
58 1 }
59
60 void start()
61 // 开始位
62 {
63 1 SDA = 1;
64 1 SCL = 1;
65 1 _nop_();
66 1 _nop_();
67 1 SDA = 0;
68 1 _nop_();
69 1 _nop_();
70 1 _nop_();
71 1 _nop_();
72 1 SCL = 0;
73 1 }
74
75 void stop()
76 // 停止位
77 {
78 1 SDA = 0;
79 1 _nop_();
80 1 _nop_();
81 1 SCL = 1;
82 1 _nop_();
83 1 _nop_();
84 1 _nop_();
85 1 _nop_();
86 1 SDA = 1;
87 1 }
88
89 unsigned char shin()
90 // 从AT24Cxx移入数据到MCU
91 {
92 1 unsigned char i,read_data;
93 1 for(i = 0; i < 8; i++)
94 1 {
95 2 SCL = 1;
96 2 read_data <<= 1;
97 2 read_data |= (unsigned char)SDA;
98 2 SCL = 0;
99 2 }
100 1 return(read_data);
101 1 }
102 bit shout(unsigned char write_data)
103 // 从MCU移出数据到AT24Cxx
104 {
105 1 unsigned char i;
106 1 bit ack_bit;
107 1 for(i = 0; i < 8; i++) // 循环移入8个位
108 1 {
109 2 SDA = (bit)(write_data & 0x80);
110 2 _nop_();
111 2 SCL = 1;
112 2 _nop_();
113 2 _nop_();
114 2 SCL = 0;
115 2 write_data <<= 1;
116 2 }
117 1 SDA = 1; // 读取应答
C51 COMPILER V7.08 WL007 11/03/2004 11:07:41 PAGE 3
118 1 _nop_();
119 1 _nop_();
120 1 SCL = 1;
121 1 _nop_();
122 1 _nop_();
123 1 _nop_();
124 1 _nop_();
125 1 ack_bit = SDA;
126 1 SCL = 0;
127 1 return ack_bit; // 返回AT24Cxx应答位
128 1 }
129
130 void write_byte(unsigned char addr, unsigned char write_data)
131 // 在指定地址addr处写入数据write_data
132 {
133 1 start();
134 1 shout(OP_WRITE);
135 1 shout(addr);
136 1 shout(write_data);
137 1 stop();
138 1 delayms(10); // 写入周期
139 1 }
140
141 void fill_byte(unsigned char fill_data)
142 // 填充数据fill_data到EEPROM内
143 {
144 1 unsigned char i;
145 1 for(i = 0; i < MAX_ADDR; i++)
146 1 {
147 2 write_byte(i, fill_data);
148 2 }
149 1
150 1 }
151
152 unsigned char read_current()
153 // 在当前地址读取
154 {
155 1 unsigned char read_data;
156 1 start();
157 1 shout(OP_READ);
158 1 read_data = shin();
159 1 stop();
160 1 return read_data;
161 1 }
162
163 unsigned char read_random(unsigned char random_addr)
164 // 在指定地址读取
165 {
166 1 start();
167 1 shout(OP_WRITE);
168 1 shout(random_addr);
169 1 return(read_current());
170 1 }
171
172 void delayms(unsigned char ms)
173 // 延时子程序
174 {
175 1 unsigned char i;
176 1 while(ms--)
177 1 {
178 2 for(i = 0; i < 120; i++);
179 2 }
C51 COMPILER V7.08 WL007 11/03/2004 11:07:41 PAGE 4
180 1 }
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 246 ----
CONSTANT SIZE = 8 ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = ---- 3
IDATA SIZE = ---- ----
BIT SIZE = ---- 1
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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