wl007.lst
来自「周立功的51单片机试验例程,我当年就是靠这个学会单片机的」· LST 代码 · 共 213 行
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C51 COMPILER V7.08 WL007 02/23/2006 16:50:30 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 : 2004-1-5 *
5 * Version : 1.0 *
6 * *
7 * Author : Freeman freeman@willar.com *
8 * Company : Willar www.willar.com *
9 * *
10 ********************************************************************************
11 * Descriptoon: *
12 * 读写AT24C01演示程序 *
13 * *
14 * *
15 * *
16 *******************************************************************************/
17 #include <reg51.h>
18 #include <intrins.h>
19
20 #define OP_READ 0xa1 // 器件地址以及读取操作
21 #define OP_WRITE 0xa0 // 器件地址以及写入操作
22 #define MAX_ADDR 0x7f // AT24C01最大地址
23
24 unsigned char code dis_code[] = {0x7e,0xbd,0xdb,0xe7,0xdb,0xbd,0x7e,0xff};
25 // 写入到AT24C01的数据串
26
27 sbit SDA = P1^1;
28 sbit SCL = P1^0;
29
30
31 void start();
32 void stop();
33 unsigned char shin();
34 bit shout(unsigned char write_data);
35 unsigned char read_random(unsigned char random_addr);
36 void write_byte( unsigned char addr, unsigned char write_data);
37 void fill_byte(unsigned char fill_data);
38 void delayms(unsigned char ms);
39
40 main(void)
41 {
42 1 unsigned char i;
43 1 SDA = 1;
44 1 SCL = 1;
45 1 fill_byte(0xff); // 全部填充0xff
46 1
47 1 for(i = 0 ; i < 8; i++) //写入显示代码到AT24Cxx
48 1 {
49 2 write_byte(i, dis_code[i]);
50 2 }
51 1
52 1 i = 0;
53 1 while(1)
54 1 {
55 2
C51 COMPILER V7.08 WL007 02/23/2006 16:50:30 PAGE 2
56 2 P0 = read_random(i); // 循环读取24Cxx内容，并输出到P0口
57 2 i++;
58 2 i &= 0x07; // 循环读取范围为0x00～0x07
59 2 delayms(250);
60 2 }
61 1 }
62
63 void start()
64 // 开始位
65 {
66 1 SDA = 1;
67 1 SCL = 1;
68 1 _nop_();
69 1 _nop_();
70 1 SDA = 0;
71 1 _nop_();
72 1 _nop_();
73 1 _nop_();
74 1 _nop_();
75 1 SCL = 0;
76 1 }
77
78 void stop()
79 // 停止位
80 {
81 1 SDA = 0;
82 1 _nop_();
83 1 _nop_();
84 1 SCL = 1;
85 1 _nop_();
86 1 _nop_();
87 1 _nop_();
88 1 _nop_();
89 1 SDA = 1;
90 1 }
91
92 unsigned char shin()
93 // 从AT24Cxx移入数据到MCU
94 {
95 1 unsigned char i,read_data;
96 1 for(i = 0; i < 8; i++)
97 1 {
98 2 SCL = 1;
99 2 read_data <<= 1;
100 2 read_data |= (unsigned char)SDA;
101 2 SCL = 0;
102 2 }
103 1 return(read_data);
104 1 }
105 bit shout(unsigned char write_data)
106 // 从MCU移出数据到AT24Cxx
107 {
108 1 unsigned char i;
109 1 bit ack_bit;
110 1 for(i = 0; i < 8; i++) // 循环移入8个位
111 1 {
112 2 SDA = (bit)(write_data & 0x80);
113 2 _nop_();
114 2 SCL = 1;
115 2 _nop_();
116 2 _nop_();
117 2 SCL = 0;
C51 COMPILER V7.08 WL007 02/23/2006 16:50:30 PAGE 3
118 2 write_data <<= 1;
119 2 }
120 1 SDA = 1; // 读取应答
121 1 _nop_();
122 1 _nop_();
123 1 SCL = 1;
124 1 _nop_();
125 1 _nop_();
126 1 _nop_();
127 1 _nop_();
128 1 ack_bit = SDA;
129 1 SCL = 0;
130 1 return ack_bit; // 返回AT24Cxx应答位
131 1 }
132
133 void write_byte(unsigned char addr, unsigned char write_data)
134 // 在指定地址addr处写入数据write_data
135 {
136 1 start();
137 1 shout(OP_WRITE);
138 1 shout(addr);
139 1 shout(write_data);
140 1 stop();
141 1 delayms(10); // 写入周期
142 1 }
143
144 void fill_byte(unsigned char fill_data)
145 // 填充数据fill_data到EEPROM内
146 {
147 1 unsigned char i;
148 1 for(i = 0; i < MAX_ADDR; i++)
149 1 {
150 2 write_byte(i, fill_data);
151 2 }
152 1
153 1 }
154
155 unsigned char read_current()
156 // 在当前地址读取
157 {
158 1 unsigned char read_data;
159 1 start();
160 1 shout(OP_READ);
161 1 read_data = shin();
162 1 stop();
163 1 return read_data;
164 1 }
165
166 unsigned char read_random(unsigned char random_addr)
167 // 在指定地址读取
168 {
169 1 start();
170 1 shout(OP_WRITE);
171 1 shout(random_addr);
172 1 return(read_current());
173 1 }
174
175 void delayms(unsigned char ms)
176 // 延时子程序
177 {
178 1 unsigned char i;
179 1 while(ms--)
C51 COMPILER V7.08 WL007 02/23/2006 16:50:30 PAGE 4
180 1 {
181 2 for(i = 0; i < 120; i++);
182 2 }
183 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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