E2PROM 24c02测试程序源代码

数码管显示部分的原理图：http://www.51hei.com/f/51hei-5.pdf

源代码如下：

1. 
   
2. #include<reg51.h>
   
3. #define uchar unsigned char
   
4. #define uint unsigned int
   
5. bit write=0;
   
6. sbit sda=P2^0;
   
7. sbit scl=P2^1;
   
8. sbit  wela=P2^7;
   
9. sbit  dula=P2^6;
   
10. uchar sec,tcnt;
    
11. uchar smg_change[6]={10,10,10,10,10,10};
    
12. unsigned char code duanma[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00};
    
13. unsigned char code weima[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf};
    
14. void delay()
    
15. {;;}
    
16. void delay1ms(uchar t)
    
17. {
    
18. uchar i,j;
    
19. for(i=t;i>0;i--)
    
20.    for(j=110;j>0;j--);
    
21. }
    
22. void init()
    
23. {
    
24. sda=1;
    
25. delay();
    
26. scl=1;
    
27. delay();
    
28. }
    
29. void start()
    
30. {
    
31. sda=1;
    
32. delay();
    
33. scl=1;
    
34. delay();
    
35. sda=0;
    
36. delay();
    
37. scl=0;
    
38. }
    
39. void stop()
    
40. {
    
41. sda=0;
    
42. delay();
    
43. scl=1;
    
44. delay();
    
45. sda=1;
    
46. delay();
    
47. scl=0;
    
48. }
    
49. void respons()
    
50. {
    
51. uchar i;
    
52. sda=1;
    
53. scl=1;
    
54. delay();
    
55. while((sda==1)&&(i<250))
    
56. i++;
    
57. scl=0;
    
58. delay();
    
59. }
    
60. void no_ack()
    
61. {
    
62. sda=1;
    
63. scl=1;
    
64. scl=0;
    
65. }
    
66. void write_byte(uchar date)
    
67. {
    
68. uchar i;
    
69. for(i=0;i<8;i++)
    
70. {
    
71.   date=date<<1;
    
72.   scl=0;
    
73.   delay();
    
74.   sda=CY;
    
75.   delay();
    
76.   scl=1;
    
77.   delay();
    
78. }
    
79.      scl=0;
    
80. }
    
81. uchar read_byte()
    
82. {
    
83. uchar i,k;
    
84.   for(i=0;i<8;i++)
    
85.   {
    
86.    k<<=1;
    
87.    scl=1;
    
88.    delay();
    
89.    sda=1;
    
90.    if(sda)
    
91.    k|=0x01;
    
92.    scl=0;
    
93.    delay();
    
94.   }
    
95.   return k;
    
96. }
    
97. void write_add(uchar address,uchar date)
    
98. {
    
99.   start();
    
100.   write_byte(0xa0);
     
101.   respons();
     
102.   write_byte(address);
     
103.   respons();
     
104.   write_byte(date);
     
105.   respons();
     
106.   stop();
     
107. }
     
108. uchar read_add(uchar address)
     
109. {   
     
110.   uchar date;
     
111.   start();
     
112.   write_byte(0xa0);
     
113.   respons();
     
114.   write_byte(address);
     
115.   respons();
     
116.   start();
     
117.   write_byte(0xa1);
     
118.   respons();
     
119.   date=read_byte();
     
120.   no_ack();
     
121.   stop();
     
122.   return date;
     
123. }
     
124. void display(uchar bai,uchar shi)
     
125. {
     
126. dula=0;
     
127. P0=duanma[bai];
     
128. dula=1;
     
129. dula=0;
     
130. wela=0;
     
131. P0=weima[0];
     
132. wela=1;
     
133. wela=0;
     
134. delay1ms(5);
     
135. dula=0;
     
136. P0=duanma[shi];
     
137. dula=1;
     
138. dula=0;
     
139. wela=0;
     
140. P0=weima[1];
     
141. wela=1;
     
142. wela=0;
     
143. delay1ms(5);
     
144. 
     
145. }
     
146. void init_time()
     
147. {
     
148. TMOD=0x01;
     
149. TH0=(65536-50000)/256;
     
150. TL0=(65536-50000)%256;
     
151. ET0=1;
     
152. TR0=1;
     
153. EA=1;
     
154. }
     
155. void main()
     
156. {
     
157. init();
     
158. init_time();
     
159. sec=read_add(0);
     
160. if(sec>60)
     
161. sec=sec-250;
     
162. while(1)
     
163. {
     
164.         display(sec/10,sec%10);
     
165. ET0=0;
     
166. write_add(0,sec);
     
167. ET0=1;
     
168. }
     
169. }
     
170. void timer0() interrupt 1
     
171. {
     
172. TH0=(65536-50000)/256;
     
173. TL0=(65536-50000)%256;
     
174. tcnt++;
     
175. if(tcnt==20)
     
176. {
     
177.   tcnt=0;
     
178.   sec++;
     
179.   write=1;
     
180.   if(sec==60)
     
181.   sec=0;
     
182. }
     
183. }
     

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