標題: EEPROM AT24CO2讀寫操作 [打印本頁]
作者: liuda    時間: 2015-1-21 21:44
標題: EEPROM AT24CO2讀寫操作
時間過的真快轉(zhuǎn)眼天氣冷了,這讓懶惰的我都來不及適應,最近是東一下西一下的 把  IIC總線接口的EEPROM 勉強學會點,留下點痕跡留著以后品味當時的心情吧!



  1. # include  <reg52.h>
  2. # define uchar unsigned char            //宏定義
  3. # define uint unsigned int
  4. uchar shi,ge,dd,ff,write;        //定義局變量
  5. sbit sda=P2^1;        //聲明P2口
  6. sbit scl=P2^0;        //聲明P2口
  7. sbit duan=P2^6;
  8. sbit wei=P2^7;
  9. uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,
  10. 0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}        ;        //LED數(shù)組顯示
  11. void delay() //微秒級延時
  12. { ; ;}
  13. void delayms(uchar a)  //毫秒延時
  14. {
  15. uchar x,y;
  16. for(x=a;x>0;x--)
  17.    for(y=0;y<110;y++);
  18. }
  19. void init()          //AT24C02初始化
  20. {
  21. sda=1;
  22. delay();
  23. scl=1;
  24. delay();
  25. }
  26. void start()   //AT24C02啟動信號
  27. {
  28. sda=1;
  29. delay();
  30. scl=1;
  31. delay();
  32. sda=0;
  33. delay();
  34. }
  35. void stop()         //AT24C02停止信號
  36. {
  37. sda=0;
  38. delay();
  39. scl=1;
  40. delay();
  41. sda=1;
  42. delay();
  43. }
  44. void respons()         //AT24C02應答
  45. {
  46.    uchar i;
  47.    scl=1;
  48.    delay();
  49.    while((sda==1)&&(i<255))i++;
  50.    scl=0;
  51.    delay();

  53. }
  54. void write_byte(uchar a)   //AT24C02寫一個字節(jié)
  55. {
  56. uchar i,j;
  57. j=a;
  58. for(i=0;i<8;i++)
  59. {
  60. scl=0;
  61. delay();
  62. j=j<<1;
  63. sda=CY;
  64. scl=1;
  65. delay();
  66. }
  67. scl=0;
  68. delay();
  69. sda=1;
  70. delay();
  71. }
  72. uchar read_byte()  //AT24C02讀一個字節(jié)
  73. {
  74. uchar i,j;
  75. for(i=0;i<8;i++)
  76. {
  77. scl=0;
  78. delay();
  79. sda=1;
  80. delay();
  81. scl=1;
  82. j=(j<<1)|sda;
  83. delay();
  84. }
  85. return j;  

  87. }  
  88. void add_write(uchar address,uchar date) //AT240C2任意地址寫一個字節(jié)數(shù)據(jù)
  89. {
  90. start();
  91. write_byte(0xae);
  92. respons();
  93. write_byte(address);
  94. respons();
  95. write_byte(date);
  96. respons();
  97. stop();
  98. }
  99. uchar add_read_byte(uchar address)        //AT24C02任意地址讀
  100. {
  101. uchar w;
  102. start();
  103. //        respons();
  104. write_byte(0xae);
  105. //        delayms(100);
  106. respons();
  107. write_byte(address);
  108. respons();
  109. start();
  110. write_byte(0xaf);
  111. respons();
  112. w=read_byte();
  113. stop();
  114. return w;
  115. }
  116. void display(uchar shi,uchar ge) //LED數(shù)碼管顯示
  117. {
  118.   //shi=dd/10;
  119.   //ge=dd%10;
  120. wei=0;
  121. duan=1;
  122. P0=table[shi];
  123. duan=0;
  124. P0=0xff;
  125. wei=1;
  126. P0=0xfe;
  127. wei=0;
  128. delayms(10);
  129. P0=0xff;
  130. duan=1;
  131. P0=table[ge];
  132. duan=0;
  133. P0=0xff;
  134. wei=1;
  135. P0=0xfd;
  136.     delayms(5);
  137. wei=0;
  138. }
  139. void stime()        //初始化定時器0并啟動
  140. {
  141. TMOD=0X01;
  142. TH1=(65535-5000)/256;
  143. TH0=(65535-5000)%256;
  144. EA=1;
  145. ET0=1;
  146. TR0=1;
  147. }
  148. void t0()interrupt 1   //定時器0中斷函數(shù)并重新裝初值
  149. {
  150.     uchar i;
  151. TH1=(65535-5000)/256;
  152. TH0=(65535-5000)%256;
  153. i++;
  154. if(i==20)
  155.     {        write++;
  156.     ff=1;
  157. i=0;
  158.    if(write==100)
  159. write=0;
  160. }

  162. }
  163. void main()          //主程序
  164. {
  165. init();
  166. write=add_read_byte(5);
  167.     if(write>100)
  168. write=0;
  169. stime();
  170. while(1)
  171. {
  172.     // dd=write;

  174. if(ff==1)
  175. {
  176.         add_write(5,write);
  177. ff=0;        
  178. }
  179. display(write/10,write%10);
  180. }
  181. }   
復制代碼







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