標(biāo)題: E2PROM 24c02測試程序源代碼 [打印本頁]
作者: niujia    時間: 2015-7-15 23:16
標(biāo)題: E2PROM 24c02測試程序源代碼

數(shù)碼管顯示部分的原理圖：http://www.torrancerestoration.com/f/51hei-5.pdf

源代碼如下：

  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);

  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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