标题: 单片机实时时钟实验程序 [打印本页]
作者: liuda    时间: 2015-1-21 23:33
标题: 单片机实时时钟实验程序
是用51hei单片机开发板 电路图详见：http://www.51hei.com/f/51hei-5.pdf  的数码管部分， 用2个74hc573 锁存，p0口作为数据口 ，注意图中要改一下p3.6和p3.7分别是段和位的锁存端口.P2口上面是按键 p1口上面是8个led灯.  你用单片机自带的定时器来做时钟
  1. #include<reg52.h>
  2. #define uchar unsigned char
  3. #define uint unsigned int
  4. uchar code SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
  5. uchar  ACT[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
  6. uchar code WEEK_SEG7[8]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x7f};
  7. sbit D=P3^6;
  8. sbit V=P3^7;
  9. uchar deda,sec,min,hour,week=1;
  10. uchar cnt;
  11. //===========
  12. void init(void)
  13. {
  14. TMOD=0x11;
  15. TH0=-(50000/256);
  16. TL0=-(50000%256);
  17. ET0=1;
  18. TR0=1;
  19. TH1=-(1000/256);
  20. TL1=-(1000%256);
  21. ET1=1;
  22. TR1=1;
  23. EA=1;
  24. }
  25. //==========
  26. void time0(void) interrupt 1
  27. {
  28. TH0=-(50000/256);
  29. TL0=-(50000%256);
  30. deda++;
  31. }
  32. //============
  33. void time1(void) interrupt 3
  34. {
  35. TH1=-(1000/256);
  36. TL1=-(1000%256);
  37. if(++cnt>7)cnt=0;
  38. switch(cnt)
  39. {
  40. case 0:D=1;P0=SEG7[sec%10];D=0;P0=0xff;V=1;P0=ACT[5];V=0;break;
  41. case 1:D=1;P0=SEG7[sec/10];D=0;P0=0xff;V=1;P0=ACT[4];V=0;break;
  42. case 2:D=1;P0=SEG7[min%10];D=0;P0=0xff;V=1;P0=ACT[3];V=0;break;
  43. case 3:D=1;P0=SEG7[min/10];D=0;P0=0xff;V=1;P0=ACT[2];V=0;break;
  44. case 4:D=1;P0=SEG7[hour%10];D=0;P0=0xff;V=1;P0=ACT[1];V=0;break;
  45. case 5:D=1;P0=SEG7[hour/10];D=0;P0=0xff;V=1;P0=ACT[0];V=0;break;
  46. case 6:D=1;P0=0x00;D=0;P0=0xff;V=1;P0=0xff;V=0;break;
  47. case 7:D=1;P0=WEEK_SEG7[week];D=0;P0=0xff;V=1;P0=ACT[7];V=0;break;
  48. default:break;
  49.     }
  50. }
  51. //========
  52. void conv(void)
  53. {
  54. if(deda>=20){deda=0;sec++;}
  55. if(sec>=60){sec=0;min++;}
  56. if(min>=60){min=0;hour++;}
  57. if(hour>=24){hour=0;week++;}
  58. if(week>7){week=1;}
  59. }
  60. //===========
  61. void delay(uint k)
  62. {
  63. uint data i,j;
  64. for(i=0;i<k;i++){
  65. for(j=0;j<121;j++)
  66. {;}}
  67. }
  68. //========
  69. uchar scan_key(void)
  70. {
  71. uchar temp;
  72. P2=0xff;
  73. temp=P2;
  74. if(temp!=0xff)
  75. {delay(20);
  76. temp=P2;
  77. if(temp!=0xff)return temp;
  78. }
  79. return 0;
  80. }
  81. //===================
  82. void main(void)
  83. {uchar key_flag;
  84. init();
  85. while(1)
  86. {
  87. conv();
  88. key_flag=scan_key();
  89. switch(key_flag)
  90. {
  91. case 0xef:if(++min>59)min=0;delay(300);break;
  92. case 0xdf:if(++hour>23)hour=0;delay(300);break;
  93. case 0xbf:if(++week>7)week=1;delay(300);break;
  94. default:break;
  95.         }
  96. }
  97. }
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