标题: 单片机输入数的大小比较及判断实验 [打印本页]

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作者: liuda    时间: 2015-1-21 22:50
标题: 单片机输入数的大小比较及判断实验
是用51hei单片机开发板 电路图详见：http://www.51hei.com/f/51hei-5.pdf   用2个74hc573 锁存，p0口作为数据口 ，p3.6和p3.7分别是段和位的锁存端口.

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. sbit D=P3^6;
   
6. sbit V=P3^7;
   
7. //===================
   
8. uchar a=0,b=0,c;
   
9. //===================
   
10. uchar key_S1(void);
    
11. uchar key_S2(void);
    
12. void delay(uint k);
    
13. //=====================
    
14. void main(void)
    
15. {  uchar i;
    
16. while(1)
    
17. {
    
18. b=key_S1();
    
19. a=key_S2();
    
20. if(a>b)c=0x76;
    
21. if(a<b)c=0x38;
    
22. if(a==b)c=0x09;
    
23. for(i=0;i<50;i++)
    
24. {
    
25. D=1;
    
26. P0=SEG7[a];
    
27. D=0;
    
28. P0=0xff;
    
29. V=1;
    
30. P0=0xfe;
    
31. V=0;
    
32. delay(2);
    
33. D=1;
    
34. P0=SEG7[b];
    
35. D=0;
    
36. P0=0xff;
    
37. V=1;
    
38. P0=0xfd;
    
39. V=0;
    
40. delay(2);
    
41. D=1;
    
42. P0=c;
    
43. D=0;
    
44. P0=0xff;
    
45. V=1;
    
46. P0=0xfb;
    
47. V=0;
    
48. delay(2);
    
49.       }
    
50. }
    
51. }
    
52. //==============
    
53. void delay(uint k)
    
54. {
    
55. uint i,j;
    
56. for(i=0;i<k;i++){
    
57. for(j=0;j<121;j++)
    
58. {;}}
    
59. }
    
60. //===================
    
61. uchar key_S1(void)
    
62. {static uchar x;
    
63. P2=0xff;
    
64. if(P2!=0xff)
    
65. {delay(10);
    
66. if(P2==0xdf)
    
67. {
    
68. x=x+1;
    
69.   }
    
70.   }
    
71. if(x>9)x=0;
    
72. return x;
    
73. }
    
74. //=======================
    
75. uchar key_S2(void)
    
76. {static uchar y;
    
77. P2=0xff;
    
78. if(P2!=0xff)
    
79. {delay(10);
    
80. if(P2==0xbf)
    
81. {
    
82. y=y+1;
    
83.   }
    
84.   }
    
85. if(y>9)y=0;
    
86. return y;
    
87. }

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