单片机矩阵键盘显示电路 数码管显示是乱码的情况,怎么办

目的：矩阵键盘显示电路，采用4*4键盘，用4位数码管显示输入的数字，依次将输入数字组合在一起显示

单片机源程序如下:

1. #include <reg51.h>
   
2. unsigned char  WEI[]={0x01,0x02,0x04,0x08,0x10,0x20};
   
3. unsigned char table[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
   
4. unsigned char a[4] = {0,0,0,0};
   
5. unsigned char temp;
   
6. unsigned char key();
   
7. unsigned char i,n,shu;
   
8. void delayms(unsigned int ms);
   
9. void keyscan(void);
   
10. void shuma(unsigned char par,unsigned char dat)
    
11. {
    
12. P2 = WEI[par];
    
13. P0 = table[dat];
    
14. }
    
15. 
    
16. void main()
    
17. {
    
18. i = n = 0;
    
19.   while(1)
    
20.   {
    
21.    shu = key();
    
22.    if(shu !=17)
    
23.    {
    
24.     a[n] = shu;
    
25.     n++;
    
26.     if(n>3) n = 0;
    
27.    }
    
28.    shuma(i,a[i]);
    
29.    i++;
    
30.    if(i>3) i = 0;
    
31.    delayms(10);
    
32.   }
    
33. }
    
34. unsigned char key()
    
35. {
    
36. unsigned char key1;
    
37. key1 = 17;
    
38. P3 = 0xEf;
    
39. if (P3 != 0xEf)
    
40. {
    
41.   delayms(10);
    
42.   switch(P3)
    
43.   {
    
44.    case 0xE7:key1 = 0;break;
    
45.    case 0xEB:key1 = 1;break;
    
46.    case 0xED:key1 = 2;break;
    
47.    case 0xEE:key1 = 3;break;
    
48.   }
    
49.   while(P3 != 0xEf);
    
50. }
    
51. 
    
52. P3 = 0xDF;
    
53. if (P3 != 0xDF)
    
54. {
    
55.   delayms(10);
    
56.   switch(P3)
    
57.   {
    
58.    case 0xD7:key1 = 4;break;
    
59.    case 0xDB:key1 = 5;break;
    
60.    case 0xDD:key1 = 6;break;
    
61.    case 0xDE:key1 = 7;break;
    
62.   }
    
63.   while(P3 != 0xDF);
    
64. 
    
65. }
    
66. 
    
67. P3 = 0xBF;
    
68. if (P3 != 0xBF)
    
69. {
    
70.   delayms(10);
    
71.   switch(P3)
    
72.   {
    
73.    case 0xb7:key1 = 8;break;
    
74.    case 0xBB:key1 = 9;break;
    
75.    case 0xBD:key1 = 10;break;
    
76.    case 0xBE:key1 = 11;break;
    
77.   }
    
78.     while(P3 != 0xBF);
    
79. }
    
80. 
    
81. 
    
82. P3 = 0x7f;
    
83. if (P3 != 0x7f)
    
84. {
    
85. delayms(10);
    
86.   switch(P3)
    
87.   {
    
88.    case 0x77:key1 = 12;break;
    
89.    case 0x7B:key1 = 13;break;
    
90.    case 0x7D:key1 = 14;break;
    
91.    case 0x7E:key1 = 15;break;
    
92.   }
    
93.   while(P3 != 0x7f);
    
94. }
    
95. 
    
96. return key1;
    
97. }
    
98. 
    
99. 
    
100. 
     
101. void delayms(unsigned int ms)
     
102. {
     
103.   unsigned int x,y;
     
104. for (x=ms;x>0;x--)        
     
105.   for(y=120;y>0;y--);
     
106. }

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根本就没乱，那么显眼的“6512”四个数字看不见？？？

送你模块化的程序

Hephaestus 发表于 2023-12-13 23:37
根本就没乱，那么显眼的“6512”四个数字看不见？？？

哈哈    好眼力

1. void shuma(unsigned char par,unsigned char dat)
   
2. {
   
3. P0 = 0xFF;//消影
   
4. P2 = WEI[par];
   
5. P0 = table[dat];
   
6. }

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先试试加消影
感觉共阴共阳弄错了