【求助】单片机四位数码管，不用锁存器，怎么写？

图：数码管是共阴，但打开完全不亮。

我试过，display函数如果写成wela=1再给P0赋值再wela=0屏幕能有显示，

但1234会显示成4123！而wela1，即P2^4确实控制1。

这样。到底显示函数应该怎么写呢？谢谢各位！


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3. #include<reg52.h>
5. unsigned char clear = 0xff;
7. sbit wela1 = P2^4;
8. sbit wela2 = P2^5;
9. sbit wela3 = P2^6;
10. sbit wela4 = P2^7;
11. unsigned char code table[] = {0x3f,0x06,0x5b,0x4f,
12. 0x66,0x6d,0x7d,0x07,
13. 0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0};
15. void delay(int z)
16. {
17. int x,y;
18. for(x=z;x>0;x--)
19. for(y=110;y>0;y--);
20. }
21. void display( char one,char two,char three,char four )
22. {
23. wela1 = wela2 = wela3 = wela4 = 1;
26. wela1 = 0;
27. P0 = clear;
28. P0 = table[one];
29. wela1 = 1;
30. delay(5);
33. wela2 = 0;
34. P0 = clear;
35. P0 = table[two];
36. wela2 = 1;
37. delay(5);
40. wela3 = 0;
41. P0 = clear;
42. P0 = table[three];
43. wela3 = 1;
44. delay(5);
47. wela4 = 0;
48. P0 = clear;
49. P0 = table[four];
50. wela4 = 1;
51. delay(5);
52. }
54. void main()
55. {
56. display(1,2,3,4);
57. }

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