标题: 单片机行列式键盘输入实验 [打印本页]
作者: liuda    时间: 2015-1-21 23:29
标题: 单片机行列式键盘输入实验
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.
  1. #include<reg52.h>
  2. #define uchar unsigned char
  3. #define uint unsigned int
  4. uchar code DIS_SEG7[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
  5. uchar code DIS_BIT[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
  6. uchar code SKEY[16]={1,2,3,10,4,5,6,11,7,8,9,12,14,0,15,13};
  7. uchar code act[4]={0xfe,0xfd,0xfb,0xf7};
  8. sbit D=P3^6;
  9. sbit V=P3^7;
  10. //=======================
  11. void delay(uint k)
  12. {
  13. uint data i,j;
  14. for(i=0;i<k;i++){
  15. for(j=0;j<121;j++)
  16. {;}}
  17. }
  18. //==============
  19. char scan_key(void)
  20. {
  21. uchar i,j,in,ini,inj;
  22. bit find=0;
  23. for(i=0;i<4;i++)
  24. {
  25. P1=act[i];
  26. delay(10);
  27. in=P1;
  28. in=in>>4;
  29. in=in|0xf0;
  30. for(j=0;j<4;j++)
  31. {
  32. if(act[j]==in)
  33. {find=1;
  34. inj=j;ini=i;
  35.        }
  36. }
  37.   }
  38. if(find==0)return-1;
  39. return (ini*4+inj);
  40. }
  41. //===============
  42. void main(void)
  43. {uchar c;
  44. uchar key_value;
  45. while(1)
  46. {
  47. c=scan_key();
  48. if(c!=-1)key_value=SKEY[c];
  49. D=1;P0=DIS_SEG7[key_value];D=0;V=1;P0=DIS_BIT[0];V=0;delay(2);
  50.     }
  51. }
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