标题: 单片机数码管动态扫描 [打印本页]
作者: liuda    时间: 2015-1-21 23:31
标题: 单片机数码管动态扫描
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. sbit D=P3^6;
  7. sbit V=P3^7;
  8. //==============
  9. void delay(uint k)
  10. {
  11. uint data i,j;
  12. for(i=0;i<k;i++){
  13. for(j=0;j<121;j++)
  14. {;}}
  15. }
  16. //===================
  17. void main(void)
  18. {
  19. uchar cnt;
  20. while(1)
  21. {
  22. for(cnt=0;cnt<8;cnt++)
  23. {D=1;P0=DIS_SEG7[cnt+1];D=0;P0=0xff;V=1;P0=DIS_BIT[cnt];V=0;
  24. delay(1);}
  25.    }
  26. }
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