是用51hei單片機開發板 電路圖詳見：http://www.zg4o1577.cn/f/51hei-5.pdf 的數碼管部分， 用2個74hc573 鎖存，p0口作為數據口 ，p3.6和p3.7分別是段和位的鎖存端口.P2口上面是按鍵- #include<reg52.h>
- #define uchar unsigned char
- #define uint unsigned int
- uchar code SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
- sbit D=P3^6;
- sbit V=P3^7;
- sbit P2_4=P2^4;
- //==============
- void swap(uchar*x,uchar*y);
- //===================
- void delay(uint k)
- {
- uint i,j;
- for(i=0;i<k;i++){
- for(j=0;j<121;j++)
- {;}}
- }
- //==================
- void main(void)
- {
- uchar i;
- uchar a=3,b=8;
- uchar *pt1,*pt2;
- pt1=&a;
- pt2=&b;
- while(1)
- {
- if(!P2_4)swap(pt1,pt2);
- for(i=0;i<100;i++)
- {D=1;P0=SEG7[a];D=0;P0=0xff;V=1;P0=0xfe;V=0;delay(5);
- D=1;P0=SEG7[b];D=0;P0=0xff;V=1;P0=0xfd;V=0;delay(5);}
- }
- }
- //================
- void swap(uchar*x,uchar*y)
- {
- uchar t;
- t=*x;
- *x=*y;
- *y=t;
- }
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