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 ，注意圖中要改一下p3.6和p3.7分別是段和位的鎖存端口.P2口上面是按鍵 p1口上面是8個led燈.
- #include<reg52.h>
- #define uchar unsigned char
- #define uint unsigned int
- uchar code DIS_SEG7[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
- uchar code DIS_BIT[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
- uchar code SKEY[16]={1,2,3,10,4,5,6,11,7,8,9,12,14,0,15,13};
- uchar code act[4]={0xfe,0xfd,0xfb,0xf7};
- sbit D=P3^6;
- sbit V=P3^7;
- //=======================
- void delay(uint k)
- {
- uint data i,j;
- for(i=0;i<k;i++){
- for(j=0;j<121;j++)
- {;}}
- }
- //==============
- void delay10ms(void)
- {
- uint data i,j;
- for(i=0;i<10;i++){
- for(j=0;j<121;j++)
- {;}}
- }
- //================
- char scan_key(void)
- {
- uchar i,j,in,ini,inj;
- bit find=0;
- for(i=0;i<4;i++)
- {
- P1=act[i];
- delay10ms();
- in=P1;
- in=in>>4;
- in=in|0xf0;
- for(j=0;j<4;j++)
- {
- if(act[j]==in)
- {find=1;
- inj=j;ini=i;
- }
- }
- }
- if(find==0)return-1;
- return (ini*4+inj);
- }
- //=======================
- void init(void)
- {TMOD=0x01;
- TH0=-(50000/256);
- TL0=-(50000%256);
- ET0=1;
- TR0=1;
- EA=1;
- }
- //=================
- void main(void)
- {
- init();
- D=1;P0=0xff;D=0;V=1;P0=0xfe;V=0;
- while(1)
- {
- delay(5000);
- }
- }
- //============
- void time0(void) interrupt 1
- {char c;
- uchar key_value;
- TH0=-(50000/256);
- TL0=-(50000%256);
- c=scan_key();
- if(c!=-1)key_value=SKEY[c];
- if(key_value==1){D=1;P0=0xff;D=0;V=1;P0=0xff;V=0;}
- }
-
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