- #include<reg51.h>
- #define ui unsigned char
- ui chuzhi[]={0xfe,0xfd,0xfb,0xf7}; //逐行掃描
- ui jianhou[]={0x77,0x7b,0x7d,0x7e,
- 0xb7,0xbb,0xbd,0xbe,
- 0xd7,0xdb,0xdd,0xde,
- 0xe7,0xeb,0xed,0xee}; //4x4矩陣鍵盤
- ui zifu[]={0x3f,0x06,0x5b,0x4f,0x66,
- 0x6d,0x7d,0x07,0x7f,0x6f}; //共陰極數碼管顯示0~9
- void delay(ui a)
- {
- ui i,j;
- for(i=a;i<0;i--)
- for(j=110;j>0;j--);
- }//延時a毫秒
- void display(ui k)
- {
- P2=0x04; //選中第二個數碼管
- P0=zifu[k/10]; //顯示十位
- delay(20);
- P0=0X00; //顯示清零
- P2=0x00; //選中第一個數碼管
- P0=zifu[k%10]; //顯示個位
- delay(20);
- P0=0X00; //顯示清零
- }
- void main(void)
- {
- ui i=0,j,k;
- while(1)
- {
- P1=chuzhi[i];
- if(P1!=chuzhi[i])
- {
- for(j=0;j<16;j++)
- {
- if(P1==jianhou[j])
- k=j;
- }display(k);
- }i++;
- if(i==4)i=0;
- }
- }
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