protuse仿真4*4键盘和单片LED

#include "reg51.h" unsigned char code LED_CODES[]= { 0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,//0-9 0x77,0x7c,0x39,0x5e,0x79,0x71//A,b,C,d,E }; sbit l1=P0^0; //行线 sbit l2=P0^1; sbit l3=P0^2; sbit l4=P0^3; sbit c1=P0^4; //列线 sbit c2=P0^5; sbit c3=P0^6; sbit c4=P0^7; void dely() {int i; for(i=0;i<1000;i++);} void led( unsigned int m) {P2=LED_CODES[m];} void scan() //扫描法 {unsigned int x,a,j,l=0;//a记录行号，J记录列号，l为有键按下标记 x=0xef; for(j=0;j<4;j++) { P0=x; //第j列为低 if(l1==0){dely();if(l1==0)a=0;l=1;break;} //读行值 else if(l2==0){dely();if(l2==0)a=1;l=1;break;} else if(l3==0){dely();if(l3==0)a=2;l=1;break;} else if(l4==0){dely();if(l4==0)a=3;l=1;break;} x=(x<<1)+1; //下一列为低 } if(l==0)return; //无键按下返回 led(a*4+j); //计算键值并显示 } void main() {P2=0; while(1) { scan(); } }