矩形键盘控制晶体管

#include<reg52.h>#include<delay.h>    //这是我自己写的延时函数头文件#include<shumaguan.h>。//这是我自己写的数码管选数字的头文件typedef unsigned char u8;typedef unsigned int u16;#define jianpan P1#define jingtiguan P0sbit LSA=P2^2;sbit LSB=P2^3;sbit LSC=P2^4;u8 key;u8 deng;void saomiao(void){  char a=0;  jianpan=0x0f;  if(jianpan!=0x0f)  {    delay(10);    if(jianpan!=0x0f)    {      switch(jianpan)      {      case 0x07:        key=0;break;      case 0x0b:        key=1;break;      case 0x0d:        key=2;break;      case 0x0e:        key=3;break;      }    }    jianpan=0xf0;    if(jianpan!=0xf0)    {      switch(jianpan)      {      case 0x70:        key=key+0;break;      case 0xb0:          key=key+4;break;      case 0xd0:         key=key+8;break;      case 0xe0:        key=key+12;break;
      }      while((a<50)&&(jianpan!=0xf0))   //检测按键松手检测                                        //当按键不松手时就始终在这个循环里，当按键松开则跳出循环      {        delay(100);        a++;
      }    }  }}void main(void){  LSA=0; //给一个数码管提供位选  LSB=1;  LSC=0;
  while(1)  {  saomiao();    jingtiguan=shumaguan[key];  }    }