矩阵键盘密码锁

#include <REGX52.H>
#include "Delay.h"
#include "LCD1602.h"
#include "MatrixKey.h"
unsigned char KeyNum;
unsigned int Password=0,Count=0;
void main()
{
  LCD_Init();
  LCD_ShowString(1,1,"Password:");
  while(1)
  {
    KeyNum=MatrixKey();
    if(KeyNum)
    {
      if(KeyNum<=10)  //如果S1~S10按键按下，输入密码
      {
        if(Count<4) //如果输入次数小于4
        {
          Password*=10;       //密码左移一位
          Password+=KeyNum%10;    //获取一位密码
          Count++;  //计次加一
        }
        LCD_ShowNum(2,1,Password,4);  //更新显示
      }
      if(KeyNum==11)  //如果S11按键按下，确认
      {
        if(Password==2345)  //如果密码等于正确密码
        {
          LCD_ShowString(1,14,"OK "); //显示OK
          Password=0;   //密码清零
          Count=0;    //计次清零
          LCD_ShowNum(2,1,Password,4);  //更新显示
        }
        else        //否则
        {
          LCD_ShowString(1,14,"ERR"); //显示ERR
          Password=0;   //密码清零
          Count=0;    //计次清零
          LCD_ShowNum(2,1,Password,4);  //更新显示
        }
      }
      if(KeyNum==12)  //如果S12按键按下，取消
      {
        Password=0;   //密码清零
        Count=0;    //计次清零
        LCD_ShowNum(2,1,Password,4);  //更新显示
      }
    }
  }
}