矩阵键盘密码锁

main.c

#include <REGX52.H>
#include "Delay.h"
#include "LCD1602.h"
#include "MatrixKey.h"

//初始化变量
unsigned char KeyNum;
unsigned int Password,Count;

void main()
{
	//LCD屏幕初始化显示Password:
	LCD_Init();
	LCD_ShowString(1,1,"Password:");
	while(1)
	{
		//读取按键数值
		KeyNum=MatrixKey();
		if(KeyNum)
		{
			//按键按下输入密码
			if(KeyNum<=10)	
			{
				//如果输入次数小于4
				if(Count<4)	
				{
					//密码左移一位
					Password*=10;
					//获取一位密码				
					Password+=KeyNum%10;
					//计次+1		
					Count++;	
				}
				LCD_ShowNum(2,1,Password,4);	
			}
			//确认健S11
			if(KeyNum==11)	
			{
				//密码是否为1234
				if(Password==1234)	
				{
					LCD_ShowString(1,14,"OK ");
					//清零	
					Password=0;		
					Count=0;		
					LCD_ShowNum(2,1,Password,4);	
				}
				else				
				{
					LCD_ShowString(1,14,"ERR");	
					Password=0;		
					Count=0;		
					LCD_ShowNum(2,1,Password,4);	
				}
			}
			//取消键S12
			if(KeyNum==12)	
			{
				Password=0;		
				Count=0;		
				LCD_ShowNum(2,1,Password,4);	
			}
			
		}
		
	}
}

MatrixKey.c

#include <REGX52.H>
#include "Delay.h"

unsigned char MatrixKey()
{
	unsigned char KeyNumber=0;
	
	P1=0xFF;
	P1_3=0;
	if(P1_7==0){Delay(20);while(P1_7==0);Delay(20);KeyNumber=1;}
	if(P1_6==0){Delay(20);while(P1_6==0);Delay(20);KeyNumber=5;}
	if(P1_5==0){Delay(20);while(P1_5==0);Delay(20);KeyNumber=9;}
	if(P1_4==0){Delay(20);while(P1_4==0);Delay(20);KeyNumber=13;}
	
	P1=0xFF;
	P1_2=0;
	if(P1_7==0){Delay(20);while(P1_7==0);Delay(20);KeyNumber=2;}
	if(P1_6==0){Delay(20);while(P1_6==0);Delay(20);KeyNumber=6;}
	if(P1_5==0){Delay(20);while(P1_5==0);Delay(20);KeyNumber=10;}
	if(P1_4==0){Delay(20);while(P1_4==0);Delay(20);KeyNumber=14;}
	
	P1=0xFF;
	P1_1=0;
	if(P1_7==0){Delay(20);while(P1_7==0);Delay(20);KeyNumber=3;}
	if(P1_6==0){Delay(20);while(P1_6==0);Delay(20);KeyNumber=7;}
	if(P1_5==0){Delay(20);while(P1_5==0);Delay(20);KeyNumber=11;}
	if(P1_4==0){Delay(20);while(P1_4==0);Delay(20);KeyNumber=15;}
	
	P1=0xFF;
	P1_0=0;
	if(P1_7==0){Delay(20);while(P1_7==0);Delay(20);KeyNumber=4;}
	if(P1_6==0){Delay(20);while(P1_6==0);Delay(20);KeyNumber=8;}
	if(P1_5==0){Delay(20);while(P1_5==0);Delay(20);KeyNumber=12;}
	if(P1_4==0){Delay(20);while(P1_4==0);Delay(20);KeyNumber=16;}
	
	return KeyNumber;
}

MatrixKey.h

#ifndef __MATRIXKEY_H__
#define __MATRIXKEY_H__

unsigned char MatrixKey();

#endif