矩陣鍵盤的模塊原理圖：

功能：按下矩陣按鍵，在LCD上顯示對應的數(shù)值。
采用模塊化編程，在此只給出MatrixKey.c 和 main.c 兩部分代碼

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

/*
	矩陣鍵盤讀取鍵碼
	按下不放，會停留在此函數(shù)，松開時返回數(shù)值，不按返回零
*/
unsigned char Matrixkey()
{
	unsigned char KeyNum = 0;
	
	P1 = 0xFF;
	P1_3 = 0;
	if(P1_7 == 0) {Delay(20); while(P1_7 == 0); Delay(20); KeyNum = 1;}
	if(P1_6 == 0) {Delay(20); while(P1_6 == 0); Delay(20); KeyNum = 5;}
	if(P1_5 == 0) {Delay(20); while(P1_5 == 0); Delay(20); KeyNum = 9;}
	if(P1_4 == 0) {Delay(20); while(P1_4 == 0); Delay(20); KeyNum = 13;}
	
	P1 = 0xFF;
	P1_2 = 0;
	if(P1_7 == 0) {Delay(20); while(P1_7 == 0); Delay(20); KeyNum = 2;}
	if(P1_6 == 0) {Delay(20); while(P1_6 == 0); Delay(20); KeyNum = 6;}
	if(P1_5 == 0) {Delay(20); while(P1_5 == 0); Delay(20); KeyNum = 10;}
	if(P1_4 == 0) {Delay(20); while(P1_4 == 0); Delay(20); KeyNum = 14;}
	
	P1 = 0xFF;
	P1_1 = 0;
	if(P1_7 == 0) {Delay(20); while(P1_7 == 0); Delay(20); KeyNum = 3;}
	if(P1_6 == 0) {Delay(20); while(P1_6 == 0); Delay(20); KeyNum = 7;}
	if(P1_5 == 0) {Delay(20); while(P1_5 == 0); Delay(20); KeyNum = 11;}
	if(P1_4 == 0) {Delay(20); while(P1_4 == 0); Delay(20); KeyNum = 15;}
	
	P1 = 0xFF;
	P1_0 = 0;
	if(P1_7 == 0) {Delay(20); while(P1_7 == 0); Delay(20); KeyNum = 4;}
	if(P1_6 == 0) {Delay(20); while(P1_6 == 0); Delay(20); KeyNum = 8;}
	if(P1_5 == 0) {Delay(20); while(P1_5 == 0); Delay(20); KeyNum = 12;}
	if(P1_4 == 0) {Delay(20); while(P1_4 == 0); Delay(20); KeyNum = 16;}
	
	return KeyNum;
}

這里要注意必須先判斷KeyNum是否為0，否則while不斷循環(huán)會不斷顯示0，導致看不到按下按鈕顯示的數(shù)字

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

unsigned char KeyNum;

void main()
{
	LCD_Init();
	LCD_ShowString(1, 1, "HelloWorld");
	
	while(1)
	{
		KeyNum = MatrixKey();
		if(KeyNum) LCD_ShowNum(2, 1, KeyNum, 2);
	}
}

要利用寫好的矩陣鍵盤來制作一個密碼鎖，只需要調(diào)用MatrixKey文件來直接使用即可，以下是一個簡單的密碼鎖，還有一些bug，不過可以滿足基本需求文章來源地址http://www.zghlxwxcb.cn/news/detail-599173.html

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

unsigned char KeyNum;
unsigned int Password, Count;

void main()
{
	LCD_Init();
	LCD_ShowString(1, 1, "PassWord");
	
	while(1)
	{
		KeyNum = MatrixKey();
		if(KeyNum)
		{
			if(KeyNum <= 10) //數(shù)字
			{
				if(Count < 4)
				{
					Password *= 10;
					Password += (KeyNum % 10);
					Count ++; //輸入次數(shù)，最多為4
				}
				LCD_ShowNum(2, 1, Password, 4); //更新顯示
			}
			if(KeyNum == 11) //確認鍵
			{
				if(Password == 1234) //如果等于正確密碼
				{
					LCD_ShowString(1, 14, "OK"); //密碼正確
					Password = 0;
					Count = 0;
					LCD_ShowNum(2, 1, Password, 4); //更新顯示
				}
				else
				{
					LCD_ShowString(1, 14, "ERR"); //密碼錯誤
					Password = 0;
					Count = 0;
					LCD_ShowNum(2, 1, Password, 4); //更新顯示
				}
			}
			if(KeyNum == 12) //取消鍵
			{
				Password = 0;
				Count = 0;
				LCD_ShowNum(2, 1, Password, 4); //更新顯示
			}
		}
	}
}

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