51单片机-矩阵键盘（基于LC602）

时间：2024.8.30

作者：Whappy

目的：手撕51（第二遍）

代码：

main.c

#include 
#include "LCD1602.h"
#include "Delay.h"
#include "MatrixKey.h"

unsigned char KeyNum;

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

MatrixKey.c

#include 
#include "Delay.h"




unsigned char MatrixKey()
{
	unsigned char KeyNumber = 0;
	

/***************************************
	软件按键消抖
	如果P1_7按下则延时20ms，用while(P1_7 == 0);检测一下P1_7 == 0确实按下了，接下来手松开再延时20ms
***************************************/
	
	//第1列扫描
	P1 = 0XFF;   //所有的管脚置1
	P1_3 = 0;  //第一列置0，准备检测通过P1_7 - P1_4给低电平检测按键是否按下
	if(P1_7 == 0) 
	{
		Delay(20); 
		while(P1_7 == 0); 
		Delay(20);
		KeyNumber = 1;
	}
	if(P1_6 == 0) 
	{
		Delay(20); 
		while(P1_7 == 0); 
		Delay(20);
		KeyNumber = 5;
	}
	if(P1_5 == 0) 
	{
		Delay(20); 
		while(P1_7 == 0); 
		Delay(20);
		KeyNumber = 9;
	}
	if(P1_4 == 0) 
	{
		Delay(20); 
		while(P1_7 == 0); 
		Delay(20);
		KeyNumber = 13;
		
	}
	
	//第2列扫描
	P1 = 0XFF;   //所有的管脚置1
	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_7 == 0); 
		Delay(20);
		KeyNumber = 6;
	}
	if(P1_5 == 0) 
	{
		Delay(20); 
		while(P1_7 == 0); 
		Delay(20);
		KeyNumber =10;
	}
	if(P1_4 == 0) 
	{
		Delay(20); 
		while(P1_7 == 0); 
		Delay(20);
		KeyNumber = 14;
		
	}
	
	//第3列扫描
	P1 = 0XFF;   //所有的管脚置1
	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_7 == 0); 
		Delay(20);
		KeyNumber = 7;
	}
	if(P1_5 == 0) 
	{
		Delay(20); 
		while(P1_7 == 0); 
		Delay(20);
		KeyNumber = 11;
	}
	if(P1_4 == 0) 
	{
		Delay(20); 
		while(P1_7 == 0); 
		Delay(20);
		KeyNumber = 15;
		
	}
	
	//第4列扫描
	P1 = 0XFF;   //所有的管脚置1
	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_7 == 0); 
		Delay(20);
		KeyNumber = 8;
	}
	if(P1_5 == 0) 
	{
		Delay(20); 
		while(P1_7 == 0); 
		Delay(20);
		KeyNumber = 12;
	}
	if(P1_4 == 0) 
	{
		Delay(20); 
		while(P1_7 == 0); 
		Delay(20);
		KeyNumber = 16;
		
	}
	
	
	return KeyNumber;
	
}

Matrix.h

#ifndef __MATRIXKEY_H__
#define __MATRIXKEY_H__

unsigned char MatrixKey();


#endif

其他缺失的函数可在主页上个工程看到

现象：