c51--矩阵键盘-Toy模板网

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此后由于代码量增加，需要进行模块化

模块化就是C语言的多文件编译，通过把一个或者几个功能函数写在其他c文件里，在main.c里面通过应用相应的h文件就可以直接调用功能函数，这样main.c文件不至于复杂冗长。如果没学过可以去B站找一下相关视频（推荐翁恺C语言），或者就地找相关文章，例如这位老哥写得比较完善http://t.csdn.cn/z3pV7。

矩阵键盘显示键码值

矩阵键盘为了减少I/O口采用的是将按键排列成矩阵形式，按逐行或者逐列扫描就能读出任意按键的按下（同一时间只能按下一个）。下面是矩阵按键的原理图：
c51矩阵键盘,c51入门,c++,c语言,单片机
matrixkey.h文件

#ifndef __MATRIXKEY_H__
#define __MATRIXKEY_H__
unsigned char MatrixKey();

#endif

delay.h文件

#ifndef __DELAY_H__
#define __DELAY_H__
void Delay(unsigned int xms);

#endif

delay.c文件

void Delay(unsigned int xms)		//@11.0592MHz
{
	unsigned char i, j;
	while(xms)
	{
		i = 2;
		j = 199;
		do
		{
			while (--j);
		} while (--i);
		xms--;
	}
}

matrixkey.c文件（函数写一个就行）

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


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


unsigned char MatrixKey()//按列扫描
{
    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;
}

主函数：
main.c文章来源地址https://www.toymoban.com/news/detail-571122.html

#include <REGX52.H>
#include "matrixket.h"
#include "delay.h"


unsigned KeyNum;
void main()
{
    while(1)
    {
        KeyNum = MatrixKey();
        if(KeyNum)
        {
            //显示操作等等
        }
    }
}