51单片机矩阵键盘控制LCD屏幕

课程资源

B站矩阵键盘课程

实现代码

Delay.c

void Delay(unsigned int xms)		
{
   	//延迟x毫秒
	while(xms--)
	{
   
		unsigned char i, j;

		i = 12;
		j = 169;
		do
		{
   
			while (--j);
		} while (--i);
	}
}

MatrixKey.c

#include 
#include "Delay.h"
#define KEY_SCAN P1

void MatrixKey(unsigned char* keyValue)
{
   
	KEY_SCAN = 0X0F;
	if(KEY_SCAN!=0X0F)
	{
   	//判断是否按下
		Delay(10);	//消除抖动
		
		KEY_SCAN = 0X0F;	//列扫描
		switch(KEY_SCAN)
		{
   
			case 0X07:*keyValue = 0;break;
			case 0X0B:*keyValue = 1;break;
			case 0X0D:*keyValue = 2;break;
			case 0X0E:*keyValue = 3;break;
		}
		
		KEY_SCAN = 0XF0; //行扫描
		switch(KEY_SCAN)
		{
   
			case 0X70:*keyValue = *keyValue;break;
			case