时间：2024.8.30
作者：Whappy
目的：手撕51（第二遍）
代码：
main.c
#include <REGX52.H>
#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 <REGX52.H>
#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1P1_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1P1_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1P1_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1P1_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
