51单片机 05 矩阵键盘

嘻嘻，LCD在RC板子上可以勉强装上，会有一点歪。

一、矩阵键盘

在键盘中按键数量较多时，为了减少I/O口的占用，通常将按键排列成矩阵形式；采用逐行或逐列的“扫描”，就可以读出任何位置按键的状态。（IO口默认高电平1）

代码在文件夹中。我改了LCD代码的延时问题。

MatrixKey.c代码

#include <STC89C5xRC.H>
#include "Delay.h"unsigned char MatrixKey()
{// 按列扫描unsigned char KeyNumber=0;P1=0xFF;P13=0x00;if(P17==0) {Delay(20);while(P17==0);Delay(20);KeyNumber=1;}if(P16==0) {Delay(20);while(P16==0);Delay(20);KeyNumber=5;}if(P15==0) {Delay(20);while(P15==0);Delay(20);KeyNumber=9;}if(P14==0) {Delay(20);while(P14==0);Delay(20);KeyNumber=13;}P1=0xFF;P12=0x00;if(P17==0) {Delay(20);while(P17==0);Delay(20);KeyNumber=2;}if(P16==0) {Delay(20);while(P16==0);Delay(20);KeyNumber=6;}if(P15==0) {Delay(20);while(P15==0);Delay(20);KeyNumber=10;}if(P14==0) {Delay(20);while(P14==0);Delay(20);KeyNumber=14;}P1=0xFF;P11=0x00;if(P17==0) {Delay(20);while(P17==0);Delay(20);KeyNumber=3;}if(P16==0) {Delay(20);while(P16==0);Delay(20);KeyNumber=7;}if(P15==0) {Delay(20);while(P15==0);Delay(20);KeyNumber=11;}if(P14==0) {Delay(20);while(P14==0);Delay(20);KeyNumber=15;}P1=0xFF;P10=0x00;if(P17==0) {Delay(20);while(P17==0);Delay(20);KeyNumber=4;}if(P16==0) {Delay(20);while(P16==0);Delay(20);KeyNumber=8;}if(P15==0) {Delay(20);while(P15==0);Delay(20);KeyNumber=12;}if(P14==0) {Delay(20);while(P14==0);Delay(20);KeyNumber=16;}return KeyNumber;
}

main.c代码

#include <STC89C5xRC.H>
#include "Delay.h"
#include "LCD1602.h"unsigned char KeyNum;void main()
{LCD_Init();LCD_ShowString(1,1,"HelloRain");while(1){KeyNum=MatrixKey();if(KeyNum) LCD_ShowNum(2,1,KeyNum,2);}
}

二、矩阵键盘密码锁

main.c

#include <STC89C5xRC.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) //s1-s10按下，输入密码 {if(count<4){password*=10; //密码左移password+=KeyNum%10; count++;LCD_ShowNum(2,1,password,4);}}else if(KeyNum==11) {if(password==2345){LCD_ShowString(1,14,"OK ");password=0;count=0;LCD_ShowNum(2,1,password,4);}else {LCD_ShowString(1,14,"ERR");password=0;count=0;LCD_ShowNum(2,1,password,4);}}else if(KeyNum==12){password=0;count=0;LCD_ShowNum(2,1,password,4);}}}
}