51单片机lcd矩阵键盘密码锁程序初始6位密码

以下是一个基于51单片机和LCD矩阵键盘的简单密码锁程序，初始密码为"123456"：

#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int

sbit RS = P1^0;  //LCD1602的接口定义
sbit RW = P1^1;
sbit EN = P1^2;
sbit k1 = P3^0;  //矩阵键盘的接口定义
sbit k2 = P3^1;
sbit k3 = P3^2;
sbit k4 = P3^3;
sbit k5 = P3^4;
sbit k6 = P3^5;
sbit k7 = P3^6;
sbit k8 = P3^7;

uchar password[6] = {'1', '2', '3', '4', '5', '6'};  //初始密码
uchar input[6];  //输入的密码
uchar i = 0;  //计数器

void delayms(uint x)  //延时函数
{
    uint i, j;
    for(i = x; i > 0; i--)
        for(j = 110; j > 0; j--);
}

void init()  //LCD1602初始化函数
{
    delayms(15);
    RS = 0;
    RW = 0;
    EN = 1;
    P0 = 0x38;
    EN = 0;
    delayms(5);
    EN = 1;
    P0 = 0x38;
    EN = 0;
    delayms(5);
    EN = 1;
    P0 = 0x38;
    EN = 0;
    delayms(5);
    EN = 1;
    P0 = 0x0C;
    EN = 0;
    delayms(5);
    EN = 1;
    P0 = 0x06;
    EN = 0;
    delayms(5);
    EN = 1;
    P0 = 0x01;
    EN = 0;
    delayms(5);
}

void write_com(uchar com)  //写命令函数
{
    RS = 0;
    RW = 0;
    EN = 1;
    P0 = com;
    EN = 0;
    delayms(5);
}

void write_data(uchar dat)  //写数据函数
{
    RS = 1;
    RW = 0;
    EN = 1;
    P0 = dat;
    EN = 0;
    delayms(5);
}

void display(uchar *s)  //显示函数
{
    while(*s != '\0')
        write_data(*s++);
}

void main()
{
    init();
    write_com(0x80);
    display("Enter Password:");
    while(1)
    {
        if(k1 == 0)  //按下1键
        {
            input[i] = '1';
            i++;
            delayms(10);
            while(k1 == 0);
        }
        if(k2 == 0)  //按下2键
        {
            input[i] = '2';
            i++;
            delayms(10);
            while(k2 == 0);
        }
        if(k3 == 0)  //按下3键
        {
            input[i] = '3';
            i++;
            delayms(10);
            while(k3 == 0);
        }
        if(k4 == 0)  //按下4键
        {
            input[i] = '4';
            i++;
            delayms(10);
            while(k4 == 0);
        }
        if(k5 == 0)  //按下5键
        {
            input[i] = '5';
            i++;
            delayms(10);
            while(k5 == 0);
        }
        if(k6 == 0)  //按下6键
        {
            input[i] = '6';
            i++;
            delayms(10);
            while(k6 == 0);
        }
        if(k7 == 0)  //按下7键（确认键）
        {
            if(i == 6)  //输入了6位密码
            {
                uchar j;
                for(j = 0; j < 6; j++)
                {
                    if(input[j] != password[j])  //密码错误
                    {
                        write_com(0xC0);
                        display("Wrong Password!");
                        delayms(1000);
                        write_com(0xC0);
                        display("Enter Password:");
                        i = 0;
                        break;
                    }
                }
                if(j == 6)  //密码正确
                {
                    write_com(0xC0);
                    display("Password Correct");
                    delayms(1000);
                    write_com(0xC0);
                    display("Enter Password:");
                    i = 0;
                }
            }
            else  //输入的密码不足6位
            {
                write_com(0xC0);
                display("Input Incomplete");
                delayms(1000);
                write_com(0xC0);
                display("Enter Password:");
                i = 0;
            }
            while(k7 == 0);
        }
        if(k8 == 0)  //按下8键（清除键）
        {
            write_com(0xC0);
            display("Enter Password:");
            i = 0;
            while(k8 == 0);
        }
        if(i >= 6)  //输入的密码超过6位
        {
            write_com(0xC0);
            display("Password Too Long");
            delayms(1000);
            write_com(0xC0);
            display("Enter Password:");
            i = 0;
        }
    }
}

注意：此代码仅供参考，具体实现要根据实际情况进行调整和优化。