你能给我写一份51单片机电梯控制的代码吗

好的，下面是一份简单的51单片机电梯控制代码，代码中使用了按键扫描和LCD1602显示屏进行显示。

#include <reg51.h>
#include <intrins.h>

#define uchar unsigned char
#define uint unsigned int

#define LCD_RS P2_7
#define LCD_RW P2_6
#define LCD_EN P2_5

#define LCD_DATA P0

sbit key1 = P1^0;
sbit key2 = P1^1;
sbit key3 = P1^2;
sbit key4 = P1^3;

uchar code table[] = "Welcome!";
uchar display[4] = {0x80, 0x81, 0x82, 0x83}; // 显示位置

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

void write_command(uchar command) // 写命令
{
    LCD_RS = 0;
    LCD_RW = 0;
    LCD_DATA = command;
    LCD_EN = 1;
    _nop_();
    _nop_();
    LCD_EN = 0;
}

void write_data(uchar data) // 写数据
{
    LCD_RS = 1;
    LCD_RW = 0;
    LCD_DATA = data;
    LCD_EN = 1;
    _nop_();
    _nop_();
    LCD_EN = 0;
}

void init_lcd() // 初始化LCD
{
    write_command(0x38);
    write_command(0x0c);
    write_command(0x06);
    write_command(0x01);
}

void display_table() // 显示欢迎语句
{
    uchar i;
    write_command(0x80);
    for (i = 0; i < 9; i++)
    {
        write_data(table[i]);
        delayms(10);
    }
}

void main()
{
    uchar floor = 1; // 初始楼层为1
    init_lcd();
    display_table();
    while (1)
    {
        if (key1 == 0) // 选择1楼
        {
            floor = 1;
            write_command(0x01); // 清屏
            write_command(display[0]);
            write_data('1');
            delayms(10);
        }
        else if (key2 == 0) // 选择2楼
        {
            floor = 2;
            write_command(0x01); // 清屏
            write_command(display[0]);
            write_data('2');
            delayms(10);
        }
        else if (key3 == 0) // 选择3楼
        {
            floor = 3;
            write_command(0x01); // 清屏
            write_command(display[0]);
            write_data('3');
            delayms(10);
        }
        else if (key4 == 0) // 选择4楼
        {
            floor = 4;
            write_command(0x01); // 清屏
            write_command(display[0]);
            write_data('4');
            delayms(10);
        }
    }
}

以上代码仅供参考，实际使用时需要根据具体需求进行修改。