写一个51单片机4*4矩阵控制lcd显示程序，要求每一个按键对应一个数字

好的，以下是51单片机4*4矩阵控制LCD显示程序，请参考：

#include <reg51.h>

//定义端口
#define LCD_DB P0
sbit LCD_RS = P2^0;
sbit LCD_RW = P2^1;
sbit LCD_EN = P2^2;

//定义矩阵键盘端口
sbit Row1 = P1^0;
sbit Row2 = P1^1;
sbit Row3 = P1^2;
sbit Row4 = P1^3;
sbit Col1 = P1^4;
sbit Col2 = P1^5;
sbit Col3 = P1^6;
sbit Col4 = P1^7;

//函数声明
void delay(unsigned int i);
void LCD_Init(void);
void LCD_Write_Cmd(unsigned char cmd);
void LCD_Write_Data(unsigned char dat);
void LCD_Write_String(unsigned char x, unsigned char y, unsigned char *s);
unsigned char Key_Scan(void);
unsigned char Key_Get(void);

void main()
{
    unsigned char key, num;
    unsigned char str[4] = {0};
    
    LCD_Init();
    
    while(1)
    {
        key = Key_Get();
        if(key != 0)
        {
            num = key - '0';
            str[3] = num % 10 + '0';
            num /= 10;
            str[2] = num % 10 + '0';
            num /= 10;
            str[1] = num % 10 + '0';
            num /= 10;
            str[0] = num + '0';
            LCD_Write_String(0, 0, str);
        }
    }
}

//延时函数
void delay(unsigned int i)
{
    unsigned int j, k;
    for(j = i; j > 0; j--)
        for(k = 125; k > 0; k--);
}

//LCD初始化函数
void LCD_Init(void)
{
    LCD_Write_Cmd(0x38);
    LCD_Write_Cmd(0x0c);
    LCD_Write_Cmd(0x06);
    LCD_Write_Cmd(0x01);
    delay(10);
}

//LCD写命令函数
void LCD_Write_Cmd(unsigned char cmd)
{
    LCD_RS = 0;
    LCD_RW = 0;
    LCD_EN = 0;
    LCD_DB = cmd;
    delay(10);
    LCD_EN = 1;
    delay(10);
    LCD_EN = 0;
}

//LCD写数据函数
void LCD_Write_Data(unsigned char dat)
{
    LCD_RS = 1;
    LCD_RW = 0;
    LCD_EN = 0;
    LCD_DB = dat;
    delay(10);
    LCD_EN = 1;
    delay(10);
    LCD_EN = 0;
}

//LCD写字符串函数
void LCD_Write_String(unsigned char x, unsigned char y, unsigned char *s)
{
    unsigned char i;
    if(x < 16)
    {
        if(y == 0)
            LCD_Write_Cmd(0x80 + x);
        else
            LCD_Write_Cmd(0xc0 + x);
    }
    for(i = 0; s[i] != '\0'; i++)
        LCD_Write_Data(s[i]);
}

//矩阵键盘扫描函数
unsigned char Key_Scan(void)
{
    unsigned char key_value = 0;
    Row1 = 0, Row2 = 1, Row3 = 1, Row4 = 1;
    if(Col1 == 0)
    {
        delay(10);
        if(Col1 == 0)
        {
            key_value = '1';
            while(!Col1);
        }
    }
    if(Col2 == 0)
    {
        delay(10);
        if(Col2 == 0)
        {
            key_value = '2';
            while(!Col2);
        }
    }
    if(Col3 == 0)
    {
        delay(10);
        if(Col3 == 0)
        {
            key_value = '3';
            while(!Col3);
        }
    }
    if(Col4 == 0)
    {
        delay(10);
        if(Col4 == 0)
        {
            key_value = 'A';
            while(!Col4);
        }
    }
    Row1 = 1, Row2 = 0, Row3 = 1, Row4 = 1;
    if(Col1 == 0)
    {
        delay(10);
        if(Col1 == 0)
        {
            key_value = '4';
            while(!Col1);
        }
    }
    if(Col2 == 0)
    {
        delay(10);
        if(Col2 == 0)
        {
            key_value = '5';
            while(!Col2);
        }
    }
    if(Col3 == 0)
    {
        delay(10);
        if(Col3 == 0)
        {
            key_value = '6';
            while(!Col3);
        }
    }
    if(Col4 == 0)
    {
        delay(10);
        if(Col4 == 0)
        {
            key_value = 'B';
            while(!Col4);
        }
    }
    Row1 = 1, Row2 = 1, Row3 = 0, Row4 = 1;
    if(Col1 == 0)
    {
        delay(10);
        if(Col1 == 0)
        {
            key_value = '7';
            while(!Col1);
        }
    }
    if(Col2 == 0)
    {
        delay(10);
        if(Col2 == 0)
        {
            key_value = '8';
            while(!Col2);
        }
    }
    if(Col3 == 0)
    {
        delay(10);
        if(Col3 == 0)
        {
            key_value = '9';
            while(!Col3);
        }
    }
    if(Col4 == 0)
    {
        delay(10);
        if(Col4 == 0)
        {
            key_value = 'C';
            while(!Col4);
        }
    }
    Row1 = 1, Row2 = 1, Row3 = 1, Row4 = 0;
    if(Col1 == 0)
    {
        delay(10);
        if(Col1 == 0)
        {
            key_value = '*';
            while(!Col1);
        }
    }
    if(Col2 == 0)
    {
        delay(10);
        if(Col2 == 0)
        {
            key_value = '0';
            while(!Col2);
        }
    }
    if(Col3 == 0)
    {
        delay(10);
        if(Col3 == 0)
        {
            key_value = '#';
            while(!Col3);
        }
    }
    if(Col4 == 0)
    {
        delay(10);
        if(Col4 == 0)
        {
            key_value = 'D';
            while(!Col4);
        }
    }
    return key_value;
}

//获取矩阵键盘按键值
unsigned char Key_Get(void)
{
    unsigned char key = 0;
    while(1)
    {
        key = Key_Scan();
        if(key != 0)
            return key;
    }
}

这个程序使用了4*4矩阵键盘，每个按键对应一个数字。当按下一个按键时，LCD屏幕会显示对应的数字。程序中的Key_Scan函数用来扫描矩阵键盘，Key_Get函数用来获取按下的键值。LCD_Write_Cmd用来写LCD命令，LCD_Write_Data用来写LCD数据，LCD_Write_String用来写字符串。请注意，程序中的端口定义可能需要根据具体硬件进行修改。