帮我写一个基于51单片机的lcd1602显示浮点数的程序，精确到小数点后两位

好的，以下是基于51单片机的lcd1602显示浮点数的程序，精确到小数点后两位：

#include <reg51.h>
#include <stdio.h>
#include <string.h>

#define LCD_DATAPORT P0
sbit LCD_RS = P2^0;
sbit LCD_RW = P2^1;
sbit LCD_EN = P2^2;

void LCD_Init();
void LCD_WriteCommand(unsigned char cmd);
void LCD_WriteData(unsigned char dat);
void LCD_WriteString(unsigned char x, unsigned char y, unsigned char *str);
void LCD_WriteFloat(unsigned char x, unsigned char y, float num);

void main()
{
    float num = 3.14;
    char str[16];

    LCD_Init();

    while(1)
    {
        LCD_WriteFloat(0, 0, num);
    }
}

void LCD_Init()
{
    LCD_WriteCommand(0x38); // function set
    LCD_WriteCommand(0x0c); // display on, cursor off, blink off
    LCD_WriteCommand(0x06); // entry mode set
    LCD_WriteCommand(0x01); // clear display
    LCD_WriteCommand(0x80); // set DDRAM address
}

void LCD_WriteCommand(unsigned char cmd)
{
    LCD_RS = 0;
    LCD_RW = 0;
    LCD_EN = 1;
    LCD_DATAPORT = cmd;
    LCD_EN = 0;
}

void LCD_WriteData(unsigned char dat)
{
    LCD_RS = 1;
    LCD_RW = 0;
    LCD_EN = 1;
    LCD_DATAPORT = dat;
    LCD_EN = 0;
}

void LCD_WriteString(unsigned char x, unsigned char y, unsigned char *str)
{
    unsigned char addr;

    if(y == 0)
    {
        addr = 0x80 + x;
    }
    else
    {
        addr = 0xc0 + x;
    }

    LCD_WriteCommand(addr);

    while(*str != '\0')
    {
        LCD_WriteData(*str);
        str++;
    }
}

void LCD_WriteFloat(unsigned char x, unsigned char y, float num)
{
    char str[16];
    sprintf(str, "%.2f", num);
    LCD_WriteString(x, y, str);
}

注：该程序中使用了 `sprintf()` 函数，需要包含 `<stdio.h>` 库。