请编程实现

好的，下面是51单片机的代码实现，实现将PC端串口发送的字符串储存在AT24C02芯片中，并可以通过串口读取存储在AT24C02中的字符串。

#include <reg52.h>
#include <intrins.h>
#include <stdio.h>

#define FOSC 11059200L
#define BAUD 9600

#define SDA P1_0
#define SCL P1_1

sbit LED = P2^0;

unsigned char code write_address = 0xA0; // AT24C02的写地址
unsigned char code read_address = 0xA1; // AT24C02的读地址

bit busy; // 串口发送标志位
unsigned char buffer[128]; // 串口接收缓冲区
unsigned char idx = 0; // 缓冲区索引

void delay_us(unsigned int n) // 延时函数
{
    while(n--)
    {
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        _nop_();
    }
}

void delay_ms(unsigned int n) // 延时函数
{
    while(n--)
    {
        delay_us(1000);
    }
}

void init_uart() // 串口初始化
{
    TMOD |= 0x20;
    SCON = 0x50;
    TH1 = (unsigned char)(256 - FOSC/32/BAUD);
    TL1 = (unsigned char)(256 - FOSC/32/BAUD);
    ES = 1;
    EA = 1;
    TR1 = 1;
}

void uart_send(unsigned char byte) // 串口发送函数
{
    while(busy);
    busy = 1;
    SBUF = byte;
}

void uart_puts(unsigned char *str) // 串口发送字符串函数
{
    while(*str)
    {
        uart_send(*str++);
    }
}

void i2c_start() // I2C总线起始信号
{
    SDA = 1;
    SCL = 1;
    delay_us(5);
    SDA = 0;
    delay_us(5);
    SCL = 0;
}

void i2c_stop() // I2C总线停止信号
{
    SDA = 0;
    SCL = 1;
    delay_us(5);
    SDA = 1;
    delay_us(5);
}

bit i2c_write_ack() // I2C总线写应答信号
{
    bit ack;
    SDA = 1;
    SCL = 1;
    delay_us(5);
    ack = SDA;
    SCL = 0;
    delay_us(5);
    return !ack;
}

void i2c_write_byte(unsigned char byte) // I2C总线写数据函数
{
    unsigned char i;
    for(i = 0; i < 8; i++)
    {
        SDA = (byte & 0x80) ? 1 : 0;
        byte <<= 1;
        SCL = 1;
        delay_us(5);
        SCL = 0;
        delay_us(5);
    }
}

unsigned char i2c_read_byte(bit ack) // I2C总线读数据函数
{
    unsigned char byte = 0;
    unsigned char i;
    for(i = 0; i < 8; i++)
    {
        byte <<= 1;
        SCL = 1;
        delay_us(5);
        byte |= SDA;
        SCL = 0;
        delay_us(5);
    }
    SDA = ack ? 0 : 1;
    SCL = 1;
    delay_us(5);
    SCL = 0;
    delay_us(5);
    return byte;
}

void i2c_write(unsigned char address, unsigned char *data, unsigned char length) // I2C总线写函数
{
    unsigned char i;
    i2c_start();
    i2c_write_byte(address);
    if(!i2c_write_ack())
    {
        i2c_stop();
        return;
    }
    for(i = 0; i < length; i++)
    {
        i2c_write_byte(data[i]);
        if(!i2c_write_ack())
        {
            i2c_stop();
            return;
        }
    }
    i2c_stop();
}

void i2c_read(unsigned char address, unsigned char *data, unsigned char length) // I2C总线读函数
{
    unsigned char i;
    i2c_start();
    i2c_write_byte(address);
    if(!i2c_write_ack())
    {
        i2c_stop();
        return;
    }
    i2c_start();
    i2c_write_byte(address + 1);
    if(!i2c_write_ack())
    {
        i2c_stop();
        return;
    }
    for(i = 0; i < length; i++)
    {
        data[i] = i2c_read_byte(i == length - 1);
    }
    i2c_stop();
}

void main()
{
    unsigned char data[128];
    unsigned char length;
    init_uart();
    while(1)
    {
        if(idx > 0 && buffer[idx - 1] == '\n') // 接收到完整的字符串
        {
            idx--;
            length = idx;
            idx = 0;
            i2c_write(write_address, buffer, length); // 将字符串写入AT24C02中
            uart_puts("Data written to AT24C02: ");
            uart_puts(buffer);
        }
        i2c_read(read_address, data, sizeof(data)); // 从AT24C02中读取字符串
        if(data[0] != 0xFF)
        {
            uart_puts("Data read from AT24C02: ");
            uart_puts(data);
            i2c_write(write_address, "\xFF", 1); // 清空AT24C02中的字符串
        }
    }
}

void uart_isr() interrupt 4 using 1 // 串口中断服务函数
{
    if(RI)
    {
        RI = 0;
        buffer[idx++] = SBUF;
    }
    if(TI)
    {
        TI = 0;
        busy = 0;
    }
}

注意，在使用本程序前需要将AT24C02芯片连接到51单片机的I2C总线上，并根据具体的硬件电路和芯片规格进行配置。另外，本程序使用9600波特率的串口通信，如果需要修改波特率可以修改BAUD宏定义。