帮我写一个ds1302的读写函数

DS1302是一种实时时钟芯片，常用于电子钟、计时器、温度计等应用。以下是一个简单的DS1302读写函数的代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <wiringPi.h>
#include <wiringPiI2C.h>

#define DS1302_I2C_ADDR 0x68 // DS1302的I2C地址

// DS1302时钟寄存器地址
#define DS1302_REG_SECOND 0x80
#define DS1302_REG_MINUTE 0x82
#define DS1302_REG_HOUR 0x84
#define DS1302_REG_DAY 0x86
#define DS1302_REG_MONTH 0x88
#define DS1302_REG_YEAR 0x8C
#define DS1302_REG_WP 0x8E
#define DS1302_REG_TRICKLE 0x90

// 读取DS1302寄存器的函数
unsigned char ds1302_read_byte(unsigned char reg_addr) {
  unsigned char data;

  // 初始化I2C总线
  int fd = wiringPiI2CSetup(DS1302_I2C_ADDR);

  // 发送读取命令
  wiringPiI2CWrite(fd, reg_addr);

  // 读取数据
  data = wiringPiI2CRead(fd);

  // 关闭I2C总线
  close(fd);

  return data;
}

// 写入DS1302寄存器的函数
void ds1302_write_byte(unsigned char reg_addr, unsigned char data) {
  // 初始化I2C总线
  int fd = wiringPiI2CSetup(DS1302_I2C_ADDR);

  // 发送写入命令和数据
  wiringPiI2CWriteReg8(fd, reg_addr, data);

  // 关闭I2C总线
  close(fd);
}

// 读取DS1302时钟的函数
void ds1302_read_clock(unsigned char *second, unsigned char *minute, 
                        unsigned char *hour, unsigned char *day, 
                        unsigned char *month, unsigned char *year) {
  // 从DS1302读取时钟数据
  *second = ds1302_read_byte(DS1302_REG_SECOND);
  *minute = ds1302_read_byte(DS1302_REG_MINUTE);
  *hour = ds1302_read_byte(DS1302_REG_HOUR);
  *day = ds1302_read_byte(DS1302_REG_DAY);
  *month = ds1302_read_byte(DS1302_REG_MONTH);
  *year = ds1302_read_byte(DS1302_REG_YEAR);
}

// 写入DS1302时钟的函数
void ds1302_write_clock(unsigned char second, unsigned char minute, 
                        unsigned char hour, unsigned char day, 
                        unsigned char month, unsigned char year) {
  // 写入DS1302时钟数据
  ds1302_write_byte(DS1302_REG_WP, 0); // 允许写入
  ds1302_write_byte(DS1302_REG_SECOND, second);
  ds1302_write_byte(DS1302_REG_MINUTE, minute);
  ds1302_write_byte(DS1302_REG_HOUR, hour);
  ds1302_write_byte(DS1302_REG_DAY, day);
  ds1302_write_byte(DS1302_REG_MONTH, month);
  ds1302_write_byte(DS1302_REG_YEAR, year);
  ds1302_write_byte(DS1302_REG_WP, 0x80); // 禁止写入
}

int main(void) {
  unsigned char second, minute, hour, day, month, year;

  // 初始化WiringPi库和I2C总线
  wiringPiSetup();
  wiringPiI2CSetup(DS1302_I2C_ADDR);

  // 读取DS1302时钟
  ds1302_read_clock(&second, &minute, &hour, &day, &month, &year);

  // 输出时钟数据
  printf("Time: %02d:%02d:%02d %02d/%02d/%02d\n", hour, minute, second, day, month, year);

  // 写入DS1302时钟
  ds1302_write_clock(0, 10, 22, 27, 2, 21); // 时间设置为 22:10:00 2021-02-27

  // 读取DS1302时钟
  ds1302_read_clock(&second, &minute, &hour, &day, &month, &year);

  // 输出时钟数据
  printf("Time: %02d:%02d:%02d %02d/%02d/%02d\n", hour, minute, second, day, month, year);

  return 0;
}

注意：以上代码只是一个示例，实际使用中需要根据自己的需求进行修改。同时，需要在树莓派上安装 WiringPi 库，以便使用 I2C 总线。