写一个rs04的Arduino iic库

以下是一个简单的Arduino IIC库，可以实现基本的读写操作。请注意，这个库使用的是硬件IIC，因此需要将SDA和SCL引脚连接到Arduino的对应引脚（通常是A4和A5）。此外，需要在Arduino代码中包含Wire.h库。

#include <Wire.h>

#define IIC_TIMEOUT 1000

class IIC {
  private:
    uint8_t address;

  public:
    IIC(uint8_t addr) {
      address = addr;
      Wire.begin();
    }

    int write(uint8_t reg, uint8_t *data, uint8_t len) {
      Wire.beginTransmission(address);
      Wire.write(reg);
      Wire.write(data, len);
      int result = Wire.endTransmission();
      if (result != 0) {
        Serial.print("IIC write error: ");
        Serial.println(result);
      }
      return result;
    }

    int read(uint8_t reg, uint8_t *data, uint8_t len) {
      Wire.beginTransmission(address);
      Wire.write(reg);
      int result = Wire.endTransmission();
      if (result != 0) {
        Serial.print("IIC read error: ");
        Serial.println(result);
        return result;
      }

      uint32_t start_time = millis();
      while (Wire.requestFrom(address, len) != len) {
        if (millis() - start_time > IIC_TIMEOUT) {
          Serial.println("IIC read timeout");
          return -1;
        }
      }

      for (int i = 0; i < len; i++) {
        data[i] = Wire.read();
      }

      return 0;
    }
};

在使用时，可以创建一个IIC对象，并调用其write和read方法来进行读写操作。例如：

IIC iic(0x50);

// Write two bytes to register 0x12
uint8_t data[2] = { 0x34, 0x56 };
iic.write(0x12, data, 2);

// Read four bytes from register 0x34
uint8_t read_data[4];
iic.read(0x34, read_data, 4);