说明：  iiC总线由NXP（原PHILIPS）公司设计，多用于主控制器和从器件间的主从通信，在小数据量场合使用，传输距离短，任意时刻只能有一个主机等特性。此代码为基于单片机的程序。
(The IIC bus is designed by NXP (formerly PHILIPS) and is mainly used for master-slave communication between the master controller and slave devices. It is used in small data occasions with short transmission distance and only one host at any time. This code is based on the microcontroller program.)