说明：  模拟I2C主机的比较多，模拟I2C从机的资源不多，从机相对主机而言要难一些，这个供大家借鉴。 这个从机程序支持主机对它的随机写和随机读，连续读和连续写没做。
(Simulation I2C host more, simulation I2C slave modest resources, from the host machine is relatively more difficult in terms of some of this for your reference. The host from the machine it supports random write and random read, sequential read and sequential write did not do.)