此程序是针对I2C总线的读写，如使用24lc256存储芯片，只需根据不同单片机定义io口，便可以直接使用本段代码-This procedure is for I2C bus to read and write, such as the use of memory chips 24lc256, simply depending on the definition of io Singlechip mouth, they can direct the use of this paragraph co