RC522是一款近距离读写RFID芯片，这是一个层次清晰，高内聚低耦合的代码，很多函数已经测试，可以直接或者移植使用内部的函数应用于自己的项目(RC522 is a short distance read and write RFID chip, which is a clear, highly cohesive, low coupling code. Many functions have been tested and can be used directly or transplanted