一个RFID rc522程序，采用的是模拟SPI接口，运行在C51平台上，程序利用串口打印卡ID号，还有卡类型，该文件可用作二次开发。(A RFID rc522 program, using the analog SPI interface, run on the C51 platform, the program uses the serial port Print Card ID number, as well as the card type, the file can be used f