本程序为EM4001读写器，读写原理的源代码，程序为KeilC软件版本，其中没有应用定时器-This procedure for the EM4001 reader, read and write the source code of principles, procedures for the KeilC software version, which is not applied Timer

读取ID号后通过串口发送，格式可以通过串口命令修改，检测是否重复发卡，功能代码在串口通讯部分。-Read the ID, through the serial port to send, format can be modified by serial commands, detecting whether repeat hairpin, function code in the serial communication part.