STM32-读写RFID.zip
RFID是Radio Frequency Identification的缩写，是一种无接触自动识别技术，利用射频信号及其空间耦合传输特性，实现对静止的或移动中的待识别物品的自动识别 。RFID系统则由两个部分组成，即电子标签和阅读器。
阅读器是将标签中的信息读出，或将标签所需要存储的信息写入标签的装置。根据使用的结构和技术不同，阅读器可以是读/写装置，是RFID系统信息控制和处理中心。阅读器 (问答器) 可放置在一固定地点，如：入口/出口，销售网点、仓库、货栈、大商场；阅读器同样可在移动的范围中使用。
电子标签由收发天线、AC/DC电路、解调电路、逻辑控制电路、存储器和调制电路组成。分为无源电子标签-passive tag，对应无源RFID系统；半无源电子标签-semi-passive tag，对应于半无源RFID系统；有源电子标签—active tag，对应于有源RFID系统；
工作原理
RFID技术的基本工作原理并不复杂：在标签进入磁场后，接收解读器发出的射频信号，凭借感应电流所获得的能量发送出存储在芯片中的产品信息，或者主动发送某一频率的信号；解读器读取信息并解码后，发送至
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