基于WiFi的嵌入式RFID信息传输与显示终端的研发

发布时间：2018-04-11 06:08

本文选题：WiFi + 射频识别　；参考：《吉林大学》2017年硕士论文

【摘要】：科技的迅速发展,带动着嵌入式的应用前景不断的扩宽。嵌入式系统一般体积小,应用专业性强。伴随着传输技术从有线到无线的飞跃,Wi Fi技术也进一步发展。射频识别(RFID,Radio Frequency Identification)技术是一种非接触的微波识别技术,能够在一定范围内对目标进行识别,并且准确度和抗干扰能力强。将嵌入式,无线通信,RFID技术三者相结合,能够应用在很多场合:智能家居,室内监控,刷卡系统等。基于WIFI的嵌入式RFID信息传输与显示终端的研发以会议室刷卡签到系统为背景,在Linux系统嵌入ARM9平台的基础上,针对13.56MHz的RFID卡,研发了一种读卡端与信息处理端分离的RFID卡操作系统。该系统的读卡端与信息处理端利用Wi Fi进行信息交互。本设计主要分为三部分:1)读卡传输端。这部分主要功能是控制器控制读卡芯片对RFID卡进行寻卡,防碰撞,选卡,密钥认证后读取卡内信息并将信息进行适当的格式转换后,通过Wi Fi模块发送出去。由于控制器不需要大量的运算,所以选取了控制能力强,易于上手的STC89C52。读卡芯片选取了高集成度的读卡芯片MFRC500。Wi Fi部分则选用了小巧且超低功耗的ESP8266。本设计一共设计了5个读卡端。2)信息处理终端在以S3C2440为核心处理器的ARM9上,嵌入经过裁剪的Linux系统。并移植网卡驱动,按键驱动,sqlite3数据库等。软件上,利用TCP协议下的socket网络编程搭建允许多客户端接入的服务端,读卡端作为客户端,利用Wi Fi连接到服务端后,服务端采用Linux系统的多进程机制获取信息。获取到的信息经过分类,验证后存储在sqlite3数据库中并可随时通过按键移动到SD卡中,并且将重要信息在LCD屏上显示。3)本地与远端查询功能。由于LCD屏以及硬件的限制,本地查询只能通过按键查询近期的信息。远端查询即PC端的web网页查询,可以通过时间或者Name查询信息并且显示。本文首先阐述了系统的整体设计框架,然后对读卡端,无线通信模块,信息接收、存储、显示、查询模块在硬件与软件层面上进行了详细的说明。本课题中,首先接入一个读卡模块进行调试,然后接入5个读卡终端。经过多次软件的修改与运行调试,最终系统能够准确的读取卡内信息,也能稳定的进行信息存储,显示,查询。
[Abstract]:With the rapid development of science and technology, embedded application prospects continue to expand.Embedded system is small in size and professional in application.Along with the transmission technology from wired to wireless leapfrogging WiFi technology is also further developed.RFID Radio Frequency Identification (RFID) is a non-contact microwave identification technology, which can identify the target in a certain range, and has strong accuracy and anti-jamming ability.With the combination of embedded and wireless RFID technology, it can be used in many situations: smart home, indoor monitoring, credit card system and so on.The research and development of the embedded RFID information transmission and display terminal based on WIFI is based on the boardroom swipe card check-in system, based on the embedded ARM9 platform of the Linux system, aiming at the RFID card of 13.56MHz.In this paper, a RFID card operating system is developed, which is separated from the read card end and the information processing terminal.The card reader and the information processing end of the system interact with each other by Wi Fi.This design is mainly divided into three parts: 1) read card transmission.The main function of this part is that the controller controls the read card chip to search the RFID card, prevent the collision, select the card, read the information of the card after the key authentication and convert the information into proper format, then send it out through the Wi Fi module.Because the controller does not need a lot of operation, the STC89C52, which has strong control ability and is easy to be used, is selected.The card reader chip selects the highly integrated card reader chip MFRC500.Wi Fi, while the small and ultra-low power ESP8266.In this design, a total of 5 reader-card terminals. 2) Information processing terminals are designed to embed the tailor-made Linux system on the ARM9 with S3C2440 as the core processor.And transplant network card driver, keystroke drive sqlite3 database and so on.In software, socket network programming under TCP protocol is used to build the server which allows multiple clients to access, and the card reader is used as the client. After using Wi-Fi to connect to the server, the server uses the multi-process mechanism of the Linux system to obtain information.The obtained information is classified, verified and stored in the sqlite3 database and can be moved to the SD card at any time by keystrokes, and the important information is displayed on the LCD screen. 3) Local and remote query functions.Due to the limitation of LCD screen and hardware, local query can only query recent information by keystroke.Remote query is the PC-side web page query, can be time or Name query information and display.This paper first describes the overall design framework of the system, and then gives a detailed description of the card reader, wireless communication module, information receiving, storage, display and query module at the level of hardware and software.In this topic, first access to a card reading module for debugging, and then access to five card reading terminals.After many times of software modification and debugging, the system can accurately read the card information, but also can stably store, display, query information.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN873;TP391.44;TN92

【相似文献】