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1、The Design of RFID Reader based on STM32 Embedded PlatformAbstract： This paper mainly studies the ARM embedded platform based RFID reader， through research on the basic theory of RFID system， including the embedded technology， RFID technology and operating system transplantation， this paper complete
2、d the hardware structure design and application software of RFID system. Finally through the concrete test and verify that the design of the RFID reader meet the design requirements for read and write power consumption and speed. Keywords： STM32； RFID reader； embedded system0 IntroductionsRadio freq
3、uency identification （RFID） technology is regarded as one of the ten most important technologies in twenty-first Century， due to the various national governments and scientific research personnel to support and research， has developed into the logistics， transportation， identification and other appl
4、ications. Now， the traditional label recognition technology can not meet the current requirements of wireless transmission， the new RFID automatic identification technology has been gradually occupy a dominant position in the market. The RFID reader is an important part of RFID system， as the main o
5、bject of research in the field of radio frequency identification， has a great market prospect and wide development space.Study of the RFID reader and RF chip to design RFID products， the key technological is innovation， is an extension of the RFID technology level. The reader in the market has been
6、put into R & D and production of market applications RFID reader products， the core technology is still in a foreign country， most products are mainly dependent on foreign imports， domestic production of RFID reader products mainly relies on foreign custom， thus it can be seen， domestic manufacturer
7、s of technology dependence strong. Therefore， the development of a system of independent intellectual property rights， for the development of the domestic market has been imminent. At the same time， RFID reader should also be of considerable generality can supply different interface.This paper desig
8、ns a set of useful RFID reader， the 2.45GHz microwave frequency band， with wireless data communication， data storage， display， multi function interface and remote transmission and control function. This system can be applied to large-scale logistics， warehousing management， long-range identification
9、， highway toll and other fields， the actual project this paper takes some Research Institute commissioned as background， based on high performance embedded platform as the support， research and design of a complete set of intelligent RFID reader， to form a low cost， to industrial embedded the comput
10、er as the core of the high performance RFID cluster network for the purpose， to reach the rapid identification and recording personnel identity， so that the RFID technology can obtain broader application of space and product market. 1 The basic principle of RFID systemThe RFID system can be regarded
11、 as consisting of four parts according to the function module to classification， respectively is： the label card （RFID）， reader， antenna as well as the background of application system. The working logic relation is： each tag corresponds to a unique tag encoding.The reader is responsible for Interac
12、tive of transmitting signal and data： the first step， the reader send a certain frequency （2.45GHz） radio frequency signal through the transmitting antenna （can be embedded in the reader） ， the radio frequency signal and enters into the RF transmitting antenna radiation area card interactions， the r
13、adio frequency card with energy and is activated， energy excitation induced current； the second step， the energy of the RF card by the induction current will their coding identity information back to the reader through the transmitting antenna and its built-in； next， the reader through the receiving
14、 antenna （can be embedded in the received RF card reader） from the return of the carrier signal， which carries its own code identity information the regulatory role of regulator， the onboard antenna， back to the reader， and then demodulate and decode the signal； finally， reader will debug the signal
15、 returned to the server application， access database to do comparison logic operation data， the judgment of the RF card is valid. The background system according to application of different presupposition， make the appropriate feedback， and issue orders left and right to control the actuator （exists
16、 or not according to the characteristics of the system） for the operation.2 The hardware design of RFID reader / writer2.1 The general principle of RFID hardwareThe typical reader is consists of four modules： RF antenna， transceiver， a control unit and an application system， as shown in figure 2.2.2 The design of reader based on STM32This paper uses the high performance Stm32f103RBT6 as the microprocessor with ARMCortex-M3 as kernel； at the same time， and takes low p
