The Design Of Embedded RFID Reader

The RFID (Radio Frequency Identification) technology introduces the LSI, identification and computer communication technology. It has been used in logistics, manufacturing, public information services and many other fields and greatly enhances the efficiency of management and operation. The RFID technology is in the advantages of fast-mobile identification, multi-target identification and contactless compared with other identification technologies.Based on the in-depth study of the RFID theory and protocol, the RFID reader with the core digital signal processor is designed, achieves functions of the control and communication of RF module, reading signals tags and uploading information, improves the efficiency by ameliorating the anti-collision algorithm.The RFID reader uses the DSP chip as its kernel processing unit.By constructing the DSP/CPLD control module and RF transmitter/receiver module, implements the system modular design, adopts the AC zero signal as the system synchronization clock, extends the system memory by configuring the DSP serial external memory, implements the mutual communication between the reader and the computer application system.Based on ISO15693 protocol, designs data transmission function modules and CRC function module. Moreover, ameliorates the anti-collision algorithm with the purpose of solving the collision of RFID tags, theoretical calculations and experimental analysis shows that the adaptive algorithm can improve the reader's efficiency of the system effectively.