Study On The Hand-held Reader Based On μCLinux

Radio Frequency Identification (RFID ) is a non-contact automatic identification technology based on radio frequency communications. It is known for low human intervention, fast identification, far enough identification distance, moveable identification, multi-targets identification and good environmental adaptability. RFID , which is the basic technology and important member of IOT (Internet of Things), will probably achieve breakthrough going along with increasing IOT construction.RFID system is classified into LF (Low Frequency), HF (High Frequency), UHF (Ultra High Frequency) and microwave system, according to different frequency of the carrier. In comparison, LF system defect characterized by limited data capacity and read-only. Meanwhile UHF and microwave system is more costly, although it identification distance is far enough. The HF system meet those demand well, whose identification distance is short than 1.5 meter. Beyond that, the modest cost of HF system made it used largely in the field of production automation, electronic notes, library management, access control, attendance record. Therefore, it is highly significant in research of hand-held HF RFID reader.A hand-held HF RFID reader is designed and implemented in this thesis, which is characterized by stable performance, simple operation, abundant interfaces, multi-protocol compatibility and friendly operate interface. After analyzing of the HF protocol ISO14443A/B and ISO15693, the main works are realized as follow:1. Basic theory such as principle, system composition and classification on RFID is summarized.2. Through careful analysis of factors as difficulty in developing, cost and cycle, the overall project designed of this system both software and hardware is given.3. Hardware circuit design and simulation of all modules has been realized. Power management, system control and radio frequency transceiver are mainly focused on in this part.4. In order to match hardware platform of the system,μCLinux operation system transplantation has realized. 5. Drivers for each modules and application based on operation system have compiled and debugged.6. Having an overall consideration of software and hardware, the system has been debugged and the system performance testing has made.7. In the end, a summary to this issue has been made. At the same time, shortcomings of this design have pointed out and a personal opinion to the future development in this field is described here.This thesis made an improvement to multi-standard compatibility, low power, system miniaturization and stability. To achieve these goals, the following measures have been taken in this design: a radio frequency transceiver module, which owns the same interface, has embedded to this system in order to make this handset compatible with three HF international standards. To low down system power, a strict control to power consumption from both software and hardware has been made. To minimize the whole system, we improve both chip selection and PCB design. To obtain high system performance and reliability, those key modules have been simulated and tested strictly.