Design of Ferromagnetic Resonance Monitoring System of Electric System
Zhe Yu · Advances in intelligent systems research/Advances in Intelligent Systems Research · 2015
The paper designs a ferromagnetic resonance monitoring system of electric system, and the key problem is to select system microprocessor.The paper firstly researches and analyzes the actual research and model selection of ARM chip in the design, and expounds type selection principle of ferromagnetic resonance monitoring system, and analyzes the characteristics of LPC2214 ARM microprocessor of the system.Then, the paper proposes the requirements and design objective of the system.Lastly, the paper proposes the design scheme of the ferromagnetic resonance monitoring system. Model Selection of ARM MicroprocessorStructure of ARM microprocessor.ARM microprocessor has 37 registers, and is divided into several groups (Bank).The registers include, 31 common registers including program counter (PC pointer), which are 32-bit registers.6 state registers, which are used to identify working condition of CPU and running status of program and are 32 bit.And only some are used.ARM processor has 7 different processor modes, Under each processor mode, there are a group of registers, which means that under any processor mode, the addressable registers include 15 common registers(R0～R14), one or two state registers and program counters.In RISC architecture, ARM microprocessor supports two instruction sets, ARM instruction set and Thumb instruction set.The length of ARM instruction is 32 bit, and the length of Thumb instruction is 16 bit.Thumb instruction set is functional subset f ARM instruction set, which not only can save 30﹪～40﹪ memory space compared with equivalent ARM code, but also has the advantages of 32-bit code. Type selection of ARM Microprocessor Application of System.ARM microprocessor has many advantages.With the development of embedded application fields at home and abroad, ARM microprocessor is widely applied.However, ARM microprocessor has more than ten kernel structures, has many manufactures of chips, and various internal functional configuration combinations, which makes developers difficult to make selection schemes.How to select a proper ARM microprocessor for ferromagneticv resonance monitoring system of electric system is an important problem in the initial stage of constructing system.Starting from the perspective of application, the paper analyzes the selection of ARM microprocessor, as follows.Selection of ARM microprocessor core.ARM microprocessor includes a series of kernel structures to adapt to different application fields.If the users hope to use WinCE or standard Linux to reduce software development time, it needs t select ARM720T with ARM chip of MMU (Memory Management Unit), such as ARM720T and ARM920T with MMU function.But ARM7TDMI has no MMU and doesn't support Windows CE and standard Linux.But μC/OS can be operated on ARM7TDMI hardware platform without needing operation system supported by MMU.In fact, μC/OS has been successfully implanted into many microprocessor platforms without MMU, and has advantages for stability.LPC2214 for the system is an ARM microprocessor without MMU and can operate μC/OS operation system, which meets the functional requirement of the system.