The Development Of Multifunctional Measuring And Test Instrument Based On FPGA

Measuring and test instruments are widely used in the fields of national economy and national defense construction, and it is one of the vital and important equipments in scientific research and manufacturing. Its principle is that the signal generator sends excitation signal to the measured object, and at one time the data acquisition and processing equipment acquires the measured object's response signal via sensors and sends to PC for data processing and analysis. The paper studies the multifunctional measuring and test instrument, which utilizes flexible FPGA as the core of the instrument to harmonize the whole set's operation, uses advanced USB bus technology, and integrates signal generation and data acquisition into one whole.The first chapter of this thesis introduces the measuring and test instrument and its research and application status. Due to development that request of instrumental cost, portability and universality is steadily going up, we bring forward the project's research tasks and key technologies.The second chapter discusses the instrument's general design in two ways of hardware and software, and expends the hardware design of six modules, including power supply module, USB module, FPGA module, DSP module, A/D module and D/A module.The third chapter discusses the software design of USB module, and it contains USB firmware programming, USB drive programming and client application programming. We elaborate on the framework of the parts of software and realization of general function modules.The forth chapter investigates the design of main controller FPGA, and it is central to this paper. We introduce design scheme of FPGA in the mass, and then concretely describe the implementation of MCU module, data acquisition module and signal generation module. We adopt modularized design ideas in programming, and make software clear, more readable and easier to further develop. We also adopt finite-state machine and greatly increase the stability and efficiency of program.The fifth chapter introduces the design of DSP module, discusses the principle and realization of signal generation, and describes the interface of DSP and FPGA.The sixth chapter elaborates on steps and results of experiments. We conduct experiments at two aspects—single-channel data acquisition and multi-channel data acquisition, and validate instrument performance and design feasibility.