Data Acquisition And Research On FFT Based On TMS320F2812

Data acquisition and processing become an important technology of computer application, which mainly studys the collection, storage and processing of information data. Technique of data acquisition and processing is widely applied in industry control system. Discrete Fourier Transform is one of the main tools in digital signal processing field. But because of its large computational complexity, its application is limited. Afterward, with the appearance of Fast Fourier Transform, DFT is widely used in practical application. Because most chips of DSP can complete a multiplication and an addition in an instruction period, and they can provide the specialized instruction of FFT, it accelerates the speed of the FFT algotithm working on the chip of DSP.The dissertation takes the 32 bits fixed-point digital signal processing processor TMS320F2812 of Texa Instrument Company as the core of signal acquisition and processing system. The data acquisition is completed by the 12 bits A/D convertor of TMS320F2812.and then do the signal processing on collected data. This dissertation points out the periphery circuit of data acquisition system. It compiles the procedures related to data acquisition system including main program of sampling, procedure of capture interrupt, program of ADC conversion sign-off interrupt, procedure of frequency measurement with the use of capture units and so on.Based on the introductions of DSP principle, chip resources of TMS320F2812 and Code Composer Studio (CCS) of TMS320, the dissertation describes and analyses the acquisition module and sampling theory of data and the achievement of Fast Fourier Transform on TMS320F2812 in great detail. It also works on the application in data acquisition system of FFT which is the most classical application in digital signal processing. Furthermore, this dissertation studies the theoretical research on how to reduce the storage units of RAM and ROM which are occupied by twiddle factors on the base of radix-2 FFT algorithm and puts forward a feasible plan. At last it carries out the software simulation in CCS using the acquired data.