Data Acquisition And Digital Filter Design Based On TMS320F2812

With the rapid development of information science , data acquisition and processing become a important technology of the computer application , mainly study the collection , storage and processing of information data . The appearance of DSP chip makes the arithmetic of digital signal processing come true .DSP becomes the preferred utility for realizing digital arithmetic rapidly and precisely relying on its particular hardware and instruction architecture .The structure of the DSP chip is Harvard DSP are getting more and more attentions in the information field , due to its powerful signal Processing ability , becoming a hotspot in communication and other correlative signal processing fields .This paper mainly study the realization of data acquisition and digital filter , Which is based on digital signal processor TMS320F2812 of TI company .First introduced the structure and characteristics of TMS320F2812 , the hardware design and software programming of the data acquisition system , The realization of data acquisition and digital filtering in the system are analyzed indetail .In the data acquisition part , we use the 12-bit ADC of the chip to collect data .The acquisited data is storaged in the chip's memory temporarily , then it is filtered and translated with FFT .The Processed data is transmitted to PC , then the PC will storage the acquisited data in document form .In this paper , we give the way of setting A/D Sampling rate,the Whole A/D program process and the method of configuring .cmd document .We also analyse and discuss the cause of acquisition error , and give the way to improve sampling precision .In the part of digital filter design , we adopt two design ways , the one is traditional which add coefficients from matlab to the CCS project of filter which has been built , the other one uses both matlab and CCS to create the project of filter automatically .We detailedly introduce some ways of designing FIR filter with matlab and the way of using fdatool to design various filters .The graph way which establishes digital signal processing model to reslize DSP design and simulation confirmation through the MATLAB/SIMULINK , and then transform the graphic file .mdl to the C language program running in CCS directly is also given .We use design tool of MATLAB to shorten the cycle of the product development , which is much more convenience than programming in CCS directly.