Data processing this article details about is based on the fixed-point DSP--TMS320F206PZ, TMS320F206 of the United States Texas Instruments (TI) handle the speed very quick. This example demands much for precisions of sampling, precisions and speed of data processing, so we adopt the fixed-point DSP slice. In order to adapt to requirements of high-speed data transmission and processing, we would rather use ADS7805,which is high-quality parallel output A/D converter of BB company, not common-used 16-bits serial one, for which is difficult to connect with parallel buses and is slow to read data, all of these cannot satisfy high requests of sampling frequency. In computers' applying systems, it always exists contradictions of speed-mismatching between computer and external equipment, which largely give discount to efficiency. Interruption technology once well solved this kind of problem, but it should interrupt once for every data processing, which greatly reduce the system speed. The article adopt dual-port SRAM as data buffer.we use two ADS7805 to sample the current and the voltage, after which,we operate data filtering by fixed-point DSP, then store results in one of two ports, and lastly let the upper-level system take away results by another port. The emphasis and difficult point of this paper is the design of hardware circuit and the research of filtering algorithm, which should contributes much to investgations of controlling system and applications of DSP.
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