| The acquisition and processing of signal are used widely in the fields of scientific research, industrial and so on. With the tested object more and more complex, high speed, high precise and powerful computing of the instrument is required. So, it is very significant to design a real time and high precise dynamic signal analyzer.In order to realize real-time data acquisition and transmission,USB2.0 is selected as a kind computer interface. In addition, USB interface has the advantages of hot plug and play, being easily extended and used. At present, many peripheral devices of computer use USB interface to accomplish data communication with computers.The scheme of dynamic signal analyzer which is based on USB2.0 is introduced in this paper. This system takes CY7C68013 as USB2.0 interface chip and fixed point DSP chip TMS320C6713 as main processor, making full use of high speed of chip CY7C68013 and abundant interface resource, powerful computing of DSP. It is be able to real-time data acquisition and processing, transmitting data to the computer to display and save. In addition, using McBSP of DSP to control D/AC to generate signals. Having competed the circuit designing for it according to the scheme of this system. In this paper, the author studied the USB protocol, developing the USB2.0 interface based on the chip CY7C68013, coding the Firmware and Application program. It realizes real-time data transmission between USB equiment and PC. And how to accelerate transmission rate of USB is discussed also. How the DSP control D/AC to generate signals is studied. Lastly, coding program of DSP in CCS and realizing the signal source. |
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