The Design Of USB Interface Virtual Instrument Based On GPIF Mode

The virtual instrument based on USB interface developed rapidly in virtual instrument, it is low-cost-based virtual instrument development. In this paper, this virtual instrument achieved a high-speed data acquisition and waveform signal function.Our design of the virtual instrument is GPIF technology and CyAPI library. GPIF mode makes the system available to the largest data transfer, CyAPI library design methodology shorten the software design time and improve the efficiency of the implementation of the software.About application, the following 4 was finshed.1.the design of a virtual instrument connected to the USB hardware.2 USB firmware used GPIF model was completed.3 the design of data acquisition and waveform signal PC visualization software program was completed.4 USB driver was completed, so it is a plug-and-play virtual instruments.Final, after the finish of the design, the functions are proved in good condition.