USB communication based modular function expansion method and system for digital oscilloscope

Abstract

The invention discloses a USB communication based modular function expansion method for a digital oscilloscope. The method comprises the following steps: (1) the digital oscilloscope and an external connection device are prearranged; (2) a supporting USB device interface and a USB device drive are arranged, and an identification code of the external connection device is preset; (3) a command and data are packaged; (4) initialization is performed, a USB event monitoring thread is established, and whether a USB accessing event or a USB pulling out event happens is judged; if the USB accessing event happens, the type of the external connection device is judged; if the USB pulling out event happens, the external connection device of which the USB is pulled out is interpreted, and a marker of the device is reset; (5) after the type external connection device is determined, the external connection device is initialized, and the marker of the external connection device is set, a host process judges the marker and jumps to a corresponding operation interface, and data are received and displayed; a USB transmission thread is established for receiving data and analyzing communication protocols, new setting is performed, and data are read; (6) whether new setting is performed is judged; (7) the data are uploaded. The invention further discloses a function expansion system.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method and system for expanding the modular function of a digital oscilloscope based on USB communication. Background technique [0002] A digital oscilloscope is a high-performance oscilloscope manufactured by a series of technologies such as data acquisition, A / D conversion, and software programming. Digital oscilloscopes generally support multi-level menus, which can provide users with multiple choices and multiple analysis functions. However, in the process of using the digital oscilloscope, it still requires the cooperation of other equipment, such as digital multimeter, logic analyzer and so on. [0003] At this stage, the connection method of using digital oscilloscope with other equipment is usually to directly connect other equipment to the digital oscilloscope. The digital oscilloscope and other equipment perform their original tasks, and there is no direct con...

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Problems solved by technology

[0003] At this stage, the connection method of using digital oscilloscope with other equipment is usually to directly connect other equipment to the digital oscilloscope. The digital oscilloscope and other equipment perform their original tasks, and there is no direct connection between them. The data cannot be directly displayed on the digital oscilloscope

This way of sampling a large integrated design requires the use of high-performance, multi-pin processors, which greatly increases the design cost, and there are not many choices, and the function matching is not flexible; It needs to be processed and analyzed separately, it is difficult to realize the automatic reception and interaction of data, and the degree of integration is low

[0004] At the same time, the conventional communication method between the digital oscilloscope and other devices is the serial port communication speed is slow, the interface size is large

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