The Research And Design On Embedded Virtual Oscilloscope

With the rapid development of computer technology,Computer Virtual Technology become more and more important in the application of electronic measuring instruments., because traditional oscilloscope is low sensitivity and poor scalability, is hard to meet the demand of measuring technology development, however, The emergence and development of virtual instrument technology which solves the above problems show great market value and wide application prospect.The paper first discusses the design and realization of embedded virtual oscilloscope,including principle introduction, software design and hardware design, In hardware design, taking MSP430F247single chip as core, make full use of microcontroller with A/D conversion function, serial transmission module interrupt, timer functions, and the cost is small. In software design, Transplant real time operating systemμC/OS-II to microcontroller. The system based on multitask develop mode to improves reliability of system, development efficiency and shorten development period. Design break stack structure to maintain low-power and real-time of microcontroller, reduce space occupied of RTOS running in RAM. In serial data transmission and display module, transmit data contain keyboard instruction data and sample data. In waveform real-time data acquisition,using sliding window technique, sender and receiver have a continuous send frame number and receive frame number, when send frame number and receive frame number match, transmission successfully. In whole software design , adopt modular programming, detailed description programming thought and realizing way, presents design flow chart and key subfuction and source program.Finally, test and analyze results of virtual oscilloscope in the VC++environment, Througth microcontroller to gather input voltage signal, input signals waveform were displayed by using soft-panel function of Virtual oscilloscope. The whole system design have the characteristics of low-power, high accuracy and high performance price ratio, simple structure, easy to implement and so on.