The Research And Design Of Digital Storage Oscilloscope Based On CPLD And MCU

Oscilloscope in the development of today are already quite mature, As a good helper for the teachers and engineers, the oscilloscope is widely used in the area of electronic measuring for teaching and scientific research. The digital storage oscilloscope based on SCM and the CPLD, is a low-cost digital oscilloscope technology, and is simple, integrated, easy-to-use advantages of flexibility, especially for universities, research institutes and the teaching of measurement applications. Today, the traditional oscilloscopes has been very popular, it is also very much in line with the cost of traditional oscilloscope to the needs of digital transformation。Based on this, I will study and research of the digital oscilloscope and tectonic theory, complete the design and implementation of hardware and software part of a digital oscilloscope based on the completion of a microcontroller and CPLD technology.In this paper, the basic concepts and principles of the digital storage oscilloscope is introduced, and describes the design and implementation of a low-cost digital storage oscilloscope (DSO) hardware and software part based on MCU and CPLD technology. The DSO has dual-channel analog input and storage, relatively high sampling rate, observing the larger bandwidth, storage depth of 3Kbits, recording time up to 8 milliseconds, and analog-digital conversion resolution of eight.Its major hardware includes some of the AD converters, buffer logic, and memory and control logic components. The control logic devices is designed and implemented on CPLD. CPLD used to design the hardware system more flexible and could be improved。This DSO system with advanced trigger mode (such as pre-trigger), and choose the sampling rate, allowing the system to diversity, user-friendly and has better practicality.The SCM software in some of its keil uVision integrated development environment using the C language, CPLD part in the Quartus II software development environment using VHDL language.They combined with each other, completed the acquisition of reading the data signals and display, keyboard users and can be achieved through the control of the DSO.