A Study Of Data Transimission And Processing Technology Based On High-Speed Network Interface With 96-channel Synchronous Data Acquisition System

With the development of measurement technology and embedded systems, the precision and rate of data acquisition systems are rising, along with the increasing demand of DAQ channels and the increasing quantities of data that produced. It has been more and more important to take an effective transmission and processing on the vast sample data.This paper comes from the project of 96-channel high-resolution data acquisition system, and this project includes two parts, one is the master control system, high –speed network interface and data transmission and processing, and the other part is a multi-channel synchronous sampling system. This article focus on the first part to design the hardware platform and software of an embedded system and it’s upper-computer program.This paper researched the system’s requirements and system key modules, demonstrates the overall plan, and expound the implementation process of the system’s hardware and software. On the hardware side, the embedded system platform based on AM3354 microprocessor, SD card read program, the console interface conversion, real-time clock, power supply and other assisted circuits are designed。After this, a cross-development environment were set up to develop embedded Linux programs.On the software side, the dividing of the system’s working stage and the design of the subprograms is based on the working process, meanwhile a storage format of the sampling task table and the sampling data are designed. And through the cooperating of the upper computer and the embedded system, a brunch of functions are accomplished, such as auto connection, task table sending and receive on the upper computer, analyzing and executing of the task table on the embedded system, reading SD card data in a EDMA way and data buffering, TCP/IP data transmission, receiving and storing data on the upper computer and so on. And after all the basic function of the system is completed.Finally, a functional test has been designed and tested, and a bunch of suggestions focus on system improving were proposed.