Design Of Portable Data Acquisition System Based On DSP

As one kind of tignum, concrete is widely used in infrastructure construction in our country. The research of the concrete crack resistance is urgent need, which was due to the common existing of concrete structure crack. Deep research of the concrete crack resistance can get the quantitative evaluation of the concrete crack resistance performance; provide accurate instruction for the design of concrete construction and reliable basis for raw material selection with the mixture ratio.This dissertation is a separation problem of temperature & humidity control system in temperature-stress testing machine. Based on the investigation and study, key questions of current portable data acquisition system are analyzed. Combining with main function of target system, technology of USB with protocol in version 2.0 is adopted as interface bus of data acquisition system, the system structure and software framework are designed. Hardware and software design of portable data acquisition system based on DSP are completed. The detail of dissertation reads as follows.Hardware design of portable data acquisition system based on DSP is the focal point in dissertation, which is composed of three sections, data acquisition module, digital signal processing module and USB interface module. The isolation, amplification and acquisition of analog signals are completed in data acquisition module; 16-channal analog signals are sampled by four pieces of Analog-to-Digital Converter then transmitted to data bus in data acquisition card. Memory expansion and electrify bootstrap of DSP, serial interface communication with PC are completed in digital signal processing module, finally, processed data are transmitted to PC with USB.Three sections of Firmware program, USB system drive and application program are included in software design of portable data acquisition system based on DSP. In addition, USB system drive is separated into USB client drive, USB equipment drive and USB host control drive. There are corresponding subroutine drives in hardware functional module. According to software functional partitioning realized data communication with upper machine in USB host application program.