STM32的FatFS在数据采集系统中的应用

针对单片机大容量数据采集系统,设计了一种以STM32 F107微控制器为核心,以大容量SD卡为存储介质的数据采集系统。简述了开源的FatFS文件系统在STM32处理器上的移植及其底层驱动函数的编写,利用24位∑Δ模/数转换器实现了高精度数据采集,利用FatFS文件系统实现了采集数据的大容量存储和管理,为数据后续处理和传输提供了便利。     

雷达数据采集回放系统的设计与实现

为满足雷达数据采集需求,设计一个12×10Mb/s基于PCI9054的数据采集系统。该系统能够实现持续数据率大于100Mb/s的雷达数据连续高速实时采集与存储,可编程逻辑器件控制数据的采集、存储与传输,实际工程验证表明该数据采集系统满足工程应用需要。     

基于FPGA的大容量数据高速采集系统的设计

介绍了一种基于DDR2 SDRAM与USB 2.0接口的大容量数据高速采集系统,该系统以FPGA为控制核心;利用FPGA的内部模块化的编程、DDR2 SDRAM的大容量存储以及USB 2.0接口的高速传输能力实现了数据的高速采集、大容量存储和传输;该系统支持热插拨和即插即用,使用方便;实验结果表明该系统可以实时高速的进行数据采集、存储和传输,最高传输速率可达20 MByte/s;在信号的高速采集领域有着很高的应用价值。     

基于ARM与FPGA图像采集存储系统设计

设计实现了一种基于ARM与FPGA高速图像采集存储系统.该系统采用视频编码芯片SAA7113和FPGA实现高速视频采集,采集数据经由ARM处理器读取并存储到大容量硬盘存储器,为数字图像的后续处理提供了可能.     

基于ARM与SD卡的嵌入式存储系统研究与设计

随着计算机硬件的发展及数据量的增加，对存储设备的要求也越来越高，SD卡是近年来流行的大容量便携式存储卡。该文介绍了一种在ARM9处理器At91RM9200基础上，以SD卡作为主要存储介质的数据存储系统。描述了SD卡与At91RM9200的硬件接口，对SD卡文件系统与Lirnux下驱动程序实现进行了详细说明，最后介绍了Linuxi设备驱动模块的加载。     

基于S3C2440和AD9248的高速采集系统的设计

设计了一个利用高速A/D、FIFO以及ARM9实现的高速数据采集系统.通过ARM9控制高速A/D转换和FIFO的读写,并采用大容量的板载数据存储器,可以实现较长时间的连续采集.设计了网络接口和USB接口实现数据的保存和传输,并设计了GPS授时模块接口以实现多个站点的同时数据采集.     

超高速数据采集系统设计与优化策略研究

为满足雷达信号高速采集实时存储的需求,设计了一个12 bit、200 MS/s的高速采集存储系统。基于CPCI总线解决高速数据传输的需求,并利用雷达信号的特点,提出了采样时间窗的概念,有效降低了采集数据量和数据传输压力。设计了一种二级缓存机制以提高DMA传输效率,并通过数据格式的组合来匹配总线宽度,提高CPCI总线带宽利用率。采用千兆以太网磁盘阵列,解决了海量数据的高速存储问题。系统最终实现的采样速率是200 MS/s,量化精度12 bit,连续采集。     

8位CPU总线采样记录仪的设计

设计了一种8位CPU总线采样记录仪,对51单片机总线进行采样,从中提取如下4种信息并存储：片外程序代码和地址、片外数据存储器的数据和地址。它基于Altera公司提供的DE0开发板,外接AT89S52单片机最小系统,带触摸LCD和SD卡,在FPGA内实现总线采集模块,共同构建了一个SOPC系统,通过在Nios II中运行的软件对数据进行存储、处理。测试结果表明,采集的数据可使用TXT文件的格式存放在SD卡上,同时可在液晶屏上显示和查找。     

超高速多通道瞬态测试系统软硬件设计技术研究

介绍采样频率为2~10 MHz的64通道超高速同步瞬态测试系统的设计技术,主要包括超高速瞬态测试系统的两类硬件架构设计及其软件架构设计;详细讲述基于PXI Express总线传输和高速RAID阵列数据持续流盘存储与基于大容量板载数据缓存和总线下载传输的测试系统硬件架构,并应用生产者/消费者结构与有限状态机结合的软件架构进行高性能测试系统软件设计;针对数十GByte海量测试数据的存储、回调编程以及多通道波形显示等系统软件设计关键技术问题提出解决方案;基于上述技术方案,设计了256 MB/s流盘速度连续采集时间达5min以上的同步流盘测试系统以及10MHz/Ch持续时间6.4s的64通道超高速瞬态测试,满足瞬态测试的各种应用。     

基于MinGUI 和SD 卡FAT32 文件系统的数据采集显示终端

详细介绍了一种基于MinGUI和SD卡FAT32文件系统的数据采集显示终端的设计与实现。采用SEP4020作为微处理器,配有AD数据采集模块、TFT液晶屏图形界面显示模块和SD卡数据存储/读写模块等,并利用μC/OS-II嵌入式操作系统管理任务之间的切换与通信。该系统实现了对模拟信号和数字信号的采集,在显示终端上进行实时显示和触摸屏操作控制,并将数据存储在SD卡中供上位机做进一步数据分析等功能。     

Assessing Ideational and Evaluative Skills and Creative Styles and Attitudes

This article describes the rationale for the multiphase creative problem solving process, and reports the findings from an empirical investigation conducted to facilitate the problem solving of managers. The ideational skills of the managers were assessed before and after training in a complete process of creative problem solving, along with their ideational attitudes, creative problem solving style (i.e., generator, conceptualizer, optimizer, or implementor), and evaluative skill (i.e., ability to recognize original ideas). The most important findings indicated that the training had a significant impact on the evaluative accuracy of the managers. They were significantly more accurate in their judgments about original ideas after training, both in their identification of original ideas and their recognition of unoriginal ideas. After training, the managers also gave more solutions and more original solutions to problems. Finally, several variables (e.g., the “preference for active divergence” attitude, and the conceptualizer process style) seemed to moderate the impact of training. Training was therefore effective, with specific effects that can be predicted from pre-training individual differences in attitudes and process style.     

Semantics and verification of monitors and systems of monitors and processes

In this paper we present a sound and complete semantics for the monitor concept of C.A.R. Hoare. First a method for specification of monitors, introduced by O.-J. Dahl, is reviewed. This method is based on the relation between the historic sequence of monitor procedure calls and the historic sequence of monitor procedure exits. Based on such specifications and our new monitor semantics we present a method by which it is possible to prove that a concrete monitor is an implementation of an abstract one. In the last part of the paper an axiomatic semantics for systems of concurrent processes and monitors is introduced. The method supports verification by separation of concerns: Properties of the communication to and from each process are proven in isolation by a usual Hoare style axiomatic semantics, while abstract monitors are also specified in isolation by the method reviewed in the first part of the paper. These properties of the components of the system are then used in a new proof rule to conclude properties of the complete system. Stein Gjessing received a Ph.D. (actually a Dr. philos.) from the University of Oslo (Norway) in 1985. Presently he is an Associate Professor at the Institute of informatics, University of Oslo, Norway. Dr. Gjessings research interests are in the area of concurrent and distributed programming, operating systems, formal specification and verification and programming languages.     

Integrating and automating analysis and optimization

The development of an interface coupling program on personal computers for an analysis software system such as ANSYS, SAP, etc. and an optimization software system, MOST, is presented. By controlling and directing the communications the interface coupler integrates the two programs while retaining their versatility and interactive features. The integrated system is used to solve a numerical example of active noise control for a three-dimensional enclosure, in which an energy density level of control points is minimized by adding the sound source to cancel the unwanted noise. The interface coupling program automates with relatively low cost the iterative process for designing an engineering system, remaining flexible in acoustical modelling and efficient in equation solving. Also, the coupling interface is developed in a general-purpose way so that it can be expanded easily to integrate more analysis software packages of different kinds.     

Rank and select revisited and extended

The deep connection between the Burrows–Wheeler transform (BWT) and the so-called rank and select data structures for symbol sequences is the basis of most successful approaches to compressed text indexing. Rank of a symbol at a given position equals the number of times the symbol appears in the corresponding prefix of the sequence. Select is the inverse, retrieving the positions of the symbol occurrences. It has been shown that improvements to rank/select algorithms, in combination with the BWT, turn into improved compressed text indexes.