基于VxWorks的多中断处理设计

考虑VxWorks的中断在具体实现上的特殊性,提出一个针对多块采集板系统的中断设计方案,把传统的中断服务程序分解为中断服务程序和中断服务任务,利用信号灯进行同步,通过在中断服务任务中引入用户定义的优先级,增强系统处理多中断时的可靠性和实时性。

实时测量系统中一种通用型多中断源快速处理方法

一、引言 现代控制与检测技术需要用计算机的中断技术对被测量信号进行实时处理。中断方式是提高CPU效率、实现实时响应的一种处理方式。

实时测控系统中的多中断管理

给出了用八位微处理器构成测控系统中多中断扩充的方法,叙述了8214、8259的具体应用。介绍了基于PC机的测控系统中进行多中断管理的实现办法,用C++给出相关程序。总结了多中断管理的技术要点。

TMS320F24x的实时多中断任务处理

TMS320F240是TI公司定点DSP芯片F24x系列中具有代表性的一种。在分析其多中断源共享DSP内核同一中断级原理的基础上,探讨该系列芯片在实时多中断任务处理的软件编程过程中的实现方法,并给出具体的应用实例。

Proteus仿真图表在单片机多中断源运行中的应用

针对单片机多中断源电路运行过程中出现的异常状态多、调试分析难度大等问题,在Proteus平台下设计了由AT89C51单片机、多中断源申请电路、中断过程指示电路和串行口数据传输电路组成的多中断源电路,使用Proteus中提供的激励源模拟按键中断申请操作,实现图表的交互式仿真,借助仿真图表对单片机查询优先级和执行优先级的中断处理过程进行了详细的分析。实验结果表明,所设计的中断源电路可实时观察到多个中断源作用下的动态执行过程,将抽象的多中断源中断过程直观化、形象化,有助于分析调试过程中出现的问题,对实际应用具有一定的参考价值。

基于PCI总线多中断源机制的图像采集系统的实现

基于中断方式的图像采集是图像处理软、硬件开发的一个技术难点,通常也是目标跟踪项目要求的一个关键技术指标。根据实际工程项目的需要,利用S5933硬件中断资源,设计、开发了基于PCI总线的图像采集卡,在Windows操作系统下,成功地解决了基于中断方式的图像采集问题,并给出了PCI总线异步、同步方式下图像数据传输的实验测试结果。

多中断源快速处理方法与接口

本文提出了“直接跳入浮动中断矢量法”，研制出通用型多中断源快速处理接口，解决了多中断源响应和处理速度的矛盾以及通用性问题。实现了计算机在线位移精密测量的动态、实时和多参数的监控。

基于Proteus的单片机多中断源电路的设计

以单片机处理多中断源请求中断为例,对多中断源共同作用下的单片机处理过程进行了分析,在Proteus仿真平台下完成了电路的设计、程序编写和软硬件协同调试,采用按键模拟多中断源请求信号并进行控制,借助逻辑分析仪和CPU寄存器窗口对查询优先级和物理优先级设置下的中断过程进行了详细的分析。研究结果表明,使用Proteus软件可对单片机多中断源电路进行动态实时分析,将抽象的中断过程直观地展现出来,帮助发现多中断源调试过程中存在的隐蔽性、偶发性问题,提升解决问题的能力。

高速低耗的双串口多中断单片机

单片机的体积小,功耗低,功能强大,技术成熟,诸多优点使得各种类型的单片机在人类生产、生活中日益发挥着越来越重要的作用.目前,最常用的单片机莫过于Intel公司开发生产的80C51(89C51)系列,这一系列的单片机因为结构简单,价格低廉,容易开发,历来都是生产、教学的入门级芯片.但是随着控制技术尤其是嵌入式系统的发展,80C51、80C32系列在很多方面已经显得力不从心,越来越不能满足我们开发产品或控制的要求了.

MCS—51单片机的多中断设计

MCS—51系列单片机,指令丰富,配置灵活,在工业控制中得到了越来越广泛的应用。但一般它只提供两个外部中断源输入,因而,在要求有多个中断源输入,而且定时/计数等中断又另有它用的情况下,给使用者带来一定困难。笔者结合自己的实际经验,设计了一种软、硬件配合,简单可行的扩充外部中断源输入的多中断设计。使这一问题得到很好的解决。

嵌入式实时系统中断管理技术研究

嵌入式实时系统中断管理技术直接影响到系统的实时响应性能。本文通过对嵌入式内核中断管理技术的研究,归结出“中断前-后段处理”模型;同时,针对一些处理器中多个外部中断共用一个向量的问题,提出一种单向量多中断处理映射技术,并在PowerPCMPC860处理器上实现DeltaOS内核时,验证此技术的有效性。

中断相互嵌套方法的研究

描述了一些多中断源相互中断的技巧,并已被成功地用在实时微机系统,如Z80、MCS-51和可编程中断控制器Intel 8259A。

模块化嵌入式五指机器人灵巧手手指控制系统

为开发高度集成的五指机器人灵巧手,提出了采用DSP(Digital Signal Processor)+FPGA(Field Programmable Gate Array)控制结构的模块化嵌入式手指控制系统设计方法。实现了采用单电流传感器检测全桥控制下相电流及相电流过流双保护。为解决手指DSP和FPGA之间如何稳定、高效通信的难题,结合先进先出FIFO(First In First Out)寄存器,设计了基于串行通信接口SCI(Serial Communications Interface)和RS485总线的多中断差分通信系统。实验证明,这种DSP+FPGA控制结构及模块化的设计,使得手指控制部分得以高度集成,同时DLR/HITII灵巧手获得很好的整体性能和稳定性。

Multitask Data Processing in a Wireless Alarm System

Aim To achieve multitask data procssing in a wireless alarm system by computer. Methods The alarm system was composed of hardware and software. The hardware was composed of a master master computer and slave transmitters. On urgent ugent occasion, one or more of the transmitters transmitted alarm signals and the master computer received the signals; interruption, residence, graph and word processing were utilized in software to achieve multitiask data processing . Results The main computer can conduct precise and quick multitask data procesing in any condition so long as alarm signals are received. The processing speed is higher than ordinary alarm System. Conclusion The master computer can conduct safe and quick multitask data processing by way of reliable design of software and hardware , so there is no need of special processor.

Effects of growth interruption on the properties of InGaN/GaN MQWs grown by MOCVD

InGaN/GaN MQWs structures were grown by MOCVD. The effects of the growth interruption time on the optical and structural properties of InGaN/GaN MQWs were investigated. The experimental results show that the growth interruption can improve the interface quality, increase the intensity of photoluminescence (PL) and electroluminescence (EL); but if the interruption time was too long, the well thickness and the average In composition of MQWs decreased, and the EL intensity also decreased due to poor interface quality and impurities derived from growth interruption.

Joint multi-user space time block coding and beamforming via convolutional weighting

A convolutional weighting （CW） scheme applied to a half-wavelength spacing array was proposed for multi-user system to joint STBC （space time block ceding） and beam forming （BF）. The transmitting beam is equivalent to the product of two sub-beams. One is used to realize interference suppression, while the other is employed to form a couple of uncorrelated channels from base station （BS） to the desited user （to meet the requirement of STBC） and to maximize SINR （signal-to-interference-plus noise ratio） at the desired receiver. As an optimum combination of STBC and beam forming, the proposed scheme can achieve both full diversity order of STBC and array gain of BF. Meanwhile, it can also effec- tively restrain multi-user interference by nulling. Simulation results show that the proposed scheme can significantly improve the BER （Bit Error Rate） performance and enhance system capacity as compared with the conventional eigen-beamforming （EBF） technique applied to a half-wavelength spacing array.

Diversity and Geographical Pattern of Altitudinal Belts in the Hengduan Mountains in China

This paper analyses the diversity and spatial pattern of the altitudinal belts in the Hengduan Mountains in China. A total of 7 types of base belts and 26 types of altitudinal belts are identified in the study region. The main altitudinal belt lines, such as forest line, the upper limit of dark coniferous forest and snow line, have similar latitudinal and longitudinal spatial patterns, namely, arched quadratic curve model with latitudes and concave quadratic curve model along longitudinal direction. These patterns can be together ealled as ＂Hyperbolic-paraboloid model＂, revealing the complexity and speciality of the environment and ecology in the study region. This result further validates the hypnosis of a common quadratic model for spatial pattern of mountain altitudinal belts proposed by the authors. The spatial pattern of altitudinal belts is closely related with moisture-related exposure effect in the Hengduan Mountains. Different combinations （spectra） of altitudinal belts and different base belt types appear in windward and leeward flanks and even in the same flanks of different ranges. This is closely related with the parallel mountain ranges of the Hengduan Mountains, which, at nearly right angle with the moving direction of prevailing moisture-laden air masses from west and east, hold up the warm and humid monsoon wind from moving into the core region and result in different moisture conditions in windward and leeward flanks. However, how to quantitatively describe the moisture-related exposure effect needs further study. In addition, the data quality and data accuracy at present also affect to some extent the result of quantitative modeling and should be improved with RS/GIS in the future.

Excision of a large abdominal wall lipoma improved bowel passage in a Proteus syndrome patient

Proteus syndrome is an extremely rare congenital disorder that produces multifocal overgrowth of tissue. This report presents a surgical case of a large lipoma in the abdominal wall of a patient with Proteus syndrome. She was diagnosed with Proteus syndrome based on certain diagnostic criteria. The neoplasm increased in size gradually, producing hemihypertrophy of her left lower extremity and trunk, and spread to her retroperitoneum and her left abdominal wall. She experienced gradually progressive constipation, nausea, vomiting, and abdominal pain. Computed tomography （CT） of the abdomen demonstrated a large mass in the subcutaneous adipose tissue of the left lower abdominal wall which measured 12 cm×8 cm×6 cm in diameter and encased the left colon. This mass in the abdominal wall was excised. The weight of the excised mass was 1550 g. The histopathological diagnosis of this mass was lipoma. After surgery, the encasement of the left colon was improved, and the patient was able to move her bowels twice per day. The excision of the large lipoma in the abdominal wall contributed to the improved bowel passage in this patient with Proteus syndrome.

Outage Probability of Composite Microscopic and Macroscopic Diversity over Correlated Shadowed Fading Channels

The outage probability of a composite microscopic and macroscopic diversity system is evaluated over correlated shadowed fading channels.The correlations on both a microlevel and macrolevel are taken into account for the evaluations.The expression of the desired outage probability is explicitly presented,and two evaluation approaches,i.e.a compact Gaussian-Hermite quadrature method and an effective iterative algorithm,are proposed.The accuracy and efficiency of the proposed approaches are analysed,and a guideline is provided for their application.By employing the proposed evaluation approaches,results and demonstrations are presented,which display the implied effects of the corresponding parameters on the system outage performance,and reveal the potential to facilitate the design and analysis of such composite diversity systems.

Review of the diagnosis and clinical features of multiple sclerosis in China

This review focused on the diagnosis and clinical features of multiple sclerosis(MS) in China. We have identified the published researching information from 1976 to 2008 in China. The key issues related to the diagnosis and clinical features of MS in China were summarized. The first patient with MS in China was reported in 1926 from Xiehe hospital. Case reports on MS has been increasing during recent decades. Almost all the patients with MS were confirmed by the McDonald criteria(1977) before1984. After the...