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嵌入式系统中函数发生器用户图形界面的实现 总被引:1,自引:0,他引:1
在嵌入式系统中实现用户图形化(GUI)已经成为一种趋势.本文简要介绍了应用在函数/任意波形发生器上的GU的实现,重点分析了GUI的设计思路,并简单介绍了基于Visual DSP 4.0 Kernel(VDK)用户界面实现原理以及用户界面软件设计结构和流程.实验表明,该设计能够满足客户目前及未来测试需求的多用途解决方案.实现结果表明,该设计方案合理、可靠,并具有十分方便的用户可操作性. 相似文献
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介绍了ADI公司的实时操作系统内核VDK的特点,及其应用在红外目标检测跟踪系统中的优点。详细讨论了目标检测跟踪系统的进程划分与设计,输入输出设备的驱动程序设计,进程间的通信方法等。实践证明,该设计方法不仅确保了实时性要求,提高了开发效率,而且使系统的升级和维护更为简单。 相似文献
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双乙酰是啤酒发酵过程中酵母自身代谢产生的一种副产物,其含量是衡量啤酒成熟的主要指标。双乙酰含量的传统检测方法(VDK检测方法)存在一定的缺陷,而总双乙酰(TVDK)是双乙酰及其前驱体的总和,用TVDK来评价啤酒的成熟度具有正确的指导价值。本试验通过验证VDK检测方法中存在的缺陷,得出TVDK方法的可行性,并且研究了不同浓度啤酒发酵过程中TVDK的变化规律,通过阈值试验得出TVDK在啤酒发酵成熟评价中的控制标准为0.10 mg/L。试验提出了测定啤酒中总双乙酰的可行性方法,对保证啤酒的正常发酵起到了一定作用。 相似文献
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The vicinal diketones (VDK), such as diacetyl and 2,3‐pentandione, impart an unpleasant butter‐like flavour to beer. Typically, these are required to be reduced below the flavour thresholds during the maturation (lagering) stages of the brewing process. To shorten beer maturation time, we constructed a self‐cloning, bottom‐fermenting yeast with low VDK production by integrating ILV5, a gene encoding a protein that metabolizes α‐acetolactate and α‐aceto‐α‐hydroxybutyrate (precursors of VDK). A DNA fragment containing Saccharomyces cerevisiae‐type ILV5 was inserted upstream of S. cerevisiae‐type ILV2 in bottom‐fermenting yeast to construct self‐cloning strains with an increased copy number of ILV5. Via transformation, ILV2 was replaced with the sulfometuron methyl (SM) resistance gene SMR1B, which differs by a single nucleotide, to create SM‐resistant transformants. The wort fermentation test, using the SC‐ILV5‐homo inserted transformant, confirmed a consecutive reduction in VDK and a shortening period during which VDK was reduced to within the threshold. The concentrations of ethyl acetate, isoamyl acetate, isoamyl alcohol, 1‐propanol, isobutyl alcohol and active isoamyl alcohol (flavour components) were not changed when compared with the parent strain. We successfully constructed self‐cloning brewer's yeast in which SC‐ILV5 was homo‐inserted. Using the transformed yeast, the concentration of VDK in fermenting wort was reduced, whereas the concentrations of flavour components were not affected. This genetically stable, low VDK‐producing, self‐cloning bottom‐fermenting yeast would contribute to the shortening of beer maturation time without affecting important flavour components produced by brewer's yeast. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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基于ADSP—BF537的VDK/LwIP嵌入式实时操作系统设计与应用 总被引:1,自引:0,他引:1
Blackfin是AD公司和Intel公司共同开发的DSP,该器件采用了一种新型结构MSA。作为AD系列DSP软件开发环境VisuaJDSP的一个重要组成部分,VDK特别适用于开发需要精巧控制代码的系统。LwIP是用于嵌入式系统的轻量级开放源码TCP/IP协议栈。本文提出了一种在嵌入式DSP系统中实现以太网通讯的解决方案。该方案将AD公司的BF537与以太网接口芯片Lan91c11l相结合,并在DSP芯片上移植了VDK操作系统和LwIP轻型以太网协议栈.同时用软件方式实现了TCP/IP网络协议,从而达到嵌入式系统同Internet通信的目的。 相似文献
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作为AD系列DSP软件开发环境VisualDSP的一个重要组成部分,VDK特别适合用于开发需要精巧控制代码的系统。本文介绍了VDK的原理及基于他开发应用系统的优点。最后给出了一个基于VDK开发应用系统的简单例子. 相似文献