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提出一种基于嵌入式Linux的矩阵键盘实现方案,介绍矩阵式键盘的结构与工作原理。课题以IntelPXA255处理器和嵌入式Linux 2.4.19操作系统为基础,对人机交互接口设备驱动程序的设计开发做了深入的研究,针对嵌入式系统的键盘驱动的特点,设计基于行列扫描的键盘驱动程序。 相似文献
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介绍了嵌入式Linux移植的方法和过程。给出了嵌入式开发环境下基于硬件平台ARM9的bootloader、Linux内核移植的实现方案.该方案可为嵌入式系统的应用研究提供操作系统层面的支持。 相似文献
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介绍一种在嵌入式Linux环境下实现USB摄像头驱动的方法,它采用具有USB Host协议的接口芯片ISP1161,通过分析Linux设备驱动原理以及ISP1161和USB摄像头芯片组工作机制,实现了USB摄像头的嵌入式Linux设备驱动,并在基于IntelXscale PXA255的Sitsang平台上实现了基于USB等时传输模式的图像数据采集. 相似文献
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对基于ARM的网络设备驱动程序的开发进行了研究,对嵌入式Linux网络设备驱动程序的运行机制进行了分析,介绍了一般网络设备的体系结构,对网络驱动的主要功能进行讲述。在嵌入式Linux中实现CS8900A网卡驱动,并结合实现CS8900A网卡驱动的实例讲解了基于Linux操作系统的一般网络驱动程序的开发流程。并具体分析了网络设备的初始化、设备的打开与关闭、数据的发送与接收以及中断处理等相关问题。最后在Linux平台编译运行且通过测试。 相似文献
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介绍了嵌入式系统的概念和Linux系统的嵌入式特性,分析了嵌入式Linux系统的开发流程、工具链、内核移植和文件系统的设计,并从系统启动、体积和内存占有率等方面着手,讨论了嵌入式Linux系统的优化方案。该设计在国家体育总局的嵌入式计时产品中得到应用,提高了系统的稳定性、响应速度和运行效率。 相似文献
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基于软/硬件协同设计的嵌入式系统的性能测试 总被引:1,自引:0,他引:1
本文首先分析了传统的嵌入式系统设计方法及目前流行的软硬件协同设计的方法,指出软硬件协同设计方法是嵌入式领域的一个研究热点,接着分析了传统的测试方式的缺点,然后介绍了AMC公司的CodeTEST嵌入式软件在线分析与测试解决方案,同时也简要介绍了其它几种嵌入式测试工具。 相似文献
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以AlteraFPGA系列CycloneEPlCl2Q240C8器件为载体,通过SoPC技术构建嵌入式软核NiosⅡ处理器平台,运用VerilogHDL硬件描述语言设计等精度测量载波频率IP核、红外信号解调IP核、红外编码脉宽测量IP核和红外发送调制逻辑电路,以实现载波的精确测量、红外信号解调、脉宽测量和调制功能,并给出了外围硬件电路和软件设计方案。实验表明,该遥控器解决了单片机因时钟频率低而无法对载波频率进行测量的瓶颈,实现了对任何一款普通遥控器的按键编码学习,真正完成了学习型遥控器的学习功能。 相似文献
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A multi-layer authentication scheme for HEVC compressed video is proposed. The combination of CU sizes, which is unique to HEVC and sensitive to video manipulation, is considered along with other elements in the HEVC coding standard to generate the authentication tag. Temporal dependency was enforced, where the authentication tag generated in one slice is embedded into its subsequent slice. By design, the authentication tag is repeatedly but selectively embedded into various elements in a HEVC video, including nonzero DCT coefficients, QP parameter values, and prediction modes, depending on the bit segment in the generated tag. Our scheme offers three layers of authentication to detect and localize the tampered regions in a HEVC video, as well as verifying the source/sender of the video using a shared secret key. Video sequences from various classes (resolutions) are considered to verify the performance of the proposed multi-layer authentication scheme. Results show that, at the expense of slight degradation in perceptual quality, the proposed scheme is robust against several common attacks. A functional comparison is performed between the proposed multi-layer authentication scheme and the conventional schemes. 相似文献
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由于嵌入式平台的开放性和智能化,嵌入式数据库面临的安全威胁日益增长。在此提出一种嵌入式数据库安全增强方案,融合多种安全技术,如指纹识别、访问控制、数据加密等,设计了一种基于嵌入式数据库的安全中间件,构造访问嵌入式数据库的安全通道,对嵌入式数据库系统进行安全增强。该安全方案在嵌入式数据库Berkeley DB系统上得到了应用,验证了嵌入式数据库安全方案的可行性,能够有效地增强嵌入式数据库的安全性。 相似文献
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This work presents a secure and robust color image watermarking for copyright protection applications, that is based on exploiting the multi-spectral properties of the primary color components of the RGB image. The proposed scheme employs the interconnection between the subbands of the primary color components in the wavelet-packet domain. The scheme is constructed to be adaptive, in the sense that the watermark bits are embedded in safe locations, depending on the inter-layer energy of coefficients in the wavelet-packets. The scheme immunity to attacks is improved by applying a two-level security procedure. To validate the high performance of the proposed scheme, several experimental tests were conducted and a comparative analysis was provided. The obtained results have shown improved watermarking robustness against a wide range of attacks while preserving a high watermarking imperceptibility. 相似文献
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The paper proposes a new test data compression scheme for testing embedded cores with multiple scan chains. The new compression scheme allows broadcasting identical test data to several scan chains whenever the cells in the same depth are compatible for the current application test pattern. Thus, it efficiently utilizes the compatibility of the scan cells among the scan chain segments, increases test data run in broadcast mode and reduces test data volume and test application time effectively. It does not need complex compressing algorithm and costly hardware. Experimental results demonstrate the efficiency and versatility of the proposed method. 相似文献