971/5000
使用通用媒体访问控制（MAC）规范和管理信息库（MIB），为从1 Mb / s到400 Gb / s的选定操作速度指定了以太网局域网操作。 带冲突检测的载波侦听多路访问（CSMA / CD）MAC协议指定了共享介质（半双工）操作以及全双工操作。 速度特定的媒体独立接口（MII）允许使用选定的物理层设备（PHY）通过同轴电缆，双绞线或光缆或电背板进行操作。 多段共享访问网络的系统注意事项描述了中继器的使用，这些中继器的定义是运行速度高达1000 Mb / s。 所有速度均支持局域网（LAN）操作。 其他指定的功能包括：接入网的各种PHY类型，适用于城域网应用的PHY，以及通过选定的双绞线PHY类型提供电源。
Ethernet local area network operation is specified for selected speeds of operation from 1 Mb/s to 400 Gb/s using a common media access control (MAC) specification and management information base (MIB). The Carrier Sense Multiple Access with Collision Detection (CSMA/CD) MAC protocol specifies shared medium (half duplex) operation, as well as full duplex operation. Speed specific Media Independent Interfaces (MIIs) allow use of selected Physical Layer devices (PHY) for operation over coaxial, twisted pair or fiber optic cables, or electrical backplanes. System considerations for multisegment shared access networks describe the use of Repeaters that are defined for operational speeds up to 1000 Mb/s. Local Area Network (LAN) operation is supported at all speeds. Other specified capabilities include: various PHY types for access networks, PHYs suitable for metropolitan area network applications, and the provision of power over selected twisted pair PHY types. (2020-09-11, LINUX, 40253KB, 下载20次)
1.摄像头通过V4L2采集yuyv格式图像数据 2.yuyv转yuv420p格式 3.yuv420p通过x264编码压缩为h264码流 4.将h264码流通过tcp传输到显示端 5.显示端接收h264码流，并保存为本地文件，程序运行结束后可通过VLC播放器直接打开xxxx.h264文件进行播放
1. Camera collects image data in Yuyv format by V4L2. Yuyv converts to Yuv420p format. Yuv420p is compressed into H264 stream by X264 encoding. 4. H264 stream is transmitted to display terminal through tcp. 5. Display terminal receives H264 stream and saves it as local file. After the program runs, xxx.h264 file can be directly opened by VLC player for playback. (2019-05-21, LINUX, 2420KB, 下载9次)
人类文明的进步都会打下时代的烙印，19世纪的煤炭和蒸汽机，20世纪的内燃机、石油和电力，到21世纪的信息化时代。我们正处于大数据变革的时代，移动互联网、智能终端、新型传感器渗透到地球的每一个角落，人人有终端(例如手机)、物物可传感、处处可上网、时时在链接。（造就国际"八大金刚"：IBM、谷歌、思科、高通、苹果、英特尔、甲骨文、微软）
The progress of human civilization will be marked by the times, coal and steam engines in the 19th century, internal combustion engines, oil and electricity in the 20th century, and information age in the 21st century. We are in the era of big data change. Mobile Internet, smart terminals and new sensors penetrate every corner of the earth. Everyone has terminals (such as mobile phones), things can be sensed, everywhere can access the Internet, and links at all times. (Bring up the International Eight Diamonds: IBM, Google, Cisco, Qualcomm, Apple, Intel, Oracle, Microsoft) (2018-12-01, LINUX, 25013KB, 下载3次)
CMake是一个跨平台的安装（编译）工具，可以用简单的语句来描述所有平台的安装(编译过程)。他能够输出各种各样的makefile或者project文件，能测试编译器所支持的C++特性,类似UNIX下的automake。只是 CMake 的组态档取名为 CMakeLists.txt。Cmake 并不直接建构出最终的软件，而是产生标准的建构档（如 Unix 的 Makefile 或 Windows Visual C++ 的 projects/workspaces），然后再依一般的建构方式使用。这使得熟悉某个集成开发环境（IDE）的开发者可以用标准的方式建构他的软件，这种可以使用各平台的原生建构系统的能力是 CMake 和 SCons 等其他类似系统的区别之处。
CMake is an open-source, cross-platform family of tools designed to build, test and package software. CMake is used to control the software compilation process using simple platform and compiler independent configuration files, and generate native makefiles and workspaces that can be used in the compiler environment of your choice. The suite of CMake tools were created by Kitware in response to the need for a powerful, cross-platform build environment for open-source projects such as ITK and VTK. (2018-11-04, LINUX, 5749KB, 下载0次)
linux 网络通信引擎,编程控件
血与荣誉软件科技是一个软件服务商，主要提供了网络与通信引擎和网络中间件开发的SDK，提供了跨平台，稳定可靠的网络通信引擎。你可以在这套引擎上面快速的部署你的网络应用程序环境。此引擎不光封装了高性能API函数，还封装了底层网络IO和网络应用与协议相关接口，你可以使用此SDK快速部署与开发大型或者中小型应用服务器以及其他与网络和通信相关的应用程序。
Linux network communication engine, programming control
Blood and honor software technology is a software service provider. It mainly provides SDK, which is developed by network and communication engine and network middleware. It provides cross platform, stable and reliable network communication engine. You can quickly deploy your network application environment on this engine. This engine not only encapsulates high-performance API functions, but also encapsulates the underlying network IO and network application and protocol related interfaces. You can use this SDK to quickly deploy and develop large or medium-sized application servers and other applications related to network and communication. (2018-03-29, LINUX, 47247KB, 下载2次)
MTK/联发2×2双频无线局域网5.0GHz网卡芯片MT7612EN
该MT7612E是一个高度集成的单芯片，内置了一个2×2双频无线局域网的无线。它支持IEEE802.11ac的标准草案，并提供最高的PHY速率可达867Mbps，提供功能丰富的无线连接和可靠的吞吐量从一个扩展的距离。优化的射频架构和基带算法提供了卓越的性能和低功耗消费。
MTK/mediatek 2 x 2 MT7612EN 5.0 GHz dual-band wireless LAN card chip
The MT7612E is a highly integrated single chip, built a 2 x 2 dual-band wireless LAN, wireless.It supports the draft standard IEEE802.11 ac, and provide the highest PHY rate of up to 867 MBPS, provide feature-rich wireless connections and reliable throughput the distance from an extension.Optimization of radio frequency (rf) architecture and baseband algorithm provides excellent performance and low power consumption.MT7612E integrated PA/LNA has referred to the number of external components is reduced to a minimum.Smart MAC design and deployment of an efficient DMA engine and data processing hardware accelerator uninstall host processor.The MT7612E support 802.11 I safety standards, and realize the hardware acceleration TKIP, CCMP and WAPI.The device will also support the QoS of 802.11 e video, voice and multimedia applications. (2018-02-10, LINUX, 2281KB, 下载15次)
用户MCU发送一次开始信号后,DHT11从低功耗模式转换到高速模式,等待主机开始信号结束后,DHT11发送响应信号,送出40bit的数据,并触发一次信号采集,用户可选择读取部分数据.从模式下,DHT11接收到开始信号触发一次温湿度采集,如果没有接收到主机发送开始信号,DHT11不会主动进行温湿度采集.采集数据后转换到低速模式。
Send a signal to the user MCU, DHT11 conversion from low power mode to high mode, waiting for a host computer after the start signal, the DHT11 transmits a response signal from the 40bit data, and trigger a signal acquisition, the user can choose to read the data. From the model, the DHT11 receives the start signal to trigger a temperature and humidity if the acquisition, not receiving host sends a signal to start, DHT11 will not take the initiative to the temperature and humidity data acquisition. After conversion to low speed mode. (2018-01-30, LINUX, 1KB, 下载1次)
(1) ap6212采用的是26M晶振，A框去掉，即不需要反相器；
(2) ap6212硬件上第29脚悬空，与ap6210不同；
(3)ap6212必须采用bcmhd新驱动1.201.34.x版本，如附件；
(4)ap6212 firmware部分如附件请覆盖至\hardware\broadcom\wlan\bcmdhd\firmware。
(1) ap6212 is a 26M crystal oscillator, and the A frame is removed, that is, no inverter is needed.
(2) ap6212 hardware is suspended in twenty-ninth feet, different from that of ap6210;
(3) ap6212 must adopt bcmhd new drive 1.201.34.x version, such as attachments;
(4) the ap6212 firmware section, such as an attachment, covers the \hardware\broadcom\wlan\bcmdhd\firmware. (2018-01-09, LINUX, 39KB, 下载18次)
最初由NASA的Ames研究中心开发，主要为了提供一个能满足异构计算网络需要的软件包，用于灵活的批处理，特别是满足高性能计算的需要，如集群系统、超级计算机和大规模并行系统。PBS的主要特点有：代码开放，免费获取；支持批处理、交互式作业和串行、多种并行作业，如MPI、 PVM、HPF、MPL；PBS是功能最为齐全, 历史最悠久, 支持最广泛的本地集群调度器之一. PBS的目前包括openPBS, PBS Pro和Torque三个主要分支. 其中OpenPBS是最早的PBS系统, 目前已经没有太多后续开发, PBS pro是PBS的商业版本, 功能最为丰富. Torque是Clustering公司接过了OpenPBS, 并给与后续支持的一个开源版本.
Originally developed by NASA's Ames Research Center, mainly to provide a software package that can meet the needs of heterogeneous computing network, for flexible batch processing, especially to meet the needs of high-performance computing, such as cluster system, supercomputer and massively parallel system. The main features of PBS are: open source, free access; support batch, interactive operation, a variety of parallel and serial operation, such as MPI, PVM, HPF, MPL; PBS is the most complete, the oldest and one of the most extensive local cluster. The scheduler supports PBS including openPBS, three main PBS Pro and Torque. The branch of OpenPBS is the first PBS system, at present there is not much development, PBS Pro is a commercial version of PBS, is the most feature rich. Torque Clustering company took over OpenPBS, and give an open source version of the follow-up support. (2017-12-28, LINUX, 5337KB, 下载2次)
A<========>B<=========>C<=====>D<======>E
A与B进程之间通过TCP的socket传递 主要掌握socket的流程：
A服务器端：
socket -->bind---->listen---->accept send read
B客户端：
socket-->connect->read send
不懂的可以man一下 man socket
B与C使用共享内存来交互
步骤是：shmget->shmat->直接读写--->shmdt shmctl(删除)
可以man
C与D之间使用消息传递进行
msgget-->msgrcv->msgsnd (注意这里的返回值判断发送正确与否 不是发送的字节数)
D使用fork（） 创建了一个进程 E
D跟E之间使用无名管道进行交互
E程序中可以使用有名管道 进行通讯。
A<========>B<=========>C<=====>D<======>E
Between the A and the B processes, the process of master socket is passed through the socket of the TCP:
A server side:
Socket -->bind---->listen---->accept send read
B client:
Socket-->connect->read send
Do not understand the ability to man man socket
B and C interact with shared memory
The step is: shmget->shmat-> read and write --->shmdt shmctl directly (delete)
Can man
Message passing between C and D
Msgget-->msgrcv->msgsnd (note that the return value here determines whether to send correctly or not the number of bytes sent)
D uses fork () to create a process E
Interaction between D and E using anonymous pipes
E programs can communicate with famous pipes. (2017-12-15, LINUX, 4KB, 下载7次)
一个操作系统必须和作为它的基础的硬件系统紧密配合。操作系统需要使用一些只有硬件才能提供的功能。为了完整的了解 Linux ，你需要了解底层硬件的基础知识。本章对于现代 PC 的硬件进行了。
1975 年 1 月“ Popular Electronics ”杂志封面上印出了 Altair 8080 的图片，一场革命开始了。 Altair 8080 ，跟随早期的“ Star Trek epsode ”命名，只需要 $397 ，就可由个人电子爱好者自己组装。它拥有 Intel 8080 处理器和 256 字节内存，但是没有屏幕和键盘。以今天的标准来衡量，它太简陋了。它的发明者， Ed Roberts ，制造了名词“ personal computer “来命名他的发明，但现在， PC 这个名词已经用来命名几乎所有你可以不依靠帮助就可以自己运行起来的计算机。用这个定义，甚至一些十分强大的 Alpha AXP 系统也是 PC 。
An operating system must work closely with the hardware system that is the base of it. The operating system needs to use some of the functions that are provided only by hardware. To get a complete understanding of Linux, you need to know the basic knowledge of the underlying hardware. This chapter has been carried out for the hardware of modern PC.
In January 1975, the Popular Electronics magazine covered the picture of Altair 8080 on the cover, and a revolution began. Altair 8080, named after the early "Star Trek epsode", requires only $397, which can be assembled by personal electronics enthusiasts themselves. It has a Intel 8080 processor and 256 bytes of memory, but there is no screen and keyboard. As measured by today's standards, it is too shabby. (2017-12-07, LINUX, 540KB, 下载3次)
产品名称: 居民身份证验证安全控制模块接口API动态链接库
版本: 2.0.2.0
日期: 12/27/2012
公司: 数据通信科学技术研究所（兴唐通信科技有限公司）
内容:
----------------------------
1. 文档
- 动态库使用手册:
- 居民身份证验证安全控制模块接口API使用手册.pdf(版本：2.0.2.0)
2. 软件
- sdtapi.dll
- API接口动态库。
- 此版本动态库的使用手册为“居民身份证验证安全控制模块接口API使用手册.pdf”，手册版本为2.0.2.0。
Product Name: resident identity authentication security control module interface API dynamic link library
Version: 2.0.2.0
Date: 12/27/2012
Company: data communication science and Technology Research Institute (Xingtang Communications Technology Co. Ltd)
Content:
----------------------------
1. document
- dynamic library manual:
- resident identity authentication security control module interface API using manual.Pdf (version: 2.0.2.0)
2. software
- sdtapi.dll
- API interface dynamic library.
- the use manual of this version of the dynamic library is "the user identity authentication security control module interface API use manual.Pdf", and the manual version is 2.0.2.0. (2017-12-06, LINUX, 2132KB, 下载10次)
在linux的网络编程中，很长的时间都在使用select来做事件触发。在linux新的内核中，有了一种替换它的机制，就是epoll。
相比于select，epoll最大的好处在于它不会随着监听fd数目的增长而降低效率。因为在内核中的select实现中，它是采用轮询来处理的，轮询的fd数目越多，自然耗时越多
In Linux network programming, long time used in the select to do event trigger. In the new Linux kernel, there is a kind of mechanism of replacing it, is the epoll.
Compared to select, epoll biggest advantage is that it will not be reduced as the number of monitored fd increase efficiency. Because in the implementation of the select kernel, it is to use the polling to deal with it, the number of fd polling, the more natural the more time-consuming (2017-10-10, LINUX, 1KB, 下载1次)
本书在《MPLS和VPN体系结构》(第1卷)的基础上讨论高级MPLS VPN应用主题和开发体系结构。全书分为4个部分，共9章。第1部分是引言，简要回顾MPLS VPN体系结构；第2部分讲述高级PE-CE连通性，包括MPLS VPN的远程访问、PE-CE路由协议的增强和高级特性、虚拟路由器的连通性；第3部分讨论高级部署场景，包括对MPLS VPN骨干网的保护、大规模路由选择和多服务提供商的连通性、多播VPN、跨MPLS骨干网的IPv6传输；第4部分是故障排除。 本书面向中、高级网络技术人员。对于需要参与高级、大规模MPLS或MPLS VPN网络的设计、维护与应用的人来说，本书是必读书籍。
This book discusses the advanced MPLS VPN application topics and development architecture based on the MPLS and VPN architecture (volume first). The book is divided into 4 parts, a total of 9 chapters. The first part is the introduction, a brief review of the MPLS VPN architecture; the second part is about the senior PE-CE connectivity, including the MPLS VPN remote access, PE-CE routing protocol and advanced features, enhanced virtual router connectivity; the third part discusses the advanced deployment scenarios, including the protection of IPv6 transmission, MPLS VPN routing and large-scale backbone network multi service provider connectivity, VPN multicast, across MPLS backbone network; the fourth part is the troubleshooting. This written to middle and senior network technical personnel. This is a must read book for people who need to be involved in the design, maintenance, and application of advanced, large-scale MPLS or MPLS VPN networks. (2017-09-21, LINUX, 20914KB, 下载19次)
官方下载的MSTAR数据集。该实验数据采用美国国防高等研究计划署(DARPA)支持的MSTAR计划所公布的实测SAR地面静止目标数据，无论是在国内还是国际上，针对SAR图像目标识别的研究基本上是基于该数据集而展开的。采集该数据集的传感器为高分辨率的聚束式合成孔径雷达，该雷达的分辨率为0.3m×0.3m。工作在X波段，所用的极化方式为HH极化方式。
MSTAR data set downloaded from SDMS. The experimental data comes from MSTAR plans,the U.S. Defense Advanced Research Projects Agency (DARPA) SAR measured plans.either in domestic or international, researches on SAR image target recognition is basically carried out based on the data set. The sensor for this data set is a high resolution spotlight synthetic aperture radar (SAR) with a resolution of 0.3m * 0.3m. Working in X band, the polarization mode used is HH polarization mode (2017-08-21, LINUX, 4KB, 下载67次)
cppcheck 是一个静态代码检查工具，支持c, c++ 代码；作为编译器的一种补充检查，cppcheck对产品的源代码执行严格的逻辑检查。 执行的检查包括：
1. 自动变量检查
2. 数组的边界检查
3. class类检查
4. 过期的函数，废弃函数调用检查
5. 异常内存使用，释放检查
6. 内存泄漏检查，主要是通过内存引用指针
7. 操作系统资源释放检查，中断，文件描述符等
8. 异常STL 函数使用检查
9. 代码格式错误，以及性能因素检查
Cppcheck is a static analysis tool for C/C++ code. Unlike C/C++ compilers and many other analysis tools it does not detect syntax errors in the code. Cppcheck primarily detects the types of bugs that the compilers normally do not detect. The goal is to detect only real errors in the code (i.e. have zero false positives). (2017-07-17, LINUX, 7348KB, 下载2次)
LUFS 是一个混合用户空间文件系统框架，支持不定数量的对用户透明的文件系统（localfs, sshfs, ftpfs, httpfs, socketfs, freenetfs, 和nutellafs)。它可以被看作和VFS（虚拟文件系统转换）完成同样的内核功能：它是一个转换器，分布文件系统调用到支持它的文件系统。然而，LUFS文件系统是在用户空间中实现的。
driver is a mixed user-space file system framework, support for variable amounts of transparent to users of File System (localfs, sshfs, ftpfs, httpfs, socketfs, freenetfs and nutellafs). It can be seen and VFS (virtual file system) completion of the same core functions : it is a converter, called Distributed File System to support its file system. However, the driver file system is the user space to achieve. (2004-09-05, LINUX, 12KB, 下载17次)