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<!DOCTYPE html>
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<head hexo-theme='https://github.com/volantis-x/hexo-theme-volantis/tree/4.2.0'>
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<title>zhiPeng</title>
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<header id="l_header" class="l_header always shadow blur floatable " >
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<a class="title flat-box" target="_self" href='/'>
<img no-lazy class='logo' src='/img/webTitle.png'/>
</a>
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<i class='fas fa-info-circle fa-fw'></i>关于
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</header>
<div id="l_body">
<div id="l_cover">
<div id="half" class='cover-wrapper dock' style="display: ;">
<div id='cover-backstretch'></div>
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<img no-lazy class='logo' src='/img/centerLogo.gif'/>
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id="home">
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id="photo">
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id="projects">
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<section class="post-list">
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<div class="post post-v3 white-box reveal shadow">
<div class='headimg-div'>
<a class='headimg-a' href="/2021/04/24/%E9%9F%B3%E8%A7%86%E9%A2%91/H.264%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86%E6%80%BB%E7%BB%93/">
<img class='headimg' src='https://zip-link.github.io/Image/H264基础封面.jpg'/>
</a>
</div>
<h2 class="article-title" >
<a href="/2021/04/24/%E9%9F%B3%E8%A7%86%E9%A2%91/H.264%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86%E6%80%BB%E7%BB%93/">
H.264基础知识总结
</a>
</h2>
<div class='md'>
<p>H264是视频编解码格式；学习H264之前首先要搞明白一个问题，视频为什么要编码，编码传输不行吗？视频就是一堆图片按时间顺序播放，在编码标准出现之前，不经过编码的原始码流，可以这么理解成就是携带时间戳的图片。可以随便找个图片看下他的大小小则几十K，比较清晰的甚至需要十几M。这么大的数据量造成了，视频在存储时会耗费大量的存储空间，网络传输时占用大量带宽和流量，而编码就是为了减少视频的数据量，减少存储和网络中浪费的资源，在发送端做压缩在接收端做解压；接收端播放时将压缩后的数据量依据编解码算法和编解码规则，解码出来的视频和不经过压缩后传输的效果做到几乎一样；<strong>编码的本质是压缩</strong></p>
</div>
<div class='meta-v3' line_style='solid'>
<div>
<time>2021-04-24</time>
<span class="dot"></span>
<a class="category-link" href="/categories/%E9%9F%B3%E8%A7%86%E9%A2%91/">-音视频</a>
</div>
<div>
<a class='readmore' href='/2021/04/24/%E9%9F%B3%E8%A7%86%E9%A2%91/H.264%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86%E6%80%BB%E7%BB%93/'>
Read More
</a>
</div>
</div>
</div>
</div>
<div class='post-wrapper'>
<div class="post post-v3 white-box reveal shadow">
<div class='headimg-div'>
<a class='headimg-a' href="/2021/01/31/embedded/IOT/MQTT%E2%80%94%E2%80%94%E5%BF%AB%E9%80%9F%E6%90%AD%E5%BB%BA%E5%AE%A2%E6%88%B7%E7%AB%AF%E5%92%8C%E6%9C%8D%E5%8A%A1%E5%99%A8/">
<img class='headimg' src='https://zip-link.github.io/Image/MQTT_headimg.png'/>
</a>
</div>
<h2 class="article-title" >
<a href="/2021/01/31/embedded/IOT/MQTT%E2%80%94%E2%80%94%E5%BF%AB%E9%80%9F%E6%90%AD%E5%BB%BA%E5%AE%A2%E6%88%B7%E7%AB%AF%E5%92%8C%E6%9C%8D%E5%8A%A1%E5%99%A8/">
MQTT——快速搭建客户端和服务器
</a>
</h2>
<div class='md'>
<p>MQTT是物联网中应用及其广泛的应用协议，mqtt由于其带宽低和基于发布订阅的模式的优点，被各物联网平台推广使用。MQTT首先有三个角色：订阅者、发布者、中间代理。订阅者通过订阅指定消息类型可收到发布者发布的制定类型消息。服务器作为代理做消息的转发。这种基于发布订阅的模式与物联网中边缘终端1对N的特征完全匹配。不得不说MQTT协议天生为物联网而生。</p>
</div>
<div class='meta-v3' line_style='solid'>
<div>
<time>2021-01-31</time>
<span class="dot"></span>
<a class="category-link" href="/categories/%E5%B5%8C%E5%85%A5%E5%BC%8F/">嵌入式</a><span class="sep"></span><a class="category-link" href="/categories/%E5%B5%8C%E5%85%A5%E5%BC%8F/IOT/">IOT</a>
</div>
<div>
<a class='readmore' href='/2021/01/31/embedded/IOT/MQTT%E2%80%94%E2%80%94%E5%BF%AB%E9%80%9F%E6%90%AD%E5%BB%BA%E5%AE%A2%E6%88%B7%E7%AB%AF%E5%92%8C%E6%9C%8D%E5%8A%A1%E5%99%A8/'>
Read More
</a>
</div>
</div>
</div>
</div>
<div class='post-wrapper'>
<div class="post post-v3 white-box reveal shadow">
<div class='headimg-div'>
<a class='headimg-a' href="/2021/01/31/linux/%E5%86%85%E5%AD%98/%E6%B5%85%E8%B0%88%E5%86%85%E5%AD%98%E5%87%BD%E6%95%B0%E6%A0%88%E4%B8%AD%E7%9A%84%E6%A0%88%E5%B8%A7(ARM)/">
<img class='headimg' src='https://img.vim-cn.com/d9/a9af7dc49fc0af8ca3e6dd2450a2f7095a87db.png'/>
</a>
</div>
<h2 class="article-title" >
<a href="/2021/01/31/linux/%E5%86%85%E5%AD%98/%E6%B5%85%E8%B0%88%E5%86%85%E5%AD%98%E5%87%BD%E6%95%B0%E6%A0%88%E4%B8%AD%E7%9A%84%E6%A0%88%E5%B8%A7(ARM)/">
浅谈内存函数栈中的栈帧(arm)
</a>
</h2>
<div class='md'>
<p>栈是函数调用的实现基础，而栈帧就是函数调用栈中的一个基础知识点。对栈帧理解后能更好的理解函数运行过程。<br>简单来理解，程序运行过程中，PC指针每遇到一个函数，栈都会新增一个栈帧。栈帧记录着函数的<strong>参数</strong>，<strong>返回地址</strong>，父函数的<strong>栈底指针</strong>和自身相关的<strong>局部变量</strong>等。理解栈帧前先明确以下几个寄存器概念：</p>
</div>
<div class='meta-v3' line_style='solid'>
<div>
<time>2021-01-31</time>
<span class="dot"></span>
<a class="category-link" href="/categories/Linux/">Linux</a><span class="sep"></span><a class="category-link" href="/categories/Linux/%E5%86%85%E5%AD%98/">内存</a>
</div>
<div>
<a class='readmore' href='/2021/01/31/linux/%E5%86%85%E5%AD%98/%E6%B5%85%E8%B0%88%E5%86%85%E5%AD%98%E5%87%BD%E6%95%B0%E6%A0%88%E4%B8%AD%E7%9A%84%E6%A0%88%E5%B8%A7(ARM)/'>
Read More
</a>
</div>
</div>
</div>
</div>
<div class='post-wrapper'>
<div class="post post-v3 white-box reveal shadow">
<h2 class="article-title" >
<a href="/2021/01/01/2020%E4%B8%8D%E8%AE%B2%E6%AD%A6%E5%BE%B7%EF%BC%8C2021%E8%83%BD%E5%90%A6%E6%94%B9%E5%8F%98/">
2020不讲武德，2021能否改变
</a>
</h2>
<div class='md'>
<p>2020过的真快，可能是因为疫情原因，一年到头没怎么出门，现在回想这一年基本一直在工作。没有什么时间和朋友出去转转的机会。当然离家太远也没什么交心的朋友，也可能是工作之后每年都是这样吧。</p>
</div>
<div class='meta-v3' line_style='solid'>
<div>
<time>2021-01-01</time>
</div>
<div>
<a class='readmore' href='/2021/01/01/2020%E4%B8%8D%E8%AE%B2%E6%AD%A6%E5%BE%B7%EF%BC%8C2021%E8%83%BD%E5%90%A6%E6%94%B9%E5%8F%98/'>
Read More
</a>
</div>
</div>
</div>
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</a>
</div>
<h2 class="article-title" >
<a href="/2020/12/27/embedded/IOT/esp8266_1/">
物联网利器——ESP8266（入门及环境搭建）
</a>
</h2>
<div class='md'>
<p>早就听说过，8266这款MCU，B站上也看多过好多人用这个板子DIY自己的作品，所以前段时间从某宝购入了一款全引脚引出的8266开发板，核心板本身就集成WIFI和Flash，整个板子除了核心板和串口转USB芯片，没别的东西，看起来比较小巧，当然还有比这更小的只有核心板的芯片，不过那种没有几个IO口可用，某宝也是有卖的。</p>
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<time>2020-12-27</time>
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<a href="/2020/12/27/embedded/IOT/esp8266_2/">
8266驱动spi屏ST7735小结
</a>
</h2>
<div class='md'>
<p>ESP8266+arduino确实是一个神奇的组合，很适合新人入手，不过对于从51或者32转型的过来人，使用起来颇有些崴脚。首先是开源库的存在，依托arduino的开源，在IDE或者github有很多的开源库使用，我猜测现有的一些驱动，估计都能找到驱动库，具体怎么找可能就要自己花费些时间了。</p>
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<time>2020-12-27</time>
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<a class="category-link" href="/categories/%E5%B5%8C%E5%85%A5%E5%BC%8F/">嵌入式</a><span class="sep"></span><a class="category-link" href="/categories/%E5%B5%8C%E5%85%A5%E5%BC%8F/IOT/">IOT</a>
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<img class='headimg' src='https://img-blog.csdnimg.cn/20200830154514733.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMjgxNjAx,size_16,color_FFFFFF,t_70#pic_center'/>
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<h2 class="article-title" >
<a href="/2020/12/27/coding/%E7%BA%BF%E7%A8%8B%E6%B1%A0/%E5%9F%BA%E7%A1%80%E5%AD%A6%E4%B9%A0%E6%80%BB%E7%BB%93%E2%80%94%E2%80%94%E7%BA%BF%E7%A8%8B%E6%B1%A0/">
基础学习总结——线程池
</a>
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<p>经常听到线程池的概念，不过在实际工作和项目里没有应用过线程池。线程池可能是作为服务端的开发经常用到的技术架构，所以最近我也通过网络简单的学习了下线程池的概念，稍微理解了线程池的应用场景。</p>
<p>在高并发的服务环境下，存在多个客户端访问服务端相同服务的场景，而传统方式，是为多客户端创建一一对应的处理线程，这在高并发场景下极大的耗费服务端的资源。为了解决这类问题，服务端可使用线程池，为同一服务创建相同的<strong>线程队列</strong>，这些线程循环处理工作队列中的任务，当有客户端需要这种服务时将增加任务到<strong>工作队列</strong>中。</p>
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<time>2020-12-27</time>
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<a class="category-link" href="/categories/Linux/">Linux</a><span class="sep"></span><a class="category-link" href="/categories/Linux/%E7%BA%BF%E7%A8%8B%E6%B1%A0/">线程池</a>
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<a href="/2020/08/23/linux/%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91%E4%B8%AD%E5%B8%B8%E7%94%A8%E7%9A%84%E8%BF%9B%E7%A8%8B%E7%BA%BF%E7%A8%8B%E9%80%9A%E4%BF%A1/">
应用开发中常用的进程线程通信
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<p>进程通信是学习应用编程的基础，尤其是对于大型嵌入式项目而言，熟悉常用的通信方式是能写好代码和能看懂代码的前提。其实在大学刚接触linux就学习过进程间的几种通信方式，不过由于当时接触的项目都比较简单，导致没能对这几种通信有比较好的理解和应用。工作之后有了大量的代码阅读量，感觉对几种通信的应用有了新的认识，所以坐下简单的总结。</p>
<ol>
<li>共享内存</li>
<li>信号量</li>
<li>消息队列</li>
<li>管道
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<time>2020-08-23</time>
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<a class="category-link" href="/categories/Linux/">Linux</a><span class="sep"></span><a class="category-link" href="/categories/Linux/%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/">应用开发</a>
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<a class='readmore' href='/2020/08/23/linux/%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91%E4%B8%AD%E5%B8%B8%E7%94%A8%E7%9A%84%E8%BF%9B%E7%A8%8B%E7%BA%BF%E7%A8%8B%E9%80%9A%E4%BF%A1/'>
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<a href="/2020/08/16/linux/%E5%86%85%E6%A0%B8/">
linux开机自启脚本
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<p>系统初始化完成后会运行初始化脚本 rc.local，想要实现开机自动启动某个功能，可以在这个脚本增加些执行命令。</p>
<p>rc.local/rc.sysinit，一般为路径为/etc/rc.d/rc.local或/etc/rc.d/rc.sysinit</p>
<p>可以直接在脚本退出之前执行某个脚本或执行某个shell命令</p>
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<time>2020-08-16</time>
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<a class="category-link" href="/categories/Linux/">Linux</a><span class="sep"></span><a class="category-link" href="/categories/Linux/%E5%86%85%E6%A0%B8%E5%BA%94%E7%94%A8/">内核应用</a>
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<a href="/2020/08/16/Server/ajax/%E5%86%85%E6%A0%B8/">
linux开机自启脚本
</a>
</h2>
<div class='md'>
<p>系统初始化完成后会运行初始化脚本 rc.local，想要实现开机自动启动某个功能，可以在这个脚本增加些执行命令。</p>
<p>rc.local/rc.sysinit，一般为路径为/etc/rc.d/rc.local或/etc/rc.d/rc.sysinit</p>
<p>可以直接在脚本退出之前执行某个脚本或执行某个shell命令</p>
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<time>2020-08-16</time>
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