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IMX6ULL嵌入式Linux驱动学习笔记（五）.html
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class="body-wrap"><div class="menu-l"><div class="canvas-wrap"><canvas data-colors="#eaeaea" data-sectionheight="100" data-contentid="js-content" id="myCanvas1" class="anm-canvas"></canvas></div><div id="js-content" class="content-ll"><article id="post-IMX6ULL嵌入式Linux驱动学习笔记（五）" class="article article-type-post" itemscope itemprop="blogPost"><div class="article-inner"><header class="article-header"><h1 class="article-title" itemprop="name">IMX6ULL嵌入式Linux驱动学习笔记（五）</h1><span id="busuanzi_container_page_pv" style="display:none" class="archive-article-date"><i class="icon-smile icon"></i> 阅读数：<span id="busuanzi_value_page_pv"></span>次 </span><a href="/IMX6ULL%E5%B5%8C%E5%85%A5%E5%BC%8FLinux%E9%A9%B1%E5%8A%A8%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0%EF%BC%88%E4%BA%94%EF%BC%89.html" class="archive-article-date"><time datetime="2020-09-19T13:51:40.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2020-09-19</time></a><div style="margin-top:10px"><span class="post-time"><span class="post-meta-item-icon"><i class="icon-statistics"></i> <span class="post-meta-item-text">字数统计:</span> <span class="post-count">5.8k字</span> </span></span><span class="post-time"> | <span class="post-meta-item-icon"><i class="icon-book icon"></i> <span class="post-meta-item-text">阅读时长≈</span> <span class="post-count">25分</span></span></span></div></header><div class="article-entry" itemprop="articleBody"><p><strong>IMX6ULL嵌入式Linux驱动开发学习</strong></p><p>以下内容是我在学习正点原子<code>IMX6ULL</code>开发板<code>alpha</code>中记录的笔记，部分摘录自正点原子<code>IMX6ULL开发手册</code>。</p><h2 id="一、什么是设备树"><a href="#一、什么是设备树" class="headerlink" title="一、什么是设备树"></a>一、什么是设备树</h2><ol><li>设备树：设备和树。</li><li>描述设备树的文件叫做<code>DTS</code>(Device Tree Source)，这个 <code>DTS</code> 文件采用树形结构描述本板级设备，也就是开发板上的设备信息。比如CPU数量、内存基地址、<code>IIC</code> 接口上外接了哪些设备等等。</li><li>由于以前板级信息都是写到 <code>.c</code> 文件里面，导致 <code>linux</code> 内核臃肿。因此将板级信息做成独立的格式，文件扩展名为 <code>.dts</code> 。一个平台或者机器对应一个 <code>.dts</code> 。</li></ol><a id="more"></a><h2 id="二、DTS、DTB和DTC的关系"><a href="#二、DTS、DTB和DTC的关系" class="headerlink" title="二、DTS、DTB和DTC的关系"></a>二、DTS、DTB和DTC的关系</h2><p><code>.dts</code> 相当于 <code>.c</code> ，就是DTS源码文件。<code>DTC</code> 工具相当于 <code>gcc</code> 编译器，将 <code>.dts</code> 编译成 <code>.dtb</code> 。<code>dtb</code> 相当于 <code>bin</code> 文件或可执行文件。</p><p>通过 <code>make dtbs</code> 命令来编译所有的 <code>.dts</code> 文件，通过 <code>make xxxxx.dtb</code> 来编译对应的 <code>.dts</code> 文件，需要在 <code>makefile</code> 中添加 <code>.dts</code> 文件所在路径。编译 <code>dts</code> 文件的 <code>Makefile</code> 在 <code>arch/arm/boot/dts</code> 下。</p><h2 id="三、DTS基本语法"><a href="#三、DTS基本语法" class="headerlink" title="三、DTS基本语法"></a>三、DTS基本语法</h2><p>这篇<a href="https://blog.csdn.net/u014717231/article/details/53139968" target="_blank" rel="noopener">DTS入门知识</a>博客对<code>DTS</code>进行了入门的讲解。</p><ol><li><p>DTS是 <code>/</code> 开始。</p></li><li><p>从 <code>/</code> 根节点开始描述设备信息。</p></li><li><p>在 <code>/</code> 根节点外有一些 <code>&cpu0</code> 的语句是”追加“。</p></li><li><p>节点名字的要求</p><p><code>label: node-name@unit-address</code> 标签: 节点名字@地址。</p><ul><li><code>label</code> ：为了方便的访问节点。</li><li><code>node-name</code> ：可使用的字符 [0~9] [a~z] [A~Z] [ , . + - _ ]。约定使用小写。</li><li><code>unit-address</code> ：一般是外设寄存器的起始地址。有的是外设的设备地址或者其他含义，需要根据情况来分析。</li></ul></li></ol><h2 id="四、设备树在系统中的体现"><a href="#四、设备树在系统中的体现" class="headerlink" title="四、设备树在系统中的体现"></a>四、设备树在系统中的体现</h2><p>系统启动以后可以在根文件系统里面看到设备树的节点信息。在 <code>/proc/device-tree/</code> <code>-></code> <code>/sys/firmware/devicetree/base</code> 目录下存放着设备树信息。</p><p>内核启动的时候会解析设备树，然后在 <code>/proc/device-tree/</code>目录下呈现出来。</p><h2 id="五、特殊节点"><a href="#五、特殊节点" class="headerlink" title="五、特殊节点"></a>五、特殊节点</h2><ol><li><code>aliases</code> 节点，对节点进行取别名。</li><li><code>chosen</code> 节点，主要目的就是将 <code>uboot</code> 里面的 <code>bootargs</code> 环境变量值，传递给 <code>linux</code> 内核作为命令行参数 <code>cmd line</code> 。<code>uboot</code> 会将 <code>bootargs</code> 环境变量写入 <code>chosen</code> 节点中，通过 <code>fdt_chosen</code> 函数。</li></ol><h2 id="六、属性"><a href="#六、属性" class="headerlink" title="六、属性"></a>六、属性</h2><table><thead><tr><th>嵌入式不常用或弃用属性</th><th>实例</th><th>作用</th></tr></thead><tbody><tr><td>ranges</td><td>ranges = <child-bus-address,parent-bus-address,length> / <code>ranges;</code></td><td>ranges是一个地址映射/转换表,ranges 属性每个项目由子地址、父地址和地址空间长度这三部分组成:<br><code>child-bus-address</code>:子总线地址空间的物理地址,由父节点的#address-cells 确定此物理地址所占用的字长。<br><code>parent-bus-address</code>:父总线地址空间的物理地址,同样由父节点的#address-cells 确定此物理地址所占用的字长。<br><code>length</code>:子地址空间的长度,由父节点的#size-cells 确定此地址长度所占用的字长。<br>如果 ranges 属性值为空值，说明子地址空间和父地址空间完全相同，不需要进行地址转换。</td></tr><tr><td>name</td><td></td><td>name 属性用于记录节点名字,name 属性已经被弃用,不推荐使用name 属性,一些老的设备树文件可能会使用此属性。</td></tr><tr><td>device_type</td><td>device_type = “cpu”;</td><td>用于描述设备的 FCode,但是设备树没有 FCode,所以此属性也被抛弃了。此属性只能用于 cpu 节点或者 memory 节点。imx6ull.dtsi 的 cpu0 节点用到了此属性。</td></tr></tbody></table><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* ranges属性不为空时 */</span></span><br><span class="line">soc {</span><br><span class="line"> compatible = <span class="string">"simple-bus"</span>;</span><br><span class="line"> <span class="meta">#address-cells = <span class="meta-string"><1>;</span></span></span><br><span class="line"> <span class="meta">#size-cells = <span class="meta-string"><1>;</span></span></span><br><span class="line"> ranges = <<span class="number">0x0</span> <span class="number">0xe0000000</span> <span class="number">0x00100000</span>>;</span><br><span class="line"> </span><br><span class="line"> serial {</span><br><span class="line"> device_type = <span class="string">"serial"</span>;</span><br><span class="line"> compatible = <span class="string">"ns16550"</span>;</span><br><span class="line"> reg = <<span class="number">0x4600</span> <span class="number">0x100</span>>;</span><br><span class="line"> clock-frequency = <<span class="number">0</span>>;</span><br><span class="line"> <span class="built_in">interrupts</span> = <<span class="number">0xA</span> <span class="number">0x8</span>>;</span><br><span class="line"> interrupt-parent = <&ipic>;</span><br><span class="line"> };</span><br><span class="line">};</span><br><span class="line"> </span><br><span class="line">第 <span class="number">6</span> 行，节点 soc 定义的 ranges 属性，值为<<span class="number">0x0</span> <span class="number">0xe0000000</span> <span class="number">0x00100000</span>>，此属性值指定</span><br><span class="line">了一个 <span class="number">1024</span>KB(<span class="number">0x00100000</span>)的地址范围，子地址空间的物理起始地址为 <span class="number">0x0</span>，父地址空间的物</span><br><span class="line">理起始地址为 <span class="number">0xe0000000</span>。</span><br><span class="line">第 <span class="number">11</span> 行， serial 是串口设备节点， reg 属性定义了 serial 设备寄存器的起始地址为 <span class="number">0x4600</span>，</span><br><span class="line">寄存器长度为 <span class="number">0x100</span>。经过地址转换， serial 设备可以从 <span class="number">0xe0004600</span> 开始进行读写操作，</span><br><span class="line"><span class="number">0xe0004600</span> = <span class="number">0x4600</span> + <span class="number">0xe0000000</span>。</span><br></pre></td></tr></table></figure><hr><table><thead><tr><th>属性</th><th>实例/可选值</th><th>作用</th></tr></thead><tbody><tr><td>compatible</td><td>compatible = “fsl,imx6ul-evk-wm8960”,”fsl,imx-audio-wm8960”;</td><td>设备兼容属性</td></tr><tr><td>mode</td><td>model = “wm8960-audio”;</td><td>描述设备模块信息</td></tr><tr><td>status</td><td><code>okay</code>/<code>disabled</code>/<code>fail</code>/<code>fail-sss</code></td><td>描述设备状态</td></tr><tr><td>#address-cells</td><td>#address-cells = <1>;</td><td>描述了<strong>子节点</strong><code>reg</code>属性中地址信息所占用的字长(32 位)</td></tr><tr><td>#size-cells</td><td>#size-cells = <1>;</td><td>描述了<strong>子节点</strong><code>reg</code>属性中长度信息所占的字长(32 位)</td></tr><tr><td>reg</td><td>reg = <address1 length1 address2 length2……></td><td>描述设备起始地址和长度</td></tr></tbody></table><h2 id="七、特殊的属性"><a href="#七、特殊的属性" class="headerlink" title="七、特殊的属性"></a>七、特殊的属性</h2><p><code>compatible</code>属性，值是字符串。</p><p>根节点<code>/</code>下的<code>compatible</code>属性，内核在启动的时候会检查是否支持此平台，在以前不使用设备树的时候会通过<code>machine id</code>来判断内核是否支持此机器。使用设备数后不再使用机器ID，而是使用根节点<code>/</code>下的<code>compatible</code>属性。</p><p>未使用设备树的结构体</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">define</span> MACHINE_START(_type,_name) \</span></span><br><span class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="class"><span class="keyword">struct</span> <span class="title">machine_desc</span> __<span class="title">mach_desc_</span>##_<span class="title">type</span> \</span></span><br><span class="line"><span class="class">__<span class="title">used</span> \</span></span><br><span class="line"><span class="class">__<span class="title">attribute__</span>((__<span class="title">section__</span>(".<span class="title">arch</span>.<span class="title">info</span>.<span class="title">init</span>"))) = {</span> \</span><br><span class="line"> .nr = MACH_TYPE_##_type, \</span><br><span class="line"> .name = _name, \</span><br><span class="line"> </span><br><span class="line">#define MACHINE_END \</span><br><span class="line">};</span><br></pre></td></tr></table></figure><p>使用设备树的结构体</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">define</span> DT_MACHINE_START(_name, _namestr) \</span></span><br><span class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="class"><span class="keyword">struct</span> <span class="title">machine_desc</span> __<span class="title">mach_desc_</span>##_<span class="title">name</span> \</span></span><br><span class="line"><span class="class">__<span class="title">used</span> \</span></span><br><span class="line"><span class="class">__<span class="title">attribute__</span>((__<span class="title">section__</span>(".<span class="title">arch</span>.<span class="title">info</span>.<span class="title">init</span>"))) = {</span> \</span><br><span class="line"> .nr = ~<span class="number">0</span>, \</span><br><span class="line"> .name = _namestr, \</span><br><span class="line"></span><br><span class="line">#define MACHINE_END \</span><br><span class="line">};</span><br></pre></td></tr></table></figure><h2 id="八、Linux内核的OF操作函数"><a href="#八、Linux内核的OF操作函数" class="headerlink" title="八、Linux内核的OF操作函数"></a>八、Linux内核的OF操作函数</h2><ol><li><p>驱动如何获取到设备树中的设备信息。在驱动中使用<code>OF</code>函数获取设备树属性内容。</p><ol start="2"><li><p>驱动要想获取到设备树节点内容，首先要找到节点。</p></li><li><p>查找节点的of函数：</p><ul><li><p><code>of_find_node_by_name</code>函数</p><p>of_find_node_by_name 函数通过节点名字查找指定的节点,函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">struct device_node *<span class="title">of_find_node_by_name</span><span class="params">(struct device_node *from, <span class="keyword">const</span> <span class="keyword">char</span> *name)</span></span>;</span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>from：开始查找的节点,如果为<code>NULL</code>表示从根节点开始查找整个设备树。<br>name：要查找的节点名字。<br>返回值：找到的节点,如果为<code>NULL</code>表示查找失败。</p></li><li><p><code>of_find_node_by_type</code>函数</p><p>of_find_node_by_type 函数通过<code>device_type</code>属性查找指定的节点,函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">struct device_node *<span class="title">of_find_node_by_type</span><span class="params">(struct device_node *from, <span class="keyword">const</span> <span class="keyword">char</span> *type)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>from：开始查找的节点,如果为 <code>NULL</code> 表示从根节点开始查找整个设备树。<br>type：要查找的节点对应的 <code>type</code> 字符串,也就是<code>device_type</code>属性值。<br>返回值：找到的节点,如果为<code>NULL</code>表示查找失败。</p></li><li><p><code>of_find_compatible_node</code>函数</p><p>of_find_compatible_node 函数根据<code>device_type</code>和<code>compatible</code>这两个属性查找指定的节点,<br>函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">struct device_node *<span class="title">of_find_compatible_node</span><span class="params">(struct device_node *from,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> *type, <span class="keyword">const</span> <span class="keyword">char</span> *compatible)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>from：开始查找的节点,如果为<code>NULL</code>表示从根节点开始查找整个设备树。<br>type：要查找的节点对应的<code>type</code>字符串,也就是<code>device_type</code>属性值,可以为<code>NULL</code>,表示忽略掉<code>device_type</code>属性。<br>compatible：要查找的节点所对应的<code>compatible</code>属性列表。<br>返回值：找到的节点,如果为<code>NULL</code>表示查找失败。</p></li><li><p><code>of_find_matching_node_and_match</code>函数</p><p>of_find_matching_node_and_match 函数通过<code>of_device_id</code>匹配表来查找指定的节点,函数原<br>型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">struct device_node *<span class="title">of_find_matching_node_and_match</span><span class="params">(struct device_node *from,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> struct of_device_id *matches,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> struct of_device_id **match)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:</p><p>from：开始查找的节点,如果为<code>NULL</code>表示从根节点开始查找整个设备树。<br>matches：<code>of_device_id</code>匹配表,也就是在此匹配表里面查找节点。<br>match：找到的匹配的<code>of_device_id</code>。</p><p>返回值：找到的节点,如果为<code>NULL</code>表示查找失败。</p></li><li><p><code>of_find_node_by_path</code>函数<br>of_find_node_by_path 函数通过路径来查找指定的节点,函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">struct device_node *<span class="title">of_find_node_by_path</span><span class="params">(<span class="keyword">const</span> <span class="keyword">char</span> *path)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>path：带有全路径的节点名,可以使用节点的别名,比如<code>/backlight</code>就是<code>backlight</code>这个节点的全路径。<br>返回值：找到的节点,如果为<code>NULL</code>表示查找失败。</p></li></ul></li></ol></li><li><p>查找父/子节点的of函数</p><ul><li><p><code>of_get_parent</code>函数</p><p>of_get_parent 函数用于获取指定节点的父节点(如果有父节点的话),函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">struct device_node *<span class="title">of_get_parent</span><span class="params">(<span class="keyword">const</span> struct device_node *node)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:</p><p>node：要查找的父节点的节点。<br>返回值：找到的父节点。</p></li><li><p><code>of_get_next_child</code>函数</p><p>of_get_next_child 函数用迭代的查找子节点,函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">struct device_node *<span class="title">of_get_next_child</span><span class="params">(<span class="keyword">const</span> struct device_node *node,</span></span></span><br><span class="line"><span class="function"><span class="params"> struct device_node *prev)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>node：父节点。<br>prev：前一个子节点,也就是从哪一个子节点开始迭代的查找下一个子节点。可以设置为<code>NULL</code>,表示从第一个子节点开始。<br>返回值：找到的下一个子节点。</p></li></ul></li><li><p>提取属性值的of函数</p><p>节点的属性信息里面保存了驱动所需要的内容,因此对于属性值的提取非常重要, Linux 内<br>核中使用结构体<code>property</code>表示属性,此结构体同样定义在文件<code>include/linux/of.h</code>中,内容如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">property</span> {</span></span><br><span class="line"> <span class="keyword">char</span> *name; <span class="comment">/* 属性名字 */</span></span><br><span class="line"> <span class="keyword">int</span> length; <span class="comment">/* 属性长度 */</span></span><br><span class="line"> <span class="keyword">void</span> *value; <span class="comment">/* 属性值 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">property</span> *<span class="title">next</span>;</span> <span class="comment">/* 下一个属性 */</span></span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">long</span> _flags; </span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">int</span> unique_id;</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">bin_attribute</span> <span class="title">attr</span>;</span> </span><br><span class="line">};</span><br></pre></td></tr></table></figure><ul><li><p><code>of_find_property</code>函数</p><p>of_find_property 函数用于查找指定的属性,函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">property *<span class="title">of_find_property</span><span class="params">(<span class="keyword">const</span> struct device_node *np,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> *name,<span class="keyword">int</span> *lenp)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>np：设备节点。<br>name：属性名字。<br>lenp：属性值的字节数<br>返回值：找到的属性。</p></li><li><p><code>of_property_count_elems_of_size</code>函数</p><p>of_property_count_elems_of_size 函数用于获取属性中元素的数量,比如<code>reg</code>属性值是一个<br>数组,那么使用此函数可以获取到这个数组的大小,此函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_property_count_elems_of_size</span><span class="params">(<span class="keyword">const</span> struct device_node *np,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> *propname, <span class="keyword">int</span> elem_size)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>np：设备节点。<br>proname：需要统计元素数量的属性名字。<br>elem_size：元素长度。<br>返回值：得到的属性元素数量。</p></li><li><p><code>of_property_read_u32_index</code>函数</p><p>of_property_read_u32_index 函数用于从属性中获取指定标号的<code>u32</code>类型数据值(无符号 32<br>位),比如某个属性有多个<code>u32</code>类型的值,那么就可以使用此函数来获取指定标号的数据值,此<br>函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_property_read_u32_index</span><span class="params">(<span class="keyword">const</span> struct device_node *np,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> *propname, u32 index,</span></span></span><br><span class="line"><span class="function"><span class="params"> u32 *out_value)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>np：设备节点。<br>proname：要读取的属性名字。<br>index：要读取的值标号。<br>out_value：读取到的值<br>返回值：0 读取成功,负值,读取失败,<code>-EINVAL</code>表示属性不存在,<code>-ENODATA</code>表示没有<br>要读取的数据,<code>-EOVERFLOW</code>表示属性值列表太小。</p></li><li><p><code>of_property_read_u8_array</code> 函数<br><code>of_property_read_u16_array</code> 函数<br><code>of_property_read_u32_array</code> 函数<br><code>of_property_read_u64_array</code> 函数</p><p>这 4 个函数分别是读取属性中 <code>u8</code>、<code>u16</code>、<code>u32</code> 和 <code>u64</code> 类型的数组数据,比如大多数的<code>reg</code>属<br>性都是数组数据,可以使用这 4 个函数一次读取出<code>reg</code>属性中的所有数据。这四个函数的原型<br>如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_property_read_u8_array</span><span class="params">(<span class="keyword">const</span> struct device_node *np,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> *propname,</span></span></span><br><span class="line"><span class="function"><span class="params"> u8 *out_values, <span class="keyword">size_t</span> sz)</span></span></span><br><span class="line"><span class="function"> </span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_property_read_u16_array</span><span class="params">(<span class="keyword">const</span> struct device_node *np,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> *propname,</span></span></span><br><span class="line"><span class="function"><span class="params"> u16 *out_values, <span class="keyword">size_t</span> sz)</span></span></span><br><span class="line"><span class="function"> </span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_property_read_u32_array</span><span class="params">(<span class="keyword">const</span> struct device_node *np,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> *propname,</span></span></span><br><span class="line"><span class="function"><span class="params"> u32 *out_values, <span class="keyword">size_t</span> sz)</span></span></span><br><span class="line"><span class="function"> </span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_property_read_u64_array</span><span class="params">(<span class="keyword">const</span> struct device_node *np,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> *propname,</span></span></span><br><span class="line"><span class="function"><span class="params"> u64 *out_values,<span class="keyword">size_t</span> sz)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>np：设备节点。<br>proname：要读取的属性名字。<br>out_value：读取到的数组值,分别为<code>u8</code>、<code>u16</code>、<code>u32</code>和<code>u64</code>。<br>sz：要读取的数组元素数量。<br>返回值：0,读取成功,负值,读取失败,<code>-EINVAL</code>表示属性不存在,<code>-ENODATA</code>表示没<br>有要读取的数据,<code>-EOVERFLOW</code>表示属性值列表太小。</p></li><li><p><code>of_property_read_u8</code> 函数<br><code>of_property_read_u16</code> 函数<br><code>of_property_read_u32</code> 函数<br><code>of_property_read_u64</code> 函数</p><p>有些属性只有一个整形值,这四个函数就是用于读取这种只有一个整形值的属性,分别用<br>于读取 u8、u16、u32 和 u64 类型属性值,函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_property_read_u8</span><span class="params">(<span class="keyword">const</span> struct device_node *np,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> *propname, u8*out_value)</span></span></span><br><span class="line"><span class="function"> </span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_property_read_u16</span><span class="params">(<span class="keyword">const</span> struct device_node *np,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> *propname, u16 *out_value)</span></span></span><br><span class="line"><span class="function"> </span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_property_read_u32</span><span class="params">(<span class="keyword">const</span> struct device_node *np,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span>*propname, u32 *out_value)</span></span></span><br><span class="line"><span class="function"> </span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_property_read_u64</span><span class="params">(<span class="keyword">const</span> struct device_node *np,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> *propname, u64 *out_value)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>np：设备节点。<br>proname：要读取的属性名字。<br>out_value：读取到的数组值。<br>返回值：0,读取成功,负值,读取失败,<code>-EINVAL</code>表示属性不存在,<code>-ENODATA</code>表示没<br>有要读取的数据,<code>-EOVERFLOW</code>表示属性值列表太小。</p></li><li><p><code>of_property_read_string</code> 函数</p><p>of_property_read_string 函数用于读取属性中字符串值,函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_property_read_string</span><span class="params">(struct device_node *np,<span class="keyword">const</span> <span class="keyword">char</span> *propname,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> **out_string)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>np：设备节点。<br>proname：要读取的属性名字。<br>out_string：读取到的字符串值。<br>返回值：0,读取成功,负值,读取失败。</p></li><li><p><code>of_n_addr_cells</code> 函数</p><p>of_n_addr_cells 函数用于获取<code>#address-cells</code>属性值,函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_n_addr_cells</span><span class="params">(struct device_node *np)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>np：设备节点。<br>返回值：获取到的<code>#address-cells</code>属性值。</p></li><li><p><code>of_n_size_cells</code> 函数</p><p>of_size_cells 函数用于获取<code>#size-cells</code>属性值,函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_n_size_cells</span><span class="params">(struct device_node *np)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>np：设备节点。<br>返回值：获取到的<code>#size-cells</code>属性值。</p></li></ul></li><li><p>其他常用of函数</p><ul><li><p><code>of_device_is_compatible</code>函数</p><p>of_device_is_compatible 函数用于查看节点的<code>compatible</code>属性是否有包含<code>compat</code>指定的字<br>符串,也就是检查设备节点的兼容性,函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_device_is_compatible</span><span class="params">(<span class="keyword">const</span> struct device_node *device,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">const</span> <span class="keyword">char</span> *compat)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>device：设备节点。<br>compat：要查看的字符串。<br>返回值： 0,节点的<code>compatible</code>属性中不包含<code>compat</code>指定的字符串;正数,节点的 <code>compatible</code><br>属性中包含<code>compat</code>指定的字符串。</p></li><li><p><code>of_get_address</code> 函数</p><p>of_get_address 函数用于获取地址相关属性,主要是<code>reg</code>或者<code>assigned-addresses</code>属性<br>值,函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">const</span> __be32 *<span class="title">of_get_address</span><span class="params">(struct device_node *dev,<span class="keyword">int</span> index,</span></span></span><br><span class="line"><span class="function"><span class="params"> u64 *<span class="built_in">size</span>, <span class="keyword">unsigned</span> <span class="keyword">int</span> *flags)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>dev：设备节点。<br>index：要读取的地址标号。<br>size：地址长度。<br>flags：参数,比如<code>IORESOURCE_IO</code>、<code>IORESOURCE_MEM</code>等<br>返回值：读取到的地址数据首地址,为<code>NULL</code>的话表示读取失败。</p></li><li><p><code>of_translate_address</code> 函数</p><p>of_translate_address 函数负责将从设备树读取到的地址转换为物理地址,函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">u64 <span class="title">of_translate_address</span><span class="params">(struct device_node *dev,<span class="keyword">const</span> __be32 *in_addr)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>dev：设备节点。<br>in_addr：要转换的地址。<br>返回值：得到的物理地址,如果为<code>OF_BAD_ADDR</code>的话表示转换失败。</p></li><li><p><code>of_address_to_resource</code> 函数</p><p><code>IIC</code>、<code>SPI</code>、<code>GPIO</code> 等这些外设都有对应的寄存器,这些寄存器其实就是一组内存空间,Linux<br>内核使用<code>resource</code>结构体来描述一段内存空间,“ resource”翻译出来就是“资源”,因此用<code>resource</code>结构体描述的都是设备资源信息,<code>resource</code>结构体定义在文件<code>include/linux/ioport.h</code>中,定义如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">resource</span> {</span></span><br><span class="line"> <span class="keyword">resource_size_t</span> start;</span><br><span class="line"> <span class="keyword">resource_size_t</span> <span class="built_in">end</span>;</span><br><span class="line"> <span class="keyword">const</span> <span class="keyword">char</span> *name;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">long</span> flags;</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">resource</span> *<span class="title">parent</span>, *<span class="title">sibling</span>, *<span class="title">child</span>;</span></span><br><span class="line">};</span><br></pre></td></tr></table></figure><p>对于 32 位的 SOC 来说,<code>resource_size_t</code>是 <code>u32</code> 类型的。其中<code>start</code>表示开始地址,<code>end</code> 表示结束地址,<code>name</code>是这个资源的名字,<code>flags</code>是资源标志位,一般表示资源类型,可选的资源标志<br>定义在文件<code>include/linux/ioport.h</code>中,如下所示:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_BITS 0x000000ff</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_TYPE_BITS 0x00001f00</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_IO 0x00000100</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_MEM 0x00000200</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_REG 0x00000300</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_IRQ 0x00000400</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_DMA 0x00000800</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_BUS 0x00001000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_PREFETCH 0x00002000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_READONLY 0x00004000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_CACHEABLE 0x00008000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_RANGELENGTH 0x00010000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_SHADOWABLE 0x00020000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_SIZEALIGN 0x00040000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_STARTALIGN 0x00080000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_MEM_64 0x00100000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_WINDOW 0x00200000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_MUXED 0x00400000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_EXCLUSIVE 0x08000000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_DISABLED 0x10000000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_UNSET 0x20000000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_AUTO 0x40000000</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IORESOURCE_BUSY 0x80000000</span></span><br></pre></td></tr></table></figure><p>一般最常见的资源标志就是<code>IORESOURCE_MEM</code>、 <code>IORESOURCE_REG</code>和<code>IORESOURCE_IRQ</code>等。接下来我们回到<code>of_address_to_resource</code>函数,此函数看名字像是从设备树里面提取资源值,但是本质上就是将<code>reg</code>属性值,然后将其转换为<code>resource</code>结构体类型,函数原型如下所示:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">of_address_to_resource</span><span class="params">(struct device_node *dev,<span class="keyword">int</span> index,</span></span></span><br><span class="line"><span class="function"><span class="params"> struct resource *r)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>dev：设备节点。<br>index：地址资源标号。<br>r：得到的<code>resource</code>类型的资源值。<br>返回值：0,成功;负值,失败。</p></li><li><p><code>of_iomap</code>函数</p><p>of_iomap 函数用于直接内存映射,以前我们会通过<code>ioremap</code>函数来完成物理地址到虚拟地<br>址的映射,采用设备树以后就可以直接通过<code>of_iomap</code>函数来获取内存地址所对应的虚拟地址,<br>不需要使用<code>ioremap</code>函数了。当然了,你也可以使用<code>ioremap</code>函数来完成物理地址到虚拟地址<br>的内存映射,只是在采用设备树以后,大部分的驱动都使用<code>of_iomap</code>函数了，<code>of_iomap</code>函数本<br>质上也是将<code>reg</code>属性中地址信息转换为虚拟地址,如果<code>reg</code>属性有多段的话,可以通过<code>index</code>参<br>数指定要完成内存映射的是哪一段,<code>of_iomap</code>函数原型如下:</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> __iomem *<span class="title">of_iomap</span><span class="params">(struct device_node *np, <span class="keyword">int</span> index)</span></span></span><br></pre></td></tr></table></figure><p>函数参数和返回值含义如下:<br>np：设备节点。<br>index：<code>reg</code>属性中要完成内存映射的段,如果<code>reg</code>属性只有一段的话<code>index</code>就设置为 0。<br>返回值：经过内存映射后的虚拟内存首地址,如果为<code>NULL</code>的话表示内存映射失败。</p></li></ul></li></ol><h2 id="九、设备树添加内容（开发中一般不使用这种方式）"><a href="#九、设备树添加内容（开发中一般不使用这种方式）" class="headerlink" title="九、设备树添加内容（开发中一般不使用这种方式）"></a>九、设备树添加内容（开发中一般不使用这种方式）</h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* 自己添加的节点 2020-9-17 */</span></span><br><span class="line">alphaled {</span><br><span class="line"> <span class="meta">#address-cells = <span class="meta-string"><1>;</span></span></span><br><span class="line"> <span class="meta">#size-cells = <span class="meta-string"><1>;</span></span></span><br><span class="line"> compatible = <span class="string">"atkalpha-led"</span>;</span><br><span class="line"> status = <span class="string">"okay"</span>;</span><br><span class="line"> reg = < <span class="number">0X020C406C</span> <span class="number">0X04</span> <span class="comment">/* CCM_CCGR1_BASE */</span></span><br><span class="line"> <span class="number">0X020E0068</span> <span class="number">0X04</span> <span class="comment">/* SW_MUX_GPIO1_IO03_BASE */</span></span><br><span class="line"> <span class="number">0X020E02F4</span> <span class="number">0X04</span> <span class="comment">/* SW_PAD_GPIO1_IO03_BASE */</span></span><br><span class="line"> <span class="number">0X0209C000</span> <span class="number">0X04</span> <span class="comment">/* GPIO1_DR_BASE */</span></span><br><span class="line"> <span class="number">0X0209C004</span> <span class="number">0X04</span> <span class="comment">/* GPIO1_GPIR_BASE */</span></span><br><span class="line"> >;</span><br><span class="line">};</span><br></pre></td></tr></table></figure><h2 id="十、驱动使用设备树例子"><a href="#十、驱动使用设备树例子" class="headerlink" title="十、驱动使用设备树例子"></a>十、驱动使用设备树例子</h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/types.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/kernel.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/delay.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/ide.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/init.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/module.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/errno.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/gpio.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/cdev.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of_address.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of_irq.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><asm/mach/map.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><asm/uaccess.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><asm/io.h></span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment"> * 入口和出口函数</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> __init <span class="title">dtsof_init</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> ret = <span class="number">0</span>;</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">device_node</span> *<span class="title">np</span> = <span class="title">NULL</span>;</span> <span class="comment">// 节点</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">property</span> *<span class="title">comppro</span> = <span class="title">NULL</span>;</span></span><br><span class="line"> <span class="keyword">const</span> <span class="keyword">char</span> *str;</span><br><span class="line"> u32 def_value = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">int</span> elesize = <span class="number">0</span>;</span><br><span class="line"> u32 *brival;</span><br><span class="line"> <span class="keyword">int</span> i;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 找到backlight节点 */</span></span><br><span class="line"> np = of_find_node_by_path(<span class="string">"/backlight"</span>);</span><br><span class="line"> <span class="keyword">if</span> (np == <span class="literal">NULL</span>)</span><br><span class="line"> {</span><br><span class="line"> ret = -EINVAL;</span><br><span class="line"> <span class="keyword">goto</span> fail_findnd;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 获取属性 */</span></span><br><span class="line"> comppro = of_find_property(np, <span class="string">"compatible"</span>, <span class="literal">NULL</span>);</span><br><span class="line"> <span class="keyword">if</span> (comppro == <span class="literal">NULL</span>)</span><br><span class="line"> {</span><br><span class="line"> ret = -EINVAL;</span><br><span class="line"> <span class="keyword">goto</span> fail_findpro;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> printk(<span class="string">"compatible=%s\r\n"</span>, (<span class="keyword">char</span> *)comppro->value);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> ret = of_property_read_string(np, <span class="string">"status"</span>, &str);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_rs;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> printk(<span class="string">"status=%s\r\n"</span>, str);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 3 获取数字属性值 */</span></span><br><span class="line"> ret = of_property_read_u32(np, <span class="string">"default-brightness-level"</span>, &def_value);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_read_u32;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> printk(<span class="string">"default-brightness-level = %d\r\n"</span>, def_value);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 获取数组类型的属性 */</span></span><br><span class="line"> elesize = of_property_count_elems_of_size(np, <span class="string">"brightness-levels"</span>, <span class="keyword">sizeof</span>(u32));</span><br><span class="line"> <span class="keyword">if</span> (elesize < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> ret = -EINVAL;</span><br><span class="line"> <span class="keyword">goto</span> fail_readele;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> printk(<span class="string">"brightness-levels elems size = %d\r\n"</span>, elesize);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 申请内存 */</span></span><br><span class="line"> brival = kmalloc(elesize * <span class="keyword">sizeof</span>(u32), GFP_KERNEL);</span><br><span class="line"> <span class="keyword">if</span> (!brival)</span><br><span class="line"> {</span><br><span class="line"> ret = -EINVAL;</span><br><span class="line"> <span class="keyword">goto</span> fail_mem;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="comment">/* 获取数组 */</span></span><br><span class="line"> ret = of_property_read_u32_array(np, <span class="string">"brightness-levels"</span>, brival, elesize);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_read32array;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">for</span> ( i = <span class="number">0</span>; i < elesize; i++)</span><br><span class="line"> {</span><br><span class="line"> printk(<span class="string">"brightness-levels[%d] = %d \r\n"</span>, i, brival[i]);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> kfree(brival);</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> ret;</span><br><span class="line"></span><br><span class="line">fail_read32array:</span><br><span class="line"> kfree(brival); <span class="comment">/* 释放内存 */</span> </span><br><span class="line">fail_mem:</span><br><span class="line">fail_readele:</span><br><span class="line">fail_read_u32:</span><br><span class="line">fail_rs:</span><br><span class="line"> str = <span class="literal">NULL</span>;</span><br><span class="line">fail_findpro:</span><br><span class="line">fail_findnd:</span><br><span class="line"> <span class="keyword">return</span> ret;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">void</span> __exit <span class="title">dtsof_exit</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 注册入口和出口函数</span></span><br><span class="line"><span class="comment"> * */</span></span><br><span class="line">module_init(dtsof_init);</span><br><span class="line">module_exit(dtsof_exit);</span><br><span class="line"></span><br><span class="line">MODULE_LICENSE(<span class="string">"GPL"</span>);</span><br><span class="line">MODULE_AUTHOR(<span class="string">"fengyuhang"</span>);</span><br></pre></td></tr></table></figure><h2 id="十一、设备树下的LED驱动实验"><a href="#十一、设备树下的LED驱动实验" class="headerlink" title="十一、设备树下的LED驱动实验"></a>十一、设备树下的LED驱动实验</h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br><span class="line">148</span><br><span class="line">149</span><br><span class="line">150</span><br><span class="line">151</span><br><span class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br><span class="line">156</span><br><span class="line">157</span><br><span class="line">158</span><br><span class="line">159</span><br><span class="line">160</span><br><span class="line">161</span><br><span class="line">162</span><br><span class="line">163</span><br><span class="line">164</span><br><span class="line">165</span><br><span class="line">166</span><br><span class="line">167</span><br><span class="line">168</span><br><span class="line">169</span><br><span class="line">170</span><br><span class="line">171</span><br><span class="line">172</span><br><span class="line">173</span><br><span class="line">174</span><br><span class="line">175</span><br><span class="line">176</span><br><span class="line">177</span><br><span class="line">178</span><br><span class="line">179</span><br><span class="line">180</span><br><span class="line">181</span><br><span class="line">182</span><br><span class="line">183</span><br><span class="line">184</span><br><span class="line">185</span><br><span class="line">186</span><br><span class="line">187</span><br><span class="line">188</span><br><span class="line">189</span><br><span class="line">190</span><br><span class="line">191</span><br><span class="line">192</span><br><span class="line">193</span><br><span class="line">194</span><br><span class="line">195</span><br><span class="line">196</span><br><span class="line">197</span><br><span class="line">198</span><br><span class="line">199</span><br><span class="line">200</span><br><span class="line">201</span><br><span class="line">202</span><br><span class="line">203</span><br><span class="line">204</span><br><span class="line">205</span><br><span class="line">206</span><br><span class="line">207</span><br><span class="line">208</span><br><span class="line">209</span><br><span class="line">210</span><br><span class="line">211</span><br><span class="line">212</span><br><span class="line">213</span><br><span class="line">214</span><br><span class="line">215</span><br><span class="line">216</span><br><span class="line">217</span><br><span class="line">218</span><br><span class="line">219</span><br><span class="line">220</span><br><span class="line">221</span><br><span class="line">222</span><br><span class="line">223</span><br><span class="line">224</span><br><span class="line">225</span><br><span class="line">226</span><br><span class="line">227</span><br><span class="line">228</span><br><span class="line">229</span><br><span class="line">230</span><br><span class="line">231</span><br><span class="line">232</span><br><span class="line">233</span><br><span class="line">234</span><br><span class="line">235</span><br><span class="line">236</span><br><span class="line">237</span><br><span class="line">238</span><br><span class="line">239</span><br><span class="line">240</span><br><span class="line">241</span><br><span class="line">242</span><br><span class="line">243</span><br><span class="line">244</span><br><span class="line">245</span><br><span class="line">246</span><br><span class="line">247</span><br><span class="line">248</span><br><span class="line">249</span><br><span class="line">250</span><br><span class="line">251</span><br><span class="line">252</span><br><span class="line">253</span><br><span class="line">254</span><br><span class="line">255</span><br><span class="line">256</span><br><span class="line">257</span><br><span class="line">258</span><br><span class="line">259</span><br><span class="line">260</span><br><span class="line">261</span><br><span class="line">262</span><br><span class="line">263</span><br><span class="line">264</span><br><span class="line">265</span><br><span class="line">266</span><br><span class="line">267</span><br><span class="line">268</span><br><span class="line">269</span><br><span class="line">270</span><br><span class="line">271</span><br><span class="line">272</span><br><span class="line">273</span><br><span class="line">274</span><br><span class="line">275</span><br><span class="line">276</span><br><span class="line">277</span><br><span class="line">278</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/types.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/kernel.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/delay.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/ide.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/init.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/module.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/errno.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/gpio.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/cdev.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of_address.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of_irq.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><asm/mach/map.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><asm/uaccess.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><asm/io.h></span></span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> DTSLED_CNT 1</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> DTSLED_NAME <span class="meta-string">"dtsled"</span></span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> LEDOFF 0</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> LEDON 1</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 虚拟地址的指针 */</span></span><br><span class="line"><span class="keyword">static</span> <span class="keyword">void</span> __iomem *CCM_CCGR1;</span><br><span class="line"><span class="keyword">static</span> <span class="keyword">void</span> __iomem *SW_MUX_GPIO1_IO03;</span><br><span class="line"><span class="keyword">static</span> <span class="keyword">void</span> __iomem *SW_PAD_GPIO1_IO03;</span><br><span class="line"><span class="keyword">static</span> <span class="keyword">void</span> __iomem *GPIO1_GDIR;</span><br><span class="line"><span class="keyword">static</span> <span class="keyword">void</span> __iomem *GPIO1_DR;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 设备结构体 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">dtsled_dev</span> {</span></span><br><span class="line"> <span class="keyword">dev_t</span> devid; <span class="comment">/* 设备号 */</span></span><br><span class="line"> <span class="keyword">int</span> major; <span class="comment">/* 主设备号 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">cdev</span> <span class="title">cdev</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">class</span> *<span class="title">class</span>;</span> <span class="comment">/* 类 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">device</span> *<span class="title">device</span>;</span> <span class="comment">/* 设备 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">device_node</span> *<span class="title">nd</span>;</span> <span class="comment">/* 设备节点 */</span></span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">dtsled_dev</span> <span class="title">dtsled</span>;</span> <span class="comment">/* LED设备 */</span></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">led_toggle</span><span class="params">(u8 state)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> u32 val = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span>(state == LEDON)</span><br><span class="line"> {</span><br><span class="line"> val = readl(GPIO1_DR);</span><br><span class="line"> val &= ~(<span class="number">1</span> << <span class="number">3</span>);</span><br><span class="line"> writel(val, GPIO1_DR); <span class="comment">// 打开LED</span></span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> val = readl(GPIO1_DR);</span><br><span class="line"> val |= (<span class="number">1</span> << <span class="number">3</span>);</span><br><span class="line"> writel(val, GPIO1_DR); <span class="comment">// 关闭LED</span></span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> <span class="title">dtsled_open</span><span class="params">(struct inode *inode, struct file *filp)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> filp->private_data = &dtsled;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">} </span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> <span class="title">dtsled_release</span><span class="params">(struct inode *inode, struct file *filp)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">dtsled_dev</span> *<span class="title">dev</span> = <span class="title">filp</span>-><span class="title">private_data</span>;</span></span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">ssize_t</span> <span class="title">dtsled_write</span><span class="params">(struct file *filp, <span class="keyword">const</span> <span class="keyword">char</span> __user *buf, <span class="keyword">size_t</span> count, <span class="keyword">loff_t</span> *ppos)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> retvalue;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> databuff[<span class="number">1</span>];</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">dtsled_dev</span> *<span class="title">dev</span> = <span class="title">filp</span>-><span class="title">private_data</span>;</span></span><br><span class="line"></span><br><span class="line"> retvalue = copy_from_user(databuff, buf, count);</span><br><span class="line"> <span class="keyword">if</span> (retvalue < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> printk(<span class="string">"kernel write failed!\r\n"</span>);</span><br><span class="line"> <span class="keyword">return</span> -EFAULT;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (databuff[<span class="number">0</span>] == LEDON)</span><br><span class="line"> {</span><br><span class="line"> led_toggle(LEDON);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> led_toggle(LEDOFF);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 字符操作设备集 */</span></span><br><span class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="class"><span class="keyword">struct</span> <span class="title">file_operations</span> <span class="title">dtsled_fops</span> = {</span></span><br><span class="line"> .owner = THIS_MODULE,</span><br><span class="line"> .<span class="built_in">write</span> = dtsled_write,</span><br><span class="line"> .<span class="built_in">open</span> = dtsled_open,</span><br><span class="line"> .<span class="built_in">release</span> = dtsled_release,</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 入口和出口 */</span></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> __init <span class="title">dtsled_init</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> ret = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">int</span> i;</span><br><span class="line"> <span class="keyword">const</span> <span class="keyword">char</span> *str;</span><br><span class="line"> u32 regdata[<span class="number">10</span>];</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">int</span> val;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 1.注册字符设备 */</span></span><br><span class="line"> <span class="comment">/* 1.1 申请设备号 */</span></span><br><span class="line"> dtsled.major = <span class="number">0</span>; <span class="comment">/* 设备号由内核分配 */</span></span><br><span class="line"> <span class="keyword">if</span> (dtsled.major)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">/* 定义了设备号 */</span></span><br><span class="line"> dtsled.devid = MKDEV(dtsled.major,<span class="number">0</span>);</span><br><span class="line"> ret = register_chrdev_region(dtsled.devid, DTSLED_CNT, DTSLED_NAME);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> <span class="comment">/* 没有给定设备号,向内核申请*/</span></span><br><span class="line"> ret = alloc_chrdev_region(&dtsled.devid, <span class="number">0</span>, DTSLED_CNT, DTSLED_NAME);</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_devid;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 1.1 添加字符设备 */</span></span><br><span class="line"> dtsled.cdev.owner = THIS_MODULE;</span><br><span class="line"> cdev_init(&dtsled.cdev, &dtsled_fops);</span><br><span class="line"> ret = cdev_add(&dtsled.cdev, dtsled.devid, DTSLED_CNT);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_cdev;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="comment">/* 3.自动创建设备节点 */</span></span><br><span class="line"> <span class="comment">/* 3.1 创建类 */</span></span><br><span class="line"> dtsled<span class="class">.<span class="keyword">class</span> = <span class="title">class_create</span>(<span class="title">THIS_MODULE</span>,<span class="title">DTSLED_NAME</span>);</span></span><br><span class="line"> <span class="keyword">if</span> (IS_ERR(dtsled.class))</span><br><span class="line"> {</span><br><span class="line"> ret = PTR_ERR(dtsled.class);</span><br><span class="line"> <span class="keyword">goto</span> fail_class;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 3.2创建设备节点 */</span></span><br><span class="line"> dtsled.device = device_create(dtsled.class, <span class="literal">NULL</span>, dtsled.devid, <span class="literal">NULL</span>, DTSLED_NAME);</span><br><span class="line"> <span class="keyword">if</span> (IS_ERR(dtsled.device))</span><br><span class="line"> {</span><br><span class="line"> ret = PTR_ERR(dtsled.device);</span><br><span class="line"> <span class="keyword">goto</span> fail_device;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 获取设备树属性内容 */</span></span><br><span class="line"> dtsled.nd = of_find_node_by_path(<span class="string">"/alphaled"</span>);</span><br><span class="line"> <span class="keyword">if</span> (dtsled.nd == <span class="literal">NULL</span>)</span><br><span class="line"> {</span><br><span class="line"> ret = -EINVAL;</span><br><span class="line"> <span class="keyword">goto</span> fail_findnd;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> ret = of_property_read_string(dtsled.nd, <span class="string">"status"</span>, &str);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_rs;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> printk(<span class="string">"status = %s\r\n"</span>, str);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> ret = of_property_read_string(dtsled.nd, <span class="string">"compatible"</span>, &str);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_rs;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> printk(<span class="string">"compatible = %s\r\n"</span>, str);</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"><span class="meta">#<span class="meta-keyword">if</span> 0</span></span><br><span class="line"> ret = of_property_read_u32_array(dtsled.nd, <span class="string">"reg"</span>, regdata, <span class="number">10</span>);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_rs;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span> </span><br><span class="line"> {</span><br><span class="line"> printk(<span class="string">"red data："</span>);</span><br><span class="line"> <span class="keyword">for</span> (i = <span class="number">0</span>; i < <span class="number">10</span>; i++)</span><br><span class="line"> {</span><br><span class="line"> printk(<span class="string">"%#x "</span>, regdata[i]);</span><br><span class="line"> }</span><br><span class="line"> printk(<span class="string">"\r\n"</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* LED初始化 */</span></span><br><span class="line"> <span class="comment">/* 地址映射 */</span></span><br><span class="line"></span><br><span class="line"> CCM_CCGR1 = ioremap(regdata[<span class="number">0</span>], regdata[<span class="number">1</span>]);</span><br><span class="line"> SW_MUX_GPIO1_IO03 = ioremap(regdata[<span class="number">2</span>], regdata[<span class="number">3</span>]);</span><br><span class="line"> SW_PAD_GPIO1_IO03 = ioremap(regdata[<span class="number">4</span>], regdata[<span class="number">5</span>]);</span><br><span class="line"> GPIO1_DR = ioremap(regdata[<span class="number">6</span>], regdata[<span class="number">7</span>]);</span><br><span class="line"> GPIO1_GDIR = ioremap(regdata[<span class="number">8</span>], regdata[<span class="number">9</span>]);</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"> <span class="comment">/* 使用of_iomap直接获取地址映射 */</span></span><br><span class="line"> CCM_CCGR1 = of_iomap(dtsled.nd, <span class="number">0</span>);</span><br><span class="line"> SW_MUX_GPIO1_IO03 = of_iomap(dtsled.nd, <span class="number">1</span>);</span><br><span class="line"> SW_PAD_GPIO1_IO03 = of_iomap(dtsled.nd, <span class="number">2</span>);</span><br><span class="line"> GPIO1_DR = of_iomap(dtsled.nd, <span class="number">3</span>);</span><br><span class="line"> GPIO1_GDIR = of_iomap(dtsled.nd, <span class="number">4</span>);</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 初始化 */</span></span><br><span class="line"> val = readl(CCM_CCGR1);</span><br><span class="line"> val &= ~(<span class="number">3</span> << <span class="number">26</span>);</span><br><span class="line"> val |= (<span class="number">3</span> << <span class="number">26</span>);</span><br><span class="line"> writel(val, CCM_CCGR1); <span class="comment">// 使能时钟</span></span><br><span class="line"></span><br><span class="line"> writel(<span class="number">0x5</span>, SW_MUX_GPIO1_IO03); <span class="comment">// 设置复用</span></span><br><span class="line"> writel(<span class="number">0x10b0</span>, SW_PAD_GPIO1_IO03); <span class="comment">// 设置电气属性</span></span><br><span class="line"> </span><br><span class="line"> val = readl(GPIO1_GDIR);</span><br><span class="line"> val |= (<span class="number">1</span> << <span class="number">3</span>);</span><br><span class="line"> writel(val, GPIO1_GDIR); <span class="comment">// 设置输出</span></span><br><span class="line"></span><br><span class="line"> val = readl(GPIO1_DR);</span><br><span class="line"> val &= ~(<span class="number">1</span> << <span class="number">3</span>);</span><br><span class="line"> writel(val, GPIO1_DR); <span class="comment">// 默认打开LED</span></span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">fail_rs:</span><br><span class="line">fail_findnd:</span><br><span class="line"> device_destroy(dtsled.class, dtsled.devid);</span><br><span class="line">fail_device:</span><br><span class="line"> class_destroy(dtsled.class);</span><br><span class="line">fail_class:</span><br><span class="line"> cdev_del(&dtsled.cdev);</span><br><span class="line">fail_cdev:</span><br><span class="line"> unregister_chrdev_region(dtsled.devid, DTSLED_CNT);</span><br><span class="line">fail_devid:</span><br><span class="line"> <span class="keyword">return</span> ret;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">void</span> __exit <span class="title">dtsled_exit</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="comment">/* 取消地址映射 */</span></span><br><span class="line"> iounmap(CCM_CCGR1);</span><br><span class="line"> iounmap(SW_MUX_GPIO1_IO03);</span><br><span class="line"> iounmap(SW_PAD_GPIO1_IO03);</span><br><span class="line"> iounmap(GPIO1_DR);</span><br><span class="line"> iounmap(GPIO1_GDIR);</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 摧毁设备 */</span></span><br><span class="line"> device_destroy(dtsled.class, dtsled.devid);</span><br><span class="line"> <span class="comment">/* 摧毁类 */</span></span><br><span class="line"> class_destroy(dtsled.class);</span><br><span class="line"> <span class="comment">/* 删除字符设备 */</span></span><br><span class="line"> cdev_del(&dtsled.cdev);</span><br><span class="line"> <span class="comment">/* 释放设备号 */</span></span><br><span class="line"> unregister_chrdev_region(dtsled.devid, DTSLED_CNT);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 注册驱动和卸载驱动 */</span></span><br><span class="line">module_init(dtsled_init);</span><br><span class="line">module_exit(dtsled_exit);</span><br><span class="line"></span><br><span class="line">MODULE_LICENSE(<span class="string">"GPL"</span>);</span><br><span class="line">MODULE_AUTHOR(<span class="string">"fengyuhang"</span>);</span><br></pre></td></tr></table></figure><h2 id="十二、测试应用程序"><a href="#十二、测试应用程序" class="headerlink" title="十二、测试应用程序"></a>十二、测试应用程序</h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><sys/types.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><sys/stat.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><fcntl.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><unistd.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><stdio.h></span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * ./ledAPP <filename> <0:1> 1 表示开灯 0 表示关灯</span></span><br><span class="line"><span class="comment"> * @param argc 应用程序参数个数</span></span><br><span class="line"><span class="comment"> * @param argv 保存的参数，字符串形式。</span></span><br><span class="line"><span class="comment"> * */</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">(<span class="keyword">int</span> argc, <span class="keyword">char</span> *argv[])</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> ret = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">int</span> fd = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">char</span> *filename;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> databuff[<span class="number">1</span>];</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> ( argc !=<span class="number">3</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"输入错误\r\n"</span>);</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> filename = argv[<span class="number">1</span>];</span><br><span class="line"></span><br><span class="line"> fd = <span class="built_in">open</span>(filename, O_RDWR);</span><br><span class="line"> <span class="keyword">if</span>(fd < <span class="number">0</span>) {</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"Error: %s\r\n"</span>,filename);</span><br><span class="line"> <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 读 */</span></span><br><span class="line"><span class="comment">/* if (atoi(argv[2]) ==1 ) // 传递过来的是字符串，需要转换成数字</span></span><br><span class="line"><span class="comment"> {</span></span><br><span class="line"><span class="comment"> ret = read(fd, readbuf, 10);</span></span><br><span class="line"><span class="comment"> if (ret < 0)</span></span><br><span class="line"><span class="comment"> {</span></span><br><span class="line"><span class="comment"> printf("read file %s failed\r\n", filename);</span></span><br><span class="line"><span class="comment"> }</span></span><br><span class="line"><span class="comment"> else</span></span><br><span class="line"><span class="comment"> {</span></span><br><span class="line"><span class="comment"> </span></span><br><span class="line"><span class="comment"> }</span></span><br><span class="line"><span class="comment"> } */</span></span><br><span class="line"> </span><br><span class="line"> databuff[<span class="number">0</span>] = atoi(argv[<span class="number">2</span>]);</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 写 */</span></span><br><span class="line"> ret = <span class="built_in">write</span>(fd, databuff, <span class="keyword">sizeof</span>(databuff));</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"LED control failed!\r\n"</span>);</span><br><span class="line"> <span class="built_in">close</span>(fd);</span><br><span class="line"> <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 关闭 */</span></span><br><span class="line"> ret = <span class="built_in">close</span>(fd);</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure><div class="declare"><ul class="post-copyright"><li><strong>本文作者：</strong> 路痴的兔子</li><li><strong>本文链接：</strong> <a href="https:/proudrabbit.gitee.io/IMX6ULL嵌入式Linux驱动学习笔记（五）.html" title="IMX6ULL嵌入式Linux驱动学习笔记（五）" target="_blank">https:/proudrabbit.gitee.io/IMX6ULL嵌入式Linux驱动学习笔记（五）.html</a></li><li><strong>版权声明： </strong>本博客所有文章除特别声明外，均采用 <a href="https://github.com/JoeyBling/hexo-theme-yilia-plus/blob/master/LICENSE" rel="external nofollow" target="_blank">MIT</a> 许可协议。转载请注明出处！</li></ul></div></div><div class="article-info article-info-index"><div class="article-tag tagcloud"><i class="icon-price-tags icon"></i><ul class="article-tag-list"><li class="article-tag-list-item"><a href="javascript:void(0)" class="js-tag article-tag-list-link color4">嵌入式</a></li><li class="article-tag-list-item"><a href="javascript:void(0)" class="js-tag article-tag-list-link color3">IMX6ULL</a></li><li class="article-tag-list-item"><a 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class="toc-link" href="#一、什么是设备树"><span class="toc-number">1.</span> <span class="toc-text">一、什么是设备树</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#二、DTS、DTB和DTC的关系"><span class="toc-number">2.</span> <span class="toc-text">二、DTS、DTB和DTC的关系</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#三、DTS基本语法"><span class="toc-number">3.</span> <span class="toc-text">三、DTS基本语法</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#四、设备树在系统中的体现"><span class="toc-number">4.</span> <span class="toc-text">四、设备树在系统中的体现</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#五、特殊节点"><span class="toc-number">5.</span> <span class="toc-text">五、特殊节点</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#六、属性"><span class="toc-number">6.</span> <span class="toc-text">六、属性</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#七、特殊的属性"><span class="toc-number">7.</span> <span class="toc-text">七、特殊的属性</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#八、Linux内核的OF操作函数"><span class="toc-number">8.</span> <span class="toc-text">八、Linux内核的OF操作函数</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#九、设备树添加内容（开发中一般不使用这种方式）"><span class="toc-number">9.</span> <span class="toc-text">九、设备树添加内容（开发中一般不使用这种方式）</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#十、驱动使用设备树例子"><span class="toc-number">10.</span> <span class="toc-text">十、驱动使用设备树例子</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#十一、设备树下的LED驱动实验"><span class="toc-number">11.</span> <span class="toc-text">十一、设备树下的LED驱动实验</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#十二、测试应用程序"><span class="toc-number">12.</span> <span class="toc-text">十二、测试应用程序</span></a></li></ol></div></span></div></div></div></aside><div id="beaudar-comment"><link rel="stylesheet" href="/lib/beaudar.css"><script 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jsonContent:
meta: false
pages: false
posts:
title: true
date: true
path: true
text: false
raw: false
content: false
slug: false
updated: false
comments: false
link: false
permalink: false
excerpt: false
categories: false
tags: true
</pre></p><li class="search-li" q-repeat="items" q-show="isShow"><a q-attr="href:path|urlformat" class="search-title"><i class="icon-quo-left icon"></i><span q-text="title"></span></a><p class="search-time"><i class="icon-calendar icon"></i> <span q-text="date|dateformat"></span></p><p class="search-tag"><i class="icon-price-tags icon"></i> <span q-repeat="tags" q-on="click:choseTag(e, name)" q-text="name|tagformat"></span></p></li></ul></section><section class="tools-section tools-section-friends" q-show="friends"><ul class="search-ul"><li class="search-li"><a href="https://blog.csdn.net/qq_37000789" target="_blank" class="search-title" title="个人博客"><i class="icon-link icon"></i> 正月点灯笼的博客</a></li><li class="search-li"><a href="https://blog.csdn.net/ld1461575230?spm=1001.2101.3001.5343&type=blog" target="_blank" class="search-title" title="个人博客"><i class="icon-link icon"></i> 哈哈哈的嘎嘎嘎的博客</a></li><li class="search-li"><a href="https://gujiakai.gitee.io/" target="_blank" class="search-title" title="个人博客"><i class="icon-link icon"></i> 摸鱼的小灰栗的博客</a></li></ul></section><section class="tools-section tools-section-me" q-show="aboutme"><div class="aboutme-wrap" id="aboutme">熟悉的技术：<br>C/C++、Python、嵌入式、ROS。<br>开源爱好者、Linux爱好者。<br>欢迎访问我的博客。hi✿(。◕ᴗ◕。)✿</div></section></div></div><div class="pswp" tabindex="-1" role="dialog" aria-hidden="true"><div class="pswp__bg"></div><div class="pswp__scroll-wrap"><div class="pswp__container"><div class="pswp__item"></div><div class="pswp__item"></div><div class="pswp__item"></div></div><div class="pswp__ui pswp__ui--hidden"><div class="pswp__top-bar"><div class="pswp__counter"></div><button class="pswp__button pswp__button--close" title="Close (Esc)"></button> <button class="pswp__button pswp__button--share" style="display:none" title="Share"></button> <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button> <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button><div class="pswp__preloader"><div class="pswp__preloader__icn"><div class="pswp__preloader__cut"><div class="pswp__preloader__donut"></div></div></div></div></div><div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap"><div class="pswp__share-tooltip"></div></div><button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)"></button> <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)"></button><div class="pswp__caption"><div class="pswp__caption__center"></div></div></div></div></div></div><script type="text/javascript" src="/plugins/TweenMax/TweenMax.min.js"></script><script type="text/javascript" src="/plugins/TweenMax/HoverImg.js"></script><script>var hoverEffect = {
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