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<li class="toctree-l1 current"><a class="current reference internal" href="#">7. device tree</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#id1">7.1. 一、 介绍</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#dts-dtb">7.2. 二、 dts 和 dtb 相互转换</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#id2">7.3. 三、 device tree 语法格式</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#id3">7.4. 四、 device tree 模块配置</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="#id4">7.4.1. 串口配置</a></li>
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<li><span class="section-number">7. </span>device tree</li>
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<div class="section" id="device-tree">
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<h1><span class="section-number">7. </span>device tree<a class="headerlink" href="#device-tree" title="永久链接至标题">¶</a></h1>
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<div class="section" id="id1">
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<h2><span class="section-number">7.1. </span>一、 介绍<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
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<ul>
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<li><p>调试平台</p>
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<p><code class="docutils literal notranslate"><span class="pre">ubuntu18.04</span></code></p>
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</li>
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</ul>
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</div>
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<div class="section" id="dts-dtb">
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<h2><span class="section-number">7.2. </span>二、 dts 和 dtb 相互转换<a class="headerlink" href="#dts-dtb" title="永久链接至标题">¶</a></h2>
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<ul>
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<li><p>device tree 调试工具</p>
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<p><code class="docutils literal notranslate"><span class="pre">sudo</span> <span class="pre">sudo</span> <span class="pre">apt-get</span> <span class="pre">install</span> <span class="pre">device-tree-compiler</span></code></p>
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</li>
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<li><p>dts 转 dtb</p>
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<p><code class="docutils literal notranslate"><span class="pre">dtc</span> <span class="pre">-I</span> <span class="pre">dts</span> <span class="pre">-O</span> <span class="pre">dtb</span> <span class="pre">-o</span> <span class="pre">*.dtb</span> <span class="pre">*.dts</span></code></p>
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</li>
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<li><p>dtb 转 dts</p>
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<p><code class="docutils literal notranslate"><span class="pre">dtc</span> <span class="pre">-I</span> <span class="pre">dtb</span> <span class="pre">-O</span> <span class="pre">dts</span> <span class="pre">*.dtb</span> <span class="pre">-o</span> <span class="pre">*.dts</span></code></p>
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</li>
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<li><p>dtb 转数组到数组 *.c</p>
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<p><code class="docutils literal notranslate"><span class="pre">xxd</span> <span class="pre">-i</span> <span class="pre">*.dtb</span> <span class="pre">./*.c</span></code></p>
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</li>
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</ul>
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</div>
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<div class="section" id="id2">
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<h2><span class="section-number">7.3. </span>三、 device tree 语法格式<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<ul>
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<li><p>*.dts 文件开头必须采用如下所示开头
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<code class="docutils literal notranslate"><span class="pre">/dts-v1/;</span>     <span class="pre">//</span> <span class="pre">version:</span> <span class="pre">17</span>     <span class="pre">//</span> <span class="pre">last_comp_version:</span> <span class="pre">16</span>     <span class="pre">//</span> <span class="pre">boot_cpuid_phys:</span> <span class="pre">0x0</span></code></p></li>
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<li><p>16进制数组表示方法如下(注：字节间必须有一个空格，且暂时不支持换行)</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">mac</span> <span class="p">{</span>
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<span class="n">sta_mac_addr</span> <span class="o">=</span> <span class="p">[</span><span class="n">C8</span> <span class="mi">43</span> <span class="mi">57</span> <span class="mi">82</span> <span class="mi">73</span> <span class="mi">40</span><span class="p">];</span>
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<span class="n">ap_mac_addr</span> <span class="o">=</span> <span class="p">[</span><span class="n">C8</span> <span class="mi">43</span> <span class="mi">57</span> <span class="mi">82</span> <span class="mi">73</span> <span class="mi">02</span><span class="p">];</span>
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<span class="p">};</span>
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</pre></div>
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</div>
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</li>
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<li><p>字符串或者字符串数据表示方法如下</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">model</span> <span class="o">=</span> <span class="s2">"bl bl602 AVB board"</span><span class="p">;</span>
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<span class="n">compatible</span> <span class="o">=</span> <span class="s2">"bl,bl602-sample"</span><span class="p">,</span> <span class="s2">"bl,bl602-common"</span><span class="p">;</span>
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</pre></div>
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</div>
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</li>
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<li><p>32bit数据表示方法(可以使用16进制ox方式，也可使用10进制方式，字节间必须有一个空格，且暂时不支持换行)</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">pwr_table</span> <span class="o">=</span> <span class="o"><</span><span class="mh">0x4</span> <span class="mh">0x64</span><span class="o">></span>
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<span class="n">pwr_table</span> <span class="o">=</span> <span class="o"><</span><span class="mi">4</span> <span class="mi">100</span><span class="o">></span>
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</pre></div>
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</div>
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</li>
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</ul>
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</div>
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<div class="section" id="id3">
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<h2><span class="section-number">7.4. </span>四、 device tree 模块配置<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
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<div class="section" id="id4">
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<h3><span class="section-number">7.4.1. </span>串口配置<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h3>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">串口暂时仅支持配置以下功能</span>
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</pre></div>
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</div>
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<ul>
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<li><p>使能串口</p>
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<p><code class="docutils literal notranslate"><span class="pre">status</span> <span class="pre">=</span> <span class="pre">"okay";</span></code></p>
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</li>
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<li><p>关闭串口</p>
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<p>关闭串口时，余下其他引脚、波特率等配置均无效，不会初始化相关硬件</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">status</span> <span class="o">=</span> <span class="s2">"disable"</span><span class="p">;</span>
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</pre></div>
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</div>
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</li>
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<li><p>配置引脚</p>
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<p>暂时不支持配置cts和rts相关功能，故暂时<code class="docutils literal notranslate"><span class="pre">feature</span></code>中rts和cts均为<code class="docutils literal notranslate"><span class="pre">disable</span></code>。如果使用了串的tx和rx，<code class="docutils literal notranslate"><span class="pre">feature</span></code>中到tx和rx需要配置为<code class="docutils literal notranslate"><span class="pre">okay</span></code>，<code class="docutils literal notranslate"><span class="pre">pin</span></code>中的tx和rx需要选择相关引脚。</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">pin</span> <span class="p">{</span>
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<span class="n">rx</span> <span class="o">=</span> <span class="o"><</span><span class="mi">7</span><span class="o">></span><span class="p">;</span>
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<span class="n">tx</span> <span class="o">=</span> <span class="o"><</span><span class="mi">16</span><span class="o">></span><span class="p">;</span>
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<span class="p">};</span>
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<span class="n">feature</span> <span class="p">{</span>
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<span class="n">rts</span> <span class="o">=</span> <span class="s2">"disable"</span><span class="p">;</span>
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<span class="n">cts</span> <span class="o">=</span> <span class="s2">"disable"</span><span class="p">;</span>
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<span class="n">rx</span> <span class="o">=</span> <span class="s2">"okay"</span><span class="p">;</span>
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<span class="n">tx</span> <span class="o">=</span> <span class="s2">"okay"</span><span class="p">;</span>
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<span class="p">};</span>
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</pre></div>
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</div>
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</li>
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<li><p>配置波特率</p>
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<p>配置波特率参考如下，最大支持 <code class="docutils literal notranslate"><span class="pre">2000000</span> <span class="pre">bps</span></code>这里以<code class="docutils literal notranslate"><span class="pre">9600</span></code>为例</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">baudrate</span> <span class="o">=</span> <span class="o"><</span><span class="mi">9600</span><span class="o">></span><span class="p">;</span>
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</pre></div>
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</div>
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</li>
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<li><p>配置id号</p>
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<p>配置id参考如下，这里以<code class="docutils literal notranslate"><span class="pre"><0></span></code>为例</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="nb">id</span> <span class="o">=</span> <span class="o"><</span><span class="mi">0</span><span class="o">></span><span class="p">;</span>
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</pre></div>
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</div>
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</li>
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<li><p>配置设备名</p>
|
||
<p>目前串口设备名为/dev/ttyS<em>,至于</em>为当前串口id号，目前调试口使用
|
||
/dev/ttyS0</p>
|
||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">pin</span> <span class="p">{</span>
|
||
<span class="n">rx</span> <span class="o">=</span> <span class="o"><</span><span class="mi">7</span><span class="o">></span><span class="p">;</span>
|
||
<span class="n">tx</span> <span class="o">=</span> <span class="o"><</span><span class="mi">16</span><span class="o">></span><span class="p">;</span>
|
||
<span class="p">};</span>
|
||
<span class="n">feature</span> <span class="p">{</span>
|
||
<span class="n">rts</span> <span class="o">=</span> <span class="s2">"disable"</span><span class="p">;</span>
|
||
<span class="n">cts</span> <span class="o">=</span> <span class="s2">"disable"</span><span class="p">;</span>
|
||
<span class="n">rx</span> <span class="o">=</span> <span class="s2">"okay"</span><span class="p">;</span>
|
||
<span class="n">tx</span> <span class="o">=</span> <span class="s2">"okay"</span><span class="p">;</span>
|
||
<span class="p">};</span>
|
||
<span class="n">path</span> <span class="o">=</span> <span class="s2">"/dev/ttyS0"</span><span class="p">;</span>
|
||
</pre></div>
|
||
</div>
|
||
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