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padmux
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<time title="创建时间：2024-08-08 14:20:05 / 修改时间：19:56:46" itemprop="dateCreated datePublished" datetime="2024-08-08T14:20:05+08:00">2024-08-08</time>
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<div class="post-body" itemprop="articleBody"><h1 id="padmux引脚复用"><a href="#padmux引脚复用" class="headerlink" title="padmux引脚复用"></a>padmux引脚复用</h1><p>对于sstar芯片。</p>
<p>pad mux dtsi文件路径为kernel/arch/arm/boot/dts/xxx-padmux.dtsi。根据项目需求，修改该文件即可设置pin脚的复用模式。</p>
<p><img src="/../image/image-20240808142459883.png" alt="image-20240808142459883"></p>
<p>第一列为pin脚名称，第二列为pin脚复用模式，参考m_stPadMuxTbl 数组中的mode选项，第三列为复用功能中具体的pin脚作用，参考<code>mdrv_puse.h</code>。</p>
<h5 id="gpio映射表"><a href="#gpio映射表" class="headerlink" title="gpio映射表"></a>gpio映射表</h5><p>每一个chip都有一个gpio-mapping-table.xlx文件，里面有相关gpio设置。</p>
<h5 id="padmux表"><a href="#padmux表" class="headerlink" title="padmux表"></a>padmux表</h5><p>每个pin脚具体的复用功能也可以见mhal_pinmux.c的m_stPadMuxTbl数组。复用关系优先级从高到低，gpio功能的优先级最低。<strong>复用某个pin脚的某个功能前要确认高优先级复用是关闭的。</strong></p>
<p><img src="/../image/image-20240808142923826.png" alt="image-20240808142923826"></p>
<figure class="highlight plaintext"><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></pre></td><td class="code"><pre><span class="line">PAD_FUART_TX： 引脚</span><br><span class="line">CHIPTOP_BANK： 寄存器地址</span><br><span class="line">REG_SR_PCK_MODE： 偏移地址</span><br><span class="line">REG_PWM0_MODE_MASK mask位</span><br><span class="line">BIT1|BIT0 对应的设置bit位</span><br><span class="line">PINMUX_FOR_PWM0_MODE_3： 模式</span><br></pre></td></tr></table></figure>
<h5 id="设置gpio9为gpio模式"><a href="#设置gpio9为gpio模式" class="headerlink" title="设置gpio9为gpio模式"></a>设置gpio9为gpio模式</h5><p><img src="/../image/image-20240808143130176.png" alt="image-20240808143130176"></p>
<p>通过读取寄存器来确认复用是否成功</p>
<h5 id="设置i2cs0为pwm模式"><a href="#设置i2cs0为pwm模式" class="headerlink" title="设置i2cs0为pwm模式"></a>设置i2cs0为pwm模式</h5><p><img src="/../image/image-20240808143231127.png" alt="image-20240808143231127"></p>
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