1 files changed, 17 insertions, 2 deletions
diff --git a/api/api_device.html b/api/api_device.html
index 82c0fd84..345c1cd0 100644
--- a/api/api_device.html
+++ b/api/api_device.html
@@ -51,6 +51,7 @@
 <li class="toctree-l1"><a class="reference internal" href="../quick_start/q%26a.html">Q &amp; A</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../quick_start/migration.html">部分改动迁移指南</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../quick_start/opensource.html">基于 CherryUSB 的开源项目</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../quick_start/usb_speed.html">USB 极限速度测试</a></li>
 </ul>
 <p class="caption" role="heading"><span class="caption-text">USB 基本知识点</span></p>
 <ul>
@@ -100,6 +101,7 @@
 <li class="toctree-l3"><a class="reference internal" href="#usbd-audio-close">usbd_audio_close</a></li>
 <li class="toctree-l3"><a class="reference internal" href="#usbd-audio-set-mute">usbd_audio_set_mute</a></li>
 <li class="toctree-l3"><a class="reference internal" href="#usbd-audio-set-volume">usbd_audio_set_volume</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#usbd-audio-get-volume">usbd_audio_get_volume</a></li>
 <li class="toctree-l3"><a class="reference internal" href="#usbd-audio-set-sampling-freq">usbd_audio_set_sampling_freq</a></li>
 <li class="toctree-l3"><a class="reference internal" href="#usbd-audio-get-sampling-freq-table">usbd_audio_get_sampling_freq_table</a></li>
 </ul>
@@ -583,14 +585,27 @@ bos描述符，winusb 描述符。</p>
 <section id="usbd-audio-set-volume">
 <h3>usbd_audio_set_volume<a class="headerlink" href="#usbd-audio-set-volume" title="Link to this heading"></a></h3>
 <p><code class="docutils literal notranslate"><span class="pre">usbd_audio_set_volume</span></code>  用来设置音量。</p>
-<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="kt">void</span><span class="w"> </span><span class="nf">usbd_audio_set_volume</span><span class="p">(</span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">busid</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">ep</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">ch</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">volume_db</span><span class="p">);</span>
+<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="kt">void</span><span class="w"> </span><span class="nf">usbd_audio_set_volume</span><span class="p">(</span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">busid</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">ep</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">ch</span><span class="p">,</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">volume_db</span><span class="p">);</span>
 </pre></div>
 </div>
 <ul class="simple">
 <li><p><strong>busid</strong> USB 总线 id</p></li>
 <li><p><strong>ep</strong> 要设置音量的端点</p></li>
 <li><p><strong>ch</strong> 要设置音量的通道</p></li>
-<li><p><strong>volume_db</strong> 要设置音量的分贝，单位 -100dB ~ 0dB</p></li>
+<li><p><strong>volume_db</strong> 要设置音量的 dB，默认范围 -100 ~ 0</p></li>
+</ul>
+</section>
+<section id="usbd-audio-get-volume">
+<h3>usbd_audio_get_volume<a class="headerlink" href="#usbd-audio-get-volume" title="Link to this heading"></a></h3>
+<p><code class="docutils literal notranslate"><span class="pre">usbd_audio_get_volume</span></code>  用来获取音量。</p>
+<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="kt">float</span><span class="w"> </span><span class="nf">usbd_audio_get_volume</span><span class="p">(</span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">busid</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">ep</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">ch</span><span class="p">);</span>
+</pre></div>
+</div>
+<ul class="simple">
+<li><p><strong>busid</strong> USB 总线 id</p></li>
+<li><p><strong>ep</strong> 要获取音量的端点</p></li>
+<li><p><strong>ch</strong> 要获取音量的通道</p></li>
+<li><p><strong>返回</strong> 音量的 dB，默认范围 -100 ~ 0</p></li>
 </ul>
 </section>
 <section id="usbd-audio-set-sampling-freq">