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<section id="usb">
<h1>USB 极限速度测试<a class="headerlink" href="#usb" title="Link to this heading"></a></h1>
<p>在 tools 中我们提供了一个 USB 极限速度测试工具，帮助用户测试 USB 设备的传输速度。该工具可以测量 USB 设备在不同条件下的读写速度，并生成详细的测试报告。</p>
<ul class="simple">
<li><p>test_cdc_speed.c + libusb_winusb_device_for_speed.c</p></li>
</ul>
<p>该工具主要使用 libusb 进行测试，因此，需要保证本地文件需要有 libusb 库和头文件，device 使用 winusb，因为如果使用 cdc acm，则需要进行驱动转换。使用如下：</p>
<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="cp">#默认已经提供 test_cdc_speed.exe</span>
<span class="n">gcc</span><span class="w"> </span><span class="o">-</span><span class="n">O2</span><span class="w"> </span><span class="o">-</span><span class="n">o</span><span class="w"> </span><span class="n">test_cdc_speed</span><span class="p">.</span><span class="n">exe</span><span class="w"> </span><span class="p">.</span><span class="err">\</span><span class="n">test_cdc_speed</span><span class="p">.</span><span class="n">c</span><span class="w"> </span><span class="p">.</span><span class="err">\</span><span class="n">libusb</span><span class="mf">-1.0</span><span class="p">.</span><span class="n">dll</span><span class="p">.</span><span class="n">a</span><span class="w"> </span><span class="o">-</span><span class="n">I</span><span class="p">.</span><span class="w"> </span><span class="o">-</span><span class="n">lm</span>
<span class="p">.</span><span class="err">\</span><span class="n">test_cdc_speed</span><span class="p">.</span><span class="n">exe</span><span class="w"> </span><span class="o">--</span><span class="n">vendor</span><span class="w"> </span><span class="mh">0xFFFF</span><span class="w"> </span><span class="o">--</span><span class="n">product</span><span class="w"> </span><span class="mh">0xFFFF</span><span class="w"> </span><span class="o">--</span><span class="n">interface</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="o">--</span><span class="n">mode</span><span class="w"> </span><span class="n">tx</span><span class="w"> </span><span class="o">--</span><span class="n">chunk</span><span class="o">-</span><span class="n">length</span><span class="w"> </span><span class="mi">4</span><span class="n">M</span>
<span class="p">.</span><span class="err">\</span><span class="n">test_cdc_speed</span><span class="p">.</span><span class="n">exe</span><span class="w"> </span><span class="o">--</span><span class="n">vendor</span><span class="w"> </span><span class="mh">0xFFFF</span><span class="w"> </span><span class="o">--</span><span class="n">product</span><span class="w"> </span><span class="mh">0xFFFF</span><span class="w"> </span><span class="o">--</span><span class="n">interface</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="o">--</span><span class="n">mode</span><span class="w"> </span><span class="n">rx</span><span class="w"> </span><span class="o">--</span><span class="n">chunk</span><span class="o">-</span><span class="n">length</span><span class="w"> </span><span class="mi">4</span><span class="n">M</span>
</pre></div>
</div>
<ul class="simple">
<li><p>test_cdc_speed.py</p></li>
</ul>
<p>该工具主要使用 pyserial 进行测试，因此，需要保证已经安装 pyserial 库。使用如下：</p>
<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="n">python</span><span class="w"> </span><span class="n">test_cdc_speed</span><span class="p">.</span><span class="n">py</span><span class="w"> </span><span class="o">--</span><span class="n">port</span><span class="w"> </span><span class="n">COM6</span><span class="w"> </span><span class="o">--</span><span class="n">mode</span><span class="w"> </span><span class="n">tx</span><span class="w"> </span><span class="o">--</span><span class="n">chunk</span><span class="o">-</span><span class="n">length</span><span class="w"> </span><span class="mi">4</span><span class="n">M</span>
<span class="n">python</span><span class="w"> </span><span class="n">test_cdc_speed</span><span class="p">.</span><span class="n">py</span><span class="w"> </span><span class="o">--</span><span class="n">port</span><span class="w"> </span><span class="n">COM6</span><span class="w"> </span><span class="o">--</span><span class="n">mode</span><span class="w"> </span><span class="n">rx</span><span class="w"> </span><span class="o">--</span><span class="n">chunk</span><span class="o">-</span><span class="n">length</span><span class="w"> </span><span class="mi">4</span><span class="n">M</span>
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>python 测试 TX 和 libusb 基本相同，rx 会略低于 libusb，主要原因是因为 pyserial 读取后会放到缓存中，多一次拷贝导致</p>
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