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<section id="usbh-msc">
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<h1>usbh_msc<a class="headerlink" href="#usbh-msc" title="Link to this heading"></a></h1>
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<p>本节主要介绍主机 MSC 使用。借助 FATFS 实现读写功能。</p>
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<ul class="simple">
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<li><p>在 msc 枚举完成的回调中注册一个线程，用于读写操作。</p></li>
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</ul>
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<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="kt">void</span><span class="w"> </span><span class="nf">usbh_msc_run</span><span class="p">(</span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_msc</span><span class="w"> </span><span class="o">*</span><span class="n">msc_class</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="w"> </span><span class="n">usb_osal_thread_create</span><span class="p">(</span><span class="s">"usbh_msc"</span><span class="p">,</span><span class="w"> </span><span class="mi">2048</span><span class="p">,</span><span class="w"> </span><span class="n">CONFIG_USBHOST_PSC_PRIO</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">usbh_msc_thread</span><span class="p">,</span><span class="w"> </span><span class="n">msc_class</span><span class="p">);</span>
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<span class="p">}</span>
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<span class="kt">void</span><span class="w"> </span><span class="nf">usbh_msc_stop</span><span class="p">(</span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_msc</span><span class="w"> </span><span class="o">*</span><span class="n">msc_class</span><span class="p">)</span>
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<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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<ul class="simple">
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<li><p>不使用 fatfs，则直接使用 usbh_msc_scsi_read10 或者 usbh_msc_scsi_write10 函数进行读写操作。</p></li>
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<li><p>如果使用 fatfs，则需要在 usbh_msc_thread 中调用 fatfs 的接口进行读写操作。msc读写适配fatfs 参考 <cite>platform/none/usbh_fatfs.c</cite></p></li>
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</ul>
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<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">usbh_msc_thread</span><span class="p">(</span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">argument</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">ret</span><span class="p">;</span>
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<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_msc</span><span class="w"> </span><span class="o">*</span><span class="n">msc_class</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_msc</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="n">argument</span><span class="p">;</span>
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<span class="w"> </span><span class="cm">/* test with only one buffer, if you have more msc class, modify by yourself */</span>
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<span class="cp">#if 1</span>
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<span class="w"> </span><span class="cm">/* get the partition table */</span>
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<span class="w"> </span><span class="n">ret</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">usbh_msc_scsi_read10</span><span class="p">(</span><span class="n">msc_class</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="n">partition_table</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">);</span>
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<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">ret</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="n">USB_LOG_RAW</span><span class="p">(</span><span class="s">"scsi_read10 error,ret:%d</span><span class="se">\r\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">ret</span><span class="p">);</span>
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<span class="w"> </span><span class="k">goto</span><span class="w"> </span><span class="n">delete</span><span class="p">;</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="mi">512</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">++</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">i</span><span class="w"> </span><span class="o">%</span><span class="w"> </span><span class="mi">16</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="n">USB_LOG_RAW</span><span class="p">(</span><span class="s">"</span><span class="se">\r\n</span><span class="s">"</span><span class="p">);</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="w"> </span><span class="n">USB_LOG_RAW</span><span class="p">(</span><span class="s">"%02x "</span><span class="p">,</span><span class="w"> </span><span class="n">partition_table</span><span class="p">[</span><span class="n">i</span><span class="p">]);</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="w"> </span><span class="n">USB_LOG_RAW</span><span class="p">(</span><span class="s">"</span><span class="se">\r\n</span><span class="s">"</span><span class="p">);</span>
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<span class="cp">#endif</span>
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<span class="cp">#if TEST_USBH_MSC_FATFS</span>
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<span class="w"> </span><span class="n">usb_msc_fatfs_test</span><span class="p">();</span>
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<span class="cp">#endif</span>
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<span class="w"> </span><span class="c1">// clang-format off</span>
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<span class="nl">delete</span><span class="p">:</span>
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<span class="w"> </span><span class="n">usb_osal_thread_delete</span><span class="p">(</span><span class="nb">NULL</span><span class="p">);</span>
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<span class="w"> </span><span class="c1">// clang-format on</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<ul class="simple">
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<li><p>最后处理完成或者失败后，删除线程。</p></li>
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