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286 lines
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<p class="caption" role="heading"><span class="caption-text">例程说明</span></p>
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<ul class="current">
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<li class="toctree-l1"><a class="reference internal" href="usbd_cdc_acm.html">usbd_cdc_acm</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usbd_hid.html">usbd_hid</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usbd_winusb.html">usbd_winusb</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usbd_webusb.html">usbd_webusb</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usbd_adb.html">usbd_adb</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">usbh_serial</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usbh_hid.html">usbh_hid</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usbh_msc.html">usbh_msc</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usbh_net.html">usbh_net</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usbh_bluetooth.html">usbh_bluetooth</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usbh_wifi.html">usbh_wifi</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usbd_vendor.html">vendor device 驱动编写</a></li>
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<li class="toctree-l1"><a class="reference internal" href="usb_otg.html">OTG 功能的使用</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">USBIP 介绍</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/ohci.html">OHCI</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/ehci.html">EHCI</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/xhci.html">XHCI</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/chipidea.html">CHIPIDEA</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/dwc2.html">DWC2</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/musb.html">MUSB</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/fotg210.html">FOTG210</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/cdns2.html">CDNS2</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/cdns3.html">CDNS3</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/dwc3.html">DWC3</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">工具使用</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../tools/index.html">chryusb_configurator</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../tools/index.html#usb-protocol-suite">力科 USB Protocol Suite</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../tools/index.html#wireshark">Wireshark</a></li>
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<p class="caption" role="heading"><span class="caption-text">版本说明</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../version.html">版本说明</a></li>
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<p class="caption" role="heading"><span class="caption-text">性能展示</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../show/index.html">性能展示</a></li>
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<section id="usbh-serial">
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<h1>usbh_serial<a class="headerlink" href="#usbh-serial" title="Link to this heading"></a></h1>
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<p>Serial 框架当前支持 cdc acm, ftdi, cp210x, ch34x, pl2303，gsm 驱动。当前支持两种使用方式，
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一种是使用源生 CherryUSB usbhost serial API 进行操作，另一种是基于平台封装的 API 操作，比如 rt-thread device API。，nuttx posix API。</p>
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<p>下面演示的是使用 CherryUSB usbhost serial API 进行串口回环测试，并且使用阻塞发送，异步读取的方式：</p>
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<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_serial</span><span class="w"> </span><span class="o">*</span><span class="n">serial</span><span class="p">;</span>
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<span class="n">serial</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">usbh_serial_open</span><span class="p">(</span><span class="s">"/dev/ttyACM0"</span><span class="p">,</span><span class="w"> </span><span class="n">USBH_SERIAL_O_RDWR</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">USBH_SERIAL_O_NONBLOCK</span><span class="p">);</span>
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<span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">serial</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="nb">NULL</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="n">serial</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">usbh_serial_open</span><span class="p">(</span><span class="s">"/dev/ttyUSB0"</span><span class="p">,</span><span class="w"> </span><span class="n">USBH_SERIAL_O_RDWR</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">USBH_SERIAL_O_NONBLOCK</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">serial</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="nb">NULL</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">"no serial device found</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="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="p">}</span>
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<span class="k">struct</span><span class="w"> </span><span class="nc">usbh_serial_termios</span><span class="w"> </span><span class="n">termios</span><span class="p">;</span>
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<span class="n">memset</span><span class="p">(</span><span class="o">&</span><span class="n">termios</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="k">sizeof</span><span class="p">(</span><span class="n">termios</span><span class="p">));</span>
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<span class="n">termios</span><span class="p">.</span><span class="n">baudrate</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">115200</span><span class="p">;</span>
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<span class="n">termios</span><span class="p">.</span><span class="n">stopbits</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
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<span class="n">termios</span><span class="p">.</span><span class="n">parity</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
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<span class="n">termios</span><span class="p">.</span><span class="n">databits</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">8</span><span class="p">;</span>
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<span class="n">termios</span><span class="p">.</span><span class="n">rtscts</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
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<span class="n">termios</span><span class="p">.</span><span class="n">rx_timeout</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
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<span class="n">ret</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">usbh_serial_control</span><span class="p">(</span><span class="n">serial</span><span class="p">,</span><span class="w"> </span><span class="n">USBH_SERIAL_CMD_SET_ATTR</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">termios</span><span class="p">);</span>
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<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">"set serial attr 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_with_close</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="n">serial_tx_bytes</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
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<span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="cm">/* for common, we use timeout with 0xffffffff, this is just a test */</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_serial_write</span><span class="p">(</span><span class="n">serial</span><span class="p">,</span><span class="w"> </span><span class="n">serial_tx_buffer</span><span class="p">,</span><span class="w"> </span><span class="k">sizeof</span><span class="p">(</span><span class="n">serial_tx_buffer</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">"serial write 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_with_close</span><span class="p">;</span>
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<span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="n">serial_tx_bytes</span><span class="w"> </span><span class="o">+=</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">if</span><span class="w"> </span><span class="p">(</span><span class="n">serial_tx_bytes</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">SERIAL_TEST_LEN</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">"send over</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="k">break</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="p">}</span>
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<span class="p">}</span>
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<span class="k">volatile</span><span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">wait_timeout</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
|
||
<span class="n">serial_rx_bytes</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
|
||
<span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<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_serial_read</span><span class="p">(</span><span class="n">serial</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">serial_rx_data</span><span class="p">[</span><span class="n">serial_rx_bytes</span><span class="p">],</span><span class="w"> </span><span class="n">SERIAL_TEST_LEN</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">serial_rx_bytes</span><span class="p">);</span>
|
||
<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>
|
||
<span class="w"> </span><span class="n">USB_LOG_RAW</span><span class="p">(</span><span class="s">"serial read 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>
|
||
<span class="w"> </span><span class="k">goto</span><span class="w"> </span><span class="n">delete_with_close</span><span class="p">;</span>
|
||
<span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="n">serial_rx_bytes</span><span class="w"> </span><span class="o">+=</span><span class="w"> </span><span class="n">ret</span><span class="p">;</span>
|
||
|
||
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">serial_rx_bytes</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">SERIAL_TEST_LEN</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="n">USB_LOG_RAW</span><span class="p">(</span><span class="s">"receive over</span><span class="se">\r\n</span><span class="s">"</span><span class="p">);</span>
|
||
<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="n">SERIAL_TEST_LEN</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>
|
||
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">serial_rx_data</span><span class="p">[</span><span class="n">i</span><span class="p">]</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="mh">0xa5</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="n">USB_LOG_RAW</span><span class="p">(</span><span class="s">"serial loopback data error at index %d, data: 0x%02x</span><span class="se">\r\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="p">(</span><span class="kt">unsigned</span><span class="w"> </span><span class="kt">int</span><span class="p">)</span><span class="n">i</span><span class="p">,</span><span class="w"> </span><span class="n">serial_rx_data</span><span class="p">[</span><span class="n">i</span><span class="p">]);</span>
|
||
<span class="w"> </span><span class="k">goto</span><span class="w"> </span><span class="n">delete_with_close</span><span class="p">;</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="n">USB_LOG_RAW</span><span class="p">(</span><span class="s">"serial loopback test success</span><span class="se">\r\n</span><span class="s">"</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="k">break</span><span class="p">;</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="n">wait_timeout</span><span class="o">++</span><span class="p">;</span>
|
||
|
||
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">wait_timeout</span><span class="w"> </span><span class="o">></span><span class="w"> </span><span class="mi">500</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="c1">// 5s</span>
|
||
<span class="w"> </span><span class="n">USB_LOG_RAW</span><span class="p">(</span><span class="s">"serial read timeout</span><span class="se">\r\n</span><span class="s">"</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="k">goto</span><span class="w"> </span><span class="n">delete_with_close</span><span class="p">;</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
|
||
<span class="w"> </span><span class="n">usb_osal_msleep</span><span class="p">(</span><span class="mi">10</span><span class="p">);</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="n">usbh_serial_close</span><span class="p">(</span><span class="n">serial</span><span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>需要注意，例程中使用的是比较简单的先发送后读取的方式，因此发送的总长度不可以超过 CONFIG_USBHOST_SERIAL_RX_SIZE，正常使用 TX/RX 请分开进行。</p>
|
||
</div>
|
||
<p>用户需要考虑以下三种场景：</p>
|
||
<ul class="simple">
|
||
<li><p>USB2TTL 设备 + 启用了波特率，这种情况下需要使用 <cite>usbh_serial_write</cite> 和 <cite>usbh_serial_read</cite> 进行收发数据， <strong>并且 read 操作需要及时，防止 ringbuf 数据溢出而丢包</strong>；</p></li>
|
||
<li><p>纯 USB 设备 + 未启动波特率，这种情况下可以使用 <cite>usbh_serial_cdc_write_async</cite> 和 <cite>usbh_serial_cdc_read_async</cite> 进行异步收发数据。阻塞则可以用 <cite>usbh_serial_write</cite> ，不可以使用 <cite>usbh_serial_read</cite>。</p></li>
|
||
<li><p>纯 USB 设备 + 启动波特率，同 1，但是速率打折扣（因为多了一层 ringbuf）。此时也不可以使用 <cite>usbh_serial_cdc_write_async</cite> 和 <cite>usbh_serial_cdc_read_async</cite>。 <strong>如果是 GSM 设备请使用第一种场景</strong>。</p></li>
|
||
</ul>
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