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<section id="usbh-net">
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<h1>usbh_net<a class="headerlink" href="#usbh-net" title="Link to this heading"></a></h1>
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<p>本节主要介绍 USB 网卡的使用，USB 网卡推荐采用 AIR780(RNDIS)，EC20(ECM/RNDIS), 手机（RNDIS）,RTL8152 USB 网卡，AX88772 USB 网卡。</p>
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<p>USB 网卡传输层面已经对接好了 LWIP 的收发接口，因此，用户只需要包含 <strong>platform/XXX/usbh_lwip.c</strong> 并根据需要开启对应的网卡类的宏即可。</p>
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<ul class="simple">
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<li><p>当前支持以下网卡类：</p></li>
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</ul>
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<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="c1">// #define CONFIG_USBHOST_PLATFORM_CDC_ECM</span>
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<span class="c1">// #define CONFIG_USBHOST_PLATFORM_CDC_RNDIS</span>
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<span class="c1">// #define CONFIG_USBHOST_PLATFORM_CDC_NCM</span>
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<span class="c1">// #define CONFIG_USBHOST_PLATFORM_ASIX</span>
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<span class="c1">// #define CONFIG_USBHOST_PLATFORM_RTL8152</span>
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<span class="c1">// #define CONFIG_USBHOST_PLATFORM_BL616</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>包含了对接 LWIP 的输入输出接口，举例如下</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="n">err_t</span><span class="w"> </span><span class="nf">usbh_cdc_ecm_linkoutput</span><span class="p">(</span><span class="k">struct</span><span class="w"> </span><span class="nc">netif</span><span class="w"> </span><span class="o">*</span><span class="n">netif</span><span class="p">,</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">pbuf</span><span class="w"> </span><span class="o">*</span><span class="n">p</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="p">(</span><span class="kt">void</span><span class="p">)</span><span class="n">netif</span><span class="p">;</span>
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<span class="w"> </span><span class="n">usbh_lwip_eth_output_common</span><span class="p">(</span><span class="n">p</span><span class="p">,</span><span class="w"> </span><span class="n">usbh_cdc_ecm_get_eth_txbuf</span><span class="p">());</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_cdc_ecm_eth_output</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">tot_len</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="k">return</span><span class="w"> </span><span class="n">ERR_BUF</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="k">return</span><span class="w"> </span><span class="n">ERR_OK</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="kt">void</span><span class="w"> </span><span class="nf">usbh_cdc_ecm_eth_input</span><span class="p">(</span><span class="kt">uint8_t</span><span class="w"> </span><span class="o">*</span><span class="n">buf</span><span class="p">,</span><span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">buflen</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="w"> </span><span class="n">usbh_lwip_eth_input_common</span><span class="p">(</span><span class="o">&</span><span class="n">g_cdc_ecm_netif</span><span class="p">,</span><span class="w"> </span><span class="n">buf</span><span class="p">,</span><span class="w"> </span><span class="n">buflen</span><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>网卡类枚举完成后，注册 netif，并且创建网卡接收线程（因此使用 RTTHREAD 时不需要使用 RTT 的接收线程模块）。</p></li>
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<li><p>必须开启 DHCP client 服务，用于从 USB 网卡获取 IP 地址。</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_cdc_ecm_run</span><span class="p">(</span><span class="k">struct</span><span class="w"> </span><span class="nc">usbh_cdc_ecm</span><span class="w"> </span><span class="o">*</span><span class="n">cdc_ecm_class</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">netif</span><span class="w"> </span><span class="o">*</span><span class="n">netif</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">&</span><span class="n">g_cdc_ecm_netif</span><span class="p">;</span>
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<span class="w"> </span><span class="n">netif</span><span class="o">-></span><span class="n">hwaddr_len</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">6</span><span class="p">;</span>
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<span class="w"> </span><span class="n">memcpy</span><span class="p">(</span><span class="n">netif</span><span class="o">-></span><span class="n">hwaddr</span><span class="p">,</span><span class="w"> </span><span class="n">cdc_ecm_class</span><span class="o">-></span><span class="n">mac</span><span class="p">,</span><span class="w"> </span><span class="mi">6</span><span class="p">);</span>
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<span class="w"> </span><span class="n">IP4_ADDR</span><span class="p">(</span><span class="o">&</span><span class="n">g_ipaddr</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">);</span>
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<span class="w"> </span><span class="n">IP4_ADDR</span><span class="p">(</span><span class="o">&</span><span class="n">g_netmask</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">);</span>
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<span class="w"> </span><span class="n">IP4_ADDR</span><span class="p">(</span><span class="o">&</span><span class="n">g_gateway</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">);</span>
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<span class="w"> </span><span class="n">netif</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">netif_add</span><span class="p">(</span><span class="n">netif</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">g_ipaddr</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">g_netmask</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">g_gateway</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">,</span><span class="w"> </span><span class="n">usbh_cdc_ecm_if_init</span><span class="p">,</span><span class="w"> </span><span class="n">tcpip_input</span><span class="p">);</span>
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<span class="w"> </span><span class="n">netif_set_default</span><span class="p">(</span><span class="n">netif</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="n">netif_is_up</span><span class="p">(</span><span class="n">netif</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">dhcp_handle</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">usb_osal_timer_create</span><span class="p">(</span><span class="s">"dhcp"</span><span class="p">,</span><span class="w"> </span><span class="mi">200</span><span class="p">,</span><span class="w"> </span><span class="n">dhcp_timeout</span><span class="p">,</span><span class="w"> </span><span class="n">netif</span><span class="p">,</span><span class="w"> </span><span class="nb">true</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">dhcp_handle</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>
|
||
<span class="w"> </span><span class="n">USB_LOG_ERR</span><span class="p">(</span><span class="s">"timer creation failed! </span><span class="se">\r\n</span><span class="s">"</span><span class="p">);</span>
|
||
<span class="w"> </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="p">}</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
|
||
<span class="w"> </span><span class="n">usb_osal_thread_create</span><span class="p">(</span><span class="s">"usbh_cdc_ecm_rx"</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_cdc_ecm_rx_thread</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">);</span>
|
||
<span class="cp">#if LWIP_DHCP</span>
|
||
<span class="w"> </span><span class="n">dhcp_start</span><span class="p">(</span><span class="n">netif</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="n">usb_osal_timer_start</span><span class="p">(</span><span class="n">dhcp_handle</span><span class="p">);</span>
|
||
<span class="cp">#endif</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<ul class="simple">
|
||
<li><p>获取到 IP 以后，就与 USB 没有关系了，直接使用 LWIP 的接口即可。</p></li>
|
||
<li><p>需要注意以下参数</p></li>
|
||
</ul>
|
||
<p>LWIP_TCPIP_CORE_LOCKING_INPUT 用于不使用 lwip 内置的 tcpip 线程，而使用 USB 自己的处理线程。</p>
|
||
<p>LWIP_TCPIP_CORE_LOCKING 在现在 lwip 版本中默认是打开的，也推荐必须打开。</p>
|
||
<p>PBUF_POOL_BUFSIZE 推荐大于1600，搭配 LWIP_TCPIP_CORE_LOCKING_INPUT 使用，因为我们提供了使用 zero mempy 的方式，使用静态 pbuf，而不是把数据 copy 到 pbuf 中。</p>
|
||
<p>TCPIP_THREAD_STACKSIZE 推荐大于 1K，防止栈溢出。</p>
|
||
<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="cp">#if LWIP_TCPIP_CORE_LOCKING_INPUT != 1</span>
|
||
<span class="cp">#warning suggest you to set LWIP_TCPIP_CORE_LOCKING_INPUT to 1, usb handles eth input with own thread</span>
|
||
<span class="cp">#endif</span>
|
||
|
||
<span class="cp">#if LWIP_TCPIP_CORE_LOCKING != 1</span>
|
||
<span class="cp">#error must set LWIP_TCPIP_CORE_LOCKING to 1</span>
|
||
<span class="cp">#endif</span>
|
||
|
||
<span class="cp">#if PBUF_POOL_BUFSIZE < 1600</span>
|
||
<span class="cp">#error PBUF_POOL_BUFSIZE must be larger than 1600</span>
|
||
<span class="cp">#endif</span>
|
||
|
||
<span class="cp">#if TCPIP_THREAD_STACKSIZE < 1024</span>
|
||
<span class="cp">#error TCPIP_THREAD_STACKSIZE must be >= 1024</span>
|
||
<span class="cp">#endif</span>
|
||
</pre></div>
|
||
</div>
|
||
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