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<p class="caption"><span class="caption-text">Developer_Environment</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../../Developer_Environment/Developer_Environment.html">1. Developer Environment</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Developer_Environment/BLFlashEnv/BLFlashEnv.html">2. BLFlashEnv</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Developer_Environment/freedom_studio/freedom_studio.html">3. Freedom Studio</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Developer_Environment/eclipse/eclipse.html">4. Eclipse</a></li>
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<p class="caption"><span class="caption-text">Examples</span></p>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../helloworld/helloworld.html">1. Helloword</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_aws/aws.html">2. aws</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_peripherals_gpio/GPIO.html">3. GPIO</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">4. UART_echo</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#id1">4.1. 总览</a></li>
<li class="toctree-l2"><a class="reference internal" href="#id2">4.2. 准备及使用步骤</a></li>
<li class="toctree-l2"><a class="reference internal" href="#id3">4.3. 应用实例</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo_peripherals_uart_ioctl/uart_ioctl.html">5. UART_ioctl</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_protocols_http/http.html">6. Http client</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_protocols_httpc/httpc.html">7. Httpc client</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_storage_psm/psm.html">8. PSM</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_storage_romfs/romfs.html">9. Romfs</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_system_cli/cli.html">10. cli</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_system_fdt/fdt.html">11. FDT</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_wifi/wifi.html">12. WiFi</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_ble/ble.html">13. BLE</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_mesh/mesh.html">14. Mesh</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_blsync_ble/blsync_ble.html">15. BLSYNC-BLE</a></li>
<li class="toctree-l1"><a class="reference internal" href="../sdk_app_easyflash_boottimes/easyflash_boottimes.html">16. Easyflash4 boot times</a></li>
</ul>
<p class="caption"><span class="caption-text">Components</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../../Components/arch.html">1. arch</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../Components/Hal_drv/gpio.html">4. GPIO</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Components/Middleware/bloop/bloop.html">5. BLOOP</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Components/Middleware/blsync/blsync.html">6. BLSYNC</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Components/Middleware/dts/devicetree.html">7. device tree</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Components/Middleware/log/blog.html">8. blog</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Components/Middleware/security/security.html">9. Security</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Components/Middleware/vfs/vfs.html">10. AOS VFS</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Components/Middleware/yloop/yloop.html">11. yloop</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../Components/Network/https/https.html">13. HTTPS</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Components/Network/tls/tls.html">14. TLS</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Components/BLE/provision_WiFi/provision_WiFi.html">15. Provision_WiFi</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../Components/BLE/ble_stack/ble_stack.html">17. BLE</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../API/sys/cronalarms.html">1. cronalarms</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../API/wifi/wifi_mgmr.html">2. Wi-Fi Manager</a></li>
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<li><span class="section-number">4. </span>UART_echo</li>
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<div class="section" id="uart-echo">
<span id="uart-echo-index"></span><h1><span class="section-number">4. </span>UART_echo<a class="headerlink" href="#uart-echo" title="永久链接至标题"></a></h1>
<div class="section" id="id1">
<h2><span class="section-number">4.1. </span>总览<a class="headerlink" href="#id1" title="永久链接至标题"></a></h2>
<p>本示例主要介绍通过UART1将收到的数据回传给发送方的过程。</p>
</div>
<div class="section" id="id2">
<h2><span class="section-number">4.2. </span>准备及使用步骤<a class="headerlink" href="#id2" title="永久链接至标题"></a></h2>
<ul class="simple">
<li><p>使用之前需要准备一个 <code class="docutils literal notranslate"><span class="pre">USB转TTL</span></code> 串口线，并配置SDK目录下 <code class="docutils literal notranslate"><span class="pre">bl_iot_sdk/tools/flash_tool/bl602/device_tree/bl_factory_params_evb_40M.dts</span></code> 文件中的 <code class="docutils literal notranslate"><span class="pre">uart</span></code> ，具体配置可以参考本例。</p></li>
</ul>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">uart</span> <span class="p">{</span>
<span class="c1">#address-cells = &lt;1&gt;;</span>
<span class="c1">#size-cells = &lt;1&gt;;</span>
<span class="n">uart</span><span class="nd">@4000A000</span> <span class="p">{</span>
<span class="n">status</span> <span class="o">=</span> <span class="s2">&quot;okay&quot;</span><span class="p">;</span>
<span class="nb">id</span> <span class="o">=</span> <span class="o">&lt;</span><span class="mi">0</span><span class="o">&gt;</span><span class="p">;</span>
<span class="n">compatible</span> <span class="o">=</span> <span class="s2">&quot;bl602_uart&quot;</span><span class="p">;</span>
<span class="n">path</span> <span class="o">=</span> <span class="s2">&quot;/dev/ttyS0&quot;</span><span class="p">;</span>
<span class="n">baudrate</span> <span class="o">=</span> <span class="o">&lt;</span><span class="mi">2000000</span><span class="o">&gt;</span><span class="p">;</span>
<span class="n">pin</span> <span class="p">{</span>
<span class="n">rx</span> <span class="o">=</span> <span class="o">&lt;</span><span class="mi">7</span><span class="o">&gt;</span><span class="p">;</span>
<span class="n">tx</span> <span class="o">=</span> <span class="o">&lt;</span><span class="mi">16</span><span class="o">&gt;</span><span class="p">;</span>
<span class="p">};</span>
<span class="n">feature</span> <span class="p">{</span>
<span class="n">tx</span> <span class="o">=</span> <span class="s2">&quot;okay&quot;</span><span class="p">;</span>
<span class="n">rx</span> <span class="o">=</span> <span class="s2">&quot;okay&quot;</span><span class="p">;</span>
<span class="n">cts</span> <span class="o">=</span> <span class="s2">&quot;disable&quot;</span><span class="p">;</span>
<span class="n">rts</span> <span class="o">=</span> <span class="s2">&quot;disable&quot;</span><span class="p">;</span>
<span class="p">};</span>
<span class="p">};</span>
<span class="n">uart</span><span class="nd">@4000A100</span> <span class="p">{</span>
<span class="n">status</span> <span class="o">=</span> <span class="s2">&quot;okay&quot;</span><span class="p">;</span>
<span class="nb">id</span> <span class="o">=</span> <span class="o">&lt;</span><span class="mi">1</span><span class="o">&gt;</span><span class="p">;</span>
<span class="n">compatible</span> <span class="o">=</span> <span class="s2">&quot;bl602_uart&quot;</span><span class="p">;</span>
<span class="n">path</span> <span class="o">=</span> <span class="s2">&quot;/dev/ttyS1&quot;</span><span class="p">;</span>
<span class="n">baudrate</span> <span class="o">=</span> <span class="o">&lt;</span><span class="mi">115200</span><span class="o">&gt;</span><span class="p">;</span>
<span class="n">pin</span> <span class="p">{</span>
<span class="n">rx</span> <span class="o">=</span> <span class="o">&lt;</span><span class="mi">3</span><span class="o">&gt;</span><span class="p">;</span>
<span class="n">tx</span> <span class="o">=</span> <span class="o">&lt;</span><span class="mi">4</span><span class="o">&gt;</span><span class="p">;</span>
<span class="p">};</span>
<span class="n">feature</span> <span class="p">{</span>
<span class="n">tx</span> <span class="o">=</span> <span class="s2">&quot;okay&quot;</span><span class="p">;</span>
<span class="n">rx</span> <span class="o">=</span> <span class="s2">&quot;okay&quot;</span><span class="p">;</span>
<span class="n">cts</span> <span class="o">=</span> <span class="s2">&quot;disable&quot;</span><span class="p">;</span>
<span class="n">rts</span> <span class="o">=</span> <span class="s2">&quot;disable&quot;</span><span class="p">;</span>
<span class="p">};</span>
<span class="p">};</span>
<span class="p">};</span>
</pre></div>
</div>
<ul class="simple">
<li><p>使用步骤：</p></li>
</ul>
<blockquote>
<div><ul class="simple">
<li><p>将板子的 <code class="docutils literal notranslate"><span class="pre">gpio3</span></code> 和 <code class="docutils literal notranslate"><span class="pre">gpio4</span></code> 和 <code class="docutils literal notranslate"><span class="pre">GND</span></code> 分别与 <code class="docutils literal notranslate"><span class="pre">USB转TTL</span></code> 串口线的 <code class="docutils literal notranslate"><span class="pre">TXD</span></code> 、 <code class="docutils literal notranslate"><span class="pre">RXD</span></code> 、 <code class="docutils literal notranslate"><span class="pre">GND</span></code> 分别连接起来；</p></li>
<li><p>编译 <code class="docutils literal notranslate"><span class="pre">customer_app/sdk_app_uart_echo</span></code> 工程并下载工程；</p></li>
<li><p>打开一个串口终端窗口A（波特率为115200，用于接收和发送uart消息），打开另一个串口终端窗口B（波特率为2000000，用于打印log）。板子上电可以看到窗口A接收到 <code class="docutils literal notranslate"><span class="pre">1234567890abcdefg</span></code> ，窗口B打印的log 停止在 <code class="docutils literal notranslate"><span class="pre">send</span> <span class="pre">case</span></code> 处，在A窗口中输入 <code class="docutils literal notranslate"><span class="pre">1234567890abcdefg</span></code> （没有回显）可以在B串口看到 <code class="docutils literal notranslate"><span class="pre">recv</span> <span class="pre">case</span></code> 和 <code class="docutils literal notranslate"><span class="pre">end</span></code> 的消息，此时说明演示成功。</p></li>
</ul>
</div></blockquote>
<div class="figure align-default">
<img alt="" src="../../_images/image114.png" />
</div>
<div class="figure align-default">
<img alt="" src="../../_images/image213.png" />
</div>
</div>
<div class="section" id="id3">
<h2><span class="section-number">4.3. </span>应用实例<a class="headerlink" href="#id3" title="永久链接至标题"></a></h2>
<ul class="simple">
<li><p>调用 <code class="docutils literal notranslate"><span class="pre">aos_write()</span></code> 接口通过UART1给终端发送数据，并等待终端返回接收到的数据，如接收与发送的数据一致，则log口将打印UART1中收发的消息内容。</p></li>
</ul>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">aos_write</span><span class="p">(</span><span class="n">fd</span><span class="p">,</span> <span class="n">send_recv_log</span><span class="p">,</span> <span class="n">strlen</span><span class="p">(</span><span class="n">send_recv_log</span><span class="p">));</span>
<span class="n">log_step</span><span class="p">(</span><span class="n">ci_table_step_send</span><span class="p">);</span>
<span class="k">while</span> <span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
<span class="n">length</span> <span class="o">=</span> <span class="n">aos_read</span><span class="p">(</span><span class="n">fd</span><span class="p">,</span> <span class="n">buf_recv</span><span class="p">,</span> <span class="n">strlen</span><span class="p">(</span><span class="n">send_recv_log</span><span class="p">));</span>
<span class="k">if</span> <span class="p">(</span><span class="n">length</span> <span class="o">!=</span> <span class="n">strlen</span><span class="p">(</span><span class="n">send_recv_log</span><span class="p">))</span> <span class="p">{</span>
<span class="k">continue</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">memcmp</span><span class="p">(</span><span class="n">buf_recv</span><span class="p">,</span> <span class="n">send_recv_log</span><span class="p">,</span> <span class="n">strlen</span><span class="p">(</span><span class="n">send_recv_log</span><span class="p">))</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">printf</span><span class="p">(</span><span class="s2">&quot;recvbuff:</span><span class="si">%s</span><span class="se">\r\n</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">send_recv_log</span><span class="p">);</span>
<span class="n">log_step</span><span class="p">(</span><span class="n">ci_table_step_recv</span><span class="p">);</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">vTaskDelay</span><span class="p">(</span><span class="mi">10</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">log_step</span><span class="p">(</span><span class="n">ci_table_step_end</span><span class="p">);</span>
</pre></div>
</div>
<ul class="simple">
<li><p>在 <code class="docutils literal notranslate"><span class="pre">customer_app/sdk_app_uart_echo/sdk_app_uart_echo/main.c</span></code> 中 <code class="docutils literal notranslate"><span class="pre">static</span> <span class="pre">void</span> <span class="pre">aos_loop_proc(void</span> <span class="pre">*pvParameters)</span></code> 函数里调用ci_loop_proc()函数创建 <code class="docutils literal notranslate"><span class="pre">uart_echo</span></code> 的任务。</p></li>
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