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linux下利用dnw烧写文件
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<p>感谢牛人的分享，linux下利用dnw烧写文件<br>如果在ubuntu下搞开发，又要回到windows下用dnw下载文件，的确很烦人，下面就是解决的方法。</p>
<ol>
<li><p>下载Linux下DNW的PC端USB驱动和写入工具 下载地址：<code>https://www.mak-blog.com/download/dnw_linux.tar.gz</code>，文件名: <code>dnw_linux.tar.gz</code></p>
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<li><p>编译PC端USB驱动和写入工具</p>
<ol>
<li>解压缩<br><code>$ tar xzvf /path/to/dnw_linux.tgz</code><br>有以下文件<br>dnw_linux/<br>dnw_linux/secbulk/<br>dnw_linux/secbulk/Makefile<br>dnw_linux/secbulk/secbulk.c<br>dnw_linux/dnw/<br>dnw_linux/dnw/dnw.c<br>其中<code>secbulk.c</code>是PC端USB驱动, <code>dnw.c</code>是写入工具</li>
<li>编译并加载<code>secbulk.c</code>内核模块<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">$cd secbulk</span><br><span class="line">$make -C /lib/modules/`uname -r`/build M=`pwd` modules //编译不过就修改参数</span><br></pre></td></tr></table></figure>
编译成功后在当前目录下可以看到<code>secbulk.ko</code><br>用insmod命令加载模块，这需要root权限<br><code>$sudo insmod ./secbulk.ko</code><br>加载后用dmesg命令可以看到模块已经成功加载<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">[ 238.007970] secbulk:secbulk loaded</span><br><span class="line">[ 238.009101] usbcore: registered new interface driver secbulk</span><br></pre></td></tr></table></figure></li>
<li>编译dnw写入工具<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">$cd dnw</span><br><span class="line">$gcc -o dnw dnw.c</span><br></pre></td></tr></table></figure>
编译成功后生成可执行档dnw</li>
</ol>
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<li><p>使用DNW下载</p>
<ol>
<li>启动开发板，进入kermit，并将开发板和PC用USB电缆连接，先加载secbulk驱动：</li>
<li>当出现“USB host is connected. Waiting a download.”时，在PC端Linux上用dnw工具写入要下载的文件<br>切换到root权限，执行dnw下载.<br><code>$./dnw /path/to/what/you/want/download</code><br>写入完成后提示成功<br>100% xxxxxxx bytes OK<br>如果发现速度太慢了，可以修改缓冲区的大小。在源码中<br>发现是<code>#define BULKOUT_BUFFER_SIZE 32</code>所设定的值太小了。<br>改为<code>#define BULKOUT_BUFFER_SIZE 512</code>后可发现速度快了很多。<br>改了缓冲区大小之后，速度会快很多，设多少自己把握。 </li>
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<blockquote>
<p>原文地址：<a href="http://blog.chinaunix.net/u3/93598/showart_2133626.html" target="_blank" rel="noopener">http://blog.chinaunix.net/u3/93598/showart_2133626.html</a></p>
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