{"id":58468,"date":"2025-08-16T11:04:59","date_gmt":"2025-08-16T03:04:59","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/58468.html"},"modified":"2025-08-16T11:04:59","modified_gmt":"2025-08-16T03:04:59","slug":"linux%e5%ad%97%e7%ac%a6%e8%ae%be%e5%a4%87%e9%a9%b1%e5%8a%a8%e5%bc%80%e5%8f%91%e5%ae%8c%e5%85%a8%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/58468.html","title":{"rendered":"Linux\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u5f00\u53d1\u5b8c\u5168\u6307\u5357"},"content":{"rendered":"

Linux\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u5f00\u53d1\u5b8c\u5168\u6307\u5357<\/h4>\n

\u2014\u2014\u4ece\u7406\u8bba\u5230\u5b9e\u6218\u7684\u5b8c\u6574\u6846\u67b6\u89e3\u6790<\/p>\n

\n

📚 \u76ee\u5f55<\/h5>\n
  • \u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u6838\u5fc3\u6982\u5ff5<\/li>\n
  • \u8bbe\u5907\u53f7\u7ba1\u7406\u673a\u5236<\/li>\n
  • \u9a71\u52a8\u6846\u67b6\u642d\u5efa\u56db\u6b65\u6cd5<\/li>\n
  • \u5b9e\u6218：\u53cc\u6912\u6d3eE2000D GPIO\u9a71\u52a8<\/li>\n
  • \u8c03\u8bd5\u4e0e\u9a8c\u8bc1\u6280\u5de7<\/li>\n
  • \u601d\u7ef4\u5bfc\u56fe\u603b\u7ed3<\/li>\n
    \n

    1\ufe0f\u20e3 \u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u6838\u5fc3\u6982\u5ff5<\/h4>\n

    \u4ec0\u4e48\u662f\u5b57\u7b26\u8bbe\u5907：<\/h5>\n
      \n
    • \u4ee5\u5b57\u8282\u6d41\u5f62\u5f0f\u8bbf\u95ee\u7684\u8bbe\u5907（\u5982\u4e32\u53e3\u3001\u952e\u76d8\u3001LED\u7b49）<\/li>\n
    • \u4e0e\u5757\u8bbe\u5907（\u78c1\u76d8）\u76f8\u5bf9，\u65e0\u56fa\u5b9a\u5927\u5c0f\u548c\u7f13\u5b58\u673a\u5236<\/li>\n
    • \u8bbe\u5907\u6587\u4ef6\u4f4d\u4e8e\/dev\u76ee\u5f55，\u901a\u8fc7\u6587\u4ef6\u64cd\u4f5c\u63a5\u53e3\u63a7\u5236<\/li>\n<\/ul>\n
      \u5173\u952e\u7ed3\u6784\u4f53：<\/h5>\n

      struct<\/span> file_operations<\/span> {<\/span>
      \n ssize_t<\/span> (<\/span>*<\/span>read)<\/span>(<\/span>struct<\/span> file<\/span> *<\/span>,<\/span> char<\/span> __user *<\/span>,<\/span> size_t<\/span>,<\/span> loff_t<\/span> *<\/span>)<\/span>;<\/span>
      \n ssize_t<\/span> (<\/span>*<\/span>write)<\/span>(<\/span>struct<\/span> file<\/span> *<\/span>,<\/span> const<\/span> char<\/span> __user *<\/span>,<\/span> size_t<\/span>,<\/span> loff_t<\/span> *<\/span>)<\/span>;<\/span>
      \n long<\/span> (<\/span>*<\/span>ioctl)<\/span>(<\/span>struct<\/span> file<\/span> *<\/span>,<\/span> unsigned<\/span> int<\/span>,<\/span> unsigned<\/span> long<\/span>)<\/span>;<\/span>
      \n int<\/span> (<\/span>*<\/span>open)<\/span>(<\/span>struct<\/span> inode<\/span> *<\/span>,<\/span> struct<\/span> file<\/span> *<\/span>)<\/span>;<\/span>
      \n int<\/span> (<\/span>*<\/span>release)<\/span>(<\/span>struct<\/span> inode<\/span> *<\/span>,<\/span> struct<\/span> file<\/span> *<\/span>)<\/span>;<\/span>
      \n}<\/span>;<\/span><\/p>\n

      \u8bbe\u5907\u53f7\u7ec4\u6210：<\/h5>\n

      #mermaid-svg-9CBkLykTVU6ftcET {font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-9CBkLykTVU6ftcET .error-icon{fill:#552222;}#mermaid-svg-9CBkLykTVU6ftcET .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-9CBkLykTVU6ftcET .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-9CBkLykTVU6ftcET .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-9CBkLykTVU6ftcET .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-9CBkLykTVU6ftcET .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-9CBkLykTVU6ftcET .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-9CBkLykTVU6ftcET .marker{fill:#333333;stroke:#333333;}#mermaid-svg-9CBkLykTVU6ftcET .marker.cross{stroke:#333333;}#mermaid-svg-9CBkLykTVU6ftcET svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-9CBkLykTVU6ftcET .label{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;color:#333;}#mermaid-svg-9CBkLykTVU6ftcET .cluster-label text{fill:#333;}#mermaid-svg-9CBkLykTVU6ftcET .cluster-label span{color:#333;}#mermaid-svg-9CBkLykTVU6ftcET .label text,#mermaid-svg-9CBkLykTVU6ftcET span{fill:#333;color:#333;}#mermaid-svg-9CBkLykTVU6ftcET .node rect,#mermaid-svg-9CBkLykTVU6ftcET .node circle,#mermaid-svg-9CBkLykTVU6ftcET .node ellipse,#mermaid-svg-9CBkLykTVU6ftcET .node polygon,#mermaid-svg-9CBkLykTVU6ftcET .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-9CBkLykTVU6ftcET .node .label{text-align:center;}#mermaid-svg-9CBkLykTVU6ftcET .node.clickable{cursor:pointer;}#mermaid-svg-9CBkLykTVU6ftcET .arrowheadPath{fill:#333333;}#mermaid-svg-9CBkLykTVU6ftcET .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-9CBkLykTVU6ftcET .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-9CBkLykTVU6ftcET .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-9CBkLykTVU6ftcET .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-9CBkLykTVU6ftcET .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-9CBkLykTVU6ftcET .cluster text{fill:#333;}#mermaid-svg-9CBkLykTVU6ftcET .cluster span{color:#333;}#mermaid-svg-9CBkLykTVU6ftcET div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-9CBkLykTVU6ftcET :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}<\/span><\/span><\/span><\/span>\u8bbe\u5907\u53f7 dev_t\u4e3b\u8bbe\u5907\u53f7 12\u4f4d\u6b21\u8bbe\u5907\u53f7 20\u4f4d\u6807\u8bc6\u8bbe\u5907\u7c7b\u578b\u6807\u8bc6\u5177\u4f53\u8bbe\u5907\u5b9e\u4f8b<\/p>\n

      \n

      2\ufe0f\u20e3 \u8bbe\u5907\u53f7\u7ba1\u7406\u673a\u5236<\/h4>\n

      \u67e5\u770b\u5df2\u5360\u7528\u8bbe\u5907\u53f7：<\/h5>\n

      cat<\/span> \/proc\/devices<\/p>\n

      # \u8f93\u51fa\u793a\u4f8b：<\/span>
      \nCharacter devices:
      \n 1<\/span> mem
      \n 4<\/span> tty<\/span>
      \n 5<\/span> \/dev\/tty
      \n ..<\/span>.
      \n 204<\/span> ttyAMA # \u4e32\u53e3\u8bbe\u5907\u5360\u7528204<\/span><\/p>\n

      \u8bbe\u5907\u53f7\u7533\u8bf7\u4e24\u79cd\u65b9\u5f0f：<\/h5>\n
      \u9759\u6001\u6ce8\u518c（\u5df2\u77e5\u7a7a\u95f2\u53f7\u65f6）<\/h6>\n

      dev_t<\/span> dev =<\/span> MKDEV<\/span>(<\/span>250<\/span>,<\/span> 0<\/span>)<\/span>;<\/span> \/\/ \u4e3b\u8bbe\u5907\u53f7250，\u6b21\u8bbe\u5907\u53f70\u8d77\u59cb<\/span>
      \nint<\/span> ret =<\/span> register_chrdev_region<\/span>(<\/span>dev,<\/span> 3<\/span>,<\/span> "mydev"<\/span>)<\/span>;<\/span> \/\/ \u6ce8\u518c3\u4e2a\u8bbe\u5907<\/span>
      \nif<\/span> (<\/span>ret <<\/span> 0<\/span>)<\/span> {<\/span>
      \n printk<\/span>(<\/span>KERN_ERR "Failed to register device number\\\\n"<\/span>)<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \u52a8\u6001\u6ce8\u518c（\u81ea\u52a8\u5206\u914d）<\/h6>\n

      dev_t<\/span> dev;<\/span>
      \nint<\/span> ret =<\/span> alloc_chrdev_region<\/span>(<\/span>&<\/span>dev,<\/span> 0<\/span>,<\/span> 3<\/span>,<\/span> "mydev"<\/span>)<\/span>;<\/span>
      \nif<\/span> (<\/span>ret ==<\/span> 0<\/span>)<\/span> {<\/span>
      \n printk<\/span>(<\/span>KERN_INFO "Allocated major=%d minor=%d\\\\n"<\/span>,<\/span>
      \n MAJOR<\/span>(<\/span>dev)<\/span>,<\/span> MINOR<\/span>(<\/span>dev)<\/span>)<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \u8bbe\u5907\u53f7\u91ca\u653e：<\/h5>\n

      unregister_chrdev_region<\/span>(<\/span>dev,<\/span> 3<\/span>)<\/span>;<\/span> \/\/ \u91ca\u653e\u6ce8\u518c\u76843\u4e2a\u8bbe\u5907\u53f7<\/span><\/p>\n

      \n

      3\ufe0f\u20e3 \u9a71\u52a8\u6846\u67b6\u642d\u5efa\u56db\u6b65\u6cd5<\/h4>\n

      #mermaid-svg-9XhoBfImvm60WKoN {font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-9XhoBfImvm60WKoN .error-icon{fill:#552222;}#mermaid-svg-9XhoBfImvm60WKoN .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-9XhoBfImvm60WKoN .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-9XhoBfImvm60WKoN .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-9XhoBfImvm60WKoN .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-9XhoBfImvm60WKoN .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-9XhoBfImvm60WKoN .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-9XhoBfImvm60WKoN .marker{fill:#333333;stroke:#333333;}#mermaid-svg-9XhoBfImvm60WKoN .marker.cross{stroke:#333333;}#mermaid-svg-9XhoBfImvm60WKoN svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-9XhoBfImvm60WKoN .label{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;color:#333;}#mermaid-svg-9XhoBfImvm60WKoN .cluster-label text{fill:#333;}#mermaid-svg-9XhoBfImvm60WKoN .cluster-label span{color:#333;}#mermaid-svg-9XhoBfImvm60WKoN .label text,#mermaid-svg-9XhoBfImvm60WKoN span{fill:#333;color:#333;}#mermaid-svg-9XhoBfImvm60WKoN .node rect,#mermaid-svg-9XhoBfImvm60WKoN .node circle,#mermaid-svg-9XhoBfImvm60WKoN .node ellipse,#mermaid-svg-9XhoBfImvm60WKoN .node polygon,#mermaid-svg-9XhoBfImvm60WKoN .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-9XhoBfImvm60WKoN .node .label{text-align:center;}#mermaid-svg-9XhoBfImvm60WKoN .node.clickable{cursor:pointer;}#mermaid-svg-9XhoBfImvm60WKoN .arrowheadPath{fill:#333333;}#mermaid-svg-9XhoBfImvm60WKoN .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-9XhoBfImvm60WKoN .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-9XhoBfImvm60WKoN .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-9XhoBfImvm60WKoN .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-9XhoBfImvm60WKoN .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-9XhoBfImvm60WKoN .cluster text{fill:#333;}#mermaid-svg-9XhoBfImvm60WKoN .cluster span{color:#333;}#mermaid-svg-9XhoBfImvm60WKoN div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-9XhoBfImvm60WKoN :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}<\/span><\/span><\/span>\u5b9a\u4e49file_operations\u521d\u59cb\u5316cdev\u7ed3\u6784\u4f53\u6ce8\u518c\u5b57\u7b26\u8bbe\u5907\u521b\u5efa\u8bbe\u5907\u6587\u4ef6<\/p>\n

      \u6b65\u9aa41：\u5b9e\u73b0\u6587\u4ef6\u64cd\u4f5c\u96c6<\/h5>\n

      static<\/span> struct<\/span> file_operations<\/span> fops =<\/span> {<\/span>
      \n .<\/span>owner =<\/span> THIS_MODULE,<\/span>
      \n .<\/span>open =<\/span> mydev_open,<\/span>
      \n .<\/span>release =<\/span> mydev_release,<\/span>
      \n .<\/span>read =<\/span> mydev_read,<\/span>
      \n .<\/span>write =<\/span> mydev_write,<\/span>
      \n .<\/span>unlocked_ioctl =<\/span> mydev_ioctl,<\/span>
      \n}<\/span>;<\/span><\/p>\n

      int<\/span> mydev_open<\/span>(<\/span>struct<\/span> inode<\/span> *<\/span>inode,<\/span> struct<\/span> file<\/span> *<\/span>filp)<\/span> {<\/span>
      \n printk<\/span>(<\/span>KERN_INFO "Device opened\\\\n"<\/span>)<\/span>;<\/span>
      \n return<\/span> 0<\/span>;<\/span>
      \n}<\/span><\/p>\n

      ssize_t<\/span> mydev_read<\/span>(<\/span>struct<\/span> file<\/span> *<\/span>filp,<\/span> char<\/span> __user *<\/span>buf,<\/span> size_t<\/span> len,<\/span> loff_t<\/span> *<\/span>off)<\/span> {<\/span>
      \n const<\/span> char<\/span> *<\/span>msg =<\/span> "Hello from kernel!\\\\n"<\/span>;<\/span>
      \n size_t<\/span> msg_len =<\/span> strlen<\/span>(<\/span>msg)<\/span>;<\/span>
      \n if<\/span> (<\/span>copy_to_user<\/span>(<\/span>buf,<\/span> msg,<\/span> msg_len)<\/span>)<\/span>
      \n return<\/span> –<\/span>EFAULT;<\/span>
      \n return<\/span> msg_len;<\/span>
      \n}<\/span><\/p>\n

      \u6b65\u9aa42：\u521d\u59cb\u5316cdev\u7ed3\u6784\u4f53<\/h5>\n

      struct<\/span> cdev<\/span> my_cdev;<\/span><\/p>\n

      static<\/span> int<\/span> __init mydev_init<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
      \n \/\/ \u521d\u59cb\u5316cdev<\/span>
      \n cdev_init<\/span>(<\/span>&<\/span>my_cdev,<\/span> &<\/span>fops)<\/span>;<\/span>
      \n my_cdev.<\/span>owner =<\/span> THIS_MODULE;<\/span><\/p>\n

      \/\/ \u6dfb\u52a0\u5230\u7cfb\u7edf<\/span>
      \n int<\/span> ret =<\/span> cdev_add<\/span>(<\/span>&<\/span>my_cdev,<\/span> dev,<\/span> 1<\/span>)<\/span>;<\/span> \/\/ \u6dfb\u52a0\u4e00\u4e2a\u8bbe\u5907<\/span>
      \n if<\/span> (<\/span>ret <<\/span> 0<\/span>)<\/span> {<\/span>
      \n printk<\/span>(<\/span>KERN_ERR "cdev_add failed\\\\n"<\/span>)<\/span>;<\/span>
      \n return<\/span> ret;<\/span>
      \n }<\/span>
      \n return<\/span> 0<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \u6b65\u9aa43：\u521b\u5efa\u8bbe\u5907\u6587\u4ef6（\u81ea\u52a8）<\/h5>\n

      \/\/ \u914d\u5408udev\u89c4\u5219\u81ea\u52a8\u521b\u5efa\/dev\u8282\u70b9<\/span>
      \nstatic<\/span> struct<\/span> class<\/span> *<\/span>mydev_class;<\/span><\/p>\n

      mydev_class =<\/span> class_create<\/span>(<\/span>THIS_MODULE,<\/span> "mydev_class"<\/span>)<\/span>;<\/span>
      \ndevice_create<\/span>(<\/span>mydev_class,<\/span> NULL<\/span>,<\/span> dev,<\/span> NULL<\/span>,<\/span> "mydev%d"<\/span>,<\/span> MINOR<\/span>(<\/span>dev)<\/span>)<\/span>;<\/span><\/p>\n

      \u6b65\u9aa44：\u5b8c\u6574\u6e05\u7406\u6d41\u7a0b<\/h5>\n

      static<\/span> void<\/span> __exit mydev_exit<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
      \n device_destroy<\/span>(<\/span>mydev_class,<\/span> dev)<\/span>;<\/span> \/\/ \u5220\u9664\u8bbe\u5907<\/span>
      \n class_destroy<\/span>(<\/span>mydev_class)<\/span>;<\/span> \/\/ \u5220\u9664\u7c7b<\/span>
      \n cdev_del<\/span>(<\/span>&<\/span>my_cdev)<\/span>;<\/span> \/\/ \u5220\u9664cdev<\/span>
      \n unregister_chrdev_region<\/span>(<\/span>dev,<\/span> 1<\/span>)<\/span>;<\/span> \/\/ \u91ca\u653e\u8bbe\u5907\u53f7<\/span>
      \n}<\/span><\/p>\n

      \n

      4\ufe0f\u20e3 \u5b9e\u6218：\u53cc\u6912\u6d3eE2000D GPIO\u9a71\u52a8<\/h4>\n

      \u529f\u80fd\u9700\u6c42：<\/h5>\n
        \n
      • \u901a\u8fc7\u5b57\u7b26\u8bbe\u5907\u63a7\u523640Pin\u6269\u5c55\u53e3\u7684GPIO<\/li>\n
      • \u652f\u6301\u8bfb\u5199\u64cd\u4f5c：echo 1 > \/dev\/gpio_ctrl\u70b9\u4eaeLED<\/li>\n
      • \u652f\u6301ioctl\u8bbe\u7f6e\u8f93\u5165\/\u8f93\u51fa\u6a21\u5f0f<\/li>\n<\/ul>\n
        \u5173\u952e\u4ee3\u7801\u5b9e\u73b0：<\/h5>\n

        #<\/span>include<\/span> <linux\/gpio.h><\/span><\/span><\/p>\n

        #<\/span>define<\/span> GPIO_PIN<\/span> 18<\/span> <\/span>\/\/ \u7269\u7406\u5f15\u811a18<\/span><\/span>
        \n#<\/span>define<\/span> MYDEV_IOCTL_SET_MODE<\/span> _IOW<\/span>(<\/span><\/span>'G'<\/span>,<\/span> 1<\/span>,<\/span> int<\/span>)<\/span><\/span><\/span><\/p>\n

        static<\/span> int<\/span> gpio_mode =<\/span> GPIOF_OUT_INIT_LOW;<\/span> \/\/ \u9ed8\u8ba4\u8f93\u51fa\u4f4e\u7535\u5e73<\/span><\/p>\n

        static<\/span> long<\/span> mydev_ioctl<\/span>(<\/span>struct<\/span> file<\/span> *<\/span>filp,<\/span> unsigned<\/span> int<\/span> cmd,<\/span> unsigned<\/span> long<\/span> arg)<\/span> {<\/span>
        \n switch<\/span> (<\/span>cmd)<\/span> {<\/span>
        \n case<\/span> MYDEV_IOCTL_SET_MODE:<\/span>
        \n gpio_mode =<\/span> arg;<\/span>
        \n gpio_direction_output<\/span>(<\/span>GPIO_PIN,<\/span> gpio_mode &<\/span> 0x1<\/span>)<\/span>;<\/span>
        \n break<\/span>;<\/span>
        \n default<\/span>:<\/span>
        \n return<\/span> –<\/span>ENOTTY;<\/span>
        \n }<\/span>
        \n return<\/span> 0<\/span>;<\/span>
        \n}<\/span><\/p>\n

        static<\/span> ssize_t<\/span> mydev_write<\/span>(<\/span>struct<\/span> file<\/span> *<\/span>filp,<\/span> const<\/span> char<\/span> __user *<\/span>buf,<\/span> size_t<\/span> len,<\/span> loff_t<\/span> *<\/span>off)<\/span> {<\/span>
        \n char<\/span> val;<\/span>
        \n if<\/span> (<\/span>copy_from_user<\/span>(<\/span>&<\/span>val,<\/span> buf,<\/span> 1<\/span>)<\/span>)<\/span>
        \n return<\/span> –<\/span>EFAULT;<\/span><\/p>\n

        gpio_set_value<\/span>(<\/span>GPIO_PIN,<\/span> val –<\/span> '0'<\/span>)<\/span>;<\/span>
        \n return<\/span> 1<\/span>;<\/span>
        \n}<\/span><\/p>\n

        \u7528\u6237\u7a7a\u95f4\u6d4b\u8bd5：<\/h5>\n

        # \u63a7\u5236GPIO<\/span>
        \nsudo<\/span> insmod gpio_driver.ko
        \necho<\/span> 1<\/span> ><\/span> \/dev\/gpio_ctrl0 # \u8f93\u51fa\u9ad8\u7535\u5e73<\/span><\/p>\n

        # ioctl\u8bbe\u7f6e\u6a21\u5f0f<\/span>
        \n#include <sys\/ioctl.h><\/span>
        \nint fd =<\/span> open(<\/span>"\/dev\/gpio_ctrl0"<\/span>, O_RDWR)<\/span>;<\/span>
        \nioctl(<\/span>fd, MYDEV_IOCTL_SET_MODE, 0<\/span>)<\/span>;<\/span> \/\/ \u8bbe\u7f6e\u4e3a\u8f93\u5165\u6a21\u5f0f<\/p>\n

        \n

        5\ufe0f\u20e3 \u8c03\u8bd5\u4e0e\u9a8c\u8bc1\u6280\u5de7<\/h4>\n

        \u8c03\u8bd5\u65b9\u6cd5：<\/h5>\n

        # \u67e5\u770b\u9a71\u52a8\u65e5\u5fd7<\/span>
        \ndmesg<\/span> |<\/span> tail<\/span><\/p>\n

        # \u68c0\u67e5\u8bbe\u5907\u6587\u4ef6<\/span>
        \nls<\/span> -l \/dev\/gpio* # \u786e\u8ba4\u6743\u9650\u548c\u4e3b\u6b21\u8bbe\u5907\u53f7<\/span><\/p>\n

        # \u6587\u4ef6\u64cd\u4f5c\u6d4b\u8bd5<\/span>
        \nsudo<\/span> cat<\/span> \/dev\/gpio_ctrl0 # \u6d4b\u8bd5read<\/span>
        \necho<\/span> 1<\/span> |<\/span> sudo<\/span> tee<\/span> \/dev\/gpio_ctrl0 # \u6d4b\u8bd5write<\/span><\/p>\n

        \u5e38\u89c1\u95ee\u9898\u6392\u67e5：<\/h5>\n\n\u73b0\u8c61\u89e3\u51b3\u65b9\u6848<\/tr>\n\n\n\n\n\n
        insmod\u5931\u8d25：\u8bbe\u5907\u5fd9<\/td>\n\u68c0\u67e5\u8bbe\u5907\u53f7\u51b2\u7a81cat \/proc\/devices<\/td>\n<\/tr>\n
        \u65e0\/dev\u8282\u70b9<\/td>\n\u786e\u8ba4class_create\u548cdevice_create\u6210\u529f<\/td>\n<\/tr>\n
        \u6743\u9650\u4e0d\u8db3<\/td>\n\u914d\u7f6eudev\u89c4\u5219\u6216chmod 666 \/dev\/xxx<\/td>\n<\/tr>\n
        copy_to_user\u6bb5\u9519\u8bef<\/td>\n\u9a8c\u8bc1\u7528\u6237\u7a7a\u95f4\u7f13\u51b2\u533a\u6709\u6548\u6027<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
        \n

        6\ufe0f\u20e3 \u601d\u7ef4\u5bfc\u56fe\u603b\u7ed3<\/h4>\n

        \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

        💡 \u6700\u4f73\u5b9e\u8df5：<\/p>\n

      • \u9519\u8bef\u5904\u7406：\u6240\u6709\u5185\u6838\u51fd\u6570\u8c03\u7528\u540e\u68c0\u67e5\u8fd4\u56de\u503c<\/li>\n
      • \u5e76\u53d1\u63a7\u5236：\u4f7f\u7528mutex_lock\u4fdd\u62a4\u5171\u4eab\u8d44\u6e90<\/li>\n
      • \u8d44\u6e90\u91ca\u653e：exit\u51fd\u6570\u53cd\u5411\u91ca\u653e\u6240\u6709\u8d44\u6e90<\/li>\n
      • \u7528\u6237\u7f13\u51b2\u533a：\u4e25\u683c\u9a8c\u8bc1__user\u6307\u9488\u6709\u6548\u6027<\/li>\n
        \n

        \u6027\u80fd\u4f18\u5316\u6280\u5de7：<\/p>\n

          \n
        • \u6279\u91cf\u5904\u7406：\u5b9e\u73b0aio_read\/aio_write\u652f\u6301\u5f02\u6b65I\/O<\/li>\n
        • \u96f6\u62f7\u8d1d：\u4f7f\u7528vmalloc\u548cmmap\u51cf\u5c11\u6570\u636e\u590d\u5236<\/li>\n
        • \u4e2d\u65ad\u9a71\u52a8：\u4e3a\u9ad8\u5b9e\u65f6\u6027\u8bbe\u5907\u6ce8\u518c\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f<\/li>\n<\/ul>\n

          \u638c\u63e1\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u5f00\u53d1，\u60a8\u5c06\u80fd：
          \n\u2705 \u4e3a\u4efb\u610f\u786c\u4ef6\u521b\u5efa\u6807\u51c6\u63a5\u53e3 \u2705 \u6df1\u5165\u7406\u89e3Linux\u9a71\u52a8\u6a21\u578b \u2705 \u5b9a\u5236\u53cc\u6912\u6d3e\u4e13\u5c5e\u5916\u8bbe\u9a71\u52a8<\/p>\n

          \n

          \u539f\u521b\u6280\u672f\u7b14\u8bb0，\u8f6c\u8f7d\u9700\u6ce8\u660e\u51fa\u5904\u3002\u66f4\u591a\u7cfb\u7edf\u7f16\u7a0b\u5185\u5bb9\u6301\u7eed\u66f4\u65b0\u4e2d\u2026<\/p>\n","protected":false},"excerpt":{"rendered":"

          \u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1.1k\u6b21\uff0c\u70b9\u8d5e29\u6b21\uff0c\u6536\u85cf22\u6b21\u3002Linux\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u5f00\u53d1\u5b8c\u5168\u6307\u5357<\/p>\n","protected":false},"author":2,"featured_media":58467,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[5974,58,44,1363],"topic":[],"class_list":["post-58468","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-a57","tag-linux","tag-44","tag-1363"],"yoast_head":"\nLinux\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u5f00\u53d1\u5b8c\u5168\u6307\u5357 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/58468.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u5f00\u53d1\u5b8c\u5168\u6307\u5357 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1.1k\u6b21\uff0c\u70b9\u8d5e29\u6b21\uff0c\u6536\u85cf22\u6b21\u3002Linux\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u5f00\u53d1\u5b8c\u5168\u6307\u5357\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/58468.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-16T03:04:59+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250816030457-689ff55987d76.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/58468.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/58468.html\",\"name\":\"Linux\u5b57\u7b26\u8bbe\u5907\u9a71\u52a8\u5f00\u53d1\u5b8c\u5168\u6307\u5357 - 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