[{"data":1,"prerenderedAt":229},["ShallowReactive",2],{"article-first-time-debug-serial-port":3},{"title":4,"article":5,"hot_article":15,"month_arch":78,"cover":226},"初识串口 - 独孤影的博客",{"id":6,"title":7,"uri":8,"author":9,"tags":10,"created_at":12,"view_count":13,"content":14},109,"初识串口","first-time-debug-serial-port","duguying",[11],"串口","2023-11-28 08:49:22",155,"\u003Cp>一直很想了解设备驱动编程。所以就从最基础，最简单的设备开始了解。串口，应该是所有设备中最简单最常见的设备。在linux中，有一种最简单的串口设备在\u003Ccode class=\"inline-code\">\u002Fdev\u003C\u002Fcode>下表现的是字符设备（c），字符设备可以被打开并且读写。\u003C\u002Fp>\n\n\u003Cp>我认识的第一个最简单的串口设备是一个usb接口的gps模块，如下图\n\u003Cimg src=\"https:\u002F\u002Fimage.duguying.net\u002F2023\u002F11\u002Ffmvi8se8.webp\" alt=\"fmvi8se8\" \u002F>\n它是我目前为止，用过的最简单的串口设备，它只需要读，无需写，单向通讯，我只需要打开字符设备，然后不停的从中读取数据就可以了，里面的数据是GPS定位信息相关的字符串，根据它的文档，进行字段解析，就能获取到经纬度、时间、角度、速度等信息。我曾经用golang写过一个一个程序获取这些信息\n\u003Cimg src=\"https:\u002F\u002Fimage.duguying.net\u002F2023\u002F11\u002Fsbtao9zf.png\" alt=\"sbtao9zf\" \u002F>\n这个程序，实际上可以算是一个用户态的设备驱动程序。\u003C\u002Fp>\n\n\u003Cp>我认识的第二个串口设备是一套蓝牙模块，用了usb转串口线连接蓝牙模块\n\u003Cimg src=\"https:\u002F\u002Fimage.duguying.net\u002F2023\u002F11\u002Fddlsq0na.webp\" alt=\"ddlsq0na\" \u002F>\n按照设备的文档，我将它通过usb转串口线连接，然后将usb插上电脑，成功识别到串口。然后手机通过客服提供的调试app连接蓝牙信号，电脑上用串口读写软件将串口打开，手机上发送信息，电脑串口上能收到信息，电脑串口上还能发送特定的AT指令对设备进行查询与设置。\n\u003Cimg src=\"https:\u002F\u002Fimage.duguying.net\u002F2023\u002F11\u002F3wwg8uas.webp\" alt=\"3wwg8uas\" \u002F>\n值得注意的是，我在连接模块的过程中，将usb转串口上的tx连接了模块tx，rx连接了模块的rx，导致无法收发消息，客服帮我找出问题并告诉我应该将tx连接rx，rx连接tx。想到这一点我恍然大悟，这跟rust里的\u003Ccode class=\"inline-code\">channel\u003C\u002Fcode>，go里的\u003Ccode class=\"inline-code\">chan\u003C\u002Fcode>，以及linux上的通用管道一样，都属于管道模型，对端的输出接入到设备的输入，对端才能将信息传给设备。后续我想我会进一步对这个蓝牙模块编写用户态驱动程序，进而尝试编写内核态驱动程序。\u003C\u002Fp>\n\n\u003Cp>其实早在我认识GPS串口设备之前，我也试过温湿度传感器DHT22，但是，这玩意儿根本不是串口，它只有一个数据接口(DATA)，也就是不像串口那样分rx,tx，它需要通过gpio口连接DATA针，然后通过高电位低电位来实现双向通讯，从而获取到温湿度数据。它既然不是串口设备那么也不能作为通用设备直插一般的电脑了。\u003C\u002Fp>\n\n\u003Cp>在我看来，程序能驱动物理设备，也是一件很有趣的事情。\u003C\u002Fp>\n",{"title":16,"list":17},"最热文章",[18,24,30,36,42,48,54,60,66,72],{"id":19,"title":20,"uri":21,"author":9,"created_at":22,"view_count":23},28,"docker容器目录与主机目录同步","\u002Farticle\u002Fdocker容器目录与主机目录同步","2014-12-31 12:34:08",15573,{"id":25,"title":26,"uri":27,"author":9,"created_at":28,"view_count":29},21,"beego中使用fis","\u002Farticle\u002Fbeego中使用fis","2014-12-03 10:47:56",9253,{"id":31,"title":32,"uri":33,"author":9,"created_at":34,"view_count":35},20,"用github登录，oauth开发","\u002Farticle\u002F用github登录，oauth开发","2014-11-23 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