https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/技术 × 产品 × 机器人Hugo 0.160.1 & FixIt v0.4.6-20260517062719-ed8ec5c2zh-CNruohuyang@163.com (Cygnus Yang)ruohuyang@163.com (Cygnus Yang)Sat, 23 May 2026 00:00:00 +0800https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/02-can-frame-format/Sat, 23 May 2026 00:00:00 +0800ruohuyang@163.com (Cygnus Yang)https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/02-can-frame-format/<h2 class="heading-element" id="1-can-帧类型总览"><span>1. CAN 帧类型总览</span> <a href="#1-can-%e5%b8%a7%e7%b1%bb%e5%9e%8b%e6%80%bb%e8%a7%88" class="heading-mark"> <svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg> </a> </h2><p>CAN 协议定义了 4 种帧类型：</p>https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/01-can-physical-layer/Sat, 23 May 2026 00:00:00 +0800ruohuyang@163.com (Cygnus Yang)https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/01-can-physical-layer/<h2 class="heading-element" id="1-什么是-can-总线"><span>1. 什么是 CAN 总线</span> <a href="#1-%e4%bb%80%e4%b9%88%e6%98%af-can-%e6%80%bb%e7%ba%bf" class="heading-mark"> <svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg> </a> </h2><p><strong>CAN</strong>（Controller Area Network，控制器局域网）是由 <strong>Bosch</strong> 公司于 1986 年开发的一种串行通信协议，最初用于汽车内部电子控制单元（ECU）之间的通信。如今已广泛应用于工业自动化、医疗设备、船舶电子等领域。</p>https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/06-canopen-overview/Sat, 23 May 2026 00:00:00 +0800ruohuyang@163.com (Cygnus Yang)https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/06-canopen-overview/<h2 class="heading-element" id="1-canopen-是什么"><span>1. CANOpen 是什么</span> <a href="#1-canopen-%e6%98%af%e4%bb%80%e4%b9%88" class="heading-mark"> <svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg> </a> </h2><p><strong>CANOpen</strong> 是基于 CAN 总线的高层应用层协议，由 <strong>CiA</strong>（CAN in Automation）国际用户组织定义（标准文档 <strong>CiA 301</strong>）。它定义了一套完整的通信规则，使得不同厂商的设备可以在同一 CAN 网络上互操作。</p>https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/03-socketcan-intro/Sat, 23 May 2026 00:00:00 +0800ruohuyang@163.com (Cygnus Yang)https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/03-socketcan-intro/<h2 class="heading-element" id="1-什么是-socketcan"><span>1. 什么是 SocketCAN</span> <a href="#1-%e4%bb%80%e4%b9%88%e6%98%af-socketcan" class="heading-mark"> <svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg> </a> </h2><p><strong>SocketCAN</strong> 是 Linux 内核提供的 CAN 网络子系统，由 Volkswagen 贡献。它将 CAN 总线抽象为<strong>标准网络设备</strong>（如同 eth0），开发者可以使用熟悉的 <strong>socket API</strong> 进行 CAN 通信编程。</p>https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/04-vcan-setup/Sat, 23 May 2026 00:00:00 +0800ruohuyang@163.com (Cygnus Yang)https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/04-vcan-setup/<h2 class="heading-element" id="1-为什么用-vcan"><span>1. 为什么用 vcan？</span> <a href="#1-%e4%b8%ba%e4%bb%80%e4%b9%88%e7%94%a8-vcan" class="heading-mark"> <svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg> </a> </h2><p>在开始 CAN 开发之前，我们需要一个 CAN 测试环境。<strong>vcan</strong>（Virtual CAN）是 Linux 内核提供的虚拟 CAN 网络设备，它：</p>https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/05-send-receive/Sat, 23 May 2026 00:00:00 +0800ruohuyang@163.com (Cygnus Yang)https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/05-send-receive/<h2 class="heading-element" id="1-发送-can-帧的完整流程"><span>1. 发送 CAN 帧的完整流程</span> <a href="#1-%e5%8f%91%e9%80%81-can-%e5%b8%a7%e7%9a%84%e5%ae%8c%e6%95%b4%e6%b5%81%e7%a8%8b" class="heading-mark"> <svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg> </a> </h2><p>发送一个 CAN 帧需要 5 个步骤：</p>https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/07-practice-project/Sat, 23 May 2026 00:00:00 +0800ruohuyang@163.com (Cygnus Yang)https://cygnusyang.github.io/posts/02-%E5%B7%A5%E7%A8%8B%E9%82%A3%E4%BA%9B%E4%BA%8B/03-canopen/docs/module-01-can-bus-basics/07-practice-project/<h2 class="heading-element" id="练习-1虚拟-can-环境搭建"><span>练习 1：虚拟 CAN 环境搭建</span> <a href="#%e7%bb%83%e4%b9%a0-1%e8%99%9a%e6%8b%9f-can-%e7%8e%af%e5%a2%83%e6%90%ad%e5%bb%ba" class="heading-mark"> <svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg> </a> </h2><p><strong>目标</strong>：独立创建和验证 vcan 设备。</p>