可视化CAN总线通信机制的实现

摘要

CAN总线是1种广泛应用于工业控制领域的国际标准化现场总线[1].CAN控制器(MCP2510)内置的协议引擎用于实现CAN协议所采用的物理层和数据链路层,但是内部数据的不可视性使得在实验教学中,不便于对CAN通信的实质性理解.显示模块(LCD1602)和按键的引入可实现CAN节点内部数据的可视化并且可随意设置CAN报文的标准标识符域和报文滤波,有助于对CAN通信机制和协议优点的理解.%CAN-bus is an international standard fieldbus widely-used in industrial control field. CAN controller' s (MCP2510) built-in protocol engine is used to implement the physical layer and data link layer employed by CAN protocol, but the invisibility of internal data makes it hard to have a substantial understanding of CAN communication process in experimental teaching. The introduction of display module (LCD 1602) and keys can implement the visibility of internal data and set the standard identifier field and message filter at random, which is helpful to understand CAN communication mechanism and the advantage of protocol.