嵌入式復合型工業(yè)總線網(wǎng)關(guān)的CAN口設計

本文提出了一種基于VxWorks 嵌入式操作系統(tǒng)的工業(yè)總線協(xié)議轉(zhuǎn)換器—TC700。它能夠?qū)崿F(xiàn)RS232/RS485/CAN 與以太網(wǎng)的協(xié)議轉(zhuǎn)換，是一種復合型的多協(xié)議轉(zhuǎn)換網(wǎng)關(guān)。在
對TC700 功能原理簡單說明的基礎上，筆者著重從TC700 的硬件電路結(jié)構(gòu)設計和軟件驅(qū)動程序開發(fā)兩個方面，具體分析介紹了該網(wǎng)關(guān)CAN 接口驅(qū)動設計的過程。通過移植UNIX 系統(tǒng)下u-boot 中的spi.c 程序，完成了CAN 接口驅(qū)動程序的設計內(nèi)容。
關(guān)鍵詞：VxWorks； 協(xié)議轉(zhuǎn)換器； 網(wǎng)關(guān)； CAN； SPI
Abstract：This paper presents a design of protocol convertor—TC700 for industry fieldbus on embedded operating system of VxWorks. The protocol conversion for RS232/RS485/CAN to EthernetTC700 can be realized, and it can be looked as a multiplex protocol convertor. The
author emphasizes on two sides based on the simplified explain of TC700' theory, the hardware design and the software drive program development, and gives a detailed driver design progress of the device-driver of CAN bus. The design of device-driver of CAN bus is implemented by transplanting the spi.c program in u-boot of UNIX.
Keywords: VxWorks; Protocol Convertor; Gateway; CAN; SPI