本文介紹了在嵌入式實(shí)時(shí)操作系統(tǒng)Vxworks下串行設(shè)備的驅(qū)動(dòng)架構(gòu)及實(shí)現(xiàn)，提出了
一種基于RS-485總線的新型串口通信協(xié)議，重點(diǎn)討論了基于這種協(xié)議的應(yīng)用程序的設(shè)計(jì)方法，發(fā)送時(shí)主要采用了總線仲裁機(jī)制，接收時(shí)主要采用了字符合法性校驗(yàn)、長度校驗(yàn)、內(nèi)容的CRC校驗(yàn)，提高了系統(tǒng)的通信效率和穩(wěn)定性。
關(guān)鍵詞：VxWorks；RS-485；通信協(xié)議；總線仲裁；CRC 校驗(yàn)
Abstract: This paper introduces the structure of the driver for serial device in VxWorks. A
new serial communication protocol based on RS-485 data bus is brought up, and then the
paper expounds how to design the application by this protocol. The application mainly uses
the bus arbitration mechanism in transmission. In reception, it will do validity check of the
characters, length check, CRC check. Thus, the system will work more stably and efficiently.
Key words: VxWorks; RS-485; Communication Protocols; Bus Arbitration; CRC