VxWorks下多串口通信设计  

Design of Multi-SerialPorts Communication Based on VxWorks

作　　者：蒲元远[1] 孙大维[1] 

机构地区：[1]东北电子技术研究所,辽宁锦州121000

出　　处：《光电技术应用》2009年第2期47-50,61,共5页Electro-Optic Technology Application

摘　　要：介绍了在VxWorks实时操作系统下对多串口卡的通信设计.说明了多串口卡的硬件设置,阐述在应用层对SEM/MSP-8串口板进行初始化,设置基地址,连接中断等设计要点.成功实现了多个串口工作模式(RS232/RS422)的数据发送功能,中断接收功能.为了实现一对多通信,RS485传输模式采用了广播.提出了一种对单个字符设备传输协议的数据帧分析方法,改善了通信的可靠性.指出了VxWorks下使用看门狗定时及其原因.How to use Multi-SeriaIPorts to communicate in the VxWorks real-time operating systems is in- troduced. The hardware＇ s setting options are described. The design points such as initialization of SEM/MSP-8 at the application-layer, the setting of the base address and the connecting interrupt are emphasized. Data send- ing function and interrupt receiving function are implemented successfully in the multi-serial ports working modes including RS232/RS422. In order to get one-to-several communication, the broadcast in the RS485 mode is adapted to different address. For the purpose of improving stability of transferring, a method of analyzing sin- gle data frame of transferring protocol in the single character equipment is put forward. At last, it points out how and why to use watchdog at VxWorks for timing.

关 键 词：VXWORKS 多串口 RS232/422/485 中断 看门狗 

分 类 号：TP316.7[自动化与计算机技术—计算机软件与理论]