摘要
I/O板卡是PC-BASED类型工控应用中重要的外围设备。传统的I/O板卡功能单一,其用户态下的操作受到操作系统影响而具有不确定性。另外,其编程方法中对ISR的应用有一些局限,而其中断延迟在一些超高速的工控场合仍然无法满足要求。针对传统I/O板卡的局限性,提出"主动式"I/O模块的概念,描述其系统结构,讲解提高系统实时性能的机制。
I/O board is an important peripheral of PC- BASED control system, conventional I/O board has some shortage in real - time industry control system: the operation time to it may be affected by the OS, the usage of ISR to it has some limits, the ISR delay can't meet some hard real- time cases. The paper introduce the active I/O module ,describe the construction of it and explain how it enhance the real - time performance of control system.
出处
《计算技术与自动化》
2009年第1期71-74,共4页
Computing Technology and Automation
基金
广东省自然科学基金项目(020848)
关键词
I/O板
中断服务程序
共享内存
I/O board
interrupt service routine
memory sharing