基于嵌入式系统的工业控制卡设计

在基于PC104嵌入式开发平台的接收机研制过程中，信道选择、自动增益控制、压控振荡器控制等任务的完成需要一个通用的控制模块来统一处理，鉴于此应用需求，本文基于研华PCM-3370平台，提出一种基于PC104总线、8255、CPLD的多功能工业控制卡设计，完成了具体的设计及调试工作，对控制卡的原理和实现进行了较详细介绍。主要包括系统硬件结构、CPLD逻辑设计、WDM功能驱动程序以及测试程序等相关要点的阐述。实际测试证明，该控制卡具有可靠性高、体积小、抗震性好的优点，适合于嵌入式系统中的扩展IO控制及需要低速模拟量AD与DA输出的应用，完全满足应用需求。

Design of industrial control card based on embedded system

In the project of designing receiver based on PC104 module, the implement of signal channel select, automatic gain control, and voltage controlled oscillator tune need a general controlling module to accomplish. Thus based on the Advantech PCM-3370 Embedded computing module, the design of a multi-function industrial control card based on PC104 bus, 8255 and CPLD is presented. Complete the practical design and testing task. Put forward a detailed introduction of the principle and implementation. Including the system hardware architecture, CPLD logic design, WDM function driver and testing MFC bench.The actual testing result attests that such a control card can meet the application of extended IO and conversion between analog and digital signals. In addition, it has high solidity and excellent aseismatic performance.