基于PXI Express总线的多通道数字化仪软件技术研究

Research on Multi-channel Digitizer Based on PXI Express Bus

摘要:

针对各种数字化设备高采样率和高分辨率的测试需求,设计一种基于PXI Express总线的多通道数字化仪。该数字化仪开放性高,灵活性好,模块化强,广泛应用于测控领域中。结合数字化仪开发过程中所面临的关键问题及解决方案,重点从设备驱动程序、接口封装和应用软件三个方面进行分析阐述。首先,深入研究了KMDF设备驱动开发过程中几个关键问题,如配置空间访问、中断处理、DMA数据传输等的运行机制及实现方法；然后,以数字化仪应用需求为背景,阐述了采用.Net平台下三层体系架构的软件总体设计；最后,大量实验测试和结果分析表明,该数字化仪具有较强的可靠性和稳定性,达到预期技术要求和性能指标。

Abstract:

A multi-channel digitizer based on PXI Express bus is designed for high sampling rate and high resolution test requirements of various digital devices. The digitizer, widely used in the field of measurement and control, has high openness, flexibility and modularization. Combined with the digitizer development process faced by the key issues and solutions, the device driver, interface encapsulation and application software of digitizer are researched in this paper. Firstly, several key issues of KMDF device driver development are discussed, such as configuration space access, interrupts handling and DMA data transmission. Secondly, after analyzing the application requirements of digitizer, this paper introduces the three-tier architecture of software design scheme based on .Net platform. At last, the experiment results show that this system has good reliability, stability and achieves the expected technical requirement and performance index.