Linux下PCI字符设备驱动程序数据传输机制的研究

设备驱动程序是应用程序和真实设备之间的软件层.它负责控制和与硬件通信.数据的传输和处理对设备驱动程序来说是至关重要的部分,驱动程序必须保证数据不丢失.因而对驱动程序的设计者来说,数据传输机制的设计比较困难,特别是在实时应用中.作者抽象了整个PCI字符设备驱动数据传输的过程,通过仔细的设计中断处理程序和缓冲区策略,实现了多通道语音采集压缩卡的驱动,并在实验和用户现场良好运行.

Research on the data transfers mechanism of PCI character device drivers in Linux

Device driver is a software layer that lies between applications and the actual device. It plays the role of controlling and communicating with the device. Data transferring and handling are critical parts for the device driver which needs to guarantee the data integrality with no data losing. Thus it is difficult for the de-vice driver designers to design the data transfers mechanism, especially in the real-time application. In this pa-per, the authors abstract the whole data transfers of PCI character device driver and implement the driver of multi-channel voice codee card by carefully designing the interrupt handler and buffering strategy, and it works well in the experiments and user scenes.