说明： 建立了设备驱动与嵌入式系统的一种关系模型，分析和抽象出了一种基于该模型的设备驱动架构设计方案，并
给出了一例实现。重点叙述了各模块的功能和该驱动架构的关键技术 (a device driver and embedded systems as a model, analysis and an abstract based on the model of device driver architecture design program, and gives the case to achieve. Focuses on the functions of each module and the driver of the key technology framework)
