这一层提供了一组通用函数供底层网络设备驱动程序使用，让它们可以对高层协议栈进行操作。
This layer provides a common set of functions to be used by lower-level network device drivers to allow them to operate with the higher-level protocol stack.
本论文主要论述了嵌入式汽车网络系统的底层硬件设计和驱动程序的设计，为汽车网络系统的应用打下了良好的基础。
This paper mainly discusses the Hardware and Linux Device Drivers Design of Embedded automobile network system, and it has made a good prepare for the use of the automobile network system.
为了支持这些功能，又介绍了网络模块、485串口通讯模块、定时器模块、闪存模块、中断模块等底层驱动的设计。
To support these tasks, the thesis discusses the design of the GPRS communication module, the RS485 communication module, the IrD communication module, the tinier module and the FLASH module.
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