When some microprocessors working with USB equipments in embedded systems without their own USB controller, their USB interface must be expanded.

对于多款微处理器本身没有USB的控制器，为了在嵌入式系统中使用USB设备，需要自行扩展usb接口。

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The status and function of the LCD controller in the embedded system, and the liquid crystal displayer's interface signal's definition and function are introduced.

介绍了液晶显示控制器在嵌入式系统设计中的地位和作用，液晶屏接口信号的定义及作用。

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Then mainly expatiates RTL8019AS Ethernet controller driver and serial interface driver of embedded communication platform; Finally, discusses the application program development and driver testing.

然后重点阐述了嵌入式通信平台RTL8019AS以太网控制器和串口驱动程序的设计方法，并分析了驱动程序的调试方法；

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