嵌入式系统Linux下LCD显示驱动的开发

嵌入式系统通常使用LCD作为显示设备,嵌入式Linux下,如果图形界面接口采用的是MicroWindows,MiniGUI或Qt-Embedded,则LCD设备的驱动程序必须采用Linux的帧缓冲设备来处理与LCD控制器有关的底层命令。帧缓冲是Linux为图形设备提供的一个抽象接口,它允许上层应用程序在图形模式下直接对显示缓冲区进行读写操作。文中介绍了Linux帧缓冲设备驱动程序框架,详细分析了帧缓冲设备驱动程序层次结构、核心功能模块和数据结构,最后基于三星公司S3C2410x处理器的开发平台,系统地给出了Linux下帧缓冲驱动程序开发和调试实例。

Development of LCD Device Driver in Linux Embedded System

An LCD is a standard display device for hand-held embedded systems.If GUIs(graphic user interface) such as MiniGUI,MicroWindows of Qt-Embedded in the embedded Linux are used,LCD device drivers must be implemented as Linux frame buffer device drivers in addition to those low level operations which only deal with commands provided by LCD controllers.The frame buffer device provides an abstraction for the graphics hardware.It represents the frame buffer of some video hardware,and allows application software to access the graphics hardware through a well-defined interface.This paper introduces the framework of the Linux frame buffer device driver,and gives a detailed analysis of the architecture,key functions and data structures of the Linux frame buffer device driver.By taking the platform of Samsung's S3C2410x processor for example,the paper systematically describes how to develop and debug a Linux frame buffer device driver.