针对嵌入式系统开发平台构建中的硬件环境差异问题，给出了一种高移植性的硬件抽象层设计方案，并介绍了实现方法。
As a software layer between embedded operation system and hardware in embedded system, HAL (hardware Abstraction layer) is a key problem of embedded application.
嵌入式软件开发平台作为一类重要、复杂的系统软件，其技术含量高、价格昂贵，是现代嵌入式系统开发的必备工具环境。
As a kind of important and complicated system software, embedded software development environment is a high-tech, expensive and necessary tool of the modern embedded system.
根据多媒体应用平台的特点和嵌入式系统开发需求．制定一种符合要求的GUI系统。
On the basis of multimedia application platform and the embedded system development's requirements, establishes a GUI system which according to this requirements.
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