说明：  清华大学ARM培训教材，通过这本教材，学习嵌入式系统的硬件软件协同设计方法，面向多目标，多任务的微内核嵌入式操作系统等方法与技能。
(Tsinghua University, ARM training materials, through this teaching and learning of embedded systems hardware and software co-design method for multi-objective, multi-mission micro-kernel embedded operating system and other methods and skills.)