本文适用于对嵌入式系统没有概念和经验， 渴望进入嵌入式系统开发的领域， 但又觉得系统太复杂，要学的东西太多， 感觉完全无从学起，无从下手 的 初级开发人员-this applies to the concept of embedded systems and no experience, eager to enter the embedded system development areas, but think the system is too complicated,