The operation system calls these services rather than manipulating hardware directly.
操作系统将调用这些服务，而不是直接地操作硬件。
As a software layer between embedded operation system and hardware in embedded system, HAL (hardware Abstraction layer) is a key problem of embedded application.
在嵌入式系统中，硬件抽象层作为嵌入式操作系统和硬件之间的软件层次是嵌入式应用的一个关键问题。
The hardware and software constructions, the operation of this system and several output voltage waveforms are provided in this paper.
文中介绍了实验系统的硬件和软件结构，系统的运行情况，并给出了几种频率的输出波形照片。
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