底层SAL屏蔽了操作系统的差异，API层使接口变得稳定并更方便使用，中间层DRV则是驱动的主体。
The lowest layer SAL shielded the differences among operating systems, the API layer made the interfaces stable and easily used, and the middle layer DRV was the main part of the driver.
底层SAL屏蔽了操作系统的差异，API层使接口变得稳定并更方便使用，中间层DRV则是驱动的主体。
The lowest layer SAL shielded the differences among operating systems, the API layer made the interfaces stable and easily used, and the middle layer DRV was the main part of the driver.
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