device_driver_service_interface

1.From bottom to top, the system is plotted out bus driver layer, device function driver layer, communication layer and user-interface. Each layer provides service to the layer above by interface style.
由下往上将整个驱动软件系统分为总线驱动层、设备功能驱动层、通信层和用户界面等层次，每一层都以接口的形式为上层提供服务。
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