每个LLD都提供了到特定底层硬件的接口，但所使用的到中间层的接口却是一组标准接口。
Each LLD provides the interface to the particular underlying hardware but USES the standard set of interfaces to the mid layer.
蓝牙规范包含了一个符合标准的接口定义(主机控制器接口)，它适用于蓝牙通讯模块的硬件部分。
The Bluetooth specification includes the definition of a standardised interface (the Host Controller interface) to the hardware of a Bluetooth communications module.
接口库主要由两部分组成：特定硬件平台MPC555 的底层功能驱动函数库和针对汽车电子开发领域的特定算法接口库。
The interface library mainly contains two part of compositions, which are drive function of MPC555 hardware platform and particular algorithm interface library aiming at the autocar development realm.
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