Hardware Abstraction Architecture

This TEP documents a Hardware Abstraction Architecture (HAA) for TinyOS 2.0 that balances the conflicting requirements of code reusability and portability on the one hand and efficiency and performance optimization on the other. Its three-layer design gradually adapts the capabilities of the underlying hardware platforms to the selected platform-independent hardware interface between the operating system core and the application code. At the same time, it allows the applications to utilize a platform’s full capabilities -exported at the second layer, when the performance requirements outweigh the need for cross-platform compatibility.