System architecture directions for networked sensors
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Contiki - A Lightweight and Flexible Operating System for Tiny Networked Sensors
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Science of Computer Programming - Special issue on new software composition concepts
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This work-in-progress paper introduces a new hardware platform for wireless sensor networks, summarizes the new challenges it creates for software development and describes a toolchain being developed to meet those challenges. The hardware platform is based on a low-power FPGA as opposed to a traditional microcontroller. The FPGA configuration includes a soft core microcontroller, but there are plenty of resources left to implement a subset of the operating system, middleware and application components directly on the FPGA. Instead of creating this partition early in the design phase, we advocate a flexible hardware/software boundary enabling "late binding" of components to the soft core or the hardware fabric. This increases the complexity of the design space mandating sophisticated tool support. The paper describes a toolchain that helps manage this complexity. The two main tools are a domain-specific modeling environment and a symbolic design-space exploration tool.