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This work proposes a deterministic hardware and software reconfiguration scheme capable of mitigating interference on reconfiguration execution time generated by system components performing I/O operations. The scheme decomposes the reconfiguration process into small steps such that it is preemptable, transparent, dynamic and compliant with real-time requirements. Moreover, the impact of the interference...
A Wireless Sensor Network (WSN) is composed by many tiny embedded systems with sensing, processing and communication capabilities. These sensors use limited power sources, such as batteries, making energy a key resource that needs management. One of the main contributors to energy consumption in WSN nodes is data transmission through a radio device, and the parameter that most influences energy consumption...
Several implementations of Real-Time Dynamic Voltage and Frequency Scaling (RT-DVFS) have been made in the last decade. Most of them, however, are adaptations performed over some Linux-based operating system. The real-time support on Linux systems depend on complex modifications of the system kernel and is often not regarded as hard real-time support. This work presents the design and implementation...
Wireless sensor networks and other pervasive systems are getting common place in our everyday life. This technology made it possible the deployment of a new class of applications encompassing a set of new challenges. To cope with these new requirements developments in the last decade enhanced the level of integration of processing (e.g., CPU) and communication (e.g., radio) components. Also, new approaches...
This paper addresses an approach for accurately measuring energy consumption on battery-powered embedded systems which can be adequately tuned in order to enhance a set of timing and energy consumption metrics for mission critical systems. We introduce a software-based accounting scheme which is calibrated by low-precision battery state-of-charge reads through a battery voltage model. We then perform...
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