Real-time Embedded Operating System Research Articles

Exploring the Impact of Soft Errors on the Reliability of Real-Time Embedded Operating Systems

The continuous scaling of electronic components has led to the development of high-performance microprocessors that are suitable even for safety-critical applications where radiation-induced errors such as Single Event Effects (SEEs) can have a significant impact on the performance and reliability of the system. This work is dedicated to investigating the reliability of systems based on programmable hardware and Real-time operating Systems (RTOS) in the presence of architectural faults induced by soft errors in the configuration memory of the programmable hardware. We performed a proton radiation test campaigned at PSI radiation facility to identify the fault model affecting the configuration memory of Xilinx Zynq-7020 reconfigurable AP-Soc Device. The identified fault model in terms of SEU and MBU clusters has been used to evaluate the impact of proton-induced faults on applications running within FreeRTOS on a Microblaze soft processor. A Single Event Multiple Upset fault model resulting from a proton test is presented, focusing on characteristics such as shape, size, and frequency of observed cluster of errors. We conduct two fault injection campaigns and analyze the results to assess the effect of cluster size on system reliability. Moreover, we discuss software exceptions caused by faults that can affect the hardware structure of the soft processor.

Research on the Loading Pattern of Embedded System

With the development of information technology, ERTOS(Embedded Real-Time Operating System) not only has involved in the scientific research and engineering domains, but also has many affinities people's life. Loading pattern performance is the most important performance of Embedded Operating System. It needs dispatching all available resources to achieve real-time task. In order to correctly evaluate the performance of a real-time Embedded Operating System, we must be scientific, systematic approach to ERTOS study of the comprehensive performance and accurate testing. This article discusses three loading patterns and the layout of the memory map on the Flash, RAM and external storage media, with tested on hardware platform it description the advantages and disadvantages of this three loading pattern.

Study on Treatment of Wastewater System Based on ARM

In this paper, ARM processor and real-time embedded operating system will be used in controlling system of sewage disposal, compared with the traditional controlling system of sewage disposal online PLC, not only improved the timeliness, reliability and scalability, but also enhanced the system speed. While, in order to control the low-cost, the Fuzzy-PID compound control algorithm used to control the amount of purifying agent, the algorithm can be adapt to the nonlinear and time-varying and improve accuracy. In this paper, the application of Matlab software to carry on the simulation experiment, proved the feasibility and effectiveness of the algorithm at last.

Optimization Design of a Real-time Embedded Operating System Based on ISO17356

This paper distinguishes the differences between dynamic and static operating system from the design target, and discusses the resulting different technologies used when system is implemented. Based on this theory, according to ISO17356 OS specification and using the hardware abstraction layer idea, a simple and efficient static real-time operating system is implemented for ARM architecture, and the kernel contains no more than 3000 lines C codes. With the idea of separating mechanisms and strategies, the internal resources are used as a mechanism to implement different scheduling policies; proposes a priority-based packet scheduling algorithm, which achieves a good performance both in time and space. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3405

Data Acquisition System Based on uC/OS-III Embedded System

This paper presents a data collection system based on C8051F040 processor and real-time embedded operating system uC/OS-III. The hardware part design, uC/OS-III transplant process and notes, system processes are discussed in detail. This system takes the modular design ideas and reasonable task-assigned strategy, make software is easy to code and modify, realizes real-time, high speed data acquisition.

Research and Implementation of Embedded Voice Interaction System Based on ARM in Intelligent Space

This paper presents the design and implementation of voice interaction system based on ARM in service robots intelligent space. ARM Cortex-M3 core based STM32F103 is used for main controller. And real-time embedded operating system μC/OS-II is used to schedule different tasks and manage peripheral devices. LD3320 and XFS4041CN are used for speech recognition and speech synthesis, respectively. Establish a dialogue set by defining the set of two-dimensional array, and then intelligent space updates the dialogue set dynamically via ZigBee wireless network for multiple scenes. If the recognition result is got by speech recognition module, dialogue management module will send corresponding texts to speech synthesis module, enabling text-to-speech output. At the same time, intelligent space decision support system will send corresponding commands to equipments by ZigBee. From lots of experiments and practical applications, we can conclude that voice interaction systems designed in the paper can gracefully satisfy the current request of voice interaction in service robots intelligent space, having great application value.

A Novel DVS Algorithm for Real Time Embedded Operating Systems

Energy efficiency is an important property of mobile and pervasive computing devices. Dynamic voltage scaling (DVS) is an energy saving technique, which is achieved by reducing energy dissipation of the core by lowering the supply voltage and operating frequency. In this paper a novel DVS algorithm is presented, which achieves better energy savings with deadline guarantees using real-time scheduling and task splitting technique. The proposed DVS algorithm is compared with existing RT-DVS algorithms for real-time periodic task sets, analyzing their energy efficiency, and discussing the performance differences quantitatively. The simulation results show that the proposed algorithm closely approaches the theoretical lower bound on energy consumption and reduces the energy consumption by 10–15% over the existing DVS algorithm.

Development of Hybrid Powertrain Control Software

Taking a hybrid electric vehicle (HEV) as the research object, the three component modules of the control strategy, including driver intent interpretation, energy management and coordinated control of the powertrain system are studied in order to improve the reliability of hybrid electric vehicle control program. Considering the characteristic of the hybrid electric vehicle, and to meet diverse functional and performance requirements, a creative real-time and efficient software architecture composed of four functional layers, two data units, and one framework is worked out on the basis of the real-time embedded operating system (RTOS) μC/OS-II and the event-driven application framework for executing hierarchical state machines. Thus the different functions of the software are separated, and the coupling between modules is reduced, so as to facilitate concurrent and collaborative development, and to enhance the maintainability and portability of the software. The issue on how to implement the control strategy developed under the simulation model Matlab/Simulink/Stateflow into the electric control unit as convenient as possible under hand-coding mode is solved. The software is applied on the HEV undergoing lots of experiences on the road, and some typical experiences including process of power shift and regenerative braking are analyzed. Through systematical vehicle test and reliability verification, it is proved that the designed software can control the hybrid powertrain properly and steadily.

Base principles of embedded systems design

Abstract This article describes base approach to hardware and software design of embedded systems. The base principles of embedded and real-time embedded operating systems are discussed. Solutions base on Windows CE, Windows XP embedded and RTLinux are in detail described.