ThinkMind // DEPEND 2011, The Fourth International Conference on Dependability // View article depend_2011_1_50_40061
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A Dependable Microcontroller-based Embedded System
Keywords: dependable system; control flow checking method; concurrent error detection; microcontroller-based system; embedded system.
This paper presents a method to make a dependable microcontroller-based system for detecting any violation from the program flow caused by transient faults. The method is based on a duplication and comparison technique and employs a “synchronous interrupt” in both microcontrollers to monitor and compare the program counters (PCs) of the microcontrollers. This is done by adding an interrupt service routine in both microcontrollers and without any modification of the application programs. The method has been experimentally evaluated using AVR ATMega-32 microcontrollers. The results show that error detection coverage of the method is 100% based on the fault models. The error detection latency varies about 1184 cycles (74 sec) to 128147 cycles (8 msec) and the execution time overhead of the method varies between 0.5% and 50% for different PC exchange interrupt frequencies. The hardware and software overheads are about 100% and less than 0.5% respectively.
Pages: 24 to 29
Copyright: Copyright (c) IARIA, 2011
Publication date: August 21, 2011
Published in: conference
Location: Nice/Saint Laurent du Var, France
Dates: from August 21, 2011 to August 27, 2011