NDLI: Abstract timers and their implementation onto the ARM Cortex-M family of MCUs

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Abstract timers and their implementation onto the ARM Cortex-M family of MCUs

Content Provider	ACM Digital Library
Author	Pereira, David Pinho, Luís Miguel Fresk, Emil Lindner, Marcus Lindgren, Per Lindner, Andreas
Abstract	Real-Time For the Masses (RTFM) is a set of languages and tools being developed to facilitate embedded software development and provide highly efficient implementations geared to static verification. The RTFM-kernel is an architecture designed to provide highly efficient and predicable Stack Resource Policy based scheduling, targeting bare metal (single-core) platforms. We contribute by introducing a platform independent timer abstraction that relies on existing RTFM-kernel primitives. We develop two alternative implementations for the ARM Cortex-M family of MCUs: a generic implementation, using the ARM defined SysTick/DWT hardware; and a target specific implementation, using the match compare/free running timers. While sacrificing generality, the latter is more flexible and may reduce overall overhead. Invariants for correctness are presented, and methods to static and run-time verification are discussed. Overhead is bound and characterized. In both cases the critical section from release time to dispatch is less than 2us on a 100MHz MCU. Queue and timer mechanisms are directly implemented in the RTFM-core language (-core in the following) and can be included in system-wide scheduling analysis.
Starting Page	48
Ending Page	53
Page Count	6
File Format	PDF
ISSN	15513688
DOI	10.1145/2907972.2907979
Journal	ACM SIGBED Review (SIGBED)
Volume Number	13
Issue Number	1
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2004-10-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Computer Science 1700/1701 Engineering 2200/2201

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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