吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (5): 1398-1403.doi: 10.7964/jdxbgxb201405028

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Worst case of CAN massage response time in FPNS

CHEN Yun-han1,QIN Gui-he1,2,CHEN Si-guo1,CANG Chen-yang1,GAO Yang3   

  1. 1.College of Computer Science and Technology, Jilin University, Changchun 130012,China;
    2.State Key Laboratory of Automobile Simulation and Control, Jilin University, Changchun 130022, China;
    3.Information Communication Company, Jilin Electric Power Company Limited, Changchun 130021, China
  • Received:2013-05-07 Online:2014-09-01 Published:2014-09-01

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Abstract: In the Fixed Priority Non-preemptive Scheduling (FPNS) research for Controller Area Network (CAN) message set, the existing Worst Case Response Time (WCRT) analysis may draw wrong conclusions to the schedulability of certain message sets. To overcome this problem, based on the message busy period concept of PFNS for CAN message set, this paper reanalyzes the scenarios that message enters the transmit queue of node for the first time and the subsequent times, and revises the worst case response time. The WCRT calculated from this worst case is employed to revise the optimistic result obtained by tradition WCRT analysis, and eliminate the pessimistic factor introduced in the modified WCRT analysis.

Key words: computer application, controller area network, fixed priority non-preemptive scheduling, response time, worst case

CLC Number: 

  • TP336
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