Malfunction monitoring method and system
First Claim
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1. A method of monitoring a watchdog signal output from a processing unit during execution of a program and of determining that the processing unit is presumed to be malfunctioning, upon lack of change in the monitored watchdog signal within a predetermined timeout period, the method comprising:
- generating an interrupt to the processing unit every predetermined period, the predetermined period being shorter than the predetermined timeout period, the watchdog signal being changed in response to each of the generated interrupts; and
disabling the interrupt generation, upon the last interrupt being generated over an estimated time when the execution of the program is estimated to be completed.
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Abstract
In a method, an interrupt is generated to the processing unit every predetermined period. The predetermined period is shorter than a predetermined timeout period. A watchdog signal is changed in response to each of the generated interrupts. The interrupt generation is disabled, upon the last interrupt being generated over an estimated time when the execution of the program is estimated to be completed.
15 Citations
20 Claims
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1. A method of monitoring a watchdog signal output from a processing unit during execution of a program and of determining that the processing unit is presumed to be malfunctioning, upon lack of change in the monitored watchdog signal within a predetermined timeout period, the method comprising:
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generating an interrupt to the processing unit every predetermined period, the predetermined period being shorter than the predetermined timeout period, the watchdog signal being changed in response to each of the generated interrupts; and disabling the interrupt generation, upon the last interrupt being generated over an estimated time when the execution of the program is estimated to be completed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for monitoring a watchdog signal output from a processing unit during execution of a program and for determining that the processing unit is presumed to be malfunctioning, upon lack of change in the monitored watchdog signal within a predetermined timeout period, the system comprising:
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a generating unit configured to generate an interrupt to the processing unit every predetermined period, the predetermined period being shorter than the predetermined timeout period, the watchdog signal being changed in response to each of the generated interrupts; and a disabling unit configured to disable the interrupt generation of the generating unit, upon the last interrupt being generated over an estimated time when the execution of the program is estimated to be completed. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification