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According to the TRM, the WDT does not produce a reset until it expires twice. After expiring the WDT will set the INT flag if it is unset, and reset the MCU if INT is already set. Before this patch, watchdog_periodic() only un-sets the INT flag. This means that the behaviour of watchdog_periodic is underministic in that the value of the countdown timer will be different depending on when the function was called. This patch fixes this behaviour by also reloading the timout value.
The Contiki Operating System
Contiki is an open source operating system that runs on tiny low-power microcontrollers and makes it possible to develop applications that make efficient use of the hardware while providing standardized low-power wireless communication for a range of hardware platforms.
Contiki is used in numerous commercial and non-commercial systems, such as city sound monitoring, street lights, networked electrical power meters, industrial monitoring, radiation monitoring, construction site monitoring, alarm systems, remote house monitoring, and so on.
For more information, see the Contiki website: