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{"@context":"https://schema.org","@type":"QAPage","mainEntity":{"@type":"Question","name":"How does the watchdog work?","text":"\u003cp dir=\"auto\"\u003eHi!\u003cbr\u003e\nI am a bit confused by how the watchdog works in Arduino FreeRTOS.\u003cbr\u003e\nAs I have to run my Unity tests in a task to use delay and stuff like that, it seems that I am triggering the watchdog.\u003cbr\u003e\nIf I try to set the watchdog, changing portUSE_WDTO instead seems to cause other things to change that also may cause the watchdog to trigger.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTBH, it is very difficult to troubleshoot this, at least to me, so if anyone have an idea what to do, I'd be very happy. :-)\u003c/p\u003e","upvoteCount":1,"answerCount":2,"acceptedAnswer":{"@type":"Answer","text":"\u003cp dir=\"auto\"\u003eI'm not 100% sure how to answer your question, or perhaps to address your underlying concern.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe AVR ATmega Watchdog Timer (WDT) is a simple counter that can be configured on roll-over to a) reset the MCU, b) trigger an interrupt, c) trigger and interrupt and if the interrupt is unserviced reset the MCU on the next counter roll-over. The counter is incremented by an integrated oscillator, independent of any other oscillators in the MCU, which runs at nominally 128kHz.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn Arduino FreeRTOS the WDT is configured to firstly interrupt at roll-over and then at the second roll-over then reset the MCU. If you keep the global interrupt disabled for extended times then you will find that your MCU is resetting, but really 15ms + 15ms at 16MHz is a very long time.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThere are \u003ca href=\"https://github.com/feilipu/Arduino_FreeRTOS_Library/issues/113\" data-hovercard-type=\"issue\" data-hovercard-url=\"/feilipu/Arduino_FreeRTOS_Library/issues/113/hovercard\"\u003eissue\u003c/a\u003e and \u003ca href=\"https://github.com/feilipu/Arduino_FreeRTOS_Library/issues/114\" data-hovercard-type=\"issue\" data-hovercard-url=\"/feilipu/Arduino_FreeRTOS_Library/issues/114/hovercard\"\u003eissue \u003c/a\u003ehere on the Arduino delay function, and the FreeRTOS delay function.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePerhaps they will cast some light on the question for you too?\u003c/p\u003e","upvoteCount":2,"url":"https://github.com/feilipu/Arduino_FreeRTOS_Library/discussions/117#discussioncomment-5247500"}}}