![]() ![]() If you are using any other Sleep mode, you have to use LOW for the interrupt trigger.Idle Sleep mode is pretty useless on an Arduino, as the millis/ micros counters are updated every millisecond (and a bit) by Timer 0 overflow, and that will wake up from Idle Sleep mode too.You cannot use a FALLING interrupt if you are in any sleep mode, other than Idle Sleep mode.In summary, as I tend to get carried away by the sound of my own typing: So, that particular sleep mode, in an Arduino environment, is pretty useless I’m afraid. If enabled, a level triggered interrupt will generate an interrupt request as long as the pin is held low.Īlso, it’s worth noting that as you are using the Arduino language, if you do use Idle sleep mode, then it will wake up every millisecond or so, as the Timer 0 overflow interrupt is used to update the millis and micros counter. So, for example, if your function toggles an LED when it gets an interrupt, it will fire repeatedly, all the time the pin, it is attached to, is held LOW. It’s not a one-off trigger like the edge triggers, RISING, FALLING, TOGGLE are. The data sheet explains (page 50) in the “Sleep Modes” section, that all other sleep modes require a level interrupt if you are using INT4, INT5, INT6 or INT7, so you cannot use FALLING, you have to use LOW instead.Ī LOW trigger will mean that the interrupt service routine, flussostatoWakeUp, will execute while the button/pin is held LOW. INT4, INT5, INT6 and INT7 can only wake non-Idle sleep modes with a LOW interrupt. Unless you are using Idle Sleep Mode, the lightest of sleep modes, then your interrupt will not wake the Mega2560 unless the interrupt is on pins INT0, INT1, INT2 or INT3 which can wake any sleep mode. ![]() AttachInterrupt(digitalPinToInterrupt(flussostato), flussostatoWakeUp, FALLING) ĮDITED To correct details of wake up calls! See italicised text. ![]()
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