Fixed attachInterrupt() for use during sleep #90
Merged
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The current implementation of attachInterrupt() will not work on Arduino Zero during sleep (standby mode). By default, all the pins wake up capability during sleep is disabled (Section 20.8.9 Wake-Up Enable in SAMD21 datasheet). Code is tested on a Arduino Zero for pins 0 - 24 (except pin 4). Without these changes, the processor will not wake up if it depends solely on the pin state change as the only source of waking up.