Added EIC External Interrupt Handling#1
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Added EIC External Interrupt (EXTINT) handling for D12/PA_19. The SAMD21 datasheet actually included some info on using the EIC/EXTINT for waking up from sleep (paragraph 21.6.8, page 310).
Disabled PRIMASK instructions. The NVIC IRQs are not assigned by pins, but rather by peripherals (EIC, SysTick, USB, etc). If it still doesn't wake up, you can try using
NVIC_SetPriority(EIC_IRQn, 0)I didn't test this, since I'm not totally sure how you've set it up. If you powering from a computer with a data capable cable, I would expect that the USB will be unhappy after waking up (since CP may not wake up in a manner that re-establishes the CDC/MSC). File system may also be affected?
Let me know how it turns out. If you have any questions at all, don't hesitate to ask us. I am by no means an expert in this (still learning myself), and I have no shame in "elevating" any questions. 😄