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Replying to @josecastillo

The J variant of the SAM L22 has three external wake pins:
* RTC/IN[0] on PB00
* RTC/IN[1] on PB02
* RTC/IN[2] on PB01 or PA02

PB00 and PB02 are on the 9-pin connector; they’re part of SERCOM3, which is how the it can talk to an SPI device. I mapped PA02 to one of the buttons.

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