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staggeringly productive evening. Finally implemented a proper UART for watch, so we can talk to it via serial. Figured I was already in SERCOMland, so I also implemented our SPI controller. Then (with an assist from #circuitpython!) I got SPI Flash working:https://github.com/joeycastillo/Sensor-Watch/commit/523a5d2f0b3f0d79b16784470870935313dd5775

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