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Dang very cool. If there's ever a Photon 2 I'll definitely look at the low-power ARM world.

(FWIW Photon's USB stack is handled by a STM32F730 and I've been perfectly happy with it. Expensive though.)

IMO that's an odd choice for a micro. It initially looked like it could translate the custom SD card writing to FAT in SW, but with only 64K of flash that's not great. Some STM HAL irqs are almost that size. My recommendation is to find 1 micro that can do low power and USB, and maybe put external FRAM/QSPI for more code storage is needed.

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