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Ah I didn't know that was the case :D I thought H was just a way to differentiate unexposed pins (vs D which are exposed).
They do work though, and I guess it's somewhat an advantage that a user doesn't get to accidentally configure a pin that they're not supposed to change (like those for QSPI for example). Or would there be any issues with using non-existent ports?
parasquid
Those H pins are quite unusual for nrf52, but if they work for you ...
nrf52 uses just Dnum as all pins except analog are universal, there are no letter named ports like on stm32.