Background

pwr.h (g0, g4, l4) provide access to the PWR_PUCRx and PWR_PDCRx registers by defining PWR_PORT_[A-G] and applying an offset with PWR_PUCR() and PWR_PDCR() macros.

Issue

I can neither make assignments nor copy-modify-write using this macro. The following both fail, for various combinations of port and right hand side:

PWR_PUCR(PWR_PORT_C) |= 1;
PWR_PUCR(PWR_PORT_C) = 1;

Solution

This appears to be due to nesting the MMIO32 macro. It seems the right pattern would be to remove the MMIO32 macro from the PWR_PORT_[A-G] definitions, aping the the GPIO pattern where the GPIO_PORT_x_BASE are integer constants that are wrapped by MMIO32 in the downstream macros designed to work with these constants.

I've confirmed this solution works, but I'm too underwater to open a PR myself, and haven't investigated potential side effects / dependencies / references. Documenting the issue in case anyone else runs into it, if anything else.