sumpfralle opened a new pull request, #16997:
URL: https://github.com/apache/nuttx/pull/16997
## Summary
The functions `hw_write_masked` and `hw_xor_bits` (as defined in pico-sdk)
were defined twice in NuttX.
Additionally these definitions were in conflict (one lacked the `volatile`
modifier).
Now these functions and their dependencies are defined in a new header file.
Its name is based on the filename of the original definition in pico-sdk:
```
src/rp2_common/hardware_base/include/hardware/address_mapped.h
```
## Impact
This change should fix the potential issue of GPIO operations failing due to
compiler optimizations caused by the absence of `volatile`.
## Testing
The changes were compile-tested. Previously compilation failed. Since my
project does not use these specific functions on the rp2040 board, I cannot
prove their correctness.
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