problem with GPIOA_Type DATA field in TM4C

[pabigot]

Thanks for making these available; I've been unable to get SVD or CMSIS information from TI directly. Can you say where you obtained them?

Reason I ask is the GPIOA_Type declarations have:

__I  uint32_t  RESERVED0[255];
__IO uint32_t  DATA;
__IO uint32_t  DIR;

I feel reasonably certain this is wrong, and that the correct declaration is:

__IO uint32_t  DATA[256];
__IO uint32_t  DIR;

which permits bit-banded access to pins 0 and 2 through (for example) GPIOA->DATA[0x05].

I'd like to see the SVD to try to confirm my understanding of how the map is supposed to be used.

[pabigot]

The content can be fixed with:

cd Devices/TI
find . -name '*.h' | xargs sed -r -i -f/tmp/s.sed

with /tmp/s.sed being:

/GPIOA(_AHB)? Structure/,/^}/{
/RESERVED0/d
s/  DATA;     /  DATA[256];/
}

[pabigot]

On further reflection, the original is not "wrong", it's just unfortunately incomplete. The original declared DATA register is the right one to manipulate all pins at once; the declaration simply fails to provide a way to use the underlying hardware's ability to affect a subset of the pins. Too bad.