boards/ek-lm4f120x: Change internal LED macro for C2Rust compatibility#20831
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mguetschow merged 2 commits intoRIOT-OS:masterfrom Aug 26, 2024
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C preprocessor defines in non-function form are assumed by C2Rust to be constant if they are an expression and not a statement; the LED_PORT was the only place in the code where that was wrong, and led to compiler errors due to the value not being constant. Altering the internal macro to use function form sidesteps that issue. The generally preferred alternative of using a `const` is unavailable in this case because the dereferencing operator is already part of the vendor header file cpu/stellaris_common/include/vendor/cortex-m4-def.h. The changed macro is documented as required by doccheck. The doccheck rule that grandfathered in the LED_PORT macro as allowed undocumented is not removed because it is also used in other board.h files.
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chrysn
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Aug 23, 2024
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| #define LED_PORT (GPIO_PORTF_DATA_R) | ||
| /** | ||
| * @brief Port used for `LED0_ON` and similar implementations |
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This is LED0_ON and not @ref LED0_ON because Doxygen could not resolve that.
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mguetschow
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Aug 26, 2024
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Contribution description
With that applied, a bunch of BOARD_BLACKLIST entries can be removed (from all Rust Makefiles we have).
Testing procedure
I did not test LED blinking on that board as I don't have one, but the change should be sufficiently easy to verify on a theoretical level (supported by the compiler passing).