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What is impure_data?

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LCE
Principal II

‎2025-03-20 11:32 PM

Heyho, 

just checked the build analyser in STM32CubeIDE for my L031 project and found "impure_data" in the RAM list.

Can anyone please explain what that is? Google didn't really help... 

Just curious, RAM size is not a problem for this project (32kB flash is a problem when debugging with UART...).

Thanks!

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Ozone
Lead III

‎2025-03-21 1:16 AM

Perhaps this might help somewhat : https://stackoverflow.com/questions/17515362/lpcxpresso-with-cortex-m3-what-is-libc-alib-a-impure-o-any-why-is-it-using-1k

As I read it, "impure_data" is a special RAM section created for libc to deal with reentrancy.

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Ozone
Lead III

‎2025-03-21 1:16 AM

Perhaps this might help somewhat : https://stackoverflow.com/questions/17515362/lpcxpresso-with-cortex-m3-what-is-libc-alib-a-impure-o-any-why-is-it-using-1k

As I read it, "impure_data" is a special RAM section created for libc to deal with reentrancy.

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