[SOLVED] Exclude variable from initialization

jev · Dec 18th 2019, 8:14pm

I have a couple of variables in my program that need to survive a reset. Thus, I did:

C Source Code

volatile uint32_t _px __attribute((section (".non_init")));

In flash_placement.xml, I added the section:

XML Source Code

<ProgramSection alignment="4" load="No" name=".non_init" />

I am using the GNU linker.

However, the variable seems to be zeroed at startup. I can find the .non_init section in the map file and it contains my variable.

How can I solve this?

SEGGER - Nino · Dec 19th 2019, 3:48pm

Hello,

Thank you from your inquiry.
The use of the section here appears to be correct. So it should be working.
You should have the file thumb_crt0.s in your project. Here you can verify which sections are zeroed at startup and which are not.
Is non_init zeroed here as well?

Best regards,
Nino

C Source Code

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