Forum : ST7/STM8
Original Post
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July 13, 2009 - 11:22pm
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It appears that when I enable Automatic Variables Relocation (AVR) some of my volatile variables are no longer treated as such. Looking at the assembly code between code built with and without AVR, the code without AVR correctly reloads my volatile variables, the code with AVR enabled does not. What is the expected behavior? John |
Hi John,
Automatic variables relocation detects the most used global variables (the ones with the highest number of fixups) and locates them to page0 (addresses [0-0xFF]).
This is technically done through a SPACEDEF compiler directive, which locates the given global variables to page0.
There is no link with the "volatile" qualifier, so your code cannot be different with or without AVR.
Can you send us a project or some excerpts that show the problem (.lst files are the most useful)? We will then be able to explain what you see.
Regards,
Bruno
I will try to throw something together in the near future, I have a huge deadline coming fast. All I can say is that a volatile variable set in a timer interrupt works correctly unless I build with AVR. The code is identical with and without AVR, it doesn't work with AVR enabled.