Smallest BSS possible for XMC1100

[User8683]

Hello,

My application needs just over 14KB of SRAM, but what I have found is that an empty DAVE project requires 2068 bytes of BSS so I have just under 14KB. Is there any way to release any of that memory by removing certain include libraries or taking other steps?

Any suggestions are appreciated as I am finding that my questions are rarely answered in these forums.

Thanks,

Jason

[Travis]

What apps are you running in your projects?

[User8683]

Hello,

It is not about the apps in my case. I need a lot of RAM for analyzing the ADC signal that I will be measuring. The 2068 bytes that I refer to is the bss size that results when I create a program without any apps in it at all. If a new DAVE project with a Main.c file is created in the IDE, this is the bss size that will result.

Jason

[jferreira]

Hi,

You can reduce the memory allocated for the stack in the linker script.
In your project open the file .ld and search for the line containing:

stack_size = 2048;

Change the stack size according to the needs of your application.

Best regards,
Jesus

[User8683]

Thanks for that info. As a suggestion, it would make sense to write a tool to determine this size from the code rather than set an arbitrary value. This is a common task.

[User8734]

Good day longtimer,

Sorry for asking - if you use -O2 (-Os) option as reccomended?

I am as well curious about what application you try to built.

As far I myself plan to use FFT functions. If you aware about CMSIS library integrated in DAVE already?
Some nice examples exist there, which can be imported into DAVE:
../CMSIS/DSP_Lib/Examples_M4/

BR
K

[User8683]

Hi XmCfAn2014,

I have played with the optimization settings but the biggest size difference was 4 additional bytes so that wasn't proving useful. That is why I hoped I could get some freed up.

My application is a fuzzy logic application for signal monitoring in fleet management

Thanks for the tip about CMSIS DSP. Some of the functions could be very handy in future. I had thought CMSIS was only RTOS related and was not relevant for me. Some of the statistical functions could be useful.