Execute specific functions from RAM

[nagarasr]

Hi, I would like to know the procedure to execute specific functions from RAM.

I have tried __ramfunc at beginning of the function but it requires all the subsequent functions also to be run from RAM. This would require lot of manual code updates. Is there a way to do it from linker script? I tried placing the functions like below but it would not move the function from ROM to RAM.

place in RAM_region { readwrite,
                                    block CSTACK,
                                    block HEAP,
                                    readonly object function1 // this is my expected function to run from RAM
};

[KnarfB]

What compiler /IDE? What MCU exactly?  

 

[nagarasr]

MCU - STM32H573VI

IDE - IAR 9.30.1

 

 

[STTwo-32]

Hello @nagarasr and welcome to the ST Community :smiling_face_with_smiling_eyes:.

I think this article may help you.

Best Regards.

STTwo-32 

[nagarasr]

Hi STTwo-32,

I am using STM32H573VI MCU and IAR 9.30.1 IDE. I went through the article but it did not contain the required information. There exists lot of code currently written by other over so many years and now we are facing timing issues. To increase the execution speed, we are tying to run specific functions only from RAM. How do I select those specific functions via Linker script and do not disturb the code base?

 

[mƎALLEm]

Hello @nagarasr ,

Please refer to this application note section 2: https://www.st.com/resource/en/application_note/an4296-use-stm32f3stm32g4-ccm-sram-with-iar-embedded-workbench-keil-mdkarm-stmicroelectronics-stm32cubeide-and-other-gnubased-toolchains-stmicroelectronics.pdf