MSP430F5342: Detected floating point operation. Recommend moving them to RAM during run time or not using as these are processing/power intensive Warning !!!!!

Soumya Ranjan Rout

Part Number: MSP430F5342

Hi, I am using MSP430 to read temperatures form the sensors . To convert the digital temperature value read from the sensors to analog using a function which does some floating point calculation. The execution control is not going into the floating point calculation function and I am seeing the above warning . I browse through and found some link by following which I tried to put the function into RAM as below, but it is not helping me.

Is there anything I am missing here , suggestions would be helpful.

#pragma CODE_SECTION(tempDigitalToAnalogConversion, ".ramfunc")

float tempDigitalToAnalogConversion(int digitalTemp)

{

;

}

In the lnk_msp430f5342.cmd file as below :

SECTIONS

{

….

.ramfunc : {} load=FLASH, run=RAM // that means load the function from FLASH to RAM and run in RAM,

…..

}

Thanks

over 2 years ago

0 Keith Barkley over 2 years ago

Guru 42145 points

Do you have speed or power bottle necks? If not, don't worry about it. This is just advice.

0 Soumya Ranjan Rout over 2 years ago in reply to Keith Barkley

Prodigy 30 points

No , but the issue is the execution control is not going inside the floating point function.

0 Keith Barkley over 2 years ago in reply to Soumya Ranjan Rout

Guru 42145 points

Unless you just want to learn about putting functions in RAM, just remove the pragmas and command file adjustments and run it from flash.

0 David Schultz over 2 years ago

Guru 24805 points

If floating point gets the job done quickly enough for you, ignore the warning.

Moving those operations to RAM isn't trivial since all of the work is done in library code pulled in by the linker.

0 Soumya Ranjan Rout over 2 years ago in reply to David Schultz

Prodigy 30 points

Hi David, Keith

The reason I am trying to move this floating point operation function to RAM is, this function is not getting called with the normal scenario like all rest of the functions are getting called . I could see a warning message like the screenshot attached below. The requirement is to convert the digital temperature value to analog and for that , this floating point function "tempDigitalToAnalogConversion" has to be executed. Is there any way , without putting this function to RAM I can execute it .

Thanks & regards,

Soumya

+1 Bruce McKenney over 2 years ago in reply to Soumya Ranjan Rout

Guru 100555 points

As Keith mentioned, this is Advice, not a Warning. You can ignore it without guilt. You can disable the check using "Build Settings->Build->Settings->Compiler->ULP Advisor". (I'm pretty sure the ULP Advisor can't tell whether or not your function is in RAM, since the Linker would be the one to put it there.)

The Advice message has no effect on execution. How do you tell that the function isn't being called?

+1 Keith Barkley over 2 years ago in reply to Soumya Ranjan Rout

Guru 42145 points

I think you need to share your code, a pared down version that shows the problem would be helpful - and often in the act of paring it down you find the issue.

+1 Soumya Ranjan Rout over 2 years ago in reply to Keith Barkley

Prodigy 30 points

Hi Keith, Bruce

The issue is resolved . It was due to compiler optimization the function was getting removed.

0 Keith Barkley over 2 years ago in reply to Soumya Ranjan Rout

Guru 42145 points

If you were calling it, it shouldn't have been removed. Hop over to the CCS board and explain it as a compiler bug.

https://e2e.ti.com/support/tools/code-composer-studio-group/ccs/f/code-composer-studio-forum

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MSP430F5342: Detected floating point operation. Recommend moving them to RAM during run time or not using as these are processing/power intensive Warning !!!!!