CCS/TMS320F28335: *program will not fit into available memory

Joshua Lowry48

Part Number: TMS320F28335
Other Parts Discussed in Thread: C2000WARE

Tool/software: Code Composer Studio

Hello there

I am attempting to program this DSP to generate PWM signals for a 6-switch 3-phase voltage source inverter - this bit is not so important as I have figured out how to do it. What I want to be able to do is send and read information through the USB connection using printf and other functions from the stdio.h library etc. But when I include stdio.h and then call printf in int main, it gives me the following error:

"C:/ti/C2000Ware_1_00_00_00_Software/device_support/f2833x/common/cmd/28335_RAM_lnk.cmd", line 162: error:
program will not fit into available memory. run placement with
alignment/blocking fails for section ".stack" size 0x400 page 1."

I am using a modified version of the "Example_2833xEPwmDeadBand" project example from C2000Ware. I have tried playing with optimisation levels and changing stack size but nothing seems to work. I saw a thread about a similar problem for a different DSP which suggested changing the linker cmd file to one that, as I understood it, loads the program into flash memory instead of RAM but I couldn't find an equivalent file for my DSP.

Thanks for taking the time to read.

over 8 years ago

0 Joshua Lowry48 over 8 years ago

Prodigy 90 points

Bump.

0 Ozino Odharo over 8 years ago

TI__Mastermind 21305 points

Hi Joshua,

If you are looking to use the flash linker command file. It is available in the same direcotry as the ram linker command file. The file name is F28335.cmd. Did you try extending the memory allocation for the .stack? If not try, substituting the .stack line with this line of code:

.stack : >> RAMM1 | RAML4, PAGE = 1

If there's still not enough space, try extend into RAML5. Give this a try and see if this will resolve the error you are seeing.

Regards,

Ozino

0 Joshua Lowry48 over 8 years ago in reply to Ozino Odharo

Prodigy 90 points

Hello Ozino

Thank you very much for you reply. I very much appreciate it.

I tried changing the linker file to the flash linker one and, in short, it works. But there are a few things t I am concerned about. Leaving the .stack line just as: ".stack : > RAMM1 PAGE = 1" results in the same error. Changing it to what you recommended allowed the program to build and upload to the DSP successfully. However, I get the following warning (among others) that I am not sure about:

" split placement (>>) ignored for ".stack": split run placement for this
section is not permitted
.stack : >> RAMM1 | RAML4, PAGE = 1"

This confuses me because the very thing that is "not permitted" apparently solves the error that prevents it from building in the first place. So I am struggling to understand how it is now able to compile successfully. Could you shed some light on why it would do this?

Thanks again for your help so far.

0 Ozino Odharo over 8 years ago in reply to Joshua Lowry48

TI__Mastermind 21305 points

Hi Joshua,

Glad that you got it working for now. So certain sections must remain contiguous in memory and cannot be split. This means it can only have one continuous block in memory. One of such sections is the .stack section. In order to overcome this, you will need to create a combined ramm section that the .stack can use or have it allocate memory to either region and not split across memory regions.

So I would try switching the split (>>) to a single (>) and see if the warning is removed.

If this doesn'twork, then you would want to combine the contiguous RAMM sections into a larger memory and then placing your .stack there.

This wiki page explains more about allocating memory: http://processors.wiki.ti.com/index.php/Linker_Command_File_Primer#Allocate_to_Multiple_Memory_Ranges

This wiki shows the different options avaliable to allocate more memory available for a section:

http://processors.wiki.ti.com/index.php/C28x_Compiler_-_Understanding_Linking#Q:_The_linker_says_.22placement_fails_for_object_.27.text.27_.22._How_can_I_make_more_memory_available_for_.text.3F

Hope this helps.

Regards,

Ozino

0 Joshua Lowry48 over 8 years ago in reply to Ozino Odharo

Prodigy 90 points

Hello Ozino

Thanks for replying again. This answers my question and removes the warning and the links are very informative.

0 Ozino Odharo over 8 years ago in reply to Joshua Lowry48

TI__Mastermind 21305 points

Hi Joshua,

Glad that you were able to resolve your issue.

Regards,

Ozino

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CCS/TMS320F28335: *program will not fit into available memory