Compiler/TMS320F28379D: Ram area for stack

Ralf Koester

Expert 1400 points

Part Number: TMS320F28379D

Tool/software: TI C/C++ Compiler

Hallo,

for using the sprintf function I had to increase the stack from 400h to 800h (recommendation from E2E).

From an original TI cmd-file the stack was located in RAMM1Page1, which is to small for 800h.

I changed the stack location to the RAMLS5 area located at adress 0x00A800h, which works satisfactory.

But when I changed to RAMGS area, the program chrashed. Is this normal?

Is there a recommandation to put the stack in the RANLS area or RAMM area?

Where to find?

Ralf

over 7 years ago

0 Disona over 7 years ago

Genius 3050 points

Hi, Ralf
Check this thread, please: e2e.ti.com/.../664189
You can put SP to GS0...GS3, but not to GS4 and higher, because SP can access addresses in range 0x0000 ... 0xFFFF

0 Vivek Singh over 7 years ago in reply to Disona

TI__Guru** 115971 points

You can find this info here (in section 2.2.5 Stack Pointer (SP)).

Vivek Singh

0 Ralf Koester over 7 years ago in reply to Disona

Expert 1400 points

This touches the Piccolo F28069, and the document SPRS698 has no chapter 3.5.8 or 3.5.9.
Where else can I search in the F28379D datasheet.
br Ralf

0 Ralf Koester over 7 years ago in reply to Ralf Koester

Expert 1400 points

Thanks, found in chapter 2.2.5!
br ralf

0 lslonim over 7 years ago

Expert 1710 points

Just a note about stacks on these processors. We have gotten burned several times by over running stack. Now we do this process when we think the code is done: use the Fill Memory feature of the debugger to fill the whole stack area with a pattern like 0x5555, run the program and exercise all the features, then break into the debugger and look at the stack area. You can see how far the stack goes, and we were surprised to see that on some products the whole area was used. If so, we then expanded the stack and tested again. Hope this helps.

Lloyd

0 Hareesh Janakiraman over 7 years ago in reply to lslonim

TI__Guru* 95315 points

Please check the app.note at www.ti.com/.../spra820.pdf

0 lslonim over 7 years ago in reply to Hareesh Janakiraman

Expert 1710 points

Thanks Hareesh, that looks like a great idea to use!
Lloyd

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Compiler/TMS320F28379D: Ram area for stack