TMS570LS1224: Stack Configurtation Question

Jens Benner

Part Number: TMS570LS1224
Other Parts Discussed in Thread: HALCOGEN

Hello everyone,

I have a question about the configuration of the stack for a TMS570LS1224 Hercules MCU.

The stack configuration is based on the default settings in HALCOGEN. Furthermore I have the RAM usage as shown in the following picture:

My program runs in system mode and therefore uses the user stack since system and user mode use the same stack (see Application Report SPNA218 - April 2015 - nterrupt and Exception Handling on Hercules ARM® Cortex®-R4/5-Based Microcontrollers)

I don't use malloc etc. so I don't use any heap in principle except maybe through the C library.

So it looks like about 163K of the 192K RAM is unused. Is there a special reason why the user stack does not start at the end of the RAM at 0x80030000, as for example with Cortex-M MCUs?

Kind regards
Jens

over 1 year ago

0 jagadish gundavarapu over 1 year ago

TI__Guru 70551 points

Hi Jens,

The amount of stack utilization will be depending on the customer local arguments declarations and function call depth right. And all the global arguments will be moved to the RAM only.

There is no particular reason to allocate the stack with 0x1500 (5KB), for most of the small applications it would be sufficient. And also, Hercules controllers will not support the nested interrupt calls as well. For medium to larger applications, it is user responsibility to increase the stack as required.

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Thanks & Regards,
Jagadish.

0 Jens Benner over 1 year ago in reply to jagadish gundavarapu

Intellectual 330 points

Hello Jagadish,

thank you very much for your reply. So it should be also possible or allowed to initialize the user stack pinter to 0x80030000 as usual for contex-m controllers for example?

Kind regards,
Jens

+1 jagadish gundavarapu over 1 year ago in reply to Jens Benner

TI__Guru 70551 points

Hello Jens,

Jens Benner said:
thank you very much for your reply. So it should be also possible or allowed to initialize the user stack pinter to 0x80030000 as usual for contex-m controllers for example?

It is not possible to change the base address of stack from HALCoGen and we can change only the length of the stack. Please refer below thread,

(+) TMS570LC4357: Move the stack with HALCOGEN? - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

So, you can allocate as much as stack you want from starting address only.

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Thanks & Regards,
Jagadish.