RTOS/TM4C1294KCPDT: Memory_alloc() (xdc.runtime.Memory) vs malloc() (stdlib.h)

Abhijit Acharekar

Part Number: TM4C1294KCPDT

Tool/software: TI-RTOS

Dear Member,

New to TI and TI-RTOS. Planning to use TI-RTOS on TM4C1294KCPDT. We will be creating OS Abstraction layer. W.r.t. memory related to functionality, what's difference between Memory_alloc() (xdc.runtime.Memory) and malloc() (stdlib.h)? which one is preferred?

Thank you for your help.

over 6 years ago

0 Charles Tsai over 6 years ago

TI__Guru**** 191346 points

Hi,
Please refer to the section 7.7.2-7.7.5 about the SYS/BIOS Memory_alloc() and the RTS malloc.
www.ti.com/.../spruex3u.pdf

0 Abhijit Acharekar over 6 years ago in reply to Charles Tsai

Intellectual 640 points

Hi Charles.

Thank you for your response.

If I understood correctly, using Memory_alloc() with NULL parameter or simply using malloc() is the same.
I would like to know more about RTS library; can you please share some link?

Thanks & Regards

Abhijit

0 Charles Tsai over 6 years ago in reply to Abhijit Acharekar

TI__Guru**** 191346 points

Hi,
TI compiler provides the standard C Runtime support library. You should be able to find the source, library and documents under something like <CCS_installation>/tools/compiler/ti-cgt-arm_18.1.3.LTS/

0 Abhijit Acharekar over 6 years ago in reply to Charles Tsai

Intellectual 640 points

Hi Charles,

Thanks for your reply.

BTW, is my understanding(in previous email) regarding "Dynamic Memory location" correct?.

Thanks & Regards

Abhijit

0 Charles Tsai over 6 years ago in reply to Abhijit Acharekar

TI__Guru**** 191346 points

Hi,
Basically, If the application configuration does not set Memory.defaultHeapInstance, then SYS/BIOS will create a HeapMem heap of this size. This heap will be assigned to Memory.defaultHeapInstance and will therefore be used as the default system heap. This heap will also be used by the SYS/BIOS version of the standard C library functions malloc(), calloc() and free()."

0 Abhijit Acharekar over 6 years ago in reply to Charles Tsai

Intellectual 640 points

HI Charles,
Thank you for your response. It seems I need to further read and understand the memory stuff.
Closing this thread for now.
Once again than you for your support.
Regards
Abhijit

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RTOS/TM4C1294KCPDT: Memory_alloc() (xdc.runtime.Memory) vs malloc() (stdlib.h)