FreeRTOS Support Archive
The FreeRTOS support forum is used to obtain active support directly from Real
Time Engineers Ltd. In return for using our top quality software and services for
free, we request you play fair and do your bit to help others too! Sign up
to receive notifications of new support topics then help where you can.
This is a read only archive of threads posted to the FreeRTOS support forum.
The archive is updated every week, so will not always contain the very latest posts.
Use these archive pages to search previous posts. Use the Live FreeRTOS Forum
link to reply to a post, or start a new support thread.
[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [November 2012 Threads] system heap dynamic sizePosted by vincent on November 16, 2012 all:
as we know that the configTOTAL_HEAP_SIZE value is used by FreeRTOS to manage all running task. i want to know the system heap dynamtic size which is defined in startup_stm32f2xx.s Heap_Size EQU 0x00004000
AREA HEAP, NOINIT, READWRITE, ALIGN=3 __heap_base Heap_Mem SPACE Heap_Size __heap_limit
i really want to get the dynamic value used in MALLOC and FREE. anyone knows that ?
vincent
RE: system heap dynamic sizePosted by Dave on November 16, 2012 I don't think I understand your question. The heap that is defined in the code you post will only be used if either your project uses heap_3.c (heap_1, heap_2 and heap_4 do not use it), or your code uses malloc() and free() directly rather than pvPortMalloc() and vPortFree().
If you don't use malloc() and free(), and use don't use heap_3.c, and you are not using library functions that use malloc(), then you can set to size to 0 if the linker will let you, or 4 if the linker won't let you as the RAM is just being wasted.
RE: system heap dynamic sizePosted by vincent on November 18, 2012 I wonder to know that the memory is allocated from the HEAP my code define when i use MALLOC / FREEfunction. as my application use JSON library which use more MALLOC and FREE, i found that the system become halt sometime. i try to find if the HEAP to be used is not enough large or other issue.
vincent
Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.
|