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Scott Shan
Scott Shan
Associate
November 21, 2017
Solved

About Min_Heap_Size and Min_Stack_Size

  • November 21, 2017
  • 2 replies
  • 2015 views
Posted on November 21, 2017 at 07:12

Hi,

my STM32F302R8 Device with 64KByte FLASH, 16KByte RAM.

I configured 

Min_Heap_Size and Min_Stack_Size in file '

stm32_flash.ld' as below.

_Min_Heap_Size = 0x400;

_Min_Stack_Size = 0x1000;

While build the project codes, below error was happened.

----------------------------------------

--------------------------------------------------------------------------------

c:/emb_tool/gcc-arm-none-eabi/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/bin/ld.exe: ./Release/my_app.elf section `._user_heap_stack' will not fit in region `RAM'

c:/emb_tool/gcc-arm-none-eabi/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/bin/ld.exe: region `RAM' overflowed by 96 bytes

collect2.exe: error: ld returned 1 exit status

make: *** [all] Error 1

----------------------------------------

----------------------------------------

----------------------------------------

After changed 

_Min_Heap_Size from  0x400 to 0x200, re-bulid it and no more error.

Actually, I didn't know how to figure out the _Min_Heap_Size and _Min_Stack_Size.

Does any expert share the experience how to figure out the 

_Min_Heap_Size and 

_Min_Stack_Size?

Thanks.

    This topic has been closed for replies.
    Best answer by AvaTar
    Posted on November 21, 2017 at 07:42

    Basically, the usage is the same as with compilers in a OS environment.

    Heap is used for allocated memory (malloc, new), and the stack for call parameters and local variables.

    Depending on your project, 1k of heap and 4k of stack seems quite a lot.

    I do rarely use allocated memory, thus heap size is zero for most of my projects.

    Some IDEs start out with a default setting of 128 bytes of stack.

    c:/emb_tool/gcc-arm-none-eabi/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/bin/ld.exe: ./Release/my_app.elf section `._user_heap_stack' will not fit in region `RAM'

    Strange message - actually, heap and stack alone do fit.

    In most cases, the linker puts heap and stack first, and complains about 'user' variables overflowing.

    2 replies

    AvaTar
    AvaTarBest answer
    Senior III
    November 21, 2017
    Posted on November 21, 2017 at 07:42

    Basically, the usage is the same as with compilers in a OS environment.

    Heap is used for allocated memory (malloc, new), and the stack for call parameters and local variables.

    Depending on your project, 1k of heap and 4k of stack seems quite a lot.

    I do rarely use allocated memory, thus heap size is zero for most of my projects.

    Some IDEs start out with a default setting of 128 bytes of stack.

    c:/emb_tool/gcc-arm-none-eabi/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/bin/ld.exe: ./Release/my_app.elf section `._user_heap_stack' will not fit in region `RAM'

    Strange message - actually, heap and stack alone do fit.

    In most cases, the linker puts heap and stack first, and complains about 'user' variables overflowing.

    Scott Shan
    Scott ShanAuthor
    Associate
    November 28, 2017
    Posted on November 28, 2017 at 04:43

    Hi AvaTar,

    Thanks a lot.

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