CCS/TMS570LC4357: Stack Usage

Soundes Marzougui

Intellectual 310 points

Part Number: TMS570LC4357

Tool/software: Code Composer Studio

Hello,

I want to run an encryption algorithm that needs 10kilo bytes of memory.

For that I did changes in .cmd file

MEMORY
{
/* USER CODE BEGIN (2) */
/* USER CODE END */
    VECTORS (X)  : origin=0x00000000 length=0x00000020
    FLASH0  (RX) : origin=0x00000020 length=0x001FFFE0
    FLASH1  (RX) : origin=0x00200000 length=0x00200000
    STACKS  (RW) : origin=0x08000000 length=0x00030000 //<= here are my canges I took from the RAM memory
    RAM     (RW) : origin=0x08030000 length=0x0007EB00 //<= here are my canges I took from the RAM memory

/* USER CODE BEGIN (3) */
/* USER CODE END */
}

and I changed the stack in CSS by going to Project-> Properties-> ARM linker -> basic options and I put stack size 167kB which means 0x00030000.

The problem I get is that during the execution the program is pointing to a non-valid memory address. (during allocation of some char * arrays of size 1000).

I checked again the stack usage.

Here is my question: If I did give the stack 167 kB, why in the stack usage it is taking just 10400 Bytes ?

How can I convince this fabulous stack that he can use 167 kB from the RAM!!

(kB = kilo bytes)

Best regards,

Sounde Marzougui.

over 7 years ago

0 George Mock over 7 years ago

TI__Guru**** 251620 points

Memory allocated dynamically at run time, by calling malloc (or related functions), does not come from the stack, but the heap. Please search the ARM compiler manual for the sub-chapter titled Dynamic Memory Allocation.

Further, always check the result returned by malloc for NULL, which means the allocation failed. It is typical to write a custom function similar to this ...

void *malloc_with_check(size_t size)
{
   void *ptr = malloc(size);

   if (ptr == NULL)
   {
       /* error recovery */
   }

   return ptr;
}

Thanks and regards,

-George

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CCS/TMS570LC4357: Stack Usage