How can I find out the amount of heap sapace and stack is used to optimize allocation of heap sapace and stack?

Ashok,

What device are you using?

John

John,

the processor I am using is LM3S9B96.  One more question, Do you know, is there a document that provides the library of C function calls supported by CCS for Stellaris LM3S9B96 family? If there is one how can I download it. Thanks.

Ashok Modi

Ashok,

One thought on the stack is to reduce it and then watch for stack overflow.  The following wiki topic shows how you can use watchpoints to check for stack overflow. I am going to see if someone can quickly add the info for Cortex M3.

http://processors.wiki.ti.com/index.php/Checking_for_Stack_Overflow_using_Unified_Breakpoint_Manager

John

John,

thank you. I will go to the link suggested for my answers.

Ashok Modi

Ashok,

The heap is entirely dependent on the amount and type of data used for dynamic allocation (malloc, calloc, printf, etc.), therefore there is no mechanism in place to precisely evaluate the heap usage (unless if using an RTOS like BIOS).

To help evaluate the amount of heap used, check these tips:

- The usage for malloc/calloc allocation is pretty straightforward (number of elements X size)

- I usually start with 0x400 as a heap size (purely empiric value) when I only have printf() calls in my code. If you intend to use the C++ counterpart (cin/cout), the heap allocation should be larger (starting at 0x1000).

Additional details about the console I/O functions (printf, scanf, etc.) can be found in the page below:

http://processors.wiki.ti.com/index.php/Tips_for_using_printf

Hope this helps,

Rafael