http://processors.wiki.ti.com/index.php/Stack_and_Heap_size_requirements
The general recommendation to determine amout of stack required is to fill the stack with a known value (can be done in linker command file by filling the .stack section), let the program run and see how much of the stack was altered by viewing it in a memory window. This should tell how much stack was used and accordingly, the stack size can be reduced or increased as needed.
but the page dont have the detail operations,so do you know how to do this.
thanks.