c-file befor startup code

For instance, a ram test coded in C could be called before the startup code initializes the static C variables

I want to fill the area between the stack and the heap to get to know if both areas are big enough for my project.

That means I have to run this c-file after the startup code and befor the main function. How can I do that? Where is the right place and the right call for the function?

JChris

For instance, a ram test coded in C could be called before the startup code initializes the static C variables

I want to fill the area between the stack and the heap to get to know if both areas are big enough for my project.

That means I have to run this c-file after the startup code and befor the main function. How can I do that? Where is the right place and the right call for the function?

JChris

"I want to fill the area between the stack and the heap to get to know if both areas are big enough for my project."

So why do you specifically need a 'C' file to do that?

Isn't that precisely the sort of thing that is far more appropriate in assembler?

Why not just include this in the startup?

Where would be the right place to do that in the startup? Just befor entering the main routine?

Could you describe the code I have to adjust to the startup - because I'm not really familiar with assembler.

Thanks in advance
JChris

That means I have to run this c-file after the startup code and befor the main function. How can I do that? Where is the right place and the right call for the function?

What is the difference between

StartCode();
main();
and
void main (void)
{
  StartCode();
....

Erik