8-bit Microcontrollers中的主题 Re: Access variables in a C program from inline asm

Access variables in a C program from inline asm

rasmusnygaard — Thu, 08 Jun 2006 16:32:28 GMT

How do I access variables in a C program from inline asm. Now I access the variable by writing direct to the RAMadress from asm.

What do I write instead of XXX when I want to increment the testvar?

void main()

{

char testvar;

asm

{

inc XXX

}

Best regards

Rasmus L. Nygaard, Denmark

CrasyCat — Thu, 08 Jun 2006 18:12:15 GMT

Hello

I assume you are using CodeWarriot for HC08. AM I right?

You just use the variable name as defined.

void foo(void)
{
   char testvar;

   __asm
   {
      inc testvar
   }
}

CrasyCat

rasmusnygaard — Thu, 08 Jun 2006 18:33:52 GMT

Thanks - it works. I did not even try this straight forward method, because of my experience from other compilers.