<div>
to do this you need to use assembler....<br />
<br />
for C/C++ the inline asm is like this..<br />
<br />
{<br />
&nbsp; //Code<br />
&nbsp; asm {<br />
&nbsp; //asm code goes here,,<br />
&nbsp; }<br />
}<br />
<br />
SP(Stack Pointer) is the assembler register....<br />

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to do this you need to use assembler....

for C/C++ the inline asm is like this..

{
  //Code
  asm {
  //asm code goes here,,
  }
}

SP(Stack Pointer) is the assembler register....


<div>
Thanks bculver, I need few clarifications on your code.<br />
<br />
The 1024 you put in the char stack array, Is is a assumed figure ? or is that a fixed figure??<br />
<br />
Why do you put 1024-2 to get ptr to the top of the stack?, is it not 1024-1?<br />
<br />
What is the reason behind moving values to AX before moving them to SP and SS respectively?<br />
<br />
Would appreciate your clarifications very much.<br />

</div>


Thanks bculver, I need few clarifications on your code.

The 1024 you put in the char stack array, Is is a assumed figure ? or is that a fixed figure??

Why do you put 1024-2 to get ptr to the top of the stack?, is it not 1024-1?

What is the reason behind moving values to AX before moving them to SP and SS respectively?

Would appreciate your clarifications very much.


<div>
<div class="content wysiwyg-content">
Inside a Interrupt Service Routine, I need to change the presently running program's Stack to the ISR's Stack. I have two questions.<br />
<br />
1. What is the Code for this in Microsoft C? or can I use &nbsp; &nbsp; inline assembly?<br />
2. How do I determine where to put the Stack Pointer? i.e &nbsp; &nbsp; how do I determine the amount of stack used?
</div>
</div>


Inside a Interrupt Service Routine, I need to change the presently running program's Stack to the ISR's Stack. I have two questions.

1. What is the Code for this in Microsoft C? or can I use     inline assembly?
2. How do I determine where to put the Stack Pointer? i.e     how do I determine the amount of stack used?

Switching Stacks

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.