Assemble language subroutin with parameters?

young · Joined: 24 Jun 2004 Posts: 285

I know it is not right to ask this question here, and I should be able to find it somewhere in the web, however, I just want to communicate with you guys and make me understand it deeply and fast.

My question is how to define a subroutine in assemble language with parameter? such as the following code, How to understand it, what is the parameters, and how do I call it in a program? I did not have background on assemble, any help will be appreicated!

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Look at the sample code in this post. It shows how to pass a
parameter to ASM code.
http://www.ccsinfo.com/forum/viewtopic.php?t=21520

DragonPIC · Joined: 11 Nov 2003 Posts: 118

See pic datasheet. It lists all instructions.

You need to use CALL to call a subroutine.

CALL 039 //should call this routine

although, if you are not on the same page, extra coding is required.
_________________
-Matt

Guest · Posted: Mon Apr 04, 2005 3:26 pm

ThnK YOU PCM:

So in order to call the function, I have to define a function as the following:

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

The variables that are in the function parameter list should be
used within the ASM code. You don't need to create another
group of variables and copy the parameters to them, as you
are doing.

I was sort of hoping that you would figure everything out
by yourself, once I pointed you to the sample code.

There are a few other things that have to be done to make
the code work. You should take out all the bank select code.
The compiler will insert its own bank select code, to access
the variables. You should take out the Return statement
at the end. The compiler will handle returning from the function.

The truth is, the code in that function is so simple that it could,
and should, be re-written in C. There's no reason for it to be
in assembly language. But I don't want to do that for you.
You should do it.

Guest · Posted: Tue Apr 05, 2005 6:53 am

Thank you PCM:

I am trying to learn the skill by you suggestion.

In the code, How Stack_0 was defined.

Guest · Posted: Tue Apr 05, 2005 8:12 am

Hi PCM:

From my question, you might already how I am lack of the knowlwdge of Assembly, and how hard it would be for me to start working on it, If you could kindly help me with this for both writing it in assembly and c, I will be much more appreciated.

I have many other subroutins like this, I just hope I could learn this one and do the others by my self

young · Joined: 24 Jun 2004 Posts: 285

Hi:

After struggling and asking questions from other forums, I am able to understand assembly language. I believe I will be able to transfer them to any other language including c. I will continuously fight with the code and find the pleasure after digging it out, certainly with you guys help!