[Q] com port function or procedure

[Q] com port function or procedure

[Hee]

Hi, I'm working in Korea.

C language have com port function such as "outportb" and "inportb".
Do Ada language have any com port function or procedure?

Re: [Q] com port function or procedure

[Gisle S�lensminde]

In article <jB98S2nk$GA.257@news.thrunet.com>, Hee wrote:
>Hi, I'm working in Korea.
>
>C language have com port function such as "outportb" and "inportb".
>Do Ada language have any com port function or procedure?

If you search on www.deja.com for questions on com/parallel/serial ports,
you will see that this question has been asked several times before
in this group. You will also find several answers. 

Well, C does in fact _not_ have these functions. These functions
probably comes with your operating system, and is not a part of C.
If you move code using these functions to a different OS, your C code
will no longer work.

If you want to use these functions from Ada, you must write an 
interface to them. The package standard Ada95 package interfaces.C
and pragma import/export do that.

In addition you must link with the library containing these 
functions. How to do that depent on operating system.

The issue of accessing hardware like this is generally dependent
on the operating system. Maybe someone recognize the function
names and can give you a more precise answer.

P.S: shouldn's this one be in the FAQ? Maybe I should try to submit 
an answer to the FAQ. (or someone else)


-- 
--
Gisle S�lensminde ( gisle@ii.uib.no )   

ln -s /dev/null ~/.netscape/cookies

Re: [Q] com port function or procedure

[Gautier]

Hee wrote:

> C language have com port function such as "outportb" and "inportb".
> Do Ada language have any com port function or procedure?

You can reach the C function via pragma e.g.

   procedure Outportb(Port : in Unsigned_16; Data : in Unsigned_8);
   pragma Import(C, Outportb, "outportb");

BTW: is it really in every C implementation ? ("C language have...")
______________________________________________________
Gautier  --  http://members.xoom.com/gdemont/gsoft.htm