IO-PORTS

IO-PORTS

[Qwerty]

Hi,

I have to make an ADA-program for school. The program requires to 
connect 2 computers and to let them communicate through the COM1-port.

How do you read/write from/to the COM1-port. It must be programmed on a 
low level. So we have to read/write directly from/to the IOports with 
adresses 16#03F8# to 16#03FD#.

How do you do that in Ada ?




Thanx,
Alexander

Re: IO-PORTS

[Preben Randhol]

On Mon, 13 May 2002 16:15:19 +0200, Qwerty wrote:
> Hi,
> 
> I have to make an ADA-program for school. The program requires to 
> connect 2 computers and to let them communicate through the COM1-port.
> 
> How do you read/write from/to the COM1-port. It must be programmed on a 
> low level. So we have to read/write directly from/to the IOports with 
> adresses 16#03F8# to 16#03FD#.
> 
> How do you do that in Ada ?

What does your text book say?

Preben
-- 
"Jeg tror nordmenn har glemt hvordan de tilbreder fisk. De er mest
 opptatt av firkantet fisk."
  --  Kristian Kristiansen, yrkesfisker, aftenposten.no 19/04/02

Re: IO-PORTS

[Qwerty]

Preben Randhol wrote:
> On Mon, 13 May 2002 16:15:19 +0200, Qwerty wrote:
> 
>>Hi,
>>
>>I have to make an ADA-program for school. The program requires to 
>>connect 2 computers and to let them communicate through the COM1-port.
>>
>>How do you read/write from/to the COM1-port. It must be programmed on a 
>>low level. So we have to read/write directly from/to the IOports with 
>>adresses 16#03F8# to 16#03FD#.
>>
>>How do you do that in Ada ?
> 
> 
> What does your text book say?
> 
> Preben

It's not in it :(

Alexander

Re: IO-PORTS

[Stephen Leake]

Qwerty <alexanderdupont@yahoo.com> writes:

> Hi,
> 
> I have to make an ADA-program for school. The program requires to
> connect 2 computers and to let them communicate through the COM1-port.
> 
> How do you read/write from/to the COM1-port. It must be programmed on
> a low level. So we have to read/write directly from/to the IOports
> with adresses 16#03F8# to 16#03FD#.
> 
> How do you do that in Ada ?

What operating system are you using? Since you say "COM1", it's
probably either DOS or Windows.

If DOS, I have no idea. If Windows, you can use my com ports package,
assuming it's ok for you to reuse stuff off the net:

http://users.erols.com/leakstan/Stephe/Ada/win32_com_ports.zip

But this does not "write directly to the IO port". You can't do that
in Windows!

-- 
-- Stephe

Re: IO-PORTS

[Qwerty]

I'm using DOS & Linux (it is not possible in windows to do that 
directly, as you 've said). It's not ok to use a package, I really have 
to do it myself. But thanks anyway for the help.

Alexander


Stephen Leake wrote:
> Qwerty <alexanderdupont@yahoo.com> writes:
> 
> 
>>Hi,
>>
>>I have to make an ADA-program for school. The program requires to
>>connect 2 computers and to let them communicate through the COM1-port.
>>
>>How do you read/write from/to the COM1-port. It must be programmed on
>>a low level. So we have to read/write directly from/to the IOports
>>with adresses 16#03F8# to 16#03FD#.
>>
>>How do you do that in Ada ?
> 
> 
> What operating system are you using? Since you say "COM1", it's
> probably either DOS or Windows.
> 
> If DOS, I have no idea. If Windows, you can use my com ports package,
> assuming it's ok for you to reuse stuff off the net:
> 
> http://users.erols.com/leakstan/Stephe/Ada/win32_com_ports.zip
> 
> But this does not "write directly to the IO port". You can't do that
> in Windows!
> 

Re: IO-PORTS

[Darren New]

Stephen Leake wrote:
> But this does not "write directly to the IO port". You can't do that
> in Windows!

You can do it in Win98, but not the multi-user windows OSes like
Win2000.

-- 
Darren New 
San Diego, CA, USA (PST). Cryptokeys on demand.
** http://home.san.rr.com/dnew/DNResume.html **

   The 90/10 rule of toothpaste: the last 10% of 
         the tube lasts as long as the first 90%.

Re: IO-PORTS

[tmoran]

> What operating system are you using? Since you say "COM1", it's
> probably either DOS or Windows.
>...
> But this does not "write directly to the IO port". You can't do that
> in Windows!
  If you really want to write directly you'll need to use the CPU's IO
instructions.  Look at your compiler's docs for their library routines
for that.  If your compiler lacks such a library, you'll have to use
Machine Code Insertions.  IIRC you can access the COM ports directly in
Windows 95 - from the "DOS box" at the least.  Windows may emulate the
IO instructions so speed might be a problem.  To get *useful* access
under Windows you need to write a Windows Device Driver.

Re: IO-PORTS

[Sergey Koshcheyev]

"Qwerty" <alexanderdupont@yahoo.com> wrote in message
news:3CE000C0.4020602@yahoo.com...
> I'm using DOS & Linux (it is not possible in windows to do that
> directly, as you 've said). It's not ok to use a package, I really have
> to do it myself. But thanks anyway for the help.


You have to use machine code insertions, the exact syntax depends on what
compiler you use. For GNAT, there was a tutorial somewhere on
http://www.adapower.com/.

Sergey.

Re: IO-PORTS

[Michal Nowak]

On 2002-05-13 at 20:06 Qwerty wrote:

>I'm using DOS & Linux 

Concerning Linux, you should find something interesting at:
http://www.pegasoft.ca/homes/book.html
That's really good resource of Ada Linux information.

Happy Ada programming,
Mike

Re: IO-PORTS

[Jeffrey Carter]

Qwerty wrote:
> 
> I'm using DOS & Linux (it is not possible in windows to do that
> directly, as you 've said). It's not ok to use a package, I really have
> to do it myself. But thanks anyway for the help.

In DOS, you have a couple of options

1. Use a package supplied by the compiler vendor to access the IO ports.
2. Write a machine code insertion to access the IO ports

You may also be able to open a file named "COM1:", but may have trouble
reading and writing from the same port.

-- 
Jeff Carter
"Now go away or I shall taunt you a second time."
Monty Python & the Holy Grail