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From: Kris Hermans <kris.hermans@cs.kuleuven.ac.be>
Subject: interrupt handling and COM port
Date: 1998/11/04
Message-ID: <36405C45.81D74935@cs.kuleuven.ac.be>#1/1
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Date: 1998-11-04T13:53:10+00:00
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Hello,

I`m trying to write 2 programs that communicate through a serial line on
COM2 (2 PC`s with MS_DOS, I use GNAT310).

I believe I can set up the ports correctly, but my problem is to attach
an interrupt handler correctly.  I use the following construct:
protected type Interrupt_Interface(Int_Id: Interrupt_Id)
  entry Read_N(N: out Natural);
  entry Write_N(N: in Natural);
  private
    entry Done(N: out Natural);
    procedure Handler;
    pragma Attach_Handler(Handler, Int_Id);
    Interrupt_Occurred: Boolean := False;
    Next_Request: Boolean := True;
  end Interrupt_Interface;

Every time PC1 writes a number to the line, PC2 gets an interrupt and
reads the number for further use.  The problem is that I don`t know what
to use for Int_Id.  I don`t think it is predefined in Interrupt.Names

Do you know the solution to this or do you have written similar programs
in ADA95? I would appreciate it if you mailed it to me.

friendly regards,

Kris.Hermans@cs.kuleuven.ac.be