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From: Alfred Hilscher <SPAM@alfred-hilscher.de>
Newsgroups: comp.lang.ada
Subject: Re: Bitordering? was Re: Bitmanipulation in Ada
Date: Mon, 23 Aug 2004 20:47:10 +0200
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Date: 2004-08-23T20:47:10+02:00
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Nick Roberts schrieb:
> 
> On Fri, 20 Aug 2004 22:57:40 +0200, Alfred Hilscher
> <SPAM@alfred-hilscher.de> wrote:
> 
>     ...
> 
> Does this help you?


Yes it does. Although it is not what I expected.

My first idea was something like this:

type flags is (buffer_empty, overrun, parity_error, frame_error,
timed_out, break_detected, receiving, idle);

type port is array (flags) of boolean;  pragma pack (port);

status_port : port;  for port use at 16#0004#;

...

for s in overrun .. break_detected
loop
  if status_port (s) 
  then 
    return flags'pos (s);
  end if;
end loop;

return 0;



So instead I have to write:

type port is record
       buffer_empty : boolean;
       ...
end record;

...

if status_port (overrun)
then
  return 7;
elsif status_port (parity_error)
then
  return 6;

...

else
  return 0;
end if;

Is this correct? Ok, it is a bit more to write, but this should not
matter.

Regards,
Alfred


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