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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: setting an address with pure?
Date: Tue, 14 Jul 2015 08:38:36 +0100
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Date: 2015-07-14T08:38:36+01:00
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"RasikaSrinivasan@gmail.com" <RasikaSrinivasan@gmail.com> writes:

> Does it have to be pure?
>
> I use Pragma Restrictions( No_Elaboration_Code );

I don't have any objection to elaboration code per se, I just wanted to
get as near to Pure as I could.

I did use that restriction for a Cortex Reset_Handler, which is called
by the hardware before any elaboration occurs at all.

> then :
>
>    DACMAP : DAC_CR_Type
>           with Volatile ,
>           Address => System'To_Address( 16#NNNN_NNNN# ) ;
>
> I am not sure if this is what you are aiming for but appears to work
> so for. NNNN_NNNN above is the base address of the DAC map as provided
> by the STM32 Ref Manual.

This was just what I wanted, thanks very much!

This is actually in the secret documentation: I would refer to the
gcc.gnu.org version, but it's unreachable at this moment.

http://docs.adacore.com/gnat_rm-docs/html/gnat_rm/gnat_rm/implementation_defined_attributes.html#attribute-to-address