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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Record initialisation question
Date: Sat, 9 Jan 2021 11:46:23 +0100
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On 2021-01-09 10:30, DrPi wrote:
> Hi,
> 
> I'm working on a µP BSP. The boot sequence of this µP requires byte 
> structures located in FLASH memory.
> For example :
> 
>     type t_Dcd_Header is record
>        Tag     : Unsigned_8  := 16#D2#;
>        Length  : Unsigned_16 := 4;      -- Length in byte of the DCD 
> structure (this header included)
>        Version : Unsigned_8  := 16#41#;
>     end record
>       with Object_Size => 32,
>            Bit_Order => System.Low_Order_First;
> 
>     for t_Dcd_Header use record
>        Tag     at 0 range  0 .. 7;
>        Length  at 0 range  8 .. 23;
>        Version at 0 range 24 .. 31;
>     end record;
> 
> The t_Dcd_Header is part of t_Dcd record.
> The Length field of t_Dcd_Header must contain the length of t_Dcd.
> 
>     Dcd : constant t_Dcd :=
>      ( Dcd_Header => ( Length => ???, -- Length of Dcd
>                        others => <>),
>        ...
>      );
> 
> Is there a way to automatically set Length ?

t_Dcd'Max_Size_In_Storage_Elements?

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de