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Newsgroups: comp.lang.ada
Date: Fri, 24 Jan 2020 02:04:18 -0800 (PST)
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Subject: Re: Creating several types from a base type and conversion
From: AdaMagica <christ-usch.grein@t-online.de>
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Xref: reader01.eternal-september.org comp.lang.ada:57932
Date: 2020-01-24T02:04:18-08:00
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Am Freitag, 24. Januar 2020 10:35:04 UTC+1 schrieb Ken Roberts:
> It was my understanding that big/little-endian representations were mainly how
> data was accessed from memory that used 8-bit bytes for physical memory layout.
> 
> Using a 16-bit register as an example:
> 
> register: [first byte][second byte]

Assuming the register is interpreted as a signless whole number, first byte is the MSB, second byte the LSB.
> 
> In big-endian format the memory usage would be:
> 
> adx 0: [first byte]     MSB
> adx 1: [second byte]    LSB
> adx 2: [first byte]
> adx 3: [second byte]
> 
> In little-endian format the memory usage would be:
> 
> adx 0: [second byte]    LSB
> adx 1: [first byte]     MSB
> adx 2: [second byte]
> adx 3: [first byte]
> 
> Is my understanding off?

So it's OK. See
https://en.wikibooks.org/wiki/Ada_Programming/Attributes/%27Bit_Order