Re: [avr-gcc-list] Order of bytes

[Gre7g Luterman]

AVR is a little-endian processor family, so the first
byte in memory of a multi-byte value is the LSB.  That
would be by0 in your example since union will not
re-arrange anything on you.  by3 would be the MSB.

HTH,
Gre7g

--- Royce Pereira <address@hidden> wrote:

> Hi,
> 
> Sorry for my rusty C,
> 
> In the following union
> 
> union
>      {
>         uint32_t as_ul;
> 
>       struct
>          {
>               uint8_t by0;
>               uint8_t by1;
>               uint8_t by2;
>               uint8_t by3;
>          }
>       asbyte;
>       }
>     lvar;
> 
> What is the order of the bytes? by0= MSB, or by3=
> MSB ?
> AVR stores low byte at the lower address. Is this
> order retained in the above example?
> 
> Thanks,
> 
> --Royce
> 
> -- 
> Using Opera's revolutionary e-mail client:
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> 
> 
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>
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> 


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