Note that this is great, but according to ANSI  sizeof(Bits) == sizeof(int),
not sizeof(Bits) == sizeof(char).

Also according to ANSI, int must be at least a 16-bit value.

Bob Ammerman
RAm Systems

----- Original Message -----
From: "Ashley Roll" <ash@DIGITALNEMESIS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, December 03, 2001 3:30 PM
Subject: Re: [pic]:Accessing a var as a byte or bits in C


> Hi
>
> typedef union {
>         struct {
>                 int Bit0 : 1;
>                 int Bit1 : 1;
>                 int Bit2 : 1;
>                 int Bit3 : 1;
>                 int Bit4 : 1;
>                 int Bit5 : 1;
>                 int Bit6 : 1;
>                 int Bit7 : 1;
>         } Bits;
>         unsigned char Value;
> } BitDataByte;
>
> BitDataByte myData;
>
> myData.Value = 42;
>
> myData.Bits.Bit0 = 1;
>
> Will get you started.. the ": 1" tells the compiler to allocate 1 bit to
the
> element, but you can allocate any number. So you can have a 2 or 3 or 14
bit
> number as you choose. more details should be in your local C language book
> :)
>
> Cheers,
> Ash.
>
> ---
> Ashley Roll
> Digital Nemesis Pty Ltd
> www.digitalnemesis.com
> Mobile: +61 (0)417 705 718
>
>
>
>
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Sean H. Breheny
> > Sent: Tuesday, 4 December 2001 8:47 AM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [pic]:Accessing a var as a byte or bits in C
> >
> >
> > What is the syntax? I've been using C for 9 years (mostly on
> > PCs but also
> > on microcontrollers) and don't recall ever seeing it!
> >
> > Sean
> >
> > At 03:43 PM 12/3/01 -0500, you wrote:
> > >Normal C has bitfields in it. Usually you use them in
> > structs or unions.
> > >Problem is you don't usually know which bit is assigned, so I prefer
> > >assembly at that level of detail.
> > >/\/\/\/*=Martin
> >
> > ----------------------------------------------------
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> >
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