On Mon, 3 Dec 2001 15:43:05 -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.
>/\/\/\/*=3DMartin

Hitech allows bit vars to be declared, and also to be assigned to
fixed addresses for hardware, e.g.=20
static volatile bit     GP5     @ (unsigned)&GPIO*8+5;

GP5 =3D 1;
generates BSF GPIO,5=20

Unfortunately you can't use the @ operator on vars whose address is
not known at compile time, so this doesn't solve the original problem.


>----- Original Message -----
>From: "Sean H. Breheny" <shb7@CORNELL.EDU>
>To: <PICLIST@MITVMA.MIT.EDU>
>Sent: Monday, December 03, 2001 3:27 PM
>Subject: Re: [pic]:Accessing a var as a byte or bits in C
>
>
>> Hi Andrew,
>>
>> Is this specific to HiTech? I have never seen a "normal" C compiler =
which
>> had a bit variable type, and I thought that either the ANSI or K&R
>> standards did not call for such a type.
>>
>> Sean
>>
>> At 11:31 AM 12/3/01 -0700, you wrote:
>> >Re:
>> >
>> >>In Hitech C, is it possible to access the same variable as two
>> >>different types in C, specifically bits and bytes ?
>> >>For example I want some bit variables for various option flags, but
>> >>want to access them all as a single byte when saving/loading them to
>> >>eeprom.
>> >>
>> >>Can unions be used to do this ?
>> >
>> >
>> >Yes.
>> >--
>> >
>> >  ______________________________________
>> >   Andrew E. Kalman, Ph.D.   aek@pumpkininc.com
>> >
>> >--
>> >http://www.piclist.com hint: PICList Posts must start with ONE topic:
>> >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
>> >
>>
>> ----------------------------------------------------
>> Sign Up for NetZero Platinum Today
>> Only $9.95 per month!
>> http://my.netzero.net/s/signup?r=3Dplatinum&refcd=3DPT97
>>
>> --
>> http://www.piclist.com hint: PICList Posts must start with ONE topic:
>> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
>>
>>

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads