Re: Is this a Legal Way to Access a Specific Address?

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Article #2117

#2117

From: Alan S. Mazer
Date: Mon, 25 Jan 1993 22:24

22 lines
1320 bytes

In article <1993Jan23.042626.991@verdix.com> scotty@verdix.com (Scott R. Chilcote) writes:
> 
>We're programming a device that has a RAM cache at address 809800H.
>
>Is it legal to address this memory in C as follows?
>
>#define ON_CHIP 0x809800
>
>int main(void)
>{
>
>   float *oc_ptr = (float *) ON_CHIP;

Excuse me, but the replies to this are getting silly.  The poster doesn't
have an int.  He has an integer constant.  Moreover, pointer arithmetic
doesn't apply here.  There is no arithmetic.  There is simply an assignment.
What he's proposing is fine.
-- 
 
-- Alan                        # Mountain Dew and doughnuts...
   ..!ames!elroy!alan          # because breakfast is the most important meal
   alan@elroy.jpl.nasa.gov     # of the day.

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Path: arc1-ca.pugleaf.net!sparky!uunet!pmafire!news.dell.com!natinst.com!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!alan
From: alan@elroy.Jpl.Nasa.Gov (Alan S. Mazer)
Newsgroups: comp.dsp,comp.lang.c
Subject: Re: Is this a Legal Way to Access a Specific Address?
Date: 25 Jan 1993 22:24:03 GMT
Organization: Image Analysis Systems Group, JPL
Lines: 22
Message-ID: <1k1pa3INNnl@elroy.jpl.nasa.gov>
References: <1993Jan23.042626.991@verdix.com> <1993Jan24.171455.9451@bilver.uucp>
NNTP-Posting-Host: cogswell.jpl.nasa.gov
Keywords: DSP, C, ANSI, Fixed RAM

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