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???
02/23/08 20:28
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 		 #151351 - consts in other than CODE space
Responding to: ???'s previous message
Andy Neil said:
So how do you get a something to be read-only, but not in CODE space?


Why would you want to? Granted, I just woke up and am a little groggy but nothing's coming immediately to mind.

Nothing came immediately to mind when I wrote that, which was why I didn't give any examples!

But, having thought about it, there are several possibilities:

  • An XDATA memory-mapped read-only port;

  • ROM mapped into XDATA space;

  • If you needd a fast lookup table, where CODE space was too slow (obvisouly, only a small table).

    I dare say there are others...

    • List of 54 messages in thread
    TopicAuthorDate
    Best way to consolidate....out of memory            01/01/70 00:00      
       isn't this the classical gotcha?            01/01/70 00:00      
       There was a hint here....            01/01/70 00:00      
          Not const            01/01/70 00:00      
             Not necessarily            01/01/70 00:00      
                Hmmm...            01/01/70 00:00      
                   Hmmm, indeed            01/01/70 00:00      
                   Why?            01/01/70 00:00      
                      One reason ... and the prolly the original intent            01/01/70 00:00      
                         Obviously            01/01/70 00:00      
                            Speed            01/01/70 00:00      
                               Rogue programs?            01/01/70 00:00      
                                  Yes. And stupid programmers            01/01/70 00:00      
                                     True            01/01/70 00:00      
                               cases            01/01/70 00:00      
                            The Obvious...            01/01/70 00:00      
                               Fair enough            01/01/70 00:00      
                                  make sure the developer doesn't do something stupi            01/01/70 00:00      
                                  Const to Code EPROM or FLASH,,,            01/01/70 00:00      
                               const and volatile - for optimization            01/01/70 00:00      
                      consts in other than CODE space            01/01/70 00:00      
                         Use the extended keywords            01/01/70 00:00      
                            'const' and 'volatile'            01/01/70 00:00      
       Unreadable code!            01/01/70 00:00      
          It really was all Keils fault....;)            01/01/70 00:00      
       You don't want to start from here!            01/01/70 00:00      
          Previously, on 8052.com...            01/01/70 00:00      
          Array of string            01/01/70 00:00      
             Yes, my mistake            01/01/70 00:00      
       string concatenate            01/01/70 00:00      
          Comments            01/01/70 00:00      
             Wow......LOL            01/01/70 00:00      
                Not a C vs ASM thing            01/01/70 00:00      
                   From your perspective, it may make sense            01/01/70 00:00      
          I went this direction....code padding removal?            01/01/70 00:00      
             For but one byte added to the array...            01/01/70 00:00      
             With proper ordering in source file...            01/01/70 00:00      
             Putting it all together            01/01/70 00:00      
                Spectacular Russ.....            01/01/70 00:00      
       THINK            01/01/70 00:00      
          that is surely needed            01/01/70 00:00      
          A bit easier to read?            01/01/70 00:00      
             easy to read???            01/01/70 00:00      
          typedef vs #define            01/01/70 00:00      
          I think not            01/01/70 00:00      
             Tks Russ.            01/01/70 00:00      
                THINK(ing)            01/01/70 00:00      
                   ???            01/01/70 00:00      
                      Objectives.            01/01/70 00:00      
                         I beg your pardon?!            01/01/70 00:00      
                         I see            01/01/70 00:00      
       Best way to consolidate....out of memory            01/01/70 00:00      
       Why specify CODE for functions?            01/01/70 00:00      
          there is so much stuff            01/01/70 00:00      

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