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???
02/23/08 19:44
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 		 #151347 - Rogue programs?
Responding to: ???'s previous message
Russ Cooper said:
But on the 8051, the only way for a program to access code memory is with either MOVC A,@A+PC or MOVC A,@A+DPTR. That's a pretty expensive ordeal when compared with all the speedy variants of MOV that manipulate internal data memory. I think that's why you might want to have a 'const' element that's not in code memory.


True, but then just put it in internal memory and don't modify it. Again, my question would be whether "const" is just to protect against rogue programs modifying variables they know they shouldn't modify?

Regards,
Craig Steiner


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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