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???
12/03/07 07:56
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 		 #147763 - Table lookup in 'C'
Responding to: ???'s previous message
Esko Ilola said:
... using table lookups, and that IS costly on C ...

There is no reason why a table lookup should be inherently "costly" in 'C' - especially not the type of looked required to drive a 7-segment digit...

... is to be avoided during interrupts.

... and, therefore, no specific reason why it must inherently be avoided in ISRs


List of 25 messages in thread
TopicAuthorDate
how to use buffer or stack to store digits            01/01/70 00:00      
   many question            01/01/70 00:00      
   Stack            01/01/70 00:00      
   use register as a pointer to a table            01/01/70 00:00      
      How many segments?            01/01/70 00:00      
         you seldom need to use both ...            01/01/70 00:00      
            Not as DP, but...            01/01/70 00:00      
               sorry ... double post            01/01/70 00:00      
               Why would you want those?            01/01/70 00:00      
                  example            01/01/70 00:00      
      Timer interrupt and segments in RAM            01/01/70 00:00      
         many words about two lousy microseconds            01/01/70 00:00      
            Lousy microseconds            01/01/70 00:00      
               Wholehardely agree            01/01/70 00:00      
                  Burning stack bytes            01/01/70 00:00      
                     you need to read "the bible"            01/01/70 00:00      
                        Not entirely true            01/01/70 00:00      
                     Table lookup in 'C'            01/01/70 00:00      
                        Why tables can be costly on C            01/01/70 00:00      
                           Well, If you abuse the tools...            01/01/70 00:00      
                           if we consider this off topic, you may be correct            01/01/70 00:00      
                              Not even then?            01/01/70 00:00      
                                 Another thread, please            01/01/70 00:00      
                                    And the new thread is...            01/01/70 00:00      
   Example on driving 7-segment displays            01/01/70 00:00      

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