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???
12/02/07 16:11
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 		 #147726 - Wholehardely agree
Responding to: ???'s previous message
Having complex indexed loads while in interrupt does not only cost the time. It will also burn some bytes from Your stack - certainly more than those three needed in this case.
1) what is complex about q=r[s] or movc a,@A=dptr ? I have NEVER heard of a '51 interrupt "burn some bytes from Your stack"

The interrupt code should be made as simple as possible
Wholehardely agree, just 2 microseconds is hardly desimplifying.

and having some sort of conversions in there will add to the complexity. Debugging interrupts is not an easy task - not for the beginner at least. Debugging complex interrupts is really hard even for the experienced one.
1) a table lookup is hardly 'complex' 2) what is 'difficult? the ICE works the same in both places.

Erik

PS I mention "the ICE", for the VERSA read "the JTAG debugger"

PPS if you linuxify the bootloader, i doubt you will keep the JTAG debugger and whaevewr else I might feel were it me I would not lose that at any price.

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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