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???
09/14/06 11:20
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 		 #124286 - I'll try it in other way
Responding to: ???'s previous message
Arvind,

as Russell said above, there is no need for comments like "mov a, p1 ; mov the value of p1 to acc" - we know what the instruction does. You should've written "mov a, p1 ; read state of both columns and rows" or similar.

But apparently you still have that strange kind of "programmer's blindness". So, let's play: remove the microcontroller and pretend that YOU are the microcontroller. Connect "yourself" (use a scope or a multimeter or a continuity beeper or similar) to the matrix keyboard's leads, cover the keyboard and ask somebody to press a key without telling you; now try to figure out, which key was pressed.

Have fun!

Jan Waclawek


List of 27 messages in thread
TopicAuthorDate
Matrix Keyboard not working            01/01/70 00:00      
   the logic            01/01/70 00:00      
   Lots of problems            01/01/70 00:00      
      no, it's completely bad in concept            01/01/70 00:00      
      Does the LCD Work?            01/01/70 00:00      
      enphasizing            01/01/70 00:00      
   commented code            01/01/70 00:00      
      Persistance my friend            01/01/70 00:00      
         I'll try it in other way            01/01/70 00:00      
            I'll make the corrections            01/01/70 00:00      
      Note on comments            01/01/70 00:00      
         bad, very bad - yes, but not necessarily because            01/01/70 00:00      
            Subroutine Details            01/01/70 00:00      
               I don't know            01/01/70 00:00      
                I do not know what that information is good for.            01/01/70 00:00      
                  Column scan after ROW confirmation            01/01/70 00:00      
                     Maybe the problem is not here            01/01/70 00:00      
      more Informative code            01/01/70 00:00      
         Comments are better            01/01/70 00:00      
         The Algorithm            01/01/70 00:00      
            This isn\'t necessarily true ...            01/01/70 00:00      
               a correct pain in the gluteus maximus            01/01/70 00:00      
                  Why so much pain?            01/01/70 00:00      
               An exercise for the student            01/01/70 00:00      
               everyone else            01/01/70 00:00      
   Does the LCD Work?            01/01/70 00:00      
      LCD is fine            01/01/70 00:00      

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