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???
09/19/06 18:56
Modified:
  09/19/06 18:58
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 		 #124611 - overly complicated KISS
Responding to: ???'s previous message
I set each column high in turn, and check to see if P1 == 0xFF after each column goes high.
That's how I figure out which column I'm dealing with.

That is overly complicated KISS. I now see what you are doing you are first using rows as outputs, then you switch to columns as outputs. Why not keep it straight and keep one as output and the other as input?

Erik

PS you do know that the P89LPC3xx has a dedicated 8 input keyboard interrupt, saving you the negative OR.


List of 60 messages in thread
TopicAuthorDate
AND gate, INT0            01/01/70 00:00      
   Some thoughts            01/01/70 00:00      
      Should have stated..            01/01/70 00:00      
         Pullups            01/01/70 00:00      
            I'm a DUMMY            01/01/70 00:00      
   Port modes            01/01/70 00:00      
      Thanks, Kai            01/01/70 00:00      
      I was wrong again            01/01/70 00:00      
         are you too fast?            01/01/70 00:00      
            OK            01/01/70 00:00      
            does this look too fast?            01/01/70 00:00      
               depends on            01/01/70 00:00      
                  idea            01/01/70 00:00      
                     no            01/01/70 00:00      
                        but            01/01/70 00:00      
                           are you looking for \'pressed key high\'?            01/01/70 00:00      
                              Detecting            01/01/70 00:00      
                                 yes            01/01/70 00:00      
                                    Ah, slightly different            01/01/70 00:00      
                                       I tried to read what you posted            01/01/70 00:00      
                                          to clarify            01/01/70 00:00      
                                             overly complicated KISS            01/01/70 00:00      
                                                when..            01/01/70 00:00      
                                             that will be all rows OR all columns plus one of t            01/01/70 00:00      
                                                I'll try again            01/01/70 00:00      
                                                   got it, but            01/01/70 00:00      
                                                   Heavily unsuited!            01/01/70 00:00      
                                                      Well            01/01/70 00:00      
                                                      OR            01/01/70 00:00      
                                                         Still unsuited...            01/01/70 00:00      
                                                            I Think....            01/01/70 00:00      
                                                               and now you will make a better one and ....            01/01/70 00:00      
                                                                  If it's bad, toss it!            01/01/70 00:00      
                                                               No shame at all!            01/01/70 00:00      
                                                            well, any decent code will do the two steps            01/01/70 00:00      
               too fast?            01/01/70 00:00      
   why to the hell ?            01/01/70 00:00      
      Before sending somebody to hell, read carefully!            01/01/70 00:00      
         leave idle by timer            01/01/70 00:00      
            debounce            01/01/70 00:00      
   Other method            01/01/70 00:00      
      Oh            01/01/70 00:00      
   a language lesson and some general co0mments            01/01/70 00:00      
      Don't be silly...            01/01/70 00:00      
         as I said            01/01/70 00:00      
            Erik, please!            01/01/70 00:00      
               I said nothing about an AND gate            01/01/70 00:00      
                  Have fun...            01/01/70 00:00      
                  well,            01/01/70 00:00      
                     No, it does not            01/01/70 00:00      
                     You are right, Mark            01/01/70 00:00      
                        if so, wht are there two symbols ?            01/01/70 00:00      
                           So what?            01/01/70 00:00      
                              because some of us want to show the intention            01/01/70 00:00      
                                 Intentions            01/01/70 00:00      
                                    chip and function            01/01/70 00:00      
                                       Sorry, but this becomes more and more ridiculous            01/01/70 00:00      
                                          that a correct description makes the function            01/01/70 00:00      
      wait a minute...            01/01/70 00:00      
   I just recall            01/01/70 00:00      

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