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???
09/19/06 18:51
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 		 #124609 - to clarify
Responding to: ???'s previous message

I'm not detecting that a key was pressed with a high.
I'm DECODING which key was pressed with a high.
Keep in mind that this whole shebang is kicked off by an external interrupt which is NEGATIVE OR'ed (heh heh) with the rows. Therefore when the keypad scan commences, a row will be low.

When a button is pressed, P1 != 0xFF
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.


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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