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01/30/08 00:10
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 		 #150067 - PC Keyboard interface Has anyone done this ?
What I mean is, "Has anyone, themselves, actually done this?"

http://www.rasmicro.com/FTP/an434.pdf

I'm curious whether this is practical for a 20-pin or smaller device, given that I don't need IIC, and don't any any signals out other than STB and D(7..0) and don't need any inputs other than clock and data to/from the PC Keyboard. That's 10 I/O's. The app note uses about 50% more code space than the equivalent on an M68HC705J2A, to RS232 rather than IIC, but I can't get those right now ...

It seems that one should be able to use this code out of the can if it works at all. Not even one Philips app note I've tried has worked properly, though, so I'm worried.

I'd guess that one could forget about the IIC and just put the data and strobe out on a parallel port and call it good.

Have any of you guys done this in the past? Which small MCU did you use?

RE






List of 33 messages in thread
TopicAuthorDate
PC Keyboard interface Has anyone done this ?            01/01/70 00:00      
   basicly code works            01/01/70 00:00      
   timertick timeout not included            01/01/70 00:00      
   I wonder ...            01/01/70 00:00      
      dont know before, but now available            01/01/70 00:00      
      it is too bad search is temporarily disabled            01/01/70 00:00      
         Google still works            01/01/70 00:00      
            Really? How does that work?            01/01/70 00:00      
               Spiders and Robots            01/01/70 00:00      
                  I did that, and it promotes humility, believe me            01/01/70 00:00      
               try this for example            01/01/70 00:00      
                  Debouncing? Why?            01/01/70 00:00      
                     de-spiking inputs            01/01/70 00:00      
                        Oh yes there is!            01/01/70 00:00      
                           debouncing            01/01/70 00:00      
                        that won't work ... and that's now how it works            01/01/70 00:00      
                  8052.com PS2 code            01/01/70 00:00      
                     Debouncing            01/01/70 00:00      
               Google trick            01/01/70 00:00      
               RE: I must have missed something along the way.            01/01/70 00:00      
   well, at least            01/01/70 00:00      
      at least one reason for "dissapearing"            01/01/70 00:00      
         Oh yes there is!            01/01/70 00:00      
   Why bother?            01/01/70 00:00      
      not serial for serial...            01/01/70 00:00      
         Exactly!            01/01/70 00:00      
            I guess you want a "bridge" then            01/01/70 00:00      
            get the 8042            01/01/70 00:00      
               it isn't that simple.            01/01/70 00:00      
                  socket            01/01/70 00:00      
                     it fits the socket, and the board is wire-wrapped            01/01/70 00:00      
                  isn't this replacement?            01/01/70 00:00      
                     Gee ... that's where I got 'em last time ...            01/01/70 00:00      

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