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???
12/02/07 09:29
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 		 #147704 - we've used it in the miniLA project
Responding to: ???'s previous message
http://minila.sourceforge.net/

PC via LPT in EPP sucks out data from the "LA"'s memory, at a rate about 100kB/s - that's about the maximum what you can squeeze out of it (this means you have to wait around 5 seconds to read out the whole memory of miniLA). The nice thing is that it allowed to implement "registers" in the CPLD accessed from PC, and a relatively simple and transparent interfacing to them.

Nevertheless, as you can see on those pages yourself, people moved to USB (based on the hillarious FTDI chips) since then, as even the Full Speed mode (which is often mis-named as "USB 1.1") these chips support, allows around 1Mbyte/s, and the tenfold increase in speed is worth the hassle.

Look at the FT2232 - it has a '51-like mode, so you can create a module, plug it in place of your '51 and drive all the peripherals out of the PC via USB...

0.02SKK

JW



List of 30 messages in thread
TopicAuthorDate
... ahem .... Has anyone used EPP mode lately?            01/01/70 00:00      
   EPP for what ? programming 8051            01/01/70 00:00      
      for ANYTHING at all            01/01/70 00:00      
         Its fast            01/01/70 00:00      
            Maybe, but ...            01/01/70 00:00      
   Scanners?            01/01/70 00:00      
      did you build the scanner?            01/01/70 00:00      
         Oh, I see            01/01/70 00:00      
   we've used it in the miniLA project            01/01/70 00:00      
      perhaps you've underestimated it            01/01/70 00:00      
         What's your PC programming environment?            01/01/70 00:00      
            I don't trust Windows ...            01/01/70 00:00      
               good idea - if ...            01/01/70 00:00      
                  With LPT in EPP mode ...            01/01/70 00:00      
                     that's not quite the case            01/01/70 00:00      
                  Windows doesn't like direct I/O            01/01/70 00:00      
                     there are ways...            01/01/70 00:00      
                        That's one of many pages ...            01/01/70 00:00      
                        inpout32.dll            01/01/70 00:00      
                           Really?            01/01/70 00:00      
                              It\'s moot, since I don\'t use Windows for that            01/01/70 00:00      
            Too much hassle            01/01/70 00:00      
               If only USB were fast enough ...            01/01/70 00:00      
               the workhorse            01/01/70 00:00      
   Only I can tell is, ...            01/01/70 00:00      
      Interesting ...            01/01/70 00:00      
         Believe me, I was also surprised!            01/01/70 00:00      
            '245's are schmidt triggered, aren't they?            01/01/70 00:00      
               schmitt trigger on '245?            01/01/70 00:00      
                  There must be room for doubt ...            01/01/70 00:00      

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