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???
05/07/08 22:24
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 		 #154552 - UART doesn't know ASCII
Responding to: ???'s previous message
Chris Bertrand said:
Now I know you can not have something like '7B' since that is an invalid ascii character.

There is nothing to stop you sending the hex byte value 0x7B through the 8051's UART.

The 8051's UART neither knows nor cares about ASCII - it simply sends & receives 8-bit bytes.

The same applies to the PC's UART (assuming it is configured for 8-bit data).

Where ASCII comes in is how the software beyond the UARTs interprets those 8-bit bytes...

List of 35 messages in thread
TopicAuthorDate
Problem with the toascii() w/ clarification            01/01/70 00:00      
   toascii not what you want            01/01/70 00:00      
      Ah yes.....makes sense            01/01/70 00:00      
         C does know ASCII            01/01/70 00:00      
            the final result:            01/01/70 00:00      
               That is a LOT of code            01/01/70 00:00      
                  It won't compile in its state because...            01/01/70 00:00      
               Grossly inefficient!            01/01/70 00:00      
                  A small trick            01/01/70 00:00      
                     small trick is cool.....            01/01/70 00:00      
                        Same as Neil's            01/01/70 00:00      
                           Ah makes sense.....            01/01/70 00:00      
                              You can still do better            01/01/70 00:00      
                                 LOL....Russ.......LOL            01/01/70 00:00      
                                    sprintf()            01/01/70 00:00      
                                       I had you at <>            01/01/70 00:00      
                                          So why not sprintf()?            01/01/70 00:00      
                                             You are right......I did say that            01/01/70 00:00      
                        How the small trick works            01/01/70 00:00      
                           Is it worth it?            01/01/70 00:00      
                              Same assembly generated for me            01/01/70 00:00      
                           You said index.....click click....very nice            01/01/70 00:00      
                              fast (sic?) lookup table            01/01/70 00:00      
                                 Faster? Probably not.            01/01/70 00:00      
               What's in a name?            01/01/70 00:00      
                  true.....but at this point.......            01/01/70 00:00      
                     Tricks and treats            01/01/70 00:00      
                     there is no time lost by doing it right            01/01/70 00:00      
                        You guys are completely right,            01/01/70 00:00      
                           the very simple way to (almost) do it right            01/01/70 00:00      
                           For the sake of learning            01/01/70 00:00      
                              Good point            01/01/70 00:00      
   UART doesn't know ASCII            01/01/70 00:00      
      Good point....but            01/01/70 00:00      
   Unhelpful documentation            01/01/70 00:00      

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