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???
05/07/08 19:58
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Msg Score: +1
 +1 Good Answer/Helpful		 #154550 - toascii not what you want
Responding to: ???'s previous message
I have not used toascii but it appears that all it does is mask what is passed to it with 0x7F. I don't think this is what you want to do, I would suggest just making the function yourself. It seems you are wanting to convert hex values 0x00-0x09 to hex values 0x30-0x39 and hex values 0x0A-0x0F to hex values 0x41-0x46. Something like:

Save This Code
unsigned char Hex2Ascii(unsigned char HexValue)
{
   HexValue &= 0x0F;            // Mask the upper nibble
   if (HexValue <= 0x09)        // For numbers 0 - 9
   {
      return(HexValue + 0x30);  // Return the ascii value for the digits
   }
   else                         // For letters A - F 
   {
      return(HexValue + 0x37);  // Return the upper case ascii values
   }
}

Chris Bertrand said:

uart_transmit('B'); //the SBUF shows 0x42 as it should

The reason this works is because uart_trasmit is actually being passed 0x42, the ascii value for the character B.

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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