Hey Bob,

How about:

  addlw 0x0C0                ;  Set Carry if 0x041-0x046 ("A" to "F")
  btfss  STATUS, C
   addlw  7                       ;  If Carry Not Set, 0x030-0x039 ("0" to
"9")
                                         ;   To Offset from A-F to 0-9
  addlw  9                        ;  Value is now 0-F

This, of course, assumes that the input value (in "w") is "0" to "9" or "A"
to "F".

I'll add this to my "PICMicro" Snippets page.

myke

-----Original Message-----
From: Bob Blick <bob@TED.NET>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Friday, May 28, 1999 5:48 PM
Subject: ascii hex to binary


>Does anyone have a nice code snippet that takes a byte containing a hex
>character (0x30 through 0x39 and 0x41 through 0x46) and converting it to a
>plain numeric byte, 0x00 through 0x0F? Everything that comes to mind seems
>wasteful and clunky.
>
>The character coming in may also contain junk that must be filtered out.
>
>Thanks!
>
>Happy long weekend if you get one. Cheers,
>Bob
>