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All about PIC microcontrollers

Within these pages, you can find many useful pieces of code mostly in assembly for the Microchip PIC micro controller family. A lot of people have spend many hours trying to put the bits and bytes together. If the code is NOT written by a member of the PCB Heaven community, then a link will be added above the code with the original website that this code was found.
Because the code is copied to our servers, you should know that:

  • The responsible web master of the website that the code is taken, has been informed and he has agreed to copy the code
  • All emails from the above contact have been kept as records but due to personal privacy cannot be shown in public.
  • The author of the code is always clearly indicated above the code. In some cases the author is unknown. If you happen to be the author of the code or you know the person who wrote it, please inform us by email and it will be added ASAP.

We would personally like to send the credits to all the people that managed to write some very interesting code and publish it, and special thanx to the people that originally hosted those code snippets and gave us the permission to copy them.


View code
2 digit Hex to Binary 8 bits
Author: Peter F.
This code was originally located @ http://www.piclist.com


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;convert 2 hex ascii characters to an 8-bit value
;ascii stored in hichar/lochar, result returned in w
;hichar/lochar are unchanged
ascii2byte
swapf hichar,w ;swap hi nibble into result
btfsc hichar,6 ;check if in range 'A'-'F'
addlw 0x8F ;add correction swapf ('1'-'A'+1)
addwf lochar,w ;add lo nibble
btfsc lochar,6 ;check if in range 'A'-'F'
addlw 0xF9 ;add correction '9'-'A'+1
addlw 0xCD ;adjust final result -0x33
return

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