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.
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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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