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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
8 Bit Binary to 2 ASCII digits
Author: Kuebek Tony
This code was originally located @ http://www.piclist.com
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***********************************************************************
;
; CONV_BYTE_HEX - Converts the byte in w to two ASCII hex digits ('0'-'9', 'A'-'F' )
; Returns with top nibble ASCII digit in char_hi and the bottom one inW
; NOTE uses TWO deep stack ( nested calls ) !!
CONV_BYTE_HEX
MOVWF char_hi ; save byte temporarily
SWAPF char_hi,W
; convert top nibble
CALL CONV_NIBBLE_HEX
; top nibble in w, exchange char_hi with w
XORWF char_hi,F
XORWF char_hi,W
XORWF char_hi,F
; and convert low nibble
CONV_NIBBLE_HEX
ANDLW 0x0F ; mask out top nibble, preserv low nibble
ADDLW 0xF6 ; add 246, to check if 0-9 or a-f, w=nibble+246
BTFSC STATUS,C ; if carry set then a-f
ADDLW 0x07 ; carry set, then add 7, w=nibble+246+7 ( note nibble known to be a-f )
ADDLW 0x3A ; then finally add 58 to get 'proper' ascii
; 1) w = low(nibble+246+58) = 48+nibble ( if 0-9 )
; 2) w = low(nibble+246+7+58) = 55+nibble ( if a-f )
; nibble converted to ASCII hex in w
RETURN |
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