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PIC Microcontoller Radix Math Method

ASCII hexadecimal to Binary

by: Peter F.

After looking at the conversion routines above, I figured I'd add my own. Note this routine does no error checking on the ascii input characters. Peter F. tsetsetse at hotmail.com

;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 

Comments:

See also:


file: /Techref/microchip/math/radix/a2b-2h8b-pf.htm, 1KB, , updated: 2009/4/20 10:11, local time: 2017/11/22 19:58,
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