PIC Microcontoller Radix Math Method - ASCII hexadecimal to Binary

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:

file: /Techref/microchip/math/radix/a2b-2h8b-pf.htm, 1KB, , updated: 2009/4/20 10:11, local time: 2024/12/25 20:51,

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