PIC Microcontoller Radix Math Method

ASCII hexadecimal to Binary

@spam@paulswork at @spam@hotmail.com

here are a couple of BIN to ASCII converters I wrote, might be useful.

;**********************************************************************
; Routine:ASCIItoBIN
; Input Registers:ASCII_MSW, ASCII_LSW
; Output Registers: BUFFER
; Internal Registers:None
; CALLS:None
; Function: Receives two ASCII bytes in ASCII_MSW and ASCII_LSW registers.
; These two bytes are converted into 1 byte binary, returned from this 
; routine in register BUFFER
;**********************************************************************
ASCIItoBIN	MOVLW 	65		;convert ascii into MSW address 
		SUBWF 	ASCII_MSW,W
		MOVLW 	48
		BTFSC 	StatusREG,C
		MOVLW 	55
		SUBWF 	ASCII_MSW,W
		ANDLW 	b'00001111'
		MOVWF 	BUFFER		;Save result of the upper nibble
		SWAPF 	BUFFER,1
		MOVLW 	65		;convert ascii into LSW address 
		SUBWF 	ASCII_LSW,W
		MOVLW 	48
		BTFSC 	StatusREG,C
		MOVLW 	55
		SUBWF 	ASCII_LSW,W
		ANDLW 	b'00001111'	;Get result of lower nibble
		IORWF 	BUFFER,1	;and put final result in BUFFER for output
		retlw 0

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