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PIC Microcontoller Math Library Methods

Conversion of Millimeters to Inches

To convert Millimeters to Inches, Divide by 25.4 or multiply by .03937.

See http://www.piclist.com/cgi-bin/constdivmul.exe

For an eight bit value...

; ACC = ACC * 0.03937
; Temp = TEMP
; ACC size = 8 bits
; Error = 0.5 %
; Bytes order = little endian
; Round = no

; ALGORITHM:
; Clear accumulator
; Add input / 32 to accumulator
; Add input / 128 to accumulator
; Add input / 4096 to accumulator
; Move accumulator to result
;
; Approximated constant: 0.0393066, Error: 0.160933 %

;     Input: ACC0, 8 bits
;    Output: ACC0, 4 bits
; Code size: 20 instructions

	cblock
	ACC0
	TEMP0
	endc

;copy accumulator to temporary
	movf	ACC0, w
	movwf	TEMP0


;shift accumulator right 5 times
	swapf	ACC0, w
	andlw	0x0F
	movwf	ACC0
	clrc
	rrf	ACC0, f

;add temporary to accumulator
	movf	TEMP0, w
	addwf	ACC0, f

;shift accumulator right 2 times
	rrf	ACC0, f
	clrc
	rrf	ACC0, f

;add temporary to accumulator
	addwf	ACC0, f

;shift accumulator right 5 times
	swapf	ACC0, w
	andlw	0x0F
	movwf	ACC0
	skpnc
	bsf	ACC0, 4
	clrc
	rrf	ACC0, f


; Generated by www.piclist.com/cgi-bin/constdivmul.exe (November 17, 2000 version)
; Tue Apr 03 14:37:32 2001 GMT

See also:


file: /Techref/microchip/math/convmilinch.htm, 1KB, , updated: 2001/4/3 09:39, local time: 2017/10/17 15:29,
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<A HREF="http://www.piclist.com/techref/microchip/math/convmilinch.htm"> PIC Microcontoller Math Library Methods for Conversion of Millimeters to Inches</A>

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