;=============================================================================
;
;   File convert.asm
;
;   Converts register values to string
;
;   Copyright (c) 2011, Matthias Heinrichs, HeinrichsWeikamp, all right reserved.
;=============================================================================
; HISTORY
;   2007-10-07 : [MH]  Creation for OSTC sources
;   2010-12-10 : [jDG] Optimize macro size
;

#include    "hwos.inc"                  ; Mandatory header

;=============================================================================

        CBLOCK  tmp+0x08                ; space for aa_wordprocessor
        	temp3
        	temp4
        	cvt_flags2
            ; Reserved to tmp+0x10...
        ENDC

#define pre_zero_flag   cvt_flags2,0
#define all_zeros_flag  cvt_flags2,1
#define DP_done         cvt_flags2,2
#define DP_done2        cvt_flags2,3
#define show_last3      cvt_flags2,4
#define leading_zeros   cvt_flags2,5

basic   CODE

;=============================================================================
    global  output99_call
output99_call:
	clrf	ignore_digits
	incf	ignore_digits,F
	clrf	temp4

    global  output99
output99:
	movlw	d'99'
	cpfslt	lo
	movwf	lo							; Limit to 99
	movff	lo,lo_temp		
	clrf	hi_temp
	bcf		pre_zero_flag	; do not display leading zeros

LCD_val99_2:	
	movlw	b'00001010'	; 10
	movwf	temp2		
	clrf	temp3		
	rcall	DEC2ASCII

	movlw	b'00000001'	; 1
	movwf	temp2		
	clrf	temp3		
	bsf		pre_zero_flag ; last figure, display zero (0)
	rcall	DEC2ASCII
	RETURN

	global	output99x_call

output99x_call:
	clrf	ignore_digits
	incf	ignore_digits,F
	clrf	temp4

	movlw	d'99'
	cpfslt	lo
	movwf	lo							; Limit to 99
	movff	lo, lo_temp		
	clrf	hi_temp
	bsf		pre_zero_flag		; display leading zeros
	bra		LCD_val99_2			
	
	global	output8_call

output8_call:	
    clrf	ignore_digits
	incf	ignore_digits,F
	clrf	temp4

output8:
	movff	lo, lo_temp		
	clrf	hi_temp
	bcf		pre_zero_flag	; do not display leading zeros
	
	movlw	b'01100100'	; 100
	movwf	temp2		
	clrf	temp3		
	rcall	DEC2ASCII
	bra		LCD_val99_2			

	global	output16_3_call
	global	output16_call
	global	output16
output16_3_call:                ; limit to 999
	bsf		show_last3
    ; Limit to 3
    movlw   .4
    cpfslt  hi
    bra     output16_3_call_2
    movlw   .3
    cpfseq  hi          ; =3?
    bra     output16_3_call_3   ; No, done.
    movlw   .231                ; Limit to 231(+768=999...)
    cpfslt  lo
    movwf   lo
    bra     output16_3_call_3   ; done.
output16_3_call_2:  ; Set to .999
    movlw   LOW     .999
    movwf   lo
    movlw   HIGH    .999
    movwf   hi
output16_3_call_3:
output16_call:
	clrf	ignore_digits
	incf	ignore_digits,F
	clrf	WREG
output16:
	movwf	temp4           ; Passed from output16dp macro, cleared by others.

	bcf		all_zeros_flag	; do not display any zero from here unless there was at least one figure /zero

	bsf		leading_zeros
	tstfsz	temp4			; Display leading zeros at all?
	bcf		leading_zeros

	bsf		DP_done2		
	tstfsz	temp4
	bcf		DP_done2		; decimal point not yet set
	
	movff	lo, lo_temp		
	movff	hi, hi_temp		
	bcf		pre_zero_flag	; do not display leading zeros
	
	movlw	b'00010000'	; 10000s
	movwf	temp2		 
	movlw	b'00100111'
	movwf	temp3		 
	btfss	show_last3		; display only last three figures?
	rcall	DEC2ASCII		; No, show all. Here: 5th order digit
	
	movlw	b'11101000'	; 1000s
	movwf	temp2		 
	movlw	b'00000011'
	movwf	temp3		 
	btfsc	DP_done2			; Is there a decimal point at all?
	bra		output16_2			; no, use normal display mode

	btfsc	all_zeros_flag		; display any zero from here
	bra		output16_1			; there was a figure /zero already

	bsf		pre_zero_flag		; display figure if zero?
	decfsz	temp4,W		
	bcf		pre_zero_flag		; No

output16_1:
	btfsc	DP_done				; Decimal point set already?
	bsf		pre_zero_flag		; Yes, so display the rest
output16_2:
	btfss	show_last3			; display only last three figures?
	rcall	DEC2ASCII			; No, show all. Here: 4th order digit
	bcf		show_last3			; Yes, so display the rest

	movlw	b'01100100'	; 100s
	movwf	temp2		 
	clrf	temp3		

	btfsc	ignore_digit3		; Ignore 3rd-5th digit?
	bra		output16_5			; Yes, skip the rest

	btfsc	DP_done2			; Is there a decimal point at all?
	bra		output16_3			; no, use normal display mode

	btfsc	all_zeros_flag		; display any zero from here
	bra		output16_2_1		; there was a figure /zero already

	bsf		pre_zero_flag		; display figure if zero?
	decfsz	temp4,W		
	bcf		pre_zero_flag		; No

output16_2_1:
	btfsc	DP_done				; Decimal point set already?
	bsf		pre_zero_flag		; Yes, so display the rest
	btfsc	DP_done2			; Is there a decimal point at all?
	bsf		pre_zero_flag		; No, so display the rest
output16_3:
	rcall	DEC2ASCII			;3th order digit...

	movlw	b'00001010'	; 10s
	movwf	temp2		
	clrf	temp3		
	btfsc	DP_done2	
	bra		output16_4	

	btfsc	all_zeros_flag		; display any zero from here
	bra		output16_3_1		; there was a figure /zero already

	bsf		pre_zero_flag
	decfsz	temp4,W		
	bcf		pre_zero_flag

output16_3_1:
	btfsc	DP_done		
	bsf		pre_zero_flag
	btfsc	DP_done2	
	bsf		pre_zero_flag		
output16_4:
	btfsc	ignore_digit4		; Ignore 4-5th digit?
	bra		output16_5			; Yes, skip the rest
	rcall	DEC2ASCII			; 2nd order digit

	movlw	b'00000001'	; 1s
	movwf	temp2		
	clrf	temp3		 
	bsf		pre_zero_flag
	btfss	ignore_digit5		; Ignore 5th digit?
	rcall	DEC2ASCII			; 1st order digit
	bcf		ignore_digit5		; yes, and clear flag
output16_5:
    bcf     ignore_digit4		; Clear flag
	bcf		ignore_digit3		; Clear flag
	clrf	ignore_digits
	incf	ignore_digits,F
	bcf		DP_done
	RETURN						; Done with convert.asm...
	
DEC2ASCII	clrf	temp1		; converts into ASCII code
DEC2ASCII_2	movf	temp3,W
	subwf	hi_temp,W
	btfss	STATUS,C	
	bra		DEC2ASCII_4	
	bnz		DEC2ASCII_3		

	movf	temp2,W	
	subwf	lo_temp,W
	btfss	STATUS,C
	bra		DEC2ASCII_4
	
DEC2ASCII_3	movf	temp3,W
	subwf	hi_temp,F
	movf	temp2,W
	subwf	lo_temp,F
	btfss	STATUS,C
	decf	hi_temp,F
	incf	temp1,F	
	bsf		pre_zero_flag
	bra		DEC2ASCII_2

DEC2ASCII_4
	decfsz	ignore_digits,F
	return
	incf	ignore_digits,F	; so ignore_digits stays zero for the test above
	movlw	'0'				; Offset for Ascii-value
	addwf	temp1,W
	btfsc	pre_zero_flag	; is this a leading zero?
	bra		DEC2ASCII_4_1	; no
	btfsc	leftbind
	bra		DEC2ASCII_6
	movlw	' '				; instead of leading zeros a space!
	bra		DEC2ASCII_5
DEC2ASCII_4_1:
	bsf		all_zeros_flag	; display any zero from here
DEC2ASCII_5
	movwf	POSTINC2
DEC2ASCII_6	
	decfsz	temp4,F			; Set decimal point?
	RETURN					; No
	movlw	"."				; Yes
	movwf	POSTINC2
	bsf		DP_done
	RETURN
	
	END