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Within these pages, you can find many useful pieces of code mostly in assembly for the Microchip PIC micro controller family. A lot of people have spend many hours trying to put the bits and bytes together. If the code is NOT written by a member of the PCB Heaven community, then a link will be added above the code with the original website that this code was found.
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View code
Binary to BCD
unpacked, 24 bit to 4 digits
Author: Oliver Broad
This code was originally located @ http://www.piclist.com
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; Code is based on the fact that a bcd number may be multiplied
; by two by a simple bit shift followed by a BCD fixup. The
; fixup is greatly simplified by performing it BEFORE the shift,
; which is why 3 and 30H are used instead of 6 and 60H.
LIST P=16C73
INCLUDE P16C73.INC
CBLOCK 20H
R3,R2,R1,R0 ;MUST START ON BINARY XXXXX000.
COUNT, LBYTE, MBYTE, HBYTE
ENDC
ORG 0
MAIN MOVFW PORTB
MOVWF LBYTE
MOVFW PORTB
MOVWF MBYTE
MOVFW PORTB
MOVWF HBYTE
CALL BIN2BCD
GOTO MAIN
BIN2BCD MOVLW 18H
MOVWF COUNT
CLRF R0
CLRF R1
CLRF R2
CLRF R3
BCF STATUS,C
GOTO BIN2BC2
BIN2L MOVLW R3
MOVWF FSR
BCDADJ MOVLW 03H
ADDWF INDF,F
BTFSS INDF,3
SUBWF INDF,F
MOVLW 30H
ADDWF INDF,F
BTFSS INDF,7
SUBWF INDF,F
INCF FSR,F
BTFSS FSR,2
GOTO BCDADJ
BIN2BC2 RLF LBYTE,F
RLF MBYTE,F
RLF HBYTE,F
RLF R3,F
RLF R2,F
RLF R1,F
RLF R0,F
DECFSZ COUNT,F
GOTO BIN2L
RETLW 0
END |
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