Declaring word-variables in bank15 on a pic18f2431 ?


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  1. #1
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    Question Declaring word-variables in bank15 on a pic18f2431 ?

    Hello,
    I want to use the 16-bit-values inside CAP1BUFL & CAP1BUFH in PBP.

    I wrote:

    CAP1BUF Var word $F68

    the resulting error says, the declaration is "out of bounds".
    So I changed the file 18f2431.bas and inserted:

    bank15 $0F60, $0FFF

    and I know, it's dangerous !

    How can it be made the right way ???
    PBP 2.50C, MCS+ 3.0.0.5, MPLAB 8, MPASM 5.14, ASIX Presto, PoScope, mE mikroBasic V7.2, PICKIT2

  2. #2
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    Hi BigWumpus,

    Did you try it without declaring a specific bank location?

    As much as I can remember, a word variable can not fit into BANK15 .

    Just a small glint I had in my mind


    -----------------------------

    Edit: Also,

    <img src="http://img4.picsplace.to/img4/26/err_001.JPG" alt="Image Hosting by PicsPlace.to" >


    ----------------------------
    Last edited by sayzer; - 25th October 2006 at 12:32.
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte

  3. #3
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    You don't need to do anything special with PBP to access special function
    registers. Just use the register name like you would with any other part.

    You have several options;
    Code:
        CAPBUF VAR WORD
        CAPBUF = 0
        
        @CAP1Buffer = CAP1BUFL
        CAP1Buffer VAR WORD EXT
        
        CAP1BUFL = 10
        CAP1BUFH = 88
    
    Main:
    
    WithPBP:
        CAPBUF.LowByte = CAP1BUFL    ' low byte
        CAPBUF.HighByte = CAP1BUFH   ' high byte
        GOTO Main
        
    TheDarrelWay:
        CAPBUF = CAP1Buffer
        GOTO Main
        
    ' Or in asembler.
    
    TheMovffWay: 
        @ MOVFF CAP1BUFL, _CAPBUF   ; low byte
        @ MOVFF CAP1BUFH, _CAPBUF+1 ; high byte
        GOTO Main
    
    TheLongWay: ' banked method
        @ MOVLB 0x0F            ; point to bank 15
        @ MOVF CAP1BUFL,W       ; low byte
        @ MOVWF _CAPBUF,ACCESS
        @ MOVF CAP1BUFH,W       ; high byte
        @ MOVWF _CAPBUF+1,ACCESS
        GOTO Main
    Regards,

    -Bruce
    tech at rentron.com
    http://www.rentron.com

  4. #4
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    Thumbs up

    I take Darrels way !!!! This is what I'm looking for !
    PBP 2.50C, MCS+ 3.0.0.5, MPLAB 8, MPASM 5.14, ASIX Presto, PoScope, mE mikroBasic V7.2, PICKIT2

  5. #5
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    WooHoo!

    Don't know if you're using more than 1 of them, but if you want to access all 3 as an array, you can also do something like this...
    Code:
    @CAP = CAP3BUFL
    CAP    VAR WORD EXT
    CAPBUF VAR WORD
    Index  VAR BYTE 
    
    FOR Index = 1 to 3
        CAPBUF = CAP(3-Index)
        HSEROUT ["CAP",DEC1 Index,"= ",DEC CAPBUF,13,10] 
    NEXT Index
    It would have been easier if they hadn't put them in reverse order in RAM.
    DT

  6. #6
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    Quote Originally Posted by BigWumpus
    I take Darrels way !!!! This is what I'm looking for !
    I hear ya..! Mr. Wizard, err, Darrel, comes up with some pretty handy
    stuff..
    Regards,

    -Bruce
    tech at rentron.com
    http://www.rentron.com

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