>Is there a way i can define names for porta,0 and porta,1 so that in the
>code i can use the names, instead of the pin names? Then if i move something
>around, all i need to do is change the name -> pin assignment and recompile,
>instead of searching all the code for porta,0 etc.

Sure!  Use the #define function in MPLAB.  The following is snipped from
working code.  Note that I define all bit variables with a leading
underscore - this is *MY* convention and not required by MPLAB.

To change the pin assignment for any i/o line, all I have to do is change
the #define in ONE location.

; PORT A Device Bits    note: ra 0,1 a/d inputs so no labels for them
    #define _MUXCLK  RA,2        ; RA2, a/d ext mux clk out (active LO)
    #define _MUXRST  RA,3        ; RA3, a/d ext mux reset out (active HI)
    #define _PBWR    RA,4        ; RA4, "WRITE" button (active LO)
    #define _PBRD    RA,5        ; RA5, "READ" button (active LO)

RA_INIT         EQU b'00010000' ;
DDR_A           EQU b'00110011' ; ddr: ra 2,3==out,  ra 0,1,4,5==in
DIPWRMSK        EQU b'00010000' ;
DIPRDMSK        EQU b'00100000' ;

; PORT B Device Bits
    #define _IPCRXD RB,0        ; RB0, IPC data input (active LO)
    #define _IPCTXD RB,1        ; RB1, IPC data out (active HI)
    #define _DHTRLD RB,2        ; RB2, display heater LEDs data output
    #define _DSTAT  RB,3        ; RB3, display status & inputs (bi-dir)
    #define _STROBE RB,4        ; RB4, ctrl, DipSw, disp str, eeprom !CS
    #define _SERCLK RB,5        ; RB5, ctrl, DipSw, display CLOCK
    #define _EECLK  RB,6        ; RB6, eeprom clock
    #define _SERDAT RB,7        ; RB7, ctrl, DipSw, eeprom DATA (bi-dir)

RB_INIT         EQU b'00000001' ;initial port B data status
DDR_B           EQU b'10001001' ;ddr: rb 1,2,4,5,6==out,  rb 0,3,7==in
DDR_BLO         EQU b'10001001' ;AND  0s force bits LO
DDR_BHI         EQU b'00000001' ;OR  1s force bits HI

Hope this helps.

dwayne



Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

Celebrating 15 years of Engineering Innovation (1984 - 1999)

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