macro setup

[ibwev]

First time to attempt using a macro. So far I've been unsuccessful. I'm using MPLAB with MPASM assembler. The code compiles; however the MPLAB simulator produces the following error message when the simulator reaches the instruction line calling the MACRO:

CORE-W0014: Halted due to PC incrementing over the Maximum PC address and wrapping back to Zero

Please help.

 

[ericgibbs]

hi,
There are many errors in the program listing.
Why are you using a mixture or relative/absolute statements, are you trying for relocatable code or a hex file for a PIC.????

 

[ibwev]

hi,
There are many errors in the program listing.
Why are you using a mixture or relative/absolute statements, are you trying for relocatable code or a hex file for a PIC.????

I am trying for a hex file for the PIC16F690.

I do not know how to answer why I am using a mixture of relative/absolute statements. I am working through a tutorial on gooligum and the lesson I am on is trying to teach me how to insert a macro into the body of the main program.

 

[ericgibbs]

I am trying for a hex file for the PIC16F690.

I do not know how to answer why I am using a mixture of relative/absolute statements. I am working through a tutorial on gooligum and the lesson I am on is trying to teach me how to insert a macro into the body of the main program.

hi,
Look at this very simple use of a Macro.

;
;dummy program

    list      p=16F690            ; list directive to define processor
    #include <p16F690.inc>        ; processor specific variable definitions
    errorlevel -302, -207    
    
;define registers
WAITL   equ 0x20
CNTR0    equ 0x21
CNTR1     equ 0x22

    
;Define the macro          
;delay loop 1 to 255 msec  
LOOPMS    macro    MSEC   
    movlw    MSEC 
    movwf    WAITL  
    call    LOOP_WAIT
    endm

    org 0x0000
    goto start
    org 0x0004


start:
    LOOPMS    .1 ; this loads the macro with 1mSec count

    nop
    goto start

;usage called from macro loopms .nnn 
LOOP_WAIT:
    call    DEL1MS
    decfsz    WAITL,F        
    goto    LOOP_WAIT
    return

DEL1MS:                ; 1ms delay loop 
    movlw    0X64        ;100*10US=1MS
    movwf    CNTR0
DL2:
    nop
    nop
    nop
    nop
    nop
    nop
    nop
    decfsz    CNTR0, F
    goto    DL2        ;
    return

    end

 

[ericgibbs]

hi ibwev.

I would suggest that you look at Nigels tutorials, the link is near my signature on this post.

 

[ibwev]

I got it working thanks to your help.

 

[ericgibbs]

I got it working thanks to your help.

hi,
Thats good.
You will find that Nigels tutorials, with the hardware circuits provided are a quick and easy way to get into assembler programming.