On Mon, 31 Mar 2003, Olin Lathrop wrote:

> >> SKIP_Z is one of my macros that just expands to BTFSS STATUS, Z on the
> >> 16
> >> family.
> >>
> >>
> > Not wishing to be rude, but MPASM already has skpz and skpnz macro's.
> > Why
> > not use the macro's that come with the tool? (i.e. the ones that other
> > people will already be using).
>
> I wrote mine before MPASM had these, or at least before I heard about
> them.  I know people have mentioned them here, but I still can't find any
> reference to them in the latest "MPASM User's Guide with MPLINK and MPLIB"
> (DS33014G).  I feel uncomfortable using features that are not documented.
> In any case, I've got way too much existing code to change now.

When comparing hex files for MPASM and gpasm I was surprised to discover
that the SKPXX macros were not supported for 18F family in the versions of
MPASM distributed with pre 6.0 MPLAB. In the pass, I've seen the macros
defined in two places: the "MPASM and MPLINK PICmicro Quick Reference
Guide" (DS30400E) and in the MPASM help under MPLAB. In the reference
guide, the macros are described in the section titled "12-bit/14-bit Core
Special Instruction Mnemonics". Conspicuously absent is '16-bit'. AFAICT,
the macros are intentionally not defined for the 16-bit cores. I doubt
this fact is mentioned in the 14-bit to 16-bit transition guide.

When it's important for me to have source that can be assembled by gpasm
and MPASM, I added this to my Makefile:

# gpasm programs
ASM             = gpasm --define GPASM=1


Later on I have this:

$(PROJECT).cod: $(SOURCES)
        $(ASM) $(PROJECT).asm

In the source, I have this:

  ifndef  GPASM
        MESSG "defining standard macros for MPASM"
  include "mpasm.inc"

  endif

The mpasm.inc file looks like this:

==================================================================
;sigh... What was microchip thinking. Mpasm for the 18f parts no
;longer includes the common macros:

CLRC macro
        BCF     STATUS,C
  endm

SKPNC   macro
        BTFSC   STATUS,C
  endm

SKPC    macro
        BTFSS   STATUS,C
  endm

SETZ    macro
        BSF     STATUS,Z
  endm

CLRZ    macro
        BCF     STATUS,Z
  endm

SKPZ    macro
        BTFSS   STATUS,Z
  endm

SKPNZ   macro
        BTFSC   STATUS,Z
  endm

SKPDC   macro
        BTFSS   STATUS,DC
  endm

SKPNDC  macro
        BTFSC   STATUS,DC
  endm

==================================================================



Scott

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