Hello,

I am hoping that someone besides me has experienced the same problem
with the MPSIM for pic devices, relating to a macro and the testing of
the status register just after the macro.

I problem is this, I am trying to run through simulations of my 18Fxxx
code using MPSIM.  I have many macros which do basic 24bit addition and
subtraction.  The problem is that, just after the macro routine, I
usually test for a carry out or borrow.  However, MPSIM sets the status
registers just after the macro but before the BTFSS command.  For
example.

;Let ACCELMOTION_L be the first byte of the 24 bit value and _H and _U
are ACCELMOTION_L + 1 and + 2.
;  The value is 03CD
;Let ACCELRATE_L be the first byte of the rate to decelerate by of a
24-bit value as similar to above.
;  The value is 04FE,
;The result of this 0X03CD - 0X04FE = FECF and the status would show the
C bit being low for a borrow.

MSUB24           ACCELMOTION_L, ACCELRATE_L, BANKED     ; A 24 bit
subtraction routine.
;Inside the macro all is ok.  The status register shows correct C bit
value of low.  But when MPSIM goes to the first line
;outside of the macro as follows
BTFSS              STATUS,C,A                 ;The status now shows the
C bit as being high.  Which is wrong. And causes my code testing to
fail.
BRA                 DeccComplete.


Now MSUB24 is defined as follows:
MSUB24           MACRO ArgA,ArgB,bank
            ;ArgA - ArgB -> ArgA
            MOVF   ArgB,W,bank
            SUBWF            ArgA,F,bank
            MOVF   ArgB+1,W,bank
            SUBWFB          ArgA+1,F,bank
            MOVF   ArgB+2,W,bank
            SUBWFB          ArgA+2,F,bank
            ENDM


As can be seen, it takes 3 arguments A_arg, B_arg and the banking/access
bit modifier.
Does anyone have a solution to this, or is it just a big fat but in
MPSIM.  I have had the same results using MPLAB 5 and MPLAB 6.
But, if I replace the macro call with the actual code, everthing is ok.
Also, how do you report bugs to Microchip?  I have found many such bugs
that have never been fixed.

Regards,

James.

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