Hi,

I need a case statement in my application and because it is
so repetetive am looking to implement it as a macro.

The basic blocks of the case look like:

  movlw  CmdA
  xorwf  RX_Cmd, w
  skpnz
  goto   doCmdA

  movlw  CmdB
  xorwf  RX_Cmd, w
  skpnz
  goto   doCmdB

  ...

CmdA and CmdB are constant values defined elsewhere. RX_Cmd is a
command which this PIC needs to execute received from another
processor. There may be a couple of dozen commands randomly
scattered across the 256 bit combinations (I have no control
over that) so a jump table is not an option.

I would like to code each section into a macro a bit like this:

_case macro cmd
  movlw  cmd
  xorwf  RX_Cmd, w
  skpnz
  goto   ***  this is where I get stuck
  endm

What I would like to do here is put a line like:

  goto  "do"+cmd

but this doesn't work.

Are there any string manipulation operators in the MPASM macro language
that I can use?

Regards,


Mike Watson