1 reply to this topic

[Thomas Jentzsch]

Any idea how to pass variables instead of constant numbers to a macro?

E.g. instead of "MACRO 1" I would like to do "MACRO variable". But when I do this outside an expression, inside the macro {1} is converted into the string "variable" and not the content of the variable.

  MAC TEST
Label{1}
    .byte {1}
  ENDM  

variable SET 10
  TEST variable

This works for the .byte instruction, but not for the label. I get "Labelvariable" instead of "Label10".

Any ideas?

[SeaGtGruff]

Thomas Jentzsch, on Mon Mar 7, 2011 6:13 AM, said:

Any idea how to pass variables instead of constant numbers to a macro?

E.g. instead of "MACRO 1" I would like to do "MACRO variable". But when I do this outside an expression, inside the macro {1} is converted into the string "variable" and not the content of the variable.

  MAC TEST
Label{1}
    .byte {1}
  ENDM  

variable SET 10
  TEST variable

This works for the .byte instruction, but not for the label. I get "Labelvariable" instead of "Label10".

Any ideas?

I have an idea, but you might not like it-- although it's the only thing I could get to work.

Define a macro called LABEL, as follows:

   MAC LABEL
   if <{1} == 0
Label0
   endif
   if <{1} == 1
Label1
   endif
   if <{1} == 2
Label2
   endif
; etc.
   if <{1} == 10
Label10
   endif
; etc., up to
   if <{1} == 255
Label255
   endif
   ENDM

This assumes that the variable you're going to pass to your macro will be set to a value between 0 and 255.

Then you can call the LABEL macro from inside your other macro, as follows:

   MAC TEST
   LABEL {1}
   BYTE {1}
   ENDM

Then this works:

variable SET 10
   TEST variable

The output is as follows:

Label10
   BYTE variable ; which gives you a byte of $0A

The only reason I suggest defining a macro called LABEL is in case you want to call it from inside multiple macros.
Michael