In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

OK Guys, I must be dense or something, because I just can't get it to work no matter what I do. Using the pasting operator, ....setting labels in the first column or second column.... evaluatins variables, assigning values.... just nothing .

In its simplest form, all I'm trying to do is:  If an instruction statement starting with a particular label has not yet been entered into my source code (that is a proper use of "IFNDEF" of the lable as I understand it), then create the line, otherwise do nothing and exit the macro.

Like:

Assign      macro    Name                ;create a macro
               ifdef  I??Name                 ;test for the modified parameter passed already exists
                    exitm                         ;if so then bail out
               else                                ;otherwise
I??Name       jmp  OtherName         ;create this label from the parameter passed
               endm                              ;done

And when I invoke the macro once, this works OK. It's when I invoke it subsequent times that I get a "redefine symbol" message. What I need the macro to realize it has already issued the statement in the first instance, and from that point on it should not attempt to issu it again. This way I could create a very nice jump table sort of automatically.

I just can't get it to be happy after the first invocation...... help??

Cheers,

Peter (pjv)

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