Gameboy Development Forum

Hi,

I'm not sure but I think, as once compiled the constants have been replaced by their value, it depends on your compiler syntax.
For example, with WLA-DX, you can use : ".DEFINE name value" as indicated here : http://ftp.sunet.se/pub/aminet/dev/cross/wla-dx.readme

***********************************************************
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.DEFINE IF $FF0F
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Assigns a number or a string to a definition label.

By default all defines are local to the file where they are
presented. If you want to make the definition visible to all the
files in the project, use .EXPORT.

Here are some examples:

.DEFINE X 1000
.DEFINE FILE "level01.bin"
.DEFINE TXT1 "hello and welcome", 1, "to a new world...", 0
.DEFINE BYTES 1, 2, 3, 4, 5
.DEFINE COMPUTATION X+1

All definitions with multiple values are marked as data strings,
and .DB is about the only place where you can later on use them.

.DEFINE BYTES 1, 2, 3, 4, 5
.DB 0, BYTES, 6

is the same as

.DB 0, 1, 2, 3, 4, 5, 6

Note that you must do your definition before you use it, otherwise
WLA will use the final value of the definition. Here's an example
of this:

.DEFINE AAA 10
.DB AAA            ; will be 10.
.REDEFINE AAA 11

but

.DB AAA            ; will be 11.
.DEFINE AAA 10
.REDEFINE AAA 11

You can also create definitions on the command line. Here's an
example of this:

wla-gb -vl -DMOON -DNAME=john -DPRICE=100 -DADDRESS=$100 math.s

MOON's value will be 0, NAME is a string definition with value "john",
PRICE's value will be 100, and ADDRESS's value will be $100.

Note that

.DEFINE AAA = 10   ; the same as ".DEFINE AAA 10".

works as well.

This is not a compulsory directive.

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Even if you're not using WLA-GX, i think you can try this : compiler syntax are quite similar.

I hope it will help you.

Last edited by Ben (2015-01-21 16:35:19)

WLA lets you do three syntactically correct forms of define:

.define pizza 7
.def pizza 7
.equ pizza 7