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APEXP (Application Symbol Export)

The APEXP directive is used to export symbols that interface with the Neuron C

application.

An exported symbol must be defined as a label within the assembly file from

which it is exported. Exporting the symbol makes it available to the linker. The

linker uses exported symbols to resolve references from other object modules. It

is possible, and sometimes required, to export and import a symbol within the

same assembly file to permit the linker to resolve expressions between separate

segments.

See also EXPORT (Export Symbol).

Syntax:

The APEXP directive requires either a label or an argument, or both.

label APEXP

APEXP symbol

APEXP symbol, symbol, ...

label APEXP symbol

label APEXP symbol, symbol, ...

An argument can be a symbol, or it can be a list of symbols separated by commas.

The argument specifies the symbols to be exported. If there is no argument for

the directive, it must have a label, and the label becomes the exported symbol. If

there are both an argument and a label, the argument specifies the symbols to be

exported and the label is a standard label.

Examples:

The following example exports the label %IOToggle as an external symbol to the

Neuron C application:

%IOToggle APEXP

The following example exports the symbols Flag1 and Flag2 to the Neuron C

application:

InFlags APEXP Flag1, Flag2

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Echelon Neuron Manual de usuario Pagina 144