Texas Instruments MSP-FET430 manual File Reference Directives, Conditional-Assembly Directives

TI to IAR 2.x/3.x Assembler Migration

E.2.6	File Reference Directives
Description		Asm430 Directive (TI)	A430 Directive (IAR)
Include source statements from another		.copy or .include	#include or $
file
Identify one or more symbols that are		.def	PUBLIC or EXPORT
defined in the current module and used in
other modules
Identify one or more global (external)		.global	1)
symbols
Define a macro library		.mlib	2)
Identify one or more symbols that are		.ref	EXTERN or IMPORT
used in the current module but defined in
another module

1)The directive .global functions as either .def if the symbol is defined in the current module, or .ref otherwise. PUBLIC or EXTERN must be used as applicable with the A430 assembler to replace the

.global directive.

2)The concept of macro libraries is not supported. Include files with macro definitions must be used for this functionality.

Modules may be used with the Asm430 assembler to create individually linkable routines. A file may contain multiple modules or routines. All symbols except those created by DEFINE, #define (IAR preprocessor directive) or MACRO are “undefined” at module end. Library modules are, furthermore, linked conditionally. This means that a library module is only included in the linked executable if a public symbol in the module is referenced externally. The following directives are used to mark the beginning and end of modules in the A430 assembler.

Additional A430 Directives (IAR)			A430 Directive (IAR)
Start a program module			NAME or PROGRAM
Start a library module			MODULE or LIBRARY
Terminate the current program or library module			ENDMOD
E.2.7	Conditional-Assembly Directives
Description		Asm430 Directive (TI)	A430 Directive (IAR)
Optional repeatable block assembly		.break	1)
Begin conditional assembly		.if	IF
Optional conditional assembly		.else	ELSE
Optional conditional assembly		.elseif	ELSEIF
End conditional assembly		.endif	ENDIF
End repeatable block assembly		.endloop	ENDR
Begin repeatable block assembly		.loop	REPT

1)There is no directive that directly corresponds to .break. However, the EXITM directive can be used with other conditionals if repeatable block assembly is used in a macro, as shown:

SEQ	MACRO FROM,TO		; Initialize a sequence of byte constants
	LOCAL X
X	SET	FROM
	REPT	TO-FROM+1	; Repeat from FROM to TO
	IF	X>255	; Break if X exceeds 255
	EXITM
	ENDIF
	DB	X	; Initialize bytes to FROM...TO

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