AN3350 datasheet(69/185 Pages) STMICROELECTRONICS

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AN3350

Working with the assembler

Doc ID 018512 Rev 2

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next\@:

#endm

The mechanism implementing this behavior replaces these labels with new ones that use an

integer counter beginning with zero and incremented on each call.

Default values for macros

Both types of macros accept default values for their parameters. Default values can be set to

the last parameters by using the equal character (=). The value assigned is the following

sequence of tokens ending at the first comma met. For the last parameter, default value

ends at the closing right parenthesis (in single-line macros) or at the end of the line (in multi-

line macros), as shown in Example 7.

Example 7 Appropriate macro ending

#macro ADD R, A = 2, B = 3

movei R, A + B

#endm

ADD a, 34

ADD a,78,98

ADD a

The macro in Example 7 expands to the code in Example 8.

Example 8 Macro expansion

movei a, 34 + 3

movei a, 78 + 98

movei a, 2 + 3

Note:

The actual number of arguments passed in a call can be obtained using %0.

10.6

Macro-related directives

See Table 8 for macro-related directives.

Table 8.

Macro-related directives

Directive

Explanation

#assign

Allows you to quickly delete and redefine the value of a single-line

macro with no parameters.

#define

Defines a single-line macro as explained in Section 10.5.2: Regular

(single-line) macros. Single-line macros can be declared inside

multi-line macros.

#endm

Ends a macro definition.

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