Atmel CAVR-4 Manual De Usuario

CAVR-4

Descriptions of language extensions

Reference Guide

See the chapter Extended keywords for a complete list of attributes.

The operator 

@

 or the directive #

pragma

 

location

 can be used for placing a variable 

at an absolute address, or placing a variable or function in a named segment. The named 
segment can either be a predefined segment, or a user-defined segment.

_ _no_init int x @ 0x1000;

An absolute declared variable cannot have an initializer, which means the variable must 
also be 

_ _no_init

 or 

const

 declared.

void test(void) @ "MYOWNSEGMENT"

{

  ...

Note that all segments, both user-defined and predefined, must be assigned a location, 
which is done in the linker command file.

For information about the preprocessor operator 

_Pragma

, see _Pragma(), page 233.

Variadic macros are the preprocessor macro equivalents of 

printf

 style functions. For 

more information, see __VA_ARGS__, page 235.

The 

inline

 keyword can be used on functions. It works just like the C++ keyword 

inline

 and the 

#pragma inline

 directive.

It is possible to mix declarations and statements within the same scope.

It is possible to have a declaration in the initialization expression of a 

for

 loop.