Macro definitions are not variables and cannot be changed by your. The preprocessor is a part of the compiler which performs preliminary operations (conditionally compiling code. These macro definitions allow constant values to be declared for use throughout your code. I usually pass macro definitions from make command line to a makefile. C++ compilers use the same C preprocessor. Macro replacement lists should be parenthesized. White space cannot separate the identifier (which is the name of the macro) and the left parenthesis of the parameter list. The parameters are imbedded in the replacement code. Prefer inline or static functions to function-like macros and PRE02-C. Function-like macro definition: An identifier followed by a parameter list in parentheses and the replacement tokens.
define CUBE (X) ((X) (X) (X)) // Noncompliant void func(void).
Macro definition in c how to#
This may include either family or device defines (or sometimes both). How to pass macro definition from make command line arguments (-D) to C source code. Parenthesize all parameter names in macro definitions. Therefore functions should be used instead when possible.
MCUXpresso IDE sits on top of the GCC compiler - so all of the standard GCC defines will be available to you to check, which will change depending on the options being passed into the compiler.īeyond that, depending upon the target MCU your project is configured for and whether this is provided by the "legacy" internal part support or by importing an SDK - a variety of defines will be available inside a project (either created from the new project wizard, or from the configuration of an imported example).
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