To facilitate AVR programming, the mikroC PRO for AVR implements a number of predefined globals and constants.

All AVR SFR registers and their bits are implicitly declared as global variables. These identifiers have an external linkage, and are visible in the entire project. When creating a project, the mikroC PRO for AVR will include an appropriate (*.c) file from defs folder, containing declarations of available SFR registers and constants.

For a complete set of predefined globals and constants, look for “Defs” in the mikroC PRO for AVR installation folder, or probe the Code Assistant for specific letters (Ctrl+Space in the Code Editor).

Predefined project level defines

mikroC PRO for AVR provides several predefined project level defines that you can use in your project :

• First one is equal to the name of selected device for the project i.e. if ATmega16 is selected device, then ATmega16 token will be defined as 1, so it can be used for conditional compilation:

    #ifdef ATmega16
    ...
    #endif

• The second one is value of frequency (in kHz) for which the project is built :

    #ifdef __FOSC__ == 80000
    ...
    #endif

• Third one is for identifying mikroC PRO for AVR compiler:

    #ifdef __mikroc_pro_FOR_avr__
    ...
    #endif

• Fourth one is for identifying the build version. For instance, if a desired build version is 142, user should put this in his code:

    #if __mikroc_pro_FOR_avr_BUILD__ == 142 
    ...
    #endif

User can define custom project level defines.

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