mikroC

making it simple...

mikroC - C Compiler for Microchip PIC microcontrollers

Predefined Globals and Constants

To facilitate PIC programming, mikroC implements a number of predefined globals and constants.

All PIC SFR registers are implicitly declared as global variables of volatile unsigned short. These identifiers have external linkage, and are visible in the entire project. When creating a project, mikroC will include an appropriate .def file, containing declarations of available SFR and constants (such as T0IE, INTF, etc). Identifiers are all in uppercase, identical to nomenclature in Microchip datasheets. For the complete set of predefined globals and constants, look for “Defs” in your mikroC installation folder, or probe the Code Assistant for specific letters (Ctrl+Space in Editor).

Device Clock Constants

There are two built-in constants related to device clock: ___FOSC and ___FCY. Constant ___FOSC equals the frequency that is provided by an external oscillator, while ___FCY is the operating frequency of PIC. Both constants can be used anywhere in the code, and are automatically updated as you change target PIC in your project. Source files that use these constants are recompiled any time the clock is changed in IDE.

Accessing Individual Bits

mikroC allows you to access individual bits of 8-bit variables, types char and unsigned short. Simply use the direct member selector (.) with a variable, followed by one of identifiers F0, F1, … , F7. For example:

//If RB0 is set, set RC0: if (PORTB.F0) PORTC.F0 = 1;

There is no need for any special declarations; this kind of selective access is an intrinsic feature of mikroC and can be used anywhere in the code. Identifiers F0–F7are not case sensitive and have a specific namespace.

Provided you are familiar with the particular chip, you can access bits by their name:

INTCON.TMR0F = 0; // Clear TMR0F

 

 

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