Input Capture

[Oliver Kan]

Hi Guys,

In the file radioIn.c , for input capture module 

why do i get those hash tags  (IC##x##CO##z = IC2VAL;) are those hashtags supposed to represent something if so what?

and on that note- REGTOK1 N what does that mean ?

#define REGTOK1 N
	#define REGTOK2 N
	#define IC1VAL 0x0081
	#endif
	#define IC2VAL 0 // SYNCSEL = 0x00: no sync, no trigger, rollover at 0xFFFF
	#define _IC_INIT(x, y, z) \
	{ \
	IC##x##CO##z = IC2VAL; \
	IC##x##CO##y = IC1VAL; \
	_IC##x##IP = INT_PRI_IC; \
	_IC##x##IF = 0; \
	_IC##x##IE = 1; \
	}
	#define IC_INIT(x, y, z) _IC_INIT(x, y, z)

Cheers

Oliver

[Peter Hollands]

Oliver,

The ##s puzzled me when I first saw them a few years back; I did not know that this form of macro substitution existed,

The ##'s are a form of C macro instruction.  An explanation is given here on this tutorial site.

They are used to reduce repetition of blocks of code in the C source code.

MPLAB-X (mine is at version 5.3) will show you the complete macro expansion (after processing all macros including ##s).

This is useful to confirm that the Macros are doing what you hope !

While in radioIn.c, place your cursor over a macro and right click to select "Navigate" / "View Macro Expansion".

(see screenshot enclosed).  This will then open a new window showing the whole of radioIn.c with all macros expanded.

I enclose a second screenshot, with the macros expanded for my setup of MatrixPilot for HILSIM with a model easystar.

I hope that helps.

Best wishes, Pete

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