/* *	Delay functions for HI-TECH C on the PIC * *	Functions available: *		DelayUs(x)	Delay specified number of microseconds *		DelayMs(x)	Delay specified number of milliseconds * *	Note that there are range limits: x must not exceed 255 - for xtal *	frequencies > 12MHz the range for DelayUs is even smaller. *	To use DelayUs it is only necessary to include this file; to use *	DelayMs you must include delay.c in your project. * *//*	Set the crystal frequency in the CPP predefined symbols list in	HPDPIC, or on the PICC commmand line, e.g.	picc -DXTAL_FREQ=4MHZ		or	picc -DXTAL_FREQ=100KHZ		Note that this is the crystal frequency, the CPU clock is	divided by 4. *	MAKE SURE this code is compiled with full optimization!!!	 */#ifndef	XTAL_FREQ#define	XTAL_FREQ	4MHZ		/* Crystal frequency in MHz */#endif#define	MHZ	*1000			/* number of kHz in a MHz */#define	KHZ	*1			/* number of kHz in a kHz */#if	XTAL_FREQ >= 12MHZ#define	DelayUs(x)	{ unsigned char _dcnt; \			  _dcnt = (x)*((XTAL_FREQ)/12MHZ); \			  while(--_dcnt != 0) \				  continue; }#else#define	DelayUs(x)	{ unsigned char _dcnt; \			  _dcnt = (x)/(12MHZ/(XTAL_FREQ))|1; \			  while(--_dcnt != 0) \				  continue; }#endifextern void DelayMs(unsigned char);