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Delay functions for HI-TECH C on the PIC

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Submitted on: 1/13/2004 6:25:45 PM
By: SouthOfHeaven  
Level: Advanced
User Rating: Unrated
Compatibility: C
Views: 6899
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     Delay functions for HI-TECH C on the PIC
 
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//**************************************
// Name: Delay functions for HI-TECH C on the PIC
// Description:Delay functions for HI-TECH C on the PIC
// By: SouthOfHeaven
//
//This code is copyrighted and has// limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=7421&lngWId=3//for details.//**************************************

/*
 *	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.*/
#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; }
#endif
extern void DelayMs(unsigned char);


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