/*****************************************************************************
 * Copyright (C) 2008
 * ProbeStar Telematics, LLC
 * All Rights Reserved.  Proprietary and Confidential.
 *============================================================================
 * Delay functions for PIC-16/18 at 20/40 Mhz
 *----------------------------------------------------------------------------
 * Make sure this code is compiled with optimization -O -Zg4
 *
 * Note accuracy issues below XTAL=16 MHz.
 * At or above this the loop is exactly 1 micro-second per iteration.
 * The 20MHz version is correct down to 2 micro-seconds.
 *
 * Sample delay routines from HI-TECH were pretty sucky
*****************************************************************************/

/* prevent multiple inclusions */
#ifndef _DELAY_H_
#define _DELAY_H_

/*****************************************************************************
 * includes
*****************************************************************************/

#include "system.h"
#ifdef __linux__
#include <unistd.h>
#endif

/*****************************************************************************
 * defines
*****************************************************************************/

#ifdef __linux__
//-----------------------------------------------------------------------------
// Delays mapped to sleep functions
//-----------------------------------------------------------------------------
#define	DelayInit()
#define DelayUsec(C)	usleep(C)
#define DelayMsec(C)	usleep((C)*1000)
#define	DelaySec(C)	sleep(C)
#else
//-----------------------------------------------------------------------------
// Microsecond delay routine
//-----------------------------------------------------------------------------
#if XTAL == 20
// PIC-18 20Mhz
#define DelayUs(x) { \
	_dcnt = x; \
	while(--_dcnt) { \
		asm("nop"); \
		asm("nop"); \
		asm("nop"); \
	} \
}
#elif XTAL == 40
// PIC-18 40Mhz
#define DelayUs(x) { \
	_dcnt = x; \
	while(--_dcnt) { \
		asm("nop"); \
		asm("nop"); \
		asm("nop"); \
		asm("nop"); \
		asm("nop"); \
		asm("nop"); \
		asm("nop"); \
		asm("nop"); \
	} \
}
#endif
#endif

/*****************************************************************************
 * macros
*****************************************************************************/

#ifndef __linux__
//-----------------------------------------------------------------------------
// Fixed Delays
//-----------------------------------------------------------------------------
#ifdef XTAL == 20
// 20Mhz PIC-16 or PIC-18
#define DelayNs0100() { \
	asm("nop"); \
}
#define DelayNs0200() { \
	asm("nop"); \
}
#define DelayNs0300() { \
	asm("nop"); \
	asm("nop"); \
}
#define DelayNs0400() { \
	asm("nop"); \
	asm("nop"); \
}
#define DelayNs0500() { \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
}
#define DelayNs1000() { \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
}

#elif XTAL == 40
// PIC-18 40Mhz
#define DelayNs0100() { \
	asm("nop"); \
}
#define DelayNs0200() { \
	asm("nop"); \
	asm("nop"); \
}
#define DelayNs0300() { \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
}
#define DelayNs0400() { \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
}
#define DelayNs0500() { \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
}
#define DelayNs1000() { \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
	asm("nop"); \
}
#endif

// Nanosecond delays
#define DelayNs1500() { \
	DelayNs0500(); \
	DelayNs1000(); \
}
#define DelayNs2000() { \
	DelayNs1000(); \
	DelayNs1000(); \
}
#define DelayNs3000() { \
	DelayNs2000(); \
	DelayNs1000(); \
}
#define DelayNs4000() { \
	DelayNs2000(); \
	DelayNs2000(); \
}
#define DelayNs5000() { \
	DelayNs2000(); \
	DelayNs2000(); \
	DelayNs1000(); \
}

// Microsecond delays
#define DelayUs1()	DelayNs1000()
#define DelayUs2()	DelayNs2000()
#define DelayUs3()	DelayNs3000()
#define DelayUs4()	DelayNs4000()
#define DelayUs5()	DelayNs5000()

#define DelayUs10() { \
	DelayUs5(); \
	DelayUs5(); \
}
#endif

/*****************************************************************************
 * structs & typedefs
*****************************************************************************/

/*****************************************************************************
 * global constants
*****************************************************************************/

/*****************************************************************************
 * global variables
*****************************************************************************/

#ifndef __linux__
extern LIBBANK volatile BYTE _dcnt;
#endif

/*****************************************************************************
 * C function prototypes
*****************************************************************************/
/* export C functions to C++ */
#ifdef __cplusplus
extern "C" {
#endif

#ifndef __linux__
extern void DelayInit( void );		// Timer #0 init

// library delay routines
extern void DelayUsec( BYTE byCount );	// short delays up to 50usec
extern void DelayUsecW( WORD wCount );	// longer delays over 5usec
extern void DelayMsec( WORD wCount );
extern void DelaySec( WORD wCount );
#endif

#ifdef __cpluscplus
}
#endif
#endif