watchtimer.c

NEC 的无线通讯方案

/*
* $Id: watchtimer.c,v 1.8 2007/10/23 07:52:04 sunny Exp $
*/
/*
*******************************************************************************
**
**  This device driver was created by Applilet for the 78K0/KB2, 78K0/KC2,
**  78K0/KD2, 78K0/KE2 and 78K0/KF2 8-Bit Single-Chip Microcontrollers.
**
**  Copyright(C) NEC Electronics Corporation 2002 - 2005
**  All rights reserved by NEC Electronics Corporation.
**
**  This program should be used on your own responsibility.
**  NEC Electronics Corporation assumes no responsibility for any losses
**  incurred by customers or third parties arising from the use of this file.
**
**  Filename :	watchtimer.c
**  Abstract :	This file implements device driver for watchtimer module.
**  APIlib :	NEC78K0KX2.lib V1.01 [09 Aug. 2005]
**
**  Device :	uPD78F0537
**
**  Compiler :	NEC/CC78K0
**
*******************************************************************************
*/

/*
*******************************************************************************
**  Include files
*******************************************************************************
*/
#include "unet.h"
#include "watchtimer.h"
/*
*******************************************************************************
**  MacroDefine
*******************************************************************************
*/

/*
**-----------------------------------------------------------------------------
**
**  Abstract:
**	This function initializes the watch timer module.
**
**  Parameters:
**	None
**
**  Returns:
**	None
**
**-----------------------------------------------------------------------------
*/
void WT_Init( void )
{
	WTM = 0;
	WTPR = 1;		/* low priority level */
	WTMK = 0;
	WTIPR = 1;		/* low priority level */
	WTIMK = 0;
	WTM.7 = 1;		/* watch timer clock: fw = fsub */
	ClrIORBit(WTM, 0x0c);	/* watch time: 2^13/fw (0.25s at 32.768Kz) */
	SetIORBit(WTM, 0x04);
	ClrIORBit(WTM, 0x70);	/* interval time: 2^5/fw */
	SetIORBit(WTM, 0x10);
}

/*
**-----------------------------------------------------------------------------
**
**  Abstract:
**	This function restarts the watch timer after stopping.
**
**  Parameters:
**	None
**
**  Returns:
**	MD_OK
**
**-----------------------------------------------------------------------------
*/
MD_STATUS WT_Start( void )
{
	/* Enable watch timer operation */
	WTM1 = 1;
	/* Start the 5-bit counter */
	WTM0 = 1;
	WTMK = 0;		/* INTWT enable */
	WTIMK = 0;		/* INTWTI enable */

	return MD_OK;
}