time.c

arm7,44b0芯片的blob程序,适用于学嵌入式linux的新手.

/*-------------------------------------------------------------------------
 * Filename:      time.c
 * Version:       $Id: time.c,v 1.3 2001/10/07 20:16:57 erikm Exp $
 * Copyright:     Copyright (C) 1999, Erik Mouw
 * Author:        Erik Mouw <[e-mail]>
 * Description:   Some easy timer functions for blob
 * Created at:    Tue Aug 24 21:08:25 1999
 * Modified by:   Erik Mouw <[e-mail]>
 * Modified at:   Sun Oct  3 21:10:21 1999
 *-----------------------------------------------------------------------*/
/*
 * timer.c: Timer functions for blob
 *
 * Copyright (C) 1999 2000 2001  Erik Mouw ([e-mail])
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ident "$Id: time.c,v 1.3 2001/10/07 20:16:57 erikm Exp $"

#ifdef HAVE_CONFIG_H
# include <blob/config.h>
#endif

#include <blob/arch.h>
#include <blob/init.h>
#include <blob/led.h>
#include <blob/time.h>

extern int ticks;

void TimerInit(void)
{

	REG(TCFG0) = 0x001e0000;
	REG(TCFG1) = 0x00000000;
	REG(TCNTB5) = 0x2710;
	REG(TCON) = 0x06000000;
	REG(TCON) = 0x05000000;
	ticks = 1;
}

/* returns the time in 1/TICKS_PER_SECOND seconds */
u32  TimerGetTime(void)
{
//	return ticks*10000 - REG(TCNTO5);
	return ticks;
}

void TimerClearOverflow(void)
{
}

void msleep(unsigned int msec)
{
	int tk, start, end;

	start = TimerGetTime();
//	end = start + 1000;
	end = start + msec;

	do{
		tk = TimerGetTime();
	}while(tk<end);
}