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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Linus Nielsen Feltzing
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "sh7034.h"
#include "system.h"
#include "debug.h"
#include "kernel.h"
void tick_start(unsigned int interval_in_ms)
{
unsigned int count;
count = FREQ / 1000 / 8 * interval_in_ms;
debugf("count = %d\n", count);
if(count > 0xffff)
{
debugf("Error! The tick interval is too long (%d ms)\n",
interval_in_ms);
return;
}
/* We are using timer 0 */
TSTR &= ~0x01; /* Stop the timer */
TSNC &= ~0x01; /* No synchronization */
TMDR &= ~0x01; /* Operate normally */
TCNT0 = 0; /* Start counting at 0 */
GRA0 = count;
TCR0 = 0x23; /* Clear at GRA match, sysclock/8 */
/* Enable interrupt on level 1 */
IPRC = (IPRC & ~0x00f0) | 0x0010;
TSR0 &= ~0x01;
TIER0 = 0xf9; /* Enable GRA match interrupt */
TSTR |= 0x01; /* Start timer 1 */
}
#pragma interrupt
void IMIA0(void)
{
current_tick++;
// debugf("t\n");
TSR0 &= ~0x01;
}
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