drivers/timers_kernel/timers_kernel.c
author etisserant
Tue, 12 Feb 2008 11:52:45 +0100
changeset 392 3788feef57e0
parent 391 7802a7d5584f
child 467 40efa79d27dd
permissions -rw-r--r--
Some typo fixes in the manual, thanks to Yegor Yefremov (VisionSystems)
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/*
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This file is part of CanFestival, a library implementing CanOpen Stack. 
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Copyright (C): Edouard TISSERANT and Francis DUPIN
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See COPYING file for copyrights details.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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*/
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#include <linux/spinlock.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <linux/errno.h>
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#include "timer.h"
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#include "applicfg.h"
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static spinlock_t lock = SPIN_LOCK_UNLOCKED;
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static struct timer_list timer;
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static TIMEVAL last_time_read,
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	last_occured_alarm,
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	last_alarm_set;
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void EnterMutex(void)
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{
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	spin_lock (&lock);
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}
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void LeaveMutex(void)
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{
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	spin_unlock (&lock);
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}
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void timer_notify(unsigned long data)
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{
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	last_occured_alarm = last_alarm_set;
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	EnterMutex();
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	TimeDispatch();
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	LeaveMutex();
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}
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void StartTimerLoop(TimerCallback_t init_callback)
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{
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	getElapsedTime();
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	last_alarm_set = last_time_read;
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	last_occured_alarm = last_alarm_set;
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	init_timer(&timer);
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	timer.function = timer_notify;
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	EnterMutex();
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	// At first, TimeDispatch will call init_callback.
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	SetAlarm(NULL, 0, init_callback, 0, 0);
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	LeaveMutex();
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}
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void StopTimerLoop(void)
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{
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	EnterMutex();
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	del_timer (&timer);
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	LeaveMutex();
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}
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void setTimer(TIMEVAL value)
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{
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	if (value == TIMEVAL_MAX)
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		return;
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	last_alarm_set = last_time_read + value;
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	mod_timer (&timer, last_alarm_set);
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}
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TIMEVAL getElapsedTime(void)
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{
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	last_time_read = jiffies;
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	return (long)last_time_read - (long)last_occured_alarm;
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}
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void CreateReceiveTask(CAN_PORT port, TASK_HANDLE *Thread, void* ReceiveLoopPtr)
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{
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	*Thread = kthread_run(ReceiveLoopPtr, port, "canReceiveLoop");
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}
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void WaitReceiveTaskEnd(TASK_HANDLE Thread)
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{
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	force_sig (SIGTERM, Thread);
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}