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/*
ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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 3 of the License, or
(at your option) any later version.
ChibiOS/RT 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, see <http://www.gnu.org/licenses/>.
*/
/**
* @file evtimer.c
* @{
* Event Timer, this timer generates an event at regular intervals. The
* listening threads can use the event to perform time related activities.
* Multiple threads can listen to the same timer.
*/
#include <ch.h>
#include "evtimer.h"
static void tmrcb(void *p) {
EvTimer *etp = p;
chEvtSendI(&etp->et_es);
chVTSetI(&etp->et_vt, etp->et_interval, tmrcb, etp);
}
/**
* Starts the timer, if the timer was already running then the function has
* no effect.
* @param etp pointer to an initialized \p EvTimer structure.
*/
void evtStart(EvTimer *etp) {
chSysLock();
if (!etp->et_vt.vt_func)
chVTSetI(&etp->et_vt, etp->et_interval, tmrcb, etp);
chSysUnlock();
}
/**
* Stops the timer, if the timer was already stopped then the function has
* no effect.
* @param etp pointer to an initialized \p EvTimer structure.
*/
void evtStop(EvTimer *etp) {
chSysLock();
if (etp->et_vt.vt_func)
chVTResetI(&etp->et_vt);
chSysUnlock();
}
/** @} */
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