85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @addtogroup VirtualTimers
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* @{
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*/
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#include <ch.h>
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#ifdef CH_USE_VIRTUAL_TIMERS
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DeltaList dlist;
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/**
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* Virtual Timers initialization. Internal use only.
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*/
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void chVTInit(void) {
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dlist.dl_next = dlist.dl_prev = (VirtualTimer *)&dlist;
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dlist.dl_dtime = (t_time)-1;
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}
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/**
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* Enables a virtual timer.
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* @param vtp the \p VirtualTimer structure pointer
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* @param time the number of time ticks
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* @param vtfunc the timer callback function. After invoking the callback
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* the timer is disabled and the structure can be disposed or
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* reused.
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* @param par a parameter that will be passed to the callback function
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* @note Must be called with the interrupts disabled.
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* @note The associated function is invoked by an interrupt handler.
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*/
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void chVTSetI(VirtualTimer *vtp, t_time time, t_vtfunc vtfunc, void *par) {
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VirtualTimer *p;
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vtp->vt_func = vtfunc;
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vtp->vt_par = par;
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p = dlist.dl_next;
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while (p->vt_dtime < time) {
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time -= p->vt_dtime;
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p = p->vt_next;
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}
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vtp->vt_prev = (vtp->vt_next = p)->vt_prev;
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vtp->vt_prev->vt_next = p->vt_prev = vtp;
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vtp->vt_dtime = time;
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if (p != (VirtualTimer *)&dlist)
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p->vt_dtime -= time;
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}
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/**
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* Disables a Virtual Timer.
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* @param vtp the \p VirtualTimer structure pointer
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* @note It must be called with the interrupts disabled.
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* @note The timer MUST be active when this function is invoked.
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*/
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void chVTResetI(VirtualTimer *vtp) {
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if (vtp->vt_next != (VirtualTimer *)&dlist)
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vtp->vt_next->vt_dtime += vtp->vt_dtime;
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vtp->vt_prev->vt_next = vtp->vt_next;
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vtp->vt_next->vt_prev = vtp->vt_prev;
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vtp->vt_func = 0;
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}
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#endif /* CH_USE_VIRTUAL_TIMER */
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/** @} */
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