/*
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 .
*/
/**
* @addtogroup VirtualTimers
* @{
*/
#include
#ifdef CH_USE_VIRTUAL_TIMERS
DeltaList dlist;
/**
* Virtual Timers initialization. Internal use only.
*/
void chVTInit(void) {
dlist.dl_next = dlist.dl_prev = (VirtualTimer *)&dlist;
dlist.dl_dtime = (t_time)-1;
}
/**
* Enables a virtual timer.
* @param vtp the \p VirtualTimer structure pointer
* @param time the number of time ticks
* @param vtfunc the timer callback function. After invoking the callback
* the timer is disabled and the structure can be disposed or
* reused.
* @param par a parameter that will be passed to the callback function
* @note Must be called with the interrupts disabled.
* @note The associated function is invoked by an interrupt handler.
*/
void chVTSetI(VirtualTimer *vtp, t_time time, t_vtfunc vtfunc, void *par) {
VirtualTimer *p;
vtp->vt_func = vtfunc;
vtp->vt_par = par;
p = dlist.dl_next;
while (p->vt_dtime < time) {
time -= p->vt_dtime;
p = p->vt_next;
}
vtp->vt_prev = (vtp->vt_next = p)->vt_prev;
vtp->vt_prev->vt_next = p->vt_prev = vtp;
vtp->vt_dtime = time;
if (p != (VirtualTimer *)&dlist)
p->vt_dtime -= time;
}
/**
* Disables a Virtual Timer.
* @param vtp the \p VirtualTimer structure pointer
* @note It must be called with the interrupts disabled.
* @note The timer MUST be active when this function is invoked.
*/
void chVTResetI(VirtualTimer *vtp) {
if (vtp->vt_next != (VirtualTimer *)&dlist)
vtp->vt_next->vt_dtime += vtp->vt_dtime;
vtp->vt_prev->vt_next = vtp->vt_next;
vtp->vt_next->vt_prev = vtp->vt_prev;
vtp->vt_func = 0;
}
#endif /* CH_USE_VIRTUAL_TIMER */
/** @} */