/*
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
VTList vtlist;
/**
* Virtual Timers initialization.
* @note Internal use only.
*/
void chVTInit(void) {
vtlist.vt_next = vtlist.vt_prev = (void *)&vtlist;
vtlist.vt_time = (systime_t)-1;
vtlist.vt_systime = 0;
}
/**
* Enables a virtual timer.
* @param vtp the \p VirtualTimer structure pointer
* @param time the number of time ticks, the value zero is allowed with
* meaning "infinite". In this case the structure is initialized
* but not inserted in the delta list, the timer will never be
* triggered.
* @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, systime_t time, vtfunc_t vtfunc, void *par) {
vtp->vt_par = par;
vtp->vt_func = vtfunc;
if (time) {
VirtualTimer *p = vtlist.vt_next;
while (p->vt_time < time) {
time -= p->vt_time;
p = p->vt_next;
}
vtp->vt_prev = (vtp->vt_next = p)->vt_prev;
vtp->vt_prev->vt_next = p->vt_prev = vtp;
vtp->vt_time = time;
if (p != (void *)&vtlist)
p->vt_time -= time;
}
else
vtp->vt_next = vtp->vt_prev = vtp; // Allows a chVTResetI() on the fake timer.
}
/**
* 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 != (void *)&vtlist)
vtp->vt_next->vt_time += vtp->vt_time;
vtp->vt_prev->vt_next = vtp->vt_next;
vtp->vt_next->vt_prev = vtp->vt_prev;
vtp->vt_func = 0;
}
/**
* Checks if the current system time is within the specified time window.
* @param start the start of the time window (inclusive)
* @param end the end of the time window (non inclusive)
*/
bool_t chSysInTimeWindow(systime_t start, systime_t end) {
systime_t time = chSysGetTime();
return end >= start ? (time >= start) && (time < end) :
(time >= start) || (time < end);
}
/** @} */