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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 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 chvt.c
* @brief Time and Virtual Timers module code.
*
* @addtogroup time
* @details Time and Virtual Timers related APIs and services.
* @{
*/
#include "ch.h"
/*===========================================================================*/
/* Module local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Module exported variables. */
/*===========================================================================*/
/**
* @brief Virtual timers delta list header.
*/
VTList vtlist;
/*===========================================================================*/
/* Module local types. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Module exported functions. */
/*===========================================================================*/
/**
* @brief Virtual Timers initialization.
* @note Internal use only.
*
* @notapi
*/
void _vt_init(void) {
vtlist.vt_next = vtlist.vt_prev = (void *)&vtlist;
vtlist.vt_time = 0;
}
/**
* @brief Checks if the current system time is within the specified time
* window.
* @note When start==end then the function returns always true because the
* whole time range is specified.
*
* @param[in] start the start of the time window (inclusive)
* @param[in] end the end of the time window (non inclusive)
* @retval TRUE current time within the specified time window.
* @retval FALSE current time not within the specified time window.
*
* @api
*/
bool_t chVTIsSystemTimeWithin(systime_t start, systime_t end) {
systime_t time = chVTGetSystemTime();
return end > start ? (time >= start) && (time < end) :
(time >= start) || (time < end);
}
/**
* @brief Enables a virtual timer.
* @details The timer is enabled and programmed to trigger at the absolute
* system time specified as parameter.
* @note The associated function is invoked from interrupt context.
*
* @param[out] vtp the @p VirtualTimer structure pointer
* @param[in] time absolute system time
* @param[in] vtfunc the timer callback function. After invoking the
* callback the timer is disabled and the structure can
* be disposed or reused.
* @param[in] par a parameter that will be passed to the callback
* function
*
* @iclass
*/
void chVTSetAbsoluteI(VirtualTimer *vtp, systime_t time,
vtfunc_t vtfunc, void *par) {
VirtualTimer *p;
systime_t systime = vtlist.vt_time;
chDbgCheckClassI();
chDbgCheck((vtp != NULL) && (vtfunc != NULL), "chVTSetI");
vtp->vt_par = par;
vtp->vt_func = vtfunc;
vtp->vt_time = time;
if (time <= systime) {
p = vtlist.vt_prev;
while ((p->vt_time <= systime) && (p->vt_time > time))
p = p->vt_prev;
vtp->vt_next = (vtp->vt_prev = p)->vt_next;
vtp->vt_next->vt_prev = p->vt_next = vtp;
}
else {
p = vtlist.vt_next;
while ((p->vt_time > systime) && (p->vt_time < time))
p = p->vt_next;
vtp->vt_prev = (vtp->vt_next = p)->vt_prev;
vtp->vt_prev->vt_next = p->vt_prev = vtp;
}
}
/**
* @brief Disables a Virtual Timer.
* @note The timer is first checked and disabled only if armed.
*
* @param[in] vtp the @p VirtualTimer structure pointer
*
* @iclass
*/
void chVTResetI(VirtualTimer *vtp) {
chDbgCheckClassI();
chDbgCheck(vtp != NULL, "chVTResetI");
if (chVTIsArmedI(vtp)) {
vtp->vt_prev->vt_next = vtp->vt_next;
vtp->vt_next->vt_prev = vtp->vt_prev;
vtp->vt_func = (vtfunc_t)NULL;
}
}
/** @} */
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