99 lines
2.9 KiB
C
99 lines
2.9 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 Time
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* @{
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*/
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#include <ch.h>
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VTList vtlist;
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/**
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* Virtual Timers initialization.
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* @note Internal use only.
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*/
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void chVTInit(void) {
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vtlist.vt_next = vtlist.vt_prev = (void *)&vtlist;
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vtlist.vt_time = (systime_t)-1;
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vtlist.vt_systime = 0;
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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, the value zero is not allowed
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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, systime_t time, vtfunc_t vtfunc, void *par) {
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VirtualTimer *p;
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chDbgAssert(time != 0, "chvt.c, chVTSetI()");
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vtp->vt_par = par;
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vtp->vt_func = vtfunc;
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p = vtlist.vt_next;
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while (p->vt_time < time) {
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time -= p->vt_time;
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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_time = time;
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if (p != (void *)&vtlist)
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p->vt_time -= 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 != (void *)&vtlist)
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vtp->vt_next->vt_time += vtp->vt_time;
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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 = NULL;
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}
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/**
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* Checks if the current system time is within the specified time window.
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* @param start the start of the time window (inclusive)
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* @param end the end of the time window (non inclusive)
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*/
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bool_t chSysInTimeWindow(systime_t start, systime_t end) {
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systime_t time = chSysGetTime();
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return end >= start ? (time >= start) && (time < end) :
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(time >= start) || (time < end);
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}
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/** @} */
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