122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012,2013 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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A special exception to the GPL can be applied should you wish to distribute
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a combined work that includes ChibiOS/RT, without being obliged to provide
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the source code for any proprietary components. See the file exception.txt
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for full details of how and when the exception can be applied.
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*/
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/**
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* @file chvt.c
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* @brief Time and Virtual Timers related code.
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*
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* @addtogroup time
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* @details Time and Virtual Timers related APIs and services.
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* @{
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*/
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#include "ch.h"
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/**
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* @brief Virtual timers delta list header.
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*/
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VTList vtlist;
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/**
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* @brief Virtual Timers initialization.
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* @note Internal use only.
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*
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* @notapi
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*/
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void _vt_init(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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* @brief Enables a virtual timer.
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* @note The associated function is invoked from interrupt context.
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*
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* @param[out] vtp the @p VirtualTimer structure pointer
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* @param[in] time the number of ticks before the operation timeouts, the
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* special values are handled as follow:
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* - @a TIME_INFINITE is allowed but interpreted as a
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* normal time specification.
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* - @a TIME_IMMEDIATE this value is not allowed.
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* .
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* @param[in] vtfunc the timer callback function. After invoking the
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* callback the timer is disabled and the structure can
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* be disposed or reused.
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* @param[in] par a parameter that will be passed to the callback
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* function
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*
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* @iclass
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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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chDbgCheckClassI();
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chDbgCheck((vtp != NULL) && (vtfunc != NULL) && (time != TIME_IMMEDIATE),
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"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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* @brief Disables a Virtual Timer.
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* @note The timer MUST be active when this function is invoked.
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*
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* @param[in] vtp the @p VirtualTimer structure pointer
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*
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* @iclass
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*/
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void chVTResetI(VirtualTimer *vtp) {
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chDbgCheckClassI();
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chDbgCheck(vtp != NULL, "chVTResetI");
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chDbgAssert(vtp->vt_func != NULL,
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"chVTResetI(), #1",
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"timer not set or already triggered");
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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 = (vtfunc_t)NULL;
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}
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/** @} */
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