Henrik Ekblad
2fd948fc66
Upgraded RF24 to latest version which supports SoftSPI. Added DigitalIO and UTFT libraries to support the new example. Fix problem reported in RelayWithButtonActuator example.
128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
/**
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* \addtogroup timer
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* @{
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*/
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/**
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* \file
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* Timer library implementation.
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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/*
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* Copyright (c) 2004, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the uIP TCP/IP stack
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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* $Id: timer.c,v 1.2 2006/06/12 08:00:30 adam Exp $
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*/
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#include "uip_clock.h"
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#include "uip_timer.h"
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/*---------------------------------------------------------------------------*/
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/**
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* Set a timer.
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*
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* This function is used to set a timer for a time sometime in the
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* future. The function timer_expired() will evaluate to true after
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* the timer has expired.
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*
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* \param t A pointer to the timer
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* \param interval The interval before the timer expires.
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*
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*/
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void
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uip_timer_set(struct uip_timer *t, clock_time_t interval)
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{
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t->interval = interval;
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t->start = clock_time();
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Reset the timer with the same interval.
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*
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* This function resets the timer with the same interval that was
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* given to the timer_set() function. The start point of the interval
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* is the exact time that the timer last expired. Therefore, this
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* function will cause the timer to be stable over time, unlike the
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* timer_rester() function.
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*
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* \param t A pointer to the timer.
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*
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* \sa timer_restart()
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*/
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void
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uip_timer_reset(struct uip_timer *t)
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{
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t->start += t->interval;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Restart the timer from the current point in time
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*
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* This function restarts a timer with the same interval that was
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* given to the timer_set() function. The timer will start at the
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* current time.
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*
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* \note A periodic timer will drift if this function is used to reset
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* it. For preioric timers, use the timer_reset() function instead.
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*
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* \param t A pointer to the timer.
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*
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* \sa timer_reset()
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*/
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void
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uip_timer_restart(struct uip_timer *t)
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{
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t->start = clock_time();
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Check if a timer has expired.
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*
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* This function tests if a timer has expired and returns true or
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* false depending on its status.
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*
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* \param t A pointer to the timer
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*
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* \return Non-zero if the timer has expired, zero otherwise.
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*
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*/
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int
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uip_timer_expired(struct uip_timer *t)
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{
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return (clock_time_t)(clock_time() - t->start) >= (clock_time_t)t->interval;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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