130 lines
4.7 KiB
C
130 lines
4.7 KiB
C
/*----------------------------------------------------------------------------
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* RL-ARM - RTX
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*----------------------------------------------------------------------------
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* Name: RT_TIMER.C
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* Purpose: User timer functions
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* Rev.: V4.70
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*----------------------------------------------------------------------------
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*
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* Copyright (c) 1999-2009 KEIL, 2009-2013 ARM Germany GmbH
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* All rights reserved.
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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 are met:
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* - 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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* - 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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* - Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 COPYRIGHT HOLDERS AND CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*---------------------------------------------------------------------------*/
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#include "rt_TypeDef.h"
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#include "RTX_Config.h"
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#include "rt_Timer.h"
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#include "rt_MemBox.h"
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/*----------------------------------------------------------------------------
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* Global Variables
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*---------------------------------------------------------------------------*/
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/* User Timer list pointer */
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struct OS_XTMR os_tmr;
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/*----------------------------------------------------------------------------
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* Functions
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*---------------------------------------------------------------------------*/
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/*--------------------------- rt_tmr_tick -----------------------------------*/
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void rt_tmr_tick (void) {
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/* Decrement delta count of timer list head. Timers having the value of */
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/* zero are removed from the list and the callback function is called. */
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P_TMR p;
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if (os_tmr.next == NULL) {
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return;
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}
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os_tmr.tcnt--;
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while (os_tmr.tcnt == 0 && (p = os_tmr.next) != NULL) {
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/* Call a user provided function to handle an elapsed timer */
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os_tmr_call (p->info);
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os_tmr.tcnt = p->tcnt;
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os_tmr.next = p->next;
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rt_free_box ((U32 *)m_tmr, p);
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}
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}
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/*--------------------------- rt_tmr_create ---------------------------------*/
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OS_ID rt_tmr_create (U16 tcnt, U16 info) {
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/* Create an user timer and put it into the chained timer list using */
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/* a timeout count value of "tcnt". User parameter "info" is used as a */
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/* parameter for the user provided callback function "os_tmr_call ()". */
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P_TMR p_tmr, p;
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U32 delta,itcnt = tcnt;
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if (tcnt == 0 || m_tmr == NULL) {
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return (NULL);
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}
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p_tmr = rt_alloc_box ((U32 *)m_tmr);
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if (!p_tmr) {
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return (NULL);
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}
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p_tmr->info = info;
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p = (P_TMR)&os_tmr;
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delta = p->tcnt;
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while (delta < itcnt && p->next != NULL) {
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p = p->next;
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delta += p->tcnt;
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}
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/* Right place found, insert timer into the list */
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p_tmr->next = p->next;
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p_tmr->tcnt = (U16)(delta - itcnt);
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p->next = p_tmr;
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p->tcnt -= p_tmr->tcnt;
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return (p_tmr);
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}
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/*--------------------------- rt_tmr_kill -----------------------------------*/
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OS_ID rt_tmr_kill (OS_ID timer) {
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/* Remove user timer from the chained timer list. */
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P_TMR p, p_tmr;
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p_tmr = (P_TMR)timer;
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p = (P_TMR)&os_tmr;
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/* Search timer list for requested timer */
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while (p->next != p_tmr) {
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if (p->next == NULL) {
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/* Failed, "timer" is not in the timer list */
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return (p_tmr);
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}
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p = p->next;
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}
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/* Timer was found, remove it from the list */
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p->next = p_tmr->next;
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p->tcnt += p_tmr->tcnt;
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rt_free_box ((U32 *)m_tmr, p_tmr);
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/* Timer killed */
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return (NULL);
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}
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/*----------------------------------------------------------------------------
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* end of file
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*---------------------------------------------------------------------------*/
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