rt_Time.c

00001 /*----------------------------------------------------------------------------
00002  *      RL-ARM - RTX
00003  *----------------------------------------------------------------------------
00004  *      Name:    RT_TIME.C
00005  *      Purpose: Delay and interval wait functions
00006  *      Rev.:    V4.60
00007  *----------------------------------------------------------------------------
00008  *
00009  * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
00010  * All rights reserved.
00011  * Redistribution and use in source and binary forms, with or without
00012  * modification, are permitted provided that the following conditions are met:
00013  *  - Redistributions of source code must retain the above copyright
00014  *    notice, this list of conditions and the following disclaimer.
00015  *  - Redistributions in binary form must reproduce the above copyright
00016  *    notice, this list of conditions and the following disclaimer in the
00017  *    documentation and/or other materials provided with the distribution.
00018  *  - Neither the name of ARM  nor the names of its contributors may be used 
00019  *    to endorse or promote products derived from this software without 
00020  *    specific prior written permission.
00021  *
00022  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
00023  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
00024  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00025  * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
00026  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00027  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
00028  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
00029  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
00030  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
00031  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00032  * POSSIBILITY OF SUCH DAMAGE.
00033  *---------------------------------------------------------------------------*/
00034 
00035 #include "rt_TypeDef.h"
00036 #include "RTX_Conf.h"
00037 #include "rt_Task.h"
00038 #include "rt_Time.h"
00039 
00040 /*----------------------------------------------------------------------------
00041  *      Global Variables
00042  *---------------------------------------------------------------------------*/
00043 
00044 /* Free running system tick counter */
00045 U32 os_time;
00046 
00047 
00048 /*----------------------------------------------------------------------------
00049  *      Functions
00050  *---------------------------------------------------------------------------*/
00051 
00052 
00053 /*--------------------------- rt_time_get -----------------------------------*/
00054 
00055 U32 rt_time_get (void) {
00056   /* Get system time tick */
00057   return (os_time);
00058 }
00059 
00060 
00061 /*--------------------------- rt_dly_wait -----------------------------------*/
00062 
00063 void rt_dly_wait (U16 delay_time) {
00064   /* Delay task by "delay_time" */
00065   rt_block (delay_time, WAIT_DLY);
00066 }
00067 
00068 
00069 /*--------------------------- rt_itv_set ------------------------------------*/
00070 
00071 void rt_itv_set (U16 interval_time) {
00072   /* Set interval length and define start of first interval */
00073   os_tsk.run->interval_time = interval_time;
00074   os_tsk.run->delta_time = interval_time + (U16)os_time;
00075 }
00076 
00077 
00078 /*--------------------------- rt_itv_wait -----------------------------------*/
00079 
00080 void rt_itv_wait (void) {
00081   /* Wait for interval end and define start of next one */
00082   U16 delta;
00083 
00084   delta = os_tsk.run->delta_time - (U16)os_time;
00085   os_tsk.run->delta_time += os_tsk.run->interval_time;
00086   if ((delta & 0x8000) == 0) {
00087     rt_block (delta, WAIT_ITV);
00088   }
00089 }
00090 
00091 /*----------------------------------------------------------------------------
00092  * end of file
00093  *---------------------------------------------------------------------------*/
00094