tool/mbed/mbed-sdk/libraries/rtos/rtx/TARGET_CORTEX_M/rt_Time.c

   1 /*----------------------------------------------------------------------------
   2  *      RL-ARM - RTX
   3  *----------------------------------------------------------------------------
   4  *      Name:    RT_TIME.C
   5  *      Purpose: Delay and interval wait functions
   6  *      Rev.:    V4.60
   7  *----------------------------------------------------------------------------
   8  *
   9  * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
  10  * All rights reserved.
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions are met:
  13  *  - Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *  - Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *  - Neither the name of ARM  nor the names of its contributors may be used
  19  *    to endorse or promote products derived from this software without
  20  *    specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  *---------------------------------------------------------------------------*/
  34
  35 #include "rt_TypeDef.h"
  36 #include "RTX_Conf.h"
  37 #include "rt_Task.h"
  38 #include "rt_Time.h"
  39
  40 /*----------------------------------------------------------------------------
  41  *      Global Variables
  42  *---------------------------------------------------------------------------*/
  43
  44 /* Free running system tick counter */
  45 U32 os_time;
  46
  47
  48 /*----------------------------------------------------------------------------
  49  *      Functions
  50  *---------------------------------------------------------------------------*/
  51
  52
  53 /*--------------------------- rt_time_get -----------------------------------*/
  54
  55 U32 rt_time_get (void) {
  56   /* Get system time tick */
  57   return (os_time);
  58 }
  59
  60
  61 /*--------------------------- rt_dly_wait -----------------------------------*/
  62
  63 void rt_dly_wait (U16 delay_time) {
  64   /* Delay task by "delay_time" */
  65   rt_block (delay_time, WAIT_DLY);
  66 }
  67
  68
  69 /*--------------------------- rt_itv_set ------------------------------------*/
  70
  71 void rt_itv_set (U16 interval_time) {
  72   /* Set interval length and define start of first interval */
  73   os_tsk.run->interval_time = interval_time;
  74   os_tsk.run->delta_time = interval_time + (U16)os_time;
  75 }
  76
  77
  78 /*--------------------------- rt_itv_wait -----------------------------------*/
  79
  80 void rt_itv_wait (void) {
  81   /* Wait for interval end and define start of next one */
  82   U16 delta;
  83
  84   delta = os_tsk.run->delta_time - (U16)os_time;
  85   os_tsk.run->delta_time += os_tsk.run->interval_time;
  86   if ((delta & 0x8000) == 0) {
  87     rt_block (delta, WAIT_ITV);
  88   }
  89 }
  90
  91 /*----------------------------------------------------------------------------
  92  * end of file
  93  *---------------------------------------------------------------------------*/
  94