os_time.lst

UCOSII2.85针对8051单片机的移植版本

C51 COMPILER V7.50   OS_TIME                                                               12/14/2007 08:25:39 PAGE 1   


C51 COMPILER V7.50, COMPILATION OF MODULE OS_TIME
OBJECT MODULE PLACED IN OS_TIME.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE OS_TIME.C LARGE BROWSE DEBUG OBJECTEXTEND

line level    source

   1          /*
   2          *********************************************************************************************************
   3          *                                                uC/OS-II
   4          *                                          The Real-Time Kernel
   5          *                                             TIME MANAGEMENT
   6          *
   7          *                          (c) Copyright 1992-2007, Jean J. Labrosse, Weston, FL
   8          *                                           All Rights Reserved
   9          *
  10          * File    : OS_TIME.C
  11          * By      : Jean J. Labrosse
  12          * Version : V2.85
  13          *
  14          * LICENSING TERMS:
  15          * ---------------
  16          *   uC/OS-II is provided in source form for FREE evaluation, for educational use or for peaceful research.
             -  
  17          * If you plan on using  uC/OS-II  in a commercial product you need to contact Micri祄 to properly license 
  18          * its use in your product. We provide ALL the source code for your convenience and to help you experience 
  19          * uC/OS-II.   The fact that the  source is provided does  NOT  mean that you can use it without  paying a 
  20          * licensing fee.
  21          *********************************************************************************************************
  22          */
  23          
  24          #ifndef  OS_MASTER_FILE
  25          #include <ucos_ii.h>
  26          #endif
  27          
  28          /*
  29          *********************************************************************************************************
  30          *                                DELAY TASK 'n' TICKS   (n from 0 to 65535)
  31          *
  32          * Description: This function is called to delay execution of the currently running task until the
  33          *              specified number of system ticks expires.  This, of course, directly equates to delaying
  34          *              the current task for some time to expire.  No delay will result If the specified delay is
  35          *              0.  If the specified delay is greater than 0 then, a context switch will result.
  36          *
  37          * Arguments  : ticks     is the time delay that the task will be suspended in number of clock 'ticks'.
  38          *                        Note that by specifying 0, the task will not be delayed.
  39          *
  40          * Returns    : none
  41          *********************************************************************************************************
  42          */
  43          
  44          void  OSTimeDly (INT16U ticks) reentrant
  45          {
  46   1          INT8U      y;
  47   1      #if OS_CRITICAL_METHOD == 3                      /* Allocate storage for CPU status register           */
                  OS_CPU_SR  cpu_sr = 0;
              #endif
  50   1      
  51   1      
  52   1      
  53   1          if (OSIntNesting > 0) {                      /* See if trying to call from an ISR                  */
  54   2              return;
C51 COMPILER V7.50   OS_TIME                                                               12/14/2007 08:25:39 PAGE 2   

  55   2          }
  56   1          if (ticks > 0) {                             /* 0 means no delay!                                  */
  57   2              OS_ENTER_CRITICAL();
  58   2              y            =  OSTCBCur->OSTCBY;        /* Delay current task                                 */
  59   2              OSRdyTbl[y] &= ~OSTCBCur->OSTCBBitX;
  60   2              if (OSRdyTbl[y] == 0) {
  61   3                  OSRdyGrp &= ~OSTCBCur->OSTCBBitY;
  62   3              }
  63   2              OSTCBCur->OSTCBDly = ticks;              /* Load ticks in TCB                                  */
  64   2              OS_EXIT_CRITICAL();
  65   2              OS_Sched();                              /* Find next task to run!                             */
  66   2          }
  67   1      }
  68          /*$PAGE*/
  69          /*
  70          *********************************************************************************************************
  71          *                                     DELAY TASK FOR SPECIFIED TIME
  72          *
  73          * Description: This function is called to delay execution of the currently running task until some time
  74          *              expires.  This call allows you to specify the delay time in HOURS, MINUTES, SECONDS and
  75          *              MILLISECONDS instead of ticks.
  76          *
  77          * Arguments  : hours     specifies the number of hours that the task will be delayed (max. is 255)
  78          *              minutes   specifies the number of minutes (max. 59)
  79          *              seconds   specifies the number of seconds (max. 59)
  80          *              milli     specifies the number of milliseconds (max. 999)
  81          *
  82          * Returns    : OS_ERR_NONE
  83          *              OS_ERR_TIME_INVALID_MINUTES
  84          *              OS_ERR_TIME_INVALID_SECONDS
  85          *              OS_ERR_TIME_INVALID_MS
  86          *              OS_ERR_TIME_ZERO_DLY
  87          *              OS_ERR_TIME_DLY_ISR
  88          *
  89          * Note(s)    : The resolution on the milliseconds depends on the tick rate.  For example, you can't do
  90          *              a 10 mS delay if the ticker interrupts every 100 mS.  In this case, the delay would be
  91          *              set to 0.  The actual delay is rounded to the nearest tick.
  92          *********************************************************************************************************
  93          */
  94          
  95          #if OS_TIME_DLY_HMSM_EN > 0
  96          INT8U  OSTimeDlyHMSM (INT8U hours, INT8U minutes, INT8U seconds, INT16U ms) reentrant
  97          {
  98   1          INT32U ticks;
  99   1          INT16U loops;
 100   1      
 101   1      
 102   1          if (OSIntNesting > 0) {                      /* See if trying to call from an ISR                  */
 103   2              return (OS_ERR_TIME_DLY_ISR);
 104   2          }
 105   1      #if OS_ARG_CHK_EN > 0
                  if (hours == 0) {
                      if (minutes == 0) {
                          if (seconds == 0) {
                              if (ms == 0) {
                                  return (OS_ERR_TIME_ZERO_DLY);
                              }
                          }
                      }
                  }
                  if (minutes > 59) {
                      return (OS_ERR_TIME_INVALID_MINUTES);    /* Validate arguments to be within range              */
C51 COMPILER V7.50   OS_TIME                                                               12/14/2007 08:25:39 PAGE 3   

                  }
                  if (seconds > 59) {
                      return (OS_ERR_TIME_INVALID_SECONDS);
                  }
                  if (ms > 999) {
                      return (OS_ERR_TIME_INVALID_MS);
                  }
              #endif
 125   1                                                       /* Compute the total number of clock ticks required.. */
 126   1                                                       /* .. (rounded to the nearest tick)                   */
 127   1          ticks = ((INT32U)hours * 3600L + (INT32U)minutes * 60L + (INT32U)seconds) * OS_TICKS_PER_SEC
 128   1                + OS_TICKS_PER_SEC * ((INT32U)ms + 500L / OS_TICKS_PER_SEC) / 1000L;
 129   1          loops = (INT16U)(ticks >> 16);               /* Compute the integral number of 65536 tick delays   */
 130   1          ticks = ticks & 0xFFFFL;                     /* Obtain  the fractional number of ticks             */
 131   1          OSTimeDly((INT16U)ticks);
 132   1          while (loops > 0) {
 133   2              OSTimeDly((INT16U)32768u);
 134   2              OSTimeDly((INT16U)32768u);
 135   2              loops--;
 136   2          }
 137   1          return (OS_ERR_NONE);