Description

OSTmrDel() allows the user to delete a timer. If a timer was running it will be stopped and then deleted. If the timer has already timed out and is therefore stopped, it will simply be deleted.

It is up to the user to delete unused timers. If deleting a timer, you must not reference it again.

Files

os.h/os_tmr.c

Prototype

CPU_BOOLEAN  OSTmrDel (OS_TMR  *p_tmr,
                       OS_ERR  *p_err)

Arguments

p_tmr

is a pointer to the timer to be deleted.

p_err

a pointer to an error code and can be any of the following:

OS_ERR_NONE

If the timer was deleted.

OS_ERR_ILLEGAL_DEL_RUN_TIME

If OS_SAFETY_CRITICAL_IEC61508 is defined: you called this after calling OSStart() and thus you are no longer allowed to delete kernel objects.

OS_ERR_OBJ_TYPE

If OS_CFG_OBJ_TYPE_CHK_EN is set to DEF_ENABLED in os_cfg.h: if the user did not pass a pointer to a timer.

OS_ERR_OS_NOT_RUNNING

If OS_CFG_INVALID_OS_CALLS_CHK_EN is set to DEF_ENABLED in os_cfg.h: if µC/OS-III is not running yet.

OS_ERR_TMR_INACTIVE

p_tmr is pointing to an inactive timer. In other words, this error appears when pointing to a timer that has been deleted.

OS_ERR_TMR_INVALID

If OS_CFG_ARG_CHK_EN is set to DEF_ENABLED in os_cfg.h: if p_tmr is a NULL pointer.

OS_ERR_TMR_INVALID_STATE

If the timer is in an invalid state.

OS_ERR_TMR_ISR

If OS_CFG_CALLED_FROM_ISR_CHK_EN set to DEF_ENABLED in os_cfg.h: This function is called from an ISR, which is not allowed.

Returned Values

DEF_TRUE if the timer was deleted, DEF_FALSE if not or an error occurred.

Required Configuration

OS_CFG_TMR_EN and OS_CFG_TMR_DEL_EN must be enabled in os_cfg.h. Refer to µC-OS-III Configuration Manual.

Callers

Application.

Notes/Warnings

Do not call this function from an ISR.
When deleting a timer, do not reference it again unless you re-create the timer by calling OSTmrCreate().

Example Usage

OSTmrDel() example usage

          OS_TMR  CloseDoorTmr;
           
           
          void Task (void *p_arg)
          {
              OS_ERR       err;
              CPU_BOOLEAN  deleted;
           
           
              (void)&p_arg;
              while (DEF_ON) {
                  deleted = OSTmrDel(&CloseDoorTmr,
                                     &err);
                  /* Check "err" */
                  :
                  :
              }
          }

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