...
a pointer to an error code and can be any of the following:
OS_ERR_NONE
if the timer was deleted.
OS_ERR_OBJ_TYPE
if OS_CFG_OBJ_TYPE_CHK_EN is set to 1 in os_cfg.h: if the user did not pass a pointer to a timer.
OS_ERR_TMR_INVALID
if OS_CFG_ARG_CHK_EN is set to 1 in os_cfg.h: if p_tmr is a NULL pointer.
OS_ERR_TMR_ISR
if OS_CFG_CALLED_FROM_ISR_CHK_EN set to 1 in os_cfg.h: This function is called from an ISR, which is not allowed.
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.
...