common/src/txe_timer_change.c


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/**************************************************************************/
/*                                                                        */
/*       Copyright (c) Microsoft Corporation. All rights reserved.        */
/*                                                                        */
/*       This software is licensed under the Microsoft Software License   */
/*       Terms for Microsoft Azure RTOS. Full text of the license can be  */
/*       found in the LICENSE file at https://aka.ms/AzureRTOS_EULA       */
/*       and in the root directory of this software.                      */
/*                                                                        */
/**************************************************************************/


/**************************************************************************/
/**************************************************************************/
/**                                                                       */
/** ThreadX Component                                                     */
/**                                                                       */
/**   Timer                                                               */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/

#define TX_SOURCE_CODE


/* Include necessary system files.  */

#include "tx_api.h"
#include "tx_initialize.h"
#include "tx_thread.h"
#include "tx_timer.h"


/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _txe_timer_change                                   PORTABLE C      */
/*                                                           6.1          */
/*  AUTHOR                                                                */
/*                                                                        */
/*    William E. Lamie, Microsoft Corporation                             */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function checks for errors in the application timer change     */
/*    function call.                                                      */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    timer_ptr                         Pointer to timer control block    */
/*    initial_ticks                     Initial expiration ticks          */
/*    reschedule_ticks                  Reschedule ticks                  */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    TX_TIMER_ERROR                    Invalid application timer pointer */
/*    TX_TICK_ERROR                     Invalid initial tick value of 0   */
/*    TX_CALLER_ERROR                   Invalid caller of this function   */
/*    status                            Actual completion status          */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _tx_timer_change                  Actual timer change function      */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    Application Code                                                    */
/*                                                                        */
/*  RELEASE HISTORY                                                       */
/*                                                                        */
/*    DATE              NAME                      DESCRIPTION             */
/*                                                                        */
/*  05-19-2020     William E. Lamie         Initial Version 6.0           */
/*  09-30-2020     Yuxin Zhou               Modified comment(s),          */
/*                                            resulting in version 6.1    */
/*                                                                        */
/**************************************************************************/
UINT  _txe_timer_change(TX_TIMER *timer_ptr, ULONG initial_ticks, ULONG reschedule_ticks)
{

UINT    status;


    /* Check for an invalid timer pointer.  */
    if (timer_ptr == TX_NULL)
    {

        /* Timer pointer is invalid, return appropriate error code.  */
        status =  TX_TIMER_ERROR;
    }
    
    /* Now check for invalid timer ID.  */
    else if (timer_ptr -> tx_timer_id != TX_TIMER_ID)
    {

        /* Timer pointer is invalid, return appropriate error code.  */
        status =  TX_TIMER_ERROR;
    }

    /* Check for an illegal initial tick value.  */
    else if (initial_ticks == ((ULONG) 0))
    {

        /* Invalid initial tick value, return appropriate error code.  */
        status =  TX_TICK_ERROR;
    }

    /* Check for invalid caller of this function.  */
    else if (TX_THREAD_GET_SYSTEM_STATE() >= TX_INITIALIZE_IN_PROGRESS)
    {

        /* Invalid caller of this function, return appropriate error code.  */
        status =  TX_CALLER_ERROR;
    }
    else
    {

        /* Call actual application timer function.  */
        status =  _tx_timer_change(timer_ptr, initial_ticks, reschedule_ticks);
    }
    
    /* Return completion status.  */
    return(status);
}