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PProvost
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common/src/txe_timer_create.c
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237
common/src/txe_timer_create.c
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/**************************************************************************/
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/* */
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/* Copyright (c) Microsoft Corporation. All rights reserved. */
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/* */
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/* This software is licensed under the Microsoft Software License */
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/* Terms for Microsoft Azure RTOS. Full text of the license can be */
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/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
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/* and in the root directory of this software. */
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/* */
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/**************************************************************************/
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/**************************************************************************/
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/**************************************************************************/
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/** */
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/** ThreadX Component */
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/** */
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/** Timer */
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/** */
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/**************************************************************************/
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/**************************************************************************/
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#define TX_SOURCE_CODE
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/* Include necessary system files. */
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#include "tx_api.h"
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#include "tx_initialize.h"
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#include "tx_thread.h"
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#include "tx_timer.h"
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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* _txe_timer_create PORTABLE C */
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/* 6.0 */
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/* AUTHOR */
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/* */
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/* William E. Lamie, Microsoft Corporation */
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/* */
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/* DESCRIPTION */
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/* */
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/* This function checks for errors in the create application timer */
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/* function call. */
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/* */
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/* INPUT */
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/* */
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/* timer_ptr Pointer to timer control block */
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/* name_ptr Pointer to timer name */
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/* expiration_function Application expiration function */
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/* initial_ticks Initial expiration ticks */
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/* reschedule_ticks Reschedule ticks */
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/* auto_activate Automatic activation flag */
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/* timer_control_block_size Size of timer control block */
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/* */
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/* OUTPUT */
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/* */
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/* TX_TIMER_ERROR Invalid timer control block */
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/* TX_TICK_ERROR Invalid initial expiration count */
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/* TX_ACTIVATE_ERROR Invalid timer activation option */
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/* TX_CALLER_ERROR Invalid caller of this function */
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/* status Actual completion status */
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/* */
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/* CALLS */
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/* */
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/* _tx_thread_system_preempt_check Check for preemption */
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/* _tx_timer_create Actual timer create function */
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/* */
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/* CALLED BY */
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/* */
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/* Application Code */
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/* */
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/* RELEASE HISTORY */
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/* */
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/* DATE NAME DESCRIPTION */
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/* */
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/* 05-19-2020 William E. Lamie Initial Version 6.0 */
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/* */
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/**************************************************************************/
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UINT _txe_timer_create(TX_TIMER *timer_ptr, CHAR *name_ptr,
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VOID (*expiration_function)(ULONG id), ULONG expiration_input,
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ULONG initial_ticks, ULONG reschedule_ticks, UINT auto_activate, UINT timer_control_block_size)
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{
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TX_INTERRUPT_SAVE_AREA
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UINT status;
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ULONG i;
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TX_TIMER *next_timer;
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#ifndef TX_TIMER_PROCESS_IN_ISR
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TX_THREAD *thread_ptr;
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#endif
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/* Default status to success. */
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status = TX_SUCCESS;
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/* Check for a NULL timer pointer. */
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if (timer_ptr == TX_NULL)
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{
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/* Timer pointer is invalid, return appropriate error code. */
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status = TX_TIMER_ERROR;
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}
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/* Now check for invalid control block size. */
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else if (timer_control_block_size != (sizeof(TX_TIMER)))
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{
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/* Timer pointer is invalid, return appropriate error code. */
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status = TX_TIMER_ERROR;
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}
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else
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{
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/* Disable interrupts. */
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TX_DISABLE
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/* Increment the preempt disable flag. */
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_tx_thread_preempt_disable++;
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/* Restore interrupts. */
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TX_RESTORE
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/* Next see if it is already in the created list. */
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next_timer = _tx_timer_created_ptr;
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for (i = ((ULONG) 0); i < _tx_timer_created_count; i++)
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{
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/* Determine if this timer matches the current timer in the list. */
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if (timer_ptr == next_timer)
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{
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break;
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}
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else
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{
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/* Move to next timer. */
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next_timer = next_timer -> tx_timer_created_next;
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}
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}
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/* Disable interrupts. */
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TX_DISABLE
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/* Decrement the preempt disable flag. */
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_tx_thread_preempt_disable--;
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/* Restore interrupts. */
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TX_RESTORE
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/* Check for preemption. */
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_tx_thread_system_preempt_check();
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/* At this point, check to see if there is a duplicate timer. */
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if (timer_ptr == next_timer)
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{
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/* Timer is already created, return appropriate error code. */
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status = TX_TIMER_ERROR;
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}
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/* Check for an illegal initial tick value. */
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else if (initial_ticks == ((ULONG) 0))
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{
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/* Invalid initial tick value, return appropriate error code. */
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status = TX_TICK_ERROR;
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}
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else
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{
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/* Check for an illegal activation. */
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if (auto_activate != TX_AUTO_ACTIVATE)
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{
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/* And activation is not the other value. */
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if (auto_activate != TX_NO_ACTIVATE)
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{
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/* Invalid activation selected, return appropriate error code. */
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status = TX_ACTIVATE_ERROR;
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}
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}
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}
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}
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/* Determine if everything is okay. */
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if (status == TX_SUCCESS)
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{
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#ifndef TX_TIMER_PROCESS_IN_ISR
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/* Pickup thread pointer. */
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TX_THREAD_GET_CURRENT(thread_ptr)
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/* Check for invalid caller of this function. First check for a calling thread. */
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if (thread_ptr == &_tx_timer_thread)
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{
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/* Invalid caller of this function, return appropriate error code. */
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status = TX_CALLER_ERROR;
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}
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#endif
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/* Check for interrupt call. */
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if (TX_THREAD_GET_SYSTEM_STATE() != ((ULONG) 0))
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{
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/* Now, make sure the call is from an interrupt and not initialization. */
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if (TX_THREAD_GET_SYSTEM_STATE() < TX_INITIALIZE_IN_PROGRESS)
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{
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/* Invalid caller of this function, return appropriate error code. */
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status = TX_CALLER_ERROR;
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}
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}
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}
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/* Determine if everything is okay. */
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if (status == TX_SUCCESS)
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{
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/* Call actual application timer create function. */
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status = _tx_timer_create(timer_ptr, name_ptr, expiration_function, expiration_input,
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initial_ticks, reschedule_ticks, auto_activate);
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}
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/* Return completion status. */
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return(status);
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}
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