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authorPProvost <[email protected]>2020-05-11 08:55:07 -0600
committerPProvost <[email protected]>2020-05-11 08:55:07 -0600
commit852421fda03a7722d7adb45b187235cd66fa264e (patch)
treeb117e1339a047347a3d7ebf3eeb1891168cc9b9b /common/src/tx_timer_initialize.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_thread.h"
+#include "tx_timer.h"
+
+
+/* Check for the TX_NO_TIMER option. When defined, do not define all of the
+ timer component global variables. */
+
+#ifndef TX_NO_TIMER
+
+
+/* Define the system clock value that is continually incremented by the
+ periodic timer interrupt processing. */
+
+volatile ULONG _tx_timer_system_clock;
+
+
+/* Define the time-slice expiration flag. This is used to indicate that a time-slice
+ has happened. */
+
+UINT _tx_timer_expired_time_slice;
+
+
+/* Define the thread and application timer entry list. This list provides a direct access
+ method for insertion of times less than TX_TIMER_ENTRIES. */
+
+TX_TIMER_INTERNAL *_tx_timer_list[TX_TIMER_ENTRIES];
+
+
+/* Define the boundary pointers to the list. These are setup to easily manage
+ wrapping the list. */
+
+TX_TIMER_INTERNAL **_tx_timer_list_start;
+TX_TIMER_INTERNAL **_tx_timer_list_end;
+
+
+/* Define the current timer pointer in the list. This pointer is moved sequentially
+ through the timer list by the timer interrupt handler. */
+
+TX_TIMER_INTERNAL **_tx_timer_current_ptr;
+
+
+/* Define the timer expiration flag. This is used to indicate that a timer
+ has expired. */
+
+UINT _tx_timer_expired;
+
+
+/* Define the created timer list head pointer. */
+
+TX_TIMER *_tx_timer_created_ptr;
+
+
+/* Define the created timer count. */
+
+ULONG _tx_timer_created_count;
+
+
+/* Define the pointer to the timer that has expired and is being processed. */
+
+TX_TIMER_INTERNAL *_tx_timer_expired_timer_ptr;
+
+
+#ifndef TX_TIMER_PROCESS_IN_ISR
+
+/* Define the timer thread's control block. */
+
+TX_THREAD _tx_timer_thread;
+
+
+/* Define the variable that holds the timer thread's starting stack address. */
+
+VOID *_tx_timer_stack_start;
+
+
+/* Define the variable that holds the timer thread's stack size. */
+
+ULONG _tx_timer_stack_size;
+
+
+/* Define the variable that holds the timer thread's priority. */
+
+UINT _tx_timer_priority;
+
+/* Define the system timer thread's stack. The default size is defined
+ in tx_port.h. */
+
+ULONG _tx_timer_thread_stack_area[(((UINT) TX_TIMER_THREAD_STACK_SIZE)+((sizeof(ULONG))- ((UINT) 1)))/(sizeof(ULONG))];
+
+#else
+
+
+/* Define the busy flag that will prevent nested timer ISR processing. */
+
+UINT _tx_timer_processing_active;
+
+#endif
+
+#ifdef TX_TIMER_ENABLE_PERFORMANCE_INFO
+
+/* Define the total number of timer activations. */
+
+ULONG _tx_timer_performance_activate_count;
+
+
+/* Define the total number of timer reactivations. */
+
+ULONG _tx_timer_performance_reactivate_count;
+
+
+/* Define the total number of timer deactivations. */
+
+ULONG _tx_timer_performance_deactivate_count;
+
+
+/* Define the total number of timer expirations. */
+
+ULONG _tx_timer_performance_expiration_count;
+
+
+/* Define the total number of timer expiration adjustments. These are required
+ if the expiration time is greater than the size of the timer list. In such
+ cases, the timer is placed at the end of the list and then reactivated
+ as many times as necessary to finally achieve the resulting timeout. */
+
+ULONG _tx_timer_performance__expiration_adjust_count;
+
+#endif
+#endif
+
+
+/* Define the current time slice value. If non-zero, a time-slice is active.
+ Otherwise, the time_slice is not active. */
+
+ULONG _tx_timer_time_slice;
+
+
+/**************************************************************************/
+/* */
+/* FUNCTION RELEASE */
+/* */
+/* _tx_timer_initialize PORTABLE C */
+/* 6.0 */
+/* AUTHOR */
+/* */
+/* William E. Lamie, Microsoft Corporation */
+/* */
+/* DESCRIPTION */
+/* */
+/* This function initializes the various control data structures for */
+/* the clock control component. */
+/* */
+/* INPUT */
+/* */
+/* None */
+/* */
+/* OUTPUT */
+/* */
+/* None */
+/* */
+/* CALLS */
+/* */
+/* _tx_thread_create Create the system timer thread */
+/* */
+/* CALLED BY */
+/* */
+/* _tx_initialize_high_level High level initialization */
+/* */
+/* RELEASE HISTORY */
+/* */
+/* DATE NAME DESCRIPTION */
+/* */
+/* 05-19-2020 William E. Lamie Initial Version 6.0 */
+/* */
+/**************************************************************************/
+VOID _tx_timer_initialize(VOID)
+{
+#ifndef TX_NO_TIMER
+#ifndef TX_TIMER_PROCESS_IN_ISR
+UINT status;
+#endif
+
+#ifndef TX_DISABLE_REDUNDANT_CLEARING
+
+ /* Initialize the system clock to 0. */
+ _tx_timer_system_clock = ((ULONG) 0);
+
+ /* Initialize the time-slice value to 0 to make sure it is disabled. */
+ _tx_timer_time_slice = ((ULONG) 0);
+
+ /* Clear the expired flags. */
+ _tx_timer_expired_time_slice = TX_FALSE;
+ _tx_timer_expired = TX_FALSE;
+
+ /* Set the currently expired timer being processed pointer to NULL. */
+ _tx_timer_expired_timer_ptr = TX_NULL;
+
+ /* Initialize the thread and application timer management control structures. */
+
+ /* First, initialize the timer list. */
+ TX_MEMSET(&_tx_timer_list[0], 0, (sizeof(_tx_timer_list)));
+#endif
+
+ /* Initialize all of the list pointers. */
+ _tx_timer_list_start = &_tx_timer_list[0];
+ _tx_timer_current_ptr = &_tx_timer_list[0];
+
+ /* Set the timer list end pointer to one past the actual timer list. This is done
+ to make the timer interrupt handling in assembly language a little easier. */
+ _tx_timer_list_end = &_tx_timer_list[TX_TIMER_ENTRIES-((ULONG) 1)];
+ _tx_timer_list_end = TX_TIMER_POINTER_ADD(_tx_timer_list_end, ((ULONG) 1));
+
+#ifndef TX_TIMER_PROCESS_IN_ISR
+
+ /* Setup the variables associated with the system timer thread's stack and
+ priority. */
+ _tx_timer_stack_start = (VOID *) &_tx_timer_thread_stack_area[0];
+ _tx_timer_stack_size = ((ULONG) TX_TIMER_THREAD_STACK_SIZE);
+ _tx_timer_priority = ((UINT) TX_TIMER_THREAD_PRIORITY);
+
+ /* Create the system timer thread. This thread processes all of the timer
+ expirations and reschedules. Its stack and priority are defined in the
+ low-level initialization component. */
+ do
+ {
+
+ /* Create the system timer thread. */
+ status = _tx_thread_create(&_tx_timer_thread,
+ TX_CONST_CHAR_TO_CHAR_POINTER_CONVERT("System Timer Thread"),
+ _tx_timer_thread_entry,
+ ((ULONG) TX_TIMER_ID),
+ _tx_timer_stack_start, _tx_timer_stack_size,
+ _tx_timer_priority, _tx_timer_priority, TX_NO_TIME_SLICE, TX_DONT_START);
+
+#ifdef TX_SAFETY_CRITICAL
+
+ /* Check return from thread create - if an error is detected throw an exception. */
+ if (status != TX_SUCCESS)
+ {
+
+ /* Raise safety critical exception. */
+ TX_SAFETY_CRITICAL_EXCEPTION(__FILE__, __LINE__, status);
+ }
+#endif
+
+ /* Define timer initialize extension. */
+ TX_TIMER_INITIALIZE_EXTENSION(status)
+
+ } while (status != TX_SUCCESS);
+
+#else
+
+ /* Clear the timer interrupt processing active flag. */
+ _tx_timer_processing_active = TX_FALSE;
+#endif
+
+#ifndef TX_DISABLE_REDUNDANT_CLEARING
+
+ /* Initialize the head pointer of the created application timer list. */
+ _tx_timer_created_ptr = TX_NULL;
+
+ /* Set the created count to zero. */
+ _tx_timer_created_count = TX_EMPTY;
+
+#ifdef TX_TIMER_ENABLE_PERFORMANCE_INFO
+
+ /* Initialize timer performance counters. */
+ _tx_timer_performance_activate_count = ((ULONG) 0);
+ _tx_timer_performance_reactivate_count = ((ULONG) 0);
+ _tx_timer_performance_deactivate_count = ((ULONG) 0);
+ _tx_timer_performance_expiration_count = ((ULONG) 0);
+ _tx_timer_performance__expiration_adjust_count = ((ULONG) 0);
+#endif
+#endif
+#endif
+}
+