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utility/low_power/low_power.md Normal file
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---
title: Low Power Utility
author: sclarson
ms.author: sclarson
description: This article is a summary of the Low Power utility APIs available in ThreadX.
ms.date: 03/02/2021
ms.topic: article
ms.service: rtos
---
# Low Power APIs
## Summary of Low Power APIs
There are additional API functions available for low power, as follows:
- ***tx_low_power_enter*** - *Enter low power mode*
- ***tx_low_power_exit*** - *Exit low power mode*
- ***tx_time_increment*** - *Increment ThreadX timers by specific amount*
- ***tx_timer_get_next*** - *Get next ThreadX timer expiration*
---
## User-defined Macros
- **TX_LOW_POWER_TIMER_SETUP** - an optional macro to a user routine that sets up a low power clock. To set up a low power timer or operate ticklessly in low power mode, this must be defined. This is called in **tx_low_power_enter**.
- **TX_LOW_POWER_TICKLESS** - an optional define to operate ticklessly in low power mode. Symbol **TX_LOW_POWER_TIMER_SETUP** must also be defined. With this defined, there is no need to set up a low power timer to keep track of time. ThreadX will not maintain/update the internal tick count during or after exiting low power mode.
- **TX_LOW_POWER_USER_ENTER** - an optional macro to a user routine that configures the processor for entering low power mode (e.g. turn off peripherals and select a sleep mode). This is called in **tx_low_power_enter**.
- **TX_LOW_POWER_USER_EXIT** - an optional macro to a user routine that configures the processor for exiting low power mode (e.g. turn on peripherals). This is called in **tx_low_power_exit**.
- **TX_LOW_POWER_USER_TIMER_ADJUST** - an optional user macro to determine how much time has elapsed while in low power mode (in units of ThreadX ticks). This is called in **tx_low_power_exit** to get the number of ticks needed to adjust the ThreadX timers.
## tx_low_power_enter
Enter low power mode.
### Prototype
```c
VOID tx_low_power_enter(VOID);
```
### Description
This service enters low power mode.
For keeping track of time while in low power mode, there are two possibilities:
1. A ThreadX timer is active. Function **tx_timer_get_next** returns **TX_TRUE**. Note that in this situation, a low power clock must be used in order to wake up the CPU for the next ThreadX timer expiration. Therefore an alternative clock must be programmed. Program the hardware timer source such that the next timer interrupt is equal to: *tx_low_power_next_expiration \* tick_frequency*. The *tick_frequency* is application-specific and typically set up in **tx_low_level_initialize**.
2. There are no ThreadX timers active. Function **tx_timer_get_next** returns **TX_FALSE**.
1. The application may choose not to keep the ThreadX internal
tick count updated (define **TX_LOW_POWER_TICKLESS**), therefore there is no need
to set up a low power clock.
2. The application still needs to keep the ThreadX tick up-to-date. In this case
a low power clock needs to be set up.
### Input parameters
- **none**
### Return values
- **none**
### Allowed from
Internal ThreadX code, application
### Example
ARM assembly
```c
#ifdef TX_LOW_POWER
PUSH {r0-r3}
BL tx_low_power_enter // Enter low power mode
POP {r0-r3}
#endif
#ifdef TX_ENABLE_WFI
DSB // Ensure no outstanding memory transactions
WFI // Wait for interrupt
ISB // Ensure pipeline is flushed
#endif
#ifdef TX_LOW_POWER
PUSH {r0-r3}
BL tx_low_power_exit // Exit low power mode
POP {r0-r3}
#endif
```
### See also
- tx_low_power_exit
---
## tx_low_power_exit
Exit low power mode.
### Prototype
```c
VOID tx_low_power_exit(VOID);
```
### Description
This service exits low power mode.
### Input parameters
- **none**
### Return values
- **none**
### Allowed from
Internal ThreadX code, application
### Example
```c
#ifdef TX_LOW_POWER
PUSH {r0-r3}
BL tx_low_power_enter // Enter low power mode
POP {r0-r3}
#endif
#ifdef TX_ENABLE_WFI
DSB // Ensure no outstanding memory transactions
WFI // Wait for interrupt
ISB // Ensure pipeline is flushed
#endif
#ifdef TX_LOW_POWER
PUSH {r0-r3}
BL tx_low_power_exit // Exit low power mode
POP {r0-r3}
#endif
```
### See also
- tx_low_power_enter
---
## tx_time_increment
This function increments the current time by a specified value. The value was derived by the application by calling the **tx_timer_get_next** function prior to this call, which was right before the processor was put in low power mode.
### Prototype
```c
VOID tx_time_increment(ULONG time_increment);
```
### Description
This function increments the current time by a specified value. The value was derived by the application by calling the **tx_timer_get_next** function prior to this call, which was right before the processor was put in low power mode.
### Input parameters
- **time_increment** Number of ThreadX ticks to increment time and timers.
### Return values
- **none**
### Allowed from
Internal ThreadX code, application
### Example
From **tx_low_power_exit**:
```c
/* Call the low-power timer driver code to obtain the amount of time (in ticks)
the system has been in low power mode. */
#ifdef TX_LOW_POWER_TIMER_ADJUST
tx_low_power_adjust_ticks = TX_LOW_POWER_USER_TIMER_ADJUST;
#else
tx_low_power_adjust_ticks = (ULONG) 0;
#endif
/* Determine if the ThreadX timer needs incrementing. */
if (tx_low_power_adjust_ticks)
{
/* Yes, the ThreadX time must be incremented. */
tx_time_increment(tx_low_power_adjust_ticks);
}
```
### See also
- tx_timer_get_next
---
## tx_timer_get_next
Get next ThreadX timer expiration
### Prototype
```c
ULONG tx_timer_get_next(ULONG *next_timer_tick_ptr);
```
### Description
This service gets the next ThreadX timer expiration, in ticks.
### Input parameters
- **next_timer_tick_ptr** pointer to hold number of ticks
### Return values
- **TX_TRUE** (1) At least one timer is active.
- **TX_FALSE** (0) No timers are currently active.
### Allowed from
Internal ThreadX code, application
### Example
From **tx_low_power_enter**:
```c
ULONG tx_low_power_next_expiration; /* The next timer expiration (units of ThreadX timer ticks). */
ULONG timers_active;
/* At this point, we want to enter low power mode, since nothing
meaningful is going on in the system. However, in order to keep
the ThreadX timer services accurate, we must first determine the
next ThreadX timer expiration in terms of ticks. This is
accomplished via the tx_timer_get_next API. */
timers_active = tx_timer_get_next(&tx_low_power_next_expiration);
```
### See also
- tx_time_increment

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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 */
/** */
/** Low Power Timer Management */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_timer.h"
#include "tx_low_power.h"
/* Define low power global variables. */
/* Flag to determine if we've entered low power mode or not. */
UINT tx_low_power_entered;
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* tx_low_power_enter PORTABLE C */
/* 6.1.5 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the low power entry function. This function is */
/* assumed to be called from the idle loop of tx_thread_schedule. It */
/* is important to note that if an interrupt managed by ThreadX occurs */
/* anywhere where interrupts are enabled in this function, the entire */
/* processing of this function is discarded and the function won't be */
/* re-entered until the idle loop in tx_thread_schedule is executed */
/* again. */
/* */
/* INPUT */
/* */
/* None */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* tx_timer_get_next Get next timer expiration */
/* */
/* CALLED BY */
/* */
/* _tx_thread_schedule Thread scheduling loop */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 03-02-2021 William E. Lamie Initial Version 6.1.5 */
/* */
/**************************************************************************/
VOID tx_low_power_enter(VOID)
{
TX_INTERRUPT_SAVE_AREA
ULONG tx_low_power_next_expiration; /* The next timer experation (units of ThreadX timer ticks). */
ULONG timers_active;
/* Disable interrupts while we prepare for low power mode. */
TX_DISABLE
/* TX_LOW_POWER_TIMER_SETUP is a macro to a routine that sets up a low power
clock. If such routine does not exist, we can skip the logic that computes
the next expiration time. */
#ifdef TX_LOW_POWER_TIMER_SETUP
/* At this point, we want to enter low power mode, since nothing
meaningful is going on in the system. However, in order to keep
the ThreadX timer services accurate, we must first determine the
next ThreadX timer expiration in terms of ticks. This is
accomplished via the tx_timer_get_next API. */
timers_active = tx_timer_get_next(&tx_low_power_next_expiration);
/* There are two possibilities:
1: A ThreadX timer is active. tx_timer_get_next returns TX_TRUE.
Program the hardware timer source such that the next timer
interrupt is equal to: tx_low_power_next_expiration*tick_frequency.
In most applications, the tick_frequency is 10ms, but this is
completely application specific in ThreadX, typically set up
in tx_low_level_initialize. Note that in this situation, a low
power clock must be used in order to wake up the CPU for the next timeout
event. Therefore an alternative clock must be programmed.
2: There are no ThreadX timers active. tx_timer_get_next returns TX_FALSE.
2.a: application may choose not to keep the ThreadX internal
tick count updated (define TX_LOW_POWER_TICKLESS), therefore no need
to set up a low power clock.
2.b: Application still needs to keep ThreadX tick up-to-date. In this case
a low power clock needs to be set up.
*/
#ifndef TX_LOW_POWER_TICKLESS
/* We still want to keep track of time in low power mode. */
if (timers_active == TX_FALSE)
{
/* Set the next expiration to 0xFFFFFFF, an indication that the timer sleeps for
maximum amount of time the HW supports.*/
tx_low_power_next_expiration = 0xFFFFFFFF;
timers_active = TX_TRUE;
}
#endif /* TX_LOW_POWER_TICKLESS */
if (timers_active == TX_TRUE)
{
/* A ThreadX timer is active or we simply want to keep track of time. */
TX_LOW_POWER_TIMER_SETUP(tx_low_power_next_expiration);
}
#endif /* TX_LOW_POWER_TIMER_SETUP */
/* Set the flag indicating that low power has been entered. This
flag is checked in tx_low_power_exit to determine if the logic
used to adjust the ThreadX time is required. */
tx_low_power_entered = TX_TRUE;
/* Re-enable interrupts before low power mode is entered. */
TX_RESTORE
/* User code to enter low power mode. This allows the application to power down
peripherals and put the processor in sleep mode.
*/
#ifdef TX_LOW_POWER_USER_ENTER
TX_LOW_POWER_USER_ENTER;
#endif
/* If the low power code returns, this routine returns to the tx_thread_schedule loop. */
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* tx_low_power_exit PORTABLE C */
/* 6.1.5 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the low power exit function. This function must */
/* be called from any interrupt that can wakeup the processor from */
/* low power mode. If nothing needs to be done, this function simply */
/* returns. */
/* */
/* INPUT */
/* */
/* None */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* tx_time_increment Update the ThreadX timer */
/* */
/* CALLED BY */
/* */
/* ISRs Front-end of Interrupt */
/* Service Routines */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 03-02-2021 William E. Lamie Initial Version 6.1.5 */
/* */
/**************************************************************************/
VOID tx_low_power_exit(VOID)
{
/* How many ticks to adjust ThreadX timers after exiting low power mode. */
ULONG tx_low_power_adjust_ticks;
/* Determine if the interrupt occurred in low power mode. */
if (tx_low_power_entered)
{
/* Yes, low power mode was interrupted. */
/* Clear the low power entered flag. */
tx_low_power_entered = TX_FALSE;
/* User code to exit low power mode and reprogram the
timer to the desired interrupt frequency. */
#ifdef TX_LOW_POWER_USER_EXIT
TX_LOW_POWER_USER_EXIT;
#endif
#ifdef TX_LOW_POWER_USER_TIMER_ADJUST
/* Call the user's low-power timer code to obtain the amount of time (in ticks)
the system has been in low power mode. */
tx_low_power_adjust_ticks = TX_LOW_POWER_USER_TIMER_ADJUST;
#else
tx_low_power_adjust_ticks = (ULONG) 0;
#endif
/* Determine if the ThreadX timer(s) needs incrementing. */
if (tx_low_power_adjust_ticks)
{
/* Yes, the ThreadX timer(s) must be incremented. */
tx_time_increment(tx_low_power_adjust_ticks);
}
}
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* tx_timer_get_next PORTABLE C */
/* 6.1.5 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function calculates the next expiration time minus 1 tick for */
/* the currently active ThreadX timers. If no timer is active, this */
/* routine will return a value of TX_FALSE and the next ticks value */
/* will be set to zero. */
/* */
/* INPUT */
/* */
/* next_timer_tick_ptr Pointer to destination for next */
/* timer expiration value */
/* */
/* OUTPUT */
/* */
/* TX_TRUE (1) At least one timer is active */
/* TX_FALSE (0) No timers are currently active */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* tx_low_power_enter */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 03-02-2021 William E. Lamie Initial Version 6.1.5 */
/* */
/**************************************************************************/
ULONG tx_timer_get_next(ULONG *next_timer_tick_ptr)
{
TX_INTERRUPT_SAVE_AREA
TX_TIMER_INTERNAL **timer_list_head;
TX_TIMER_INTERNAL *next_timer;
UINT i;
ULONG calculated_time;
ULONG expiration_time = (ULONG) 0xFFFFFFFF;
/* Disable interrupts. */
TX_DISABLE
/* Look at the next timer entry. */
timer_list_head = _tx_timer_current_ptr;
/* Loop through the timer list, looking for the first non-NULL
value to signal an active timer. */
for (i = (UINT)0; i < TX_TIMER_ENTRIES; i++)
{
/* Now determine if there is an active timer in this slot. */
if (*timer_list_head)
{
/* Setup the pointer to the expiration list. */
next_timer = *timer_list_head;
/* Loop through the timers active for this relative time slot (determined by i). */
do
{
/* Determine if the remaining time is larger than the list. */
if (next_timer -> tx_timer_internal_remaining_ticks > TX_TIMER_ENTRIES)
{
/* Calculate the expiration time. */
calculated_time = next_timer -> tx_timer_internal_remaining_ticks - (TX_TIMER_ENTRIES - i);
}
else
{
/* Calculate the expiration time, which is simply the number of entries in this case. */
calculated_time = i;
}
/* Determine if a new minimum expiration time is present. */
if (expiration_time > calculated_time)
{
/* Yes, a new minimum expiration time is present - remember it! */
expiration_time = calculated_time;
}
/* Move to the next entry in the timer list. */
next_timer = next_timer -> tx_timer_internal_active_next;
} while (next_timer != *timer_list_head);
}
/* This timer entry is NULL, so just move to the next one. */
timer_list_head++;
/* Check for timer list wrap condition. */
if (timer_list_head >= _tx_timer_list_end)
{
/* Wrap to the beginning of the list. */
timer_list_head = _tx_timer_list_start;
}
}
/* Restore interrupts. */
TX_RESTORE
/* Determine if an active timer was found. */
if (expiration_time != (ULONG) 0xFFFFFFFF)
{
/* Yes, an active timer was found. */
*next_timer_tick_ptr = expiration_time;
return(TX_TRUE);
}
else
{
/* No active timer was found. */
*next_timer_tick_ptr = 0;
return(TX_FALSE);
}
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* tx_time_increment PORTABLE C */
/* 6.1.5 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function increments the current time by a specified value. */
/* The value was derived by the application by calling the */
/* tx_timer_get_next function prior to this call, which was right */
/* before the processor was put in sleep mode. */
/* */
/* INPUT */
/* */
/* time_increment The amount of time to catch up on */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _tx_timer_system_activate Timer activate service */
/* */
/* CALLED BY */
/* */
/* tx_low_power_exit */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 03-02-2021 William E. Lamie Initial Version 6.1.5 */
/* */
/**************************************************************************/
VOID tx_time_increment(ULONG time_increment)
{
TX_INTERRUPT_SAVE_AREA
UINT i;
TX_TIMER_INTERNAL **timer_list_head;
TX_TIMER_INTERNAL *next_timer;
TX_TIMER_INTERNAL *temp_list_head;
/* Determine if there is any time increment. */
if (time_increment == 0)
{
/* Nothing to do, just return. */
return;
}
/* Disable interrupts. */
TX_DISABLE
/* Adjust the system clock. */
_tx_timer_system_clock = _tx_timer_system_clock + time_increment;
/* Adjust the time slice variable. */
if (_tx_timer_time_slice)
{
/* Decrement the time-slice variable. */
if (_tx_timer_time_slice > time_increment)
{
_tx_timer_time_slice = _tx_timer_time_slice - time_increment;
}
else
{
_tx_timer_time_slice = 1;
}
}
/* Calculate the proper place to position the timer. */
timer_list_head = _tx_timer_current_ptr;
/* Setup the temporary list pointer. */
temp_list_head = TX_NULL;
/* Loop to pull all timers off the timer structure and put on the temporary list head. */
for (i = 0; i < TX_TIMER_ENTRIES; i++)
{
/* Determine if there is a timer list in this entry. */
if (*timer_list_head)
{
/* Walk the list and update all the relative times to actual times. */
/* Setup the pointer to the expiration list. */
next_timer = *timer_list_head;
/* Loop through the timers active for this relative time slot (determined by i). */
do
{
/* Determine if the remaining time is larger than the list. */
if (next_timer -> tx_timer_internal_remaining_ticks > TX_TIMER_ENTRIES)
{
/* Calculate the actual expiration time. */
next_timer -> tx_timer_internal_remaining_ticks =
next_timer -> tx_timer_internal_remaining_ticks - (TX_TIMER_ENTRIES - i) + 1;
}
else
{
/* Calculate the expiration time, which is simply the number of entries in this case. */
next_timer -> tx_timer_internal_remaining_ticks = i + 1;
}
/* Move to the next entry in the timer list. */
next_timer = next_timer -> tx_timer_internal_active_next;
} while (next_timer != *timer_list_head);
/* NULL terminate the current timer list. */
((*timer_list_head) -> tx_timer_internal_active_previous) -> tx_timer_internal_active_next = TX_NULL;
/* Yes, determine if the temporary list is NULL. */
if (temp_list_head == TX_NULL)
{
/* First item on the list. Move the entire linked list. */
temp_list_head = *timer_list_head;
}
else
{
/* No, the temp list already has timers on it. Link the next timer list to the end. */
(temp_list_head -> tx_timer_internal_active_previous) -> tx_timer_internal_active_next = *timer_list_head;
/* Now update the previous to the new list's previous timer pointer. */
temp_list_head -> tx_timer_internal_active_previous = (*timer_list_head) -> tx_timer_internal_active_previous;
}
/* Now clear the current timer head pointer. */
*timer_list_head = TX_NULL;
}
/* Move to next timer entry. */
timer_list_head++;
/* Determine if a wrap around condition has occurred. */
if (timer_list_head >= _tx_timer_list_end)
{
/* Wrap from the beginning of the list. */
timer_list_head = _tx_timer_list_start;
}
}
/* Set the current timer pointer to the beginning of the list. */
_tx_timer_current_ptr = _tx_timer_list_start;
/* Loop to update and reinsert all the timers in the list. */
while (temp_list_head)
{
/* Pickup the next timer to update and reinsert. */
next_timer = temp_list_head;
/* Move the temp list head pointer to the next pointer. */
temp_list_head = next_timer -> tx_timer_internal_active_next;
/* Determine if the remaining time is greater than the time increment
value - this is the normal case. */
if (next_timer -> tx_timer_internal_remaining_ticks > time_increment)
{
/* Decrement the elapsed time. */
next_timer -> tx_timer_internal_remaining_ticks = next_timer -> tx_timer_internal_remaining_ticks - time_increment;
}
else
{
/* Simply set the expiration value to expire on the next tick. */
next_timer -> tx_timer_internal_remaining_ticks = 1;
}
/* Now clear the timer list head pointer for the timer activate function to work properly. */
next_timer -> tx_timer_internal_list_head = TX_NULL;
/* Now re-insert the timer into the list. */
_tx_timer_system_activate(next_timer);
}
/* Restore interrupts. */
TX_RESTORE
}

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@@ -0,0 +1,57 @@
/**************************************************************************/
/* */
/* 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 */
/** */
/** Low Power Timer Management */
/** */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/* */
/* COMPONENT DEFINITION RELEASE */
/* */
/* tx_low_power.h PORTABLE C */
/* 6.1.5 */
/* AUTHOR */
/* */
/* William E. Lamie, Express Logic, Inc. */
/* */
/* DESCRIPTION */
/* */
/* This file defines prototypes for the low-power timer additions */
/* required for sleep mode. */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 03-02-2021 William E. Lamie Initial Version 6.1.5 */
/* */
/**************************************************************************/
#ifndef TX_LOW_POWER_H
#define TX_LOW_POWER_H
/* Declare low-power function prototypes. */
VOID tx_low_power_enter(VOID);
VOID tx_low_power_exit(VOID);
VOID tx_time_increment(ULONG time_increment);
ULONG tx_timer_get_next(ULONG *next_timer_tick_ptr);
#endif

22
utility/rtos_compatibility_layers/FreeRTOS/FreeRTOS.h
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@@ -23,7 +23,9 @@
/* DATE NAME DESCRIPTION */
/* */
/* 09-30-2020 William E. Lamie Initial Version 6.1 */
/* */
/* 03-02-2021 Andres Mlinar Modified comment(s), fixed */
/* interrupt macros, */
/* resulting in version 6.1.5 */
/**************************************************************************/
#ifndef FREERTOS_H
@@ -290,11 +292,29 @@ void vPortExitCritical(void);
#endif
#ifndef portDISABLE_INTERRUPTS
#if defined(__IAR_SYSTEMS_ICC__)
#define portDISABLE_INTERRUPTS() __disable_interrupt()
#elif defined(__GNUC__ )
#define portDISABLE_INTERRUPTS() __disable_interrupts()
#elif defined(__ARMCC_VERSION)
#define portDISABLE_INTERRUPTS() __disable_irq()
#else
UINT _tx_thread_interrupt_disable(VOID);
#define portDISABLE_INTERRUPTS() _tx_thread_interrupt_disable()
#endif
#endif
#ifndef portENABLE_INTERRUPTS
#if defined(__IAR_SYSTEMS_ICC__)
#define portENABLE_INTERRUPTS() __enable_interrupt()
#elif defined(__GNUC__ )
#define portENABLE_INTERRUPTS() __enable_interrupts()
#elif defined(__ARMCC_VERSION)
#define portENABLE_INTERRUPTS() __enable_irq()
#else
VOID _tx_thread_interrupt_restore(UINT previous_posture);
#define portENABLE_INTERRUPTS() _tx_thread_interrupt_restore(TX_INT_ENABLE)
#endif
#endif
#define taskENTER_CRITICAL() portENTER_CRITICAL()