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232 lines
8.1 KiB
C
232 lines
8.1 KiB
C
/*
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FreeRTOS V8.1.1 - Copyright (C) 2014 Real Time Engineers Ltd.
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All rights reserved
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that has become a de facto standard. *
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* *
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* Help yourself get started quickly and support the FreeRTOS *
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* project by purchasing a FreeRTOS tutorial book, reference *
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* manual, or both from: http://www.FreeRTOS.org/Documentation *
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* *
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* Thank you! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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>>! NOTE: The modification to the GPL is included to allow you to !<<
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>>! distribute a combined work that includes FreeRTOS without being !<<
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>>! obliged to provide the source code for proprietary components !<<
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>>! outside of the FreeRTOS kernel. !<<
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. Full license text is available from the following
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link: http://www.freertos.org/a00114.html
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1 tab == 4 spaces!
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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong?" *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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license and Real Time Engineers Ltd. contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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compatible FAT file system, and our tiny thread aware UDP/IP stack.
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http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and middleware.
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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engineered and independently SIL3 certified version for use in safety and
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mission critical applications that require provable dependability.
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1 tab == 4 spaces!
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*/
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/* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER.
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NOTE: This driver is primarily to test the scheduler functionality. It does
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not effectively use the buffers or DMA and is therefore not intended to be
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an example of an efficient driver. */
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/* Standard include file. */
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#include <stdlib.h>
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#include <plib.h>
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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "queue.h"
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#include "task.h"
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/* Demo app include files. */
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#include "serial.h"
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/* Hardware setup. */
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#define serSET_FLAG ( 1 )
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/* The queues used to communicate between tasks and ISR's. */
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static QueueHandle_t xRxedChars;
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static QueueHandle_t xCharsForTx;
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/* Flag used to indicate the tx status. */
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static volatile portBASE_TYPE xTxHasEnded;
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/*-----------------------------------------------------------*/
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/* The UART interrupt handler. As this uses the FreeRTOS assembly interrupt
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entry point the IPL setting in the following prototype has no effect. The
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interrupt priority is set by the call to ConfigIntUART2() in
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xSerialPortInitMinimal(). */
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void __attribute__( (interrupt(ipl0), vector(_UART2_VECTOR))) vU2InterruptWrapper( void );
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/*-----------------------------------------------------------*/
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xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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{
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unsigned short usBRG;
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/* Create the queues used by the com test task. */
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xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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/* Configure the UART and interrupts. */
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usBRG = (unsigned short)(( (float)configPERIPHERAL_CLOCK_HZ / ( (float)16 * (float)ulWantedBaud ) ) - (float)0.5);
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OpenUART2( UART_EN, UART_RX_ENABLE | UART_TX_ENABLE | UART_INT_TX | UART_INT_RX_CHAR, usBRG );
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ConfigIntUART2( ( configKERNEL_INTERRUPT_PRIORITY + 1 ) | UART_INT_SUB_PR0 | UART_TX_INT_EN | UART_RX_INT_EN );
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xTxHasEnded = pdTRUE;
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/* Only a single port is implemented so we don't need to return anything. */
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return NULL;
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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{
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/* Only one port is supported. */
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( void ) pxPort;
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/* Get the next character from the buffer. Return false if no characters
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are available or arrive before xBlockTime expires. */
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if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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{
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return pdTRUE;
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}
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else
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{
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return pdFALSE;
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}
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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{
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signed portBASE_TYPE xReturn;
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/* Only one port is supported. */
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( void ) pxPort;
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/* Return false if after the block time there is no room on the Tx queue. */
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if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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{
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xReturn = pdFAIL;
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}
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else
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{
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xReturn = pdPASS;
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}
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if( xReturn != pdFAIL )
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{
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/* A critical section should not be required as xTxHasEnded will not be
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written to by the ISR if it is already 0. */
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if( xTxHasEnded == pdTRUE )
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{
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xTxHasEnded = pdFALSE;
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IFS1SET = _IFS1_U2TXIF_MASK;
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}
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}
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return pdPASS;
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}
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/*-----------------------------------------------------------*/
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void vSerialClose( xComPortHandle xPort )
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{
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}
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/*-----------------------------------------------------------*/
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void vU2InterruptHandler( void )
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{
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/* Declared static to minimise stack use. */
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static char cChar;
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static portBASE_TYPE xHigherPriorityTaskWoken;
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xHigherPriorityTaskWoken = pdFALSE;
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/* Are any Rx interrupts pending? */
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if( IFS1bits.U2RXIF == 1)
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{
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while( U2STAbits.URXDA )
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{
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/* Retrieve the received character and place it in the queue of
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received characters. */
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cChar = U2RXREG;
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xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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}
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IFS1CLR = _IFS1_U2RXIF_MASK;
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}
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/* Are any Tx interrupts pending? */
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if( IFS1bits.U2TXIF == 1 )
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{
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while( ( U2STAbits.UTXBF ) == 0 )
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{
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if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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{
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/* Send the next character queued for Tx. */
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U2TXREG = cChar;
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}
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else
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{
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/* Queue empty, nothing to send. */
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xTxHasEnded = pdTRUE;
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break;
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}
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}
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IFS1CLR = _IFS1_U2TXIF_MASK;
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}
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/* If sending or receiving necessitates a context switch, then switch now. */
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portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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}
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