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129 lines
5.6 KiB
C
129 lines
5.6 KiB
C
/*
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FreeRTOS V8.0.1 - 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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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "task.h"
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#include "queue.h"
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/* Constants required for interrupt management. */
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#define tcpCLEAR_VIC_INTERRUPT ( 0 )
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#define tcpEINT0_VIC_CHANNEL_BIT ( ( unsigned long ) 0x4000 )
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/* EINT0 interrupt handler. This processes interrupts from the WIZnet device. */
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void vEINT0_ISR_Wrapper( void ) __attribute__((naked));
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/* The handler that goes with the EINT0 wrapper. */
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void vEINT0_ISR_Handler( void );
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/* Variable is required for its address, but does not otherwise get used. */
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static long lDummyVariable;
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/*
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* When the WIZnet device asserts an interrupt we send an (empty) message to
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* the TCP task. This wakes the task so the interrupt can be processed. The
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* source of the interrupt has to be ascertained by the TCP task as this
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* requires an I2C transaction which cannot be performed from this ISR.
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* Note this code predates the introduction of semaphores, a semaphore should
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* be used in place of the empty queue message.
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*/
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void vEINT0_ISR_Handler( void )
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{
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extern QueueHandle_t xTCPISRQueue;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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/* Just wake the TCP task so it knows an ISR has occurred. */
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xQueueSendFromISR( xTCPISRQueue, ( void * ) &lDummyVariable, &xHigherPriorityTaskWoken );
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/* We cannot carry on processing interrupts until the TCP task has
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processed this one - so for now interrupts are disabled. The TCP task will
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re-enable it. */
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VICIntEnClear |= tcpEINT0_VIC_CHANNEL_BIT;
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/* Clear the interrupt bit. */
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VICVectAddr = tcpCLEAR_VIC_INTERRUPT;
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if( xHigherPriorityTaskWoken )
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{
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portYIELD_FROM_ISR();
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}
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}
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/*-----------------------------------------------------------*/
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void vEINT0_ISR_Wrapper( void )
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{
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/* Save the context of the interrupted task. */
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portSAVE_CONTEXT();
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/* The handler must be a separate function from the wrapper to
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ensure the correct stack frame is set up. */
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vEINT0_ISR_Handler();
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/* Restore the context of whichever task is going to run next. */
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portRESTORE_CONTEXT();
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}
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