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117 lines
4.9 KiB
C
117 lines
4.9 KiB
C
/*
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FreeRTOS V7.0.2 - Copyright (C) 2011 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* FreeRTOS tutorial books are available in pdf and paperback. *
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* Complete, revised, and edited pdf reference manuals are also *
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* available. *
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* *
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* Purchasing FreeRTOS documentation will not only help you, by *
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* ensuring you get running as quickly as possible and with an *
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* in-depth knowledge of how to use FreeRTOS, it will also help *
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* the FreeRTOS project to continue with its mission of providing *
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* professional grade, cross platform, de facto standard solutions *
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* for microcontrollers - completely free of charge! *
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* *
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* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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* *
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* Thank you for using FreeRTOS, and thank you for your support! *
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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 obliged to
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provide the source code for proprietary components outside of the FreeRTOS
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kernel. FreeRTOS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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1 tab == 4 spaces!
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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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 xQueueHandle 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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