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117 lines
5.1 KiB
C
117 lines
5.1 KiB
C
/*
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FreeRTOS V6.0.2 - Copyright (C) 2010 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* If you are: *
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* *
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* + New to FreeRTOS, *
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* + Wanting to learn FreeRTOS or multitasking in general quickly *
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* + Looking for basic training, *
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* + Wanting to improve your FreeRTOS skills and productivity *
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* *
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* then take a look at the FreeRTOS eBook *
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* *
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* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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* http://www.FreeRTOS.org/Documentation *
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* *
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* A pdf reference manual is also available. Both are usually delivered *
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* to your inbox within 20 minutes to two hours when purchased between 8am *
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* and 8pm GMT (although please allow up to 24 hours in case of *
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* exceptional circumstances). 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 exception to the GPL is included to allow you to distribute
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a combined work that includes FreeRTOS without being obliged to provide the
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source code for proprietary components outside of the FreeRTOS kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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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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