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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [WizNET_DEMO_GCC_ARM7/] [TCPISR.c] - Blame information for rev 609

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1 585 jeremybenn
/*
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    FreeRTOS V6.1.1 - Copyright (C) 2011 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 books - available as PDF or paperback  *
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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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