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/*

    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.

    ***************************************************************************

    *                                                                         *

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    *    + New to FreeRTOS,                                                   *

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    *                                                                         *

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    ***************************************************************************

    This file is part of the FreeRTOS distribution.

    FreeRTOS is free software; you can redistribute it and/or modify it under

    the terms of the GNU General Public License (version 2) as published by the

    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.

    ***NOTE*** The exception to the GPL is included to allow you to distribute

    a combined work that includes FreeRTOS without being obliged to provide the

    source code for proprietary components outside of the FreeRTOS kernel.

    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT

    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

    more details. You should have received a copy of the GNU General Public

    License and the FreeRTOS license exception along with FreeRTOS; if not it

    can be viewed here: http://www.freertos.org/a00114.html and also obtained

    by writing to Richard Barry, contact details for whom are available on the

    FreeRTOS WEB site.

    1 tab == 4 spaces!

    http://www.FreeRTOS.org - Documentation, latest information, license and

    contact details.

    http://www.SafeRTOS.com - A version that is certified for use in safety

    critical systems.

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    licensing and training services.

*/

/* Scheduler include files. */

#include "FreeRTOS.h"

#include "task.h"

#include "queue.h"

/* Constants required for interrupt management. */

#define tcpCLEAR_VIC_INTERRUPT  ( 0 )

#define tcpEINT0_VIC_CHANNEL_BIT        ( ( unsigned long ) 0x4000 )

/* EINT0 interrupt handler.  This processes interrupts from the WIZnet device. */

void vEINT0_ISR_Wrapper( void ) __attribute__((naked));

/* The handler that goes with the EINT0 wrapper. */

void vEINT0_ISR_Handler( void );

/* Variable is required for its address, but does not otherwise get used. */

static long lDummyVariable;

/*

 * When the WIZnet device asserts an interrupt we send an (empty) message to

 * the TCP task.  This wakes the task so the interrupt can be processed.  The

 * source of the interrupt has to be ascertained by the TCP task as this

 * requires an I2C transaction which cannot be performed from this ISR.

 * Note this code predates the introduction of semaphores, a semaphore should

 * be used in place of the empty queue message.

 */

void vEINT0_ISR_Handler( void )

{

extern xQueueHandle xTCPISRQueue;

portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

        /* Just wake the TCP task so it knows an ISR has occurred. */

        xQueueSendFromISR( xTCPISRQueue, ( void * ) &lDummyVariable, &xHigherPriorityTaskWoken );

        /* We cannot carry on processing interrupts until the TCP task has

        processed this one - so for now interrupts are disabled.  The TCP task will

        re-enable it. */

        VICIntEnClear |= tcpEINT0_VIC_CHANNEL_BIT;

        /* Clear the interrupt bit. */

        VICVectAddr = tcpCLEAR_VIC_INTERRUPT;

        if( xHigherPriorityTaskWoken )

        {

                portYIELD_FROM_ISR();

        }

}

/*-----------------------------------------------------------*/

void vEINT0_ISR_Wrapper( void )

{

        /* Save the context of the interrupted task. */

        portSAVE_CONTEXT();

        /* The handler must be a separate function from the wrapper to

        ensure the correct stack frame is set up. */

        vEINT0_ISR_Handler();

        /* Restore the context of whichever task is going to run next. */

        portRESTORE_CONTEXT();

}