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/*

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

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

    *                                                                         *

    * If you are:                                                             *

    *                                                                         *

    *    + New to FreeRTOS,                                                   *

    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *

    *    + Looking for basic training,                                        *

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    *                                                                         *

    * then take a look at the FreeRTOS books - available as PDF or paperback  *

    *                                                                         *

    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *

    *                  http://www.FreeRTOS.org/Documentation                  *

    *                                                                         *

    * A pdf reference manual is also available.  Both are usually delivered   *

    * to your inbox within 20 minutes to two hours when purchased between 8am *

    * and 8pm GMT (although please allow up to 24 hours in case of            *

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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.

    http://www.OpenRTOS.com - Commercial support, development, porting,

    licensing and training services.

*/

#include "FreeRTOS.h"

#include "task.h"

#include "semphr.h"

#include "SAM7_EMAC.h"

#include "AT91SAM7X256.h"

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

/* The semaphore used to signal the arrival of new data to the interface

task. */

static xSemaphoreHandle xSemaphore = NULL;

/* The interrupt entry point is naked so we can control the context saving. */

void vEMACISR_Wrapper( void ) __attribute__((naked));

/* The interrupt handler function must be separate from the entry function

to ensure the correct stack frame is set up. */

void vEMACISR_Handler( void );

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

/*

 * The EMAC ISR.  Handles both Tx and Rx complete interrupts.

 */

void vEMACISR_Handler( void )

{

volatile unsigned long ulIntStatus, ulEventStatus;

portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

extern void vClearEMACTxBuffer( void );

        /* Find the cause of the interrupt. */

        ulIntStatus = AT91C_BASE_EMAC->EMAC_ISR;

        ulEventStatus = AT91C_BASE_EMAC->EMAC_RSR;

        if( ( ulIntStatus & AT91C_EMAC_RCOMP ) || ( ulEventStatus & AT91C_EMAC_REC ) )

        {

                /* A frame has been received, signal the lwIP task so it can process

                the Rx descriptors. */

                xSemaphoreGiveFromISR( xSemaphore, &xHigherPriorityTaskWoken );

                AT91C_BASE_EMAC->EMAC_RSR = AT91C_EMAC_REC;

        }

        if( ulIntStatus & AT91C_EMAC_TCOMP )

        {

                /* A frame has been transmitted.  Mark all the buffers used by the

                frame just transmitted as free again. */

                vClearEMACTxBuffer();

                AT91C_BASE_EMAC->EMAC_TSR = AT91C_EMAC_COMP;

        }

        /* Clear the interrupt. */

        AT91C_BASE_AIC->AIC_EOICR = 0;

        /* If a task was woken by either a frame being received then we may need to

        switch to another task.  If the unblocked task was of higher priority then

        the interrupted task it will then execute immediately that the ISR

        completes. */

        if( xHigherPriorityTaskWoken )

        {

                portYIELD_FROM_ISR();

        }

}

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

void  vEMACISR_Wrapper( void )

{

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

        portSAVE_CONTEXT();

        /* Call the handler to do the work.  This must be a separate

        function to ensure the stack frame is set up correctly. */

        vEMACISR_Handler();

        /* Restore the context of whichever task will execute next. */

        portRESTORE_CONTEXT();

}

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

void vPassEMACSemaphore( xSemaphoreHandle xCreatedSemaphore )

{

        /* Simply store the semaphore that should be used by the ISR. */

        xSemaphore = xCreatedSemaphore;

}